AO Smith Water Heater 197835 001 User Manual

Instruction Manual  
resIdentIal Gas water heaters  
power vent/power dIrect vent Gas Models  
wIth hot surface IGnItIon  
Ashland City, TN 37015  
www.hotwater.com  
for Your safety •  
AN ODORANT IS ADDED TO THE GAS USED  
BY THIS WATER HEATER.  
all technIcal and warrantY questIons: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS  
PURCHASED. IF YOU ARE UNSUCCESSFUL, CALL THE TECHNICAL SUPPORT PHONE NUMBER SHOWN ON THE WATER HEATER LABELING.  
Keep thIs Manual In the pocKet on heater for future reference  
whenever MaIntenance adjustMent or servIce Is requIred.  
PRINTED IN THE U.S.A 1208  
197835-001  
safe InstallatIon, use and servIce  
Your safety and the safety of others is extremely important in the installation, use and servicing of this water heater.  
Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and  
othersof apotentialinjuryhazard. read and obeyallsafetymessagesand instructionsthroughoutthismanual. Itisveryimportant  
that the meaning of each safety message is understood by you and others who install, use or service this water heater.  
all safety messages will generally tell you about the type of hazard, what can happen if you do not follow the safety message and  
how to avoid the risk of injury.  
the california safe drinking water and toxic enforcement act requires the Governor of california to publish a list of substances  
known to the state of california to cause cancer, birth defects, or other reproductive harm, and requires businesses to warn of  
potential exposure to such substances.  
this product contains a chemical known to the state of california to cause cancer, birth defects, or other reproductive harm. this  
appliance can cause low level exposure to some of the substances listed.  
IMportant defInItIons  
Qualified Installer or Service Agency: Installation and service of this water heater requires ability equivalent to that  
of a Qualified Agency (as defined by ANSI below) in the field involved. Installation skills such as plumbing, air supply,  
venting, gas supply, electrical supply are required in addition to electrical testing skills when performing service.  
• ANSI Z223.1 2006 Sec. 3.3.83: “Qualified Agency” - “Any individual, firm, corporation or company that either in person  
or through a representative is engaged in and is responsible for (a) the installation, testing or replacement of gas piping  
or (b) the connection, installation, testing, repair or servicing of appliances and equipment; that is experienced in such  
work; that is familiar with all precautions required; and that has complied with all the requirements of the authority  
having jurisdiction.”.  
• Gas Supplier: The Natural Gas or Propane Utility or service who supplies gas for utilization by the gas burning  
appliances within this application. The gas supplier typically has responsibility for the inspection and code approval of  
gas piping up to and including the Natural Gas meter or Propane storage tank of a building.  
2
General safetY  
3
General safetY  
4
taBle of contents  
SAFE INSTALLATION, USE AND SERVICE............................2  
Installation Sequence......................................................21  
Vertical Vent Terminal Installation ...................................21  
Installation of Vent System, Sidewall ..............................22  
Installation of Vertical Vent System.................................22  
Vent Pipe Preparation.....................................................26  
Controls and Switches....................................................28  
Power Vent Wiring Schematic.........................................29  
LIGHTING & OPERATING LABEL.........................................30  
TEMPERATURE REGULATION ............................................31  
USING THE ELECTRONIC CONTROLLER ..........................32  
FOR YOUR INFORMATION...................................................36  
Start Up Conditions  
Smoke/Odor ............................................................36  
Thermal Expansion .................................................36  
Strange Sounds ......................................................36  
Operational Conditions ...................................................36  
Smelly Water...........................................................36  
“Air” in Hot Water Faucets.......................................36  
PERIODIC MAINTENANCE...................................................37  
Venting System Inspection..............................................37  
Burner Operation and Inspection....................................37  
Burner Cleaning..............................................................37  
Housekeeping.................................................................37  
Anode Rod Inspection.....................................................38  
Temperature-Pressure Relief Valve Operation ...............38  
Draining...........................................................................38  
Service............................................................................39  
LEAKAGE CHECKPOINTS....................................................39  
TROUBLESHOOTING ...........................................................40  
NOTES............................................................................. 41-42  
WARRANTY...........................................................................43  
GENERAL SAFETY..................................................................3  
TABLE OF CONTENTS............................................................5  
INTRODUCTION......................................................................5  
Preparing for the Installation.............................................5  
Get to Know Your Water Heater........................................6  
INSTALLATION CONSIDERATIONS .......................................7  
Rough In Dimensions........................................................7  
Commonwealth of Massachusetts....................................8  
Water Piping - Mixing Valve Usage...................................9  
Facts to Consider About Location...................................10  
Insulation Blankets..........................................................11  
Combustion Air and Ventilation.......................................11  
Appliances in Unconfined Spaces...........................11  
Appliances in Confined Spaces ..............................11  
INSTALLING THE WATER HEATER..................................... 13  
Chemical Vapor Corrosion..............................................13  
Water Piping ...................................................................13  
Temperature-Pressure Relief Valve ................................14  
Gas Piping ......................................................................15  
Sediment Traps...............................................................16  
Filling the Water Heater ..................................................16  
Venting............................................................................16  
Vent Pipe Termination............................................... 16-17  
Planning the Vent System...............................................19  
Condensate.....................................................................19  
Installation of Vent System..............................................20  
Vent Terminal Installation, Sidewall.................................20  
Sequence of Installations, Figure 18A ............................20  
Direct Venting..................................................................20  
Direct Vent Terminal Installation......................................20  
IntroductIon  
thank You for purchasing this water heater. Properly installed and  
maintained, it should give you years of trouble free service.  
2. The installation must conform with these instructions and the  
local code authority having jurisdiction. In the absence of local  
codes, the installation must comply with the current editions of the  
National Fuel Gas Code, ANSI Z223.1/NFPA 54 and the National  
Electrical Code, NFPA70 or CAN/CSA-B149.1, the Natural Gas and  
Propane Installation Code and CSA C22.1, the Canadian Electrical  
Code. All documents are available from the Canadian Standards  
Association, 8501EastPleasantValleyRoad, Cleveland, OH44131.  
NFPAdocuments are also available from the National Fire Protection  
Association, 1 Batterymarch Park, Quincy, MA 02269.  
Abbreviations Found In This Instruction Manual:  
• CSA - Canadian Standards Association  
• ANSI - American National Standards Institute  
• NFPA - National Fire Protection Association  
• ASME - American Society of Mechanical Engineers  
• GAMA - Gas Appliance Manufacturer’s Association  
• UL - Underwriters Laboratories Inc.  
3. The water heater when installed must be grounded in accordance  
with the local codes, or in the absence of local codes: the National  
Electrical Code (NFPA 70) or the Canadian Electrical Code (C22.1).  
This gas-fired water heater is design certified by Underwriters  
Laboratories Inc. under American National Standard/CSA Standard  
for Gas Water Heaters ANSI Z21.10.3 • CSA 4.3 (current edition).  
4. If after reading this manual you have any questions or do not  
understand any portion of the instructions, call the local gas utility  
or the manufacturer whose name appears on the rating plate.  
5. Carefully plan the place where you are going to put the water  
heater. Correct combustion, vent action, and vent pipe installation  
are very important in preventing death from possible carbon  
monoxide poisoning and fires, see Figures 1 and 2.  
preparInG for the InstallatIon  
1. Read the “General Safety” section, page 3 and 4 of this manual  
first and then the entire manual carefully. If you don’t follow the  
safety rules, the water heater will not operate properly. It could  
cause DEATH, SERIOUS BODILY INJURY AND/OR PROPERTY  
DAMAGE.  
Examine the location to ensure the water heater complies with  
the “Facts to Consider About Location” section in this manual.  
6. For California installation this water heater must be braced,  
anchored, or strapped to avoid falling or moving during an  
earthquake. See instructions for correct installation procedures.  
Instructions may be obtained from California Office of the State  
Architect, 400 P Street, Sacramento, CA 95814.  
This manual contains instructions for the installation, operation,  
and maintenance of the gas-fired water heater. It also contains  
warnings throughout the manual that you must read and be  
aware of. All warnings and all instructions are essential to the  
proper operation of the water heater and your safety. Since we  
cannot put everything on the first few pages, read the entIre  
Manual Before atteMptInG to Install or operate  
the water heater.  
7. Massachusetts Code requires this water heater to be installed in  
accordance with Massachusetts 248-CMR 2.00: State Plumbing  
Code and 248-CMR 5.00, See page 8.  
8. Complies with SCAQMD rule #1146 and districts having equivalent  
NOx requirements.  
5
Get to Know Your water heater - Gas Models  
a
B
c
d
e
f
G
h
I
control assembly  
Blocked Inlet switch  
Blocked outlet switch  
fan prover switch  
Blower assembly  
Burner assembly  
flame sensor  
hot surface Igniter  
junction Box  
Gas control valve thermostat  
display Board  
top plastic enclosure  
Y
Z
Inlet dip tube  
T/P Relief Valve  
M
display enclosure  
**n exhaust elbow assembly  
**o condensate tubing  
aa rating plate  
BB labels  
cc drain valve  
**dd vent terminal  
ee Metal drain pan  
ff anode  
GG Insulation  
hh upper temperature probe  
II  
p
q
r
off/on switch  
display label  
hot water outlet  
*S Electrical Outlet (120VAC)  
t
u
v
w
X
Gas supply  
Main Manual Gas shutoff valve  
union  
Inlet water shutoff valve  
cold water Inlet  
j
K
l
access door  
replaceMent parts and delIMInG products  
Replacement parts and recommended delimer may be ordered through  
authorized servicers or distributors. When ordering parts, provide complete  
model and serial numbers (see rating plate), quantity and name of part  
desired. Standard hardware items may be purchased locally.  
access panel  
caution: This access panel covers  
a 2” NPT plug that was required  
during the manufacturing of this  
water heater. This 2” NPT flange is  
not a cleanout fitting, removing the  
2” NPT plug and using this fitting as a  
cleanout could void your warranty.  
vacuuM relIef  
valve  
*Install per  
local codes  
* CAUTION HARNESS HAS 120 VAC. IN OPERATION.  
** see “planning the vent system,” “Installation of vent system” and condensatefor more information.  
FIGURE 1.  
6
InstallatIon consIderatIons  
rouGh In dIMensIons  
FIGURE 1A.  
rough-In-dimensions  
Model Units  
Inches 68.50 49.25 22.00 15.75  
cm 174 125.09 55.88 40.00  
A
B
C
D
E
F
3.00  
7.62  
8.00  
100  
20.32  
Top/Side Inlet and Outlet: 3/4” NPT  
Gas Inlet: 1/2” NPT  
capacity, Gas and electrical characteristics  
Approximate Capacity  
Manifold Pressure  
Liters Gas Type “WC kPA  
189 Nat./LP 0” 0”  
Electrical Characteristics  
Model  
100  
U.S. Gals.  
50  
Volts/Hz  
120/60  
Amperes  
<5  
All models - Maximum Supply Pressure: 14 inches W.C. (3.48kPa)  
Minimum Supply Pressure for Natural Gas: 3.50” (.87kPa)  
Minimum Supply Pressure for Propane Gas: 8.00” (1.99kPa)  
Minimum pressure must be maintained under both load and no load (dynamic and static) conditions.  
recovery capacities - u.s. Gallons/hr. and liters/hr. at temperature rise Indicated  
Input  
Recovery Capacities  
Model  
100  
F
30  
17  
40  
22  
50  
28  
60  
33  
70  
39  
80  
44  
90  
50  
100  
56  
110  
61  
120  
67  
130  
72  
140  
78  
Rating  
Rating  
(kW)  
Temp.  
(Btu/hr)  
Rise  
C
GPH  
LPH  
387  
291  
233  
882  
194  
734  
166  
628  
145  
549  
129  
488  
116  
439  
106  
401  
97  
90  
83  
100,000  
29.3  
1465 1102  
367  
341  
314  
Recovery capacity based on 96% thermal efficiency  
7
InstallatIon requIreMents for the coMMonwealth of Massachusetts  
For all side wall terminated, horizontally vented power vent, direct vent, and power direct vent gas fueled water heaters  
installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned  
or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above  
finished grade in the area of the venting, including but not limited to decks and porches, the following requirements  
shall be satisfied:  
InstallatIon of carBon MonoXIde detectors At the time of installation of the side wall horizontal vented gas fueled  
equipment, the installing plumber or gasfitter shall observe that a hard wired carbon monoxide detector with an alarm and battery back-up  
is installed on the floor level where the gas equipment is to be installed. In addition, the installing plumber or gasfitter shall observe that  
a battery operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling, building  
or structure served by the sidewall horizontal vented gas fueled equipment. It shall be the responsibility of the property owner to secure  
the services of qualified licensed professionals for the installation of hard wired carbon monoxide detectors.  
In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the hard  
wired carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent floor level.  
In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner shall  
have a period of thirty (30) days to comply with the above requirements provided that during said thirty (30) day period, a  
battery operated carbon monoxide detector with an alarm shall be installed.  
approved carBon MonoXIde detectors Each carbon monoxide detector as required in accordance with the  
above provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and CSA certified.  
sIGnaGe A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum  
height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled  
heating appliance or equipment. The sign shall read, in print size no less than one-half (1/2) inch in size, “Gas vent  
dIrectlY Below. Keep clear of all oBstructIons.”  
InspectIon The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the  
installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance  
with the provisions of 248 CMR 5.08(2)(a) 1 through 4.  
eXeMptIons: The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4:  
1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current edition of NFPA  
54 as adopted by the Board; and  
2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from the  
dwelling, building, or structure used in whole or in part for residential purposes.  
Manufacturer requIreMents - Gas equIpMent ventInG sYsteM provIded When the manufacturer of Product  
Approved side wall horizontally vented gas equipment provides a venting system design or venting system components with the  
equipment, the instructions provided by the manufacturer for installation of the equipment and the venting system shall include:  
1. Detailed instructions for the installation of the venting system design or the venting system components; and  
2. A complete parts list for the venting system design or venting system.  
Manufacturer requIreMents - Gas equIpMent ventInG sYsteM not provIded When the manufacturer  
of a Product Approved side wall horizontally vented gas fueled equipment does not provide the parts for venting the flue  
gases, but identifies “special venting systems,” the following requirements shall be satisfied by the manufacturer:  
1. The referenced “special venting system” instructions shall be included with the appliance or equipment installation instructions; and  
2. The “special venting systems” shall be Product Approved by the Board, and the instructions for that system shall include  
a parts list and detailed installation instructions.  
A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equipment, all venting  
instructions, all parts lists for venting instructions, and/or all venting design instructions shall remain with the appliance or  
equipment at the completion of the installation.  
8
water pIpInG - MIXInG valve usaGe  
* the side recirculation loop connections may not be used as the primary water inlet and outlet connections. for your convenience, plugs are installed  
in these fittings at the factory. Remove these plugs if needed for your specific installation. Otherwise (as with all connections) check for leaks while  
filling the tank with water and after completing the installation.  
FIGURE 2.  
This appliance has been design certified as complying with  
American National Standard/CSA Standard for water heaters and  
is considered suitable for:  
HOTTER WATER CAN SCALD:  
Water heaters are intended to produce hot water. Water heated  
to a temperature which will satisfy space heating, clothes  
washing, dish washing, and other sanitizing needs can scald  
and permanently injure you upon contact. Some people are more  
likely to be permanently injured by hot water than others. These  
include the elderly, children, and the physically or developmentally  
disabled. If anyone using hot water from this heater fits into one  
of these groups or if there is a local code or state law requiring  
a certain temperature water at the hot water tap, then you must  
take special precautions. In addition to using the lowest possible  
temperature setting that satisfies your hot water needs, a means  
such as a Mixing Valve, should be used at the hot water taps  
used by these people or at the water heater, see Figure 2. Mixing  
valves are available at plumbing supply or hardware stores.  
Consult a Qualified Installer or Service Agency. Follow mixing  
valve manufacturer’s instructions for installation of the valves.  
Before changing the factory setting on the thermostat, read the  
Temperature Regulation” section in this manual.  
Water (Potable) Heating and Space Heating: All models are  
considered suitable for water (potable) heating and space heating.  
9
facts to consIder aBout the locatIon  
Carefully choose an indoor location for the new water heater, because  
the placement is a very important consideration for the safety of the  
occupants in the building and for the most economical use of the  
appliance. this water heater is not for use in manufactured  
(mobile) homes or outdoor installation.  
Whether replacing an old water heater or putting the water heater in  
a new location, the following critical points must be observed:  
1. Select a location indoors as close as practical to the vent terminal or  
locationtowhichthewaterheaterventpipingisgoingtobeconnected,  
and as centralized with the water piping system as possible.  
2. Selected location must provide adequate clearances for servicing  
and proper operation of the water heater.  
Installation of the water heater must be accomplished in such a manner  
that if the tank or any connections should leak, the flow will not cause  
damage to the structure. For this reason, it is not advisable to install  
the water heater in an attic or upper floor. When such locations cannot  
be avoided, a suitable metal drain pan should be installed under the  
water heater. Drain pans are available at your local hardware store.  
Such a drain pan must have a clearance of at least 1.0” (2.5cm)  
greater than any point on the water heater’s outer jacket and must  
be piped to an adequate drain. The pan must not restrict combustion  
air flow. For example, if a circular pan is used, it must be a minimum  
of 27” (69cm) in diameter. See Figure 1.  
Water heater life depends upon water quality, water pressure and  
the environment in which the water heater is installed. Water heaters  
are sometimes installed in locations where leakage may result in  
property damage, even with the use of a drain pan piped to a drain.  
However, unanticipated damage can be reduced or prevented by  
a leak detector or water shut-off device used in conjunction with a  
piped drain pan. These devices are available from some plumbing  
supply wholesalers and retailers, and detect and react to leakage  
in various ways:  
• Sensors mounted in the drain pan that trigger an alarm or turn off the  
incoming water to the water heater when leakage is detected.  
• Sensors mounted in the drain pan that turn off the water supply to  
the entire building when water is detected in the drain pan.  
• Water supply shut-off devices that activate based on the water  
pressure differential between the cold water and hot water pipes  
connected to the water heater.  
• Devices that will turn off the gas supply to a gas water heater while  
at the same time shutting off its water supply.  
INSTALLATIONS IN AREAS WHERE FLAMMABLE LIQUIDS  
(VAPORS) ARE LIKELY TO BE PRESENT OR STORED  
(GARAGES, STORAGE AND UTILITY AREAS, ETC.): Flammable  
liquids (such as gasoline, solvents, propane (LP or butane, etc.) and  
other substances (such as adhesives, etc.) emit flammable vapors  
which can be ignited by a gas water heater’s hot surface igniter or  
main burner. The resulting flashback and fire can cause death or  
serious burns to anyone in the area.  
This water heater must not be installed directly on carpeting.  
Carpeting must be protected by metal or wood panel beneath the  
appliance extending beyond the full width and depth of the appliance  
by at least 3” (7.6 cm) in any direction, or if the appliance is installed  
Also, the water heater must be located and/or protected so it is not  
subject to physical damage by a moving vehicle.  
10  
in an alcove or closet, the entire floor must be covered by the panel.  
Failure to heed this warning may result in a fire hazard.  
for placement on the blanket directly over the existing labels.  
Do inspect the insulation blanket frequently to make certain it  
does not sag, thereby obstructing combustion air flow.  
coMBustIon aIr and ventIlatIon  
Agas water heater cannot operate properly without the correct amount  
of air for combustion. Do not install in a confined area such as a closet,  
unless you provide air as shown in the “Facts to Consider About  
Location” section. Never obstruct the flow of ventilation air. If you have  
any doubts or questions at all, call your gas supplier. Failure to provide  
the proper amount of combustion air can result in a fire or explosion  
and cause death, serious bodily injury, or property damage.  
Minimum clearances between the water heater and combustible  
construction are 0 inch at the sides and rear, 5.5” (14.0 cm) from the front  
and 12” (30.5 cm) from the top. (Standard clearance.) If clearances  
stated on the heater differ from standard clearances, install water  
heater according to clearances stated on the heater.  
Adequate clearance 24” (61.0 cm) for servicing this appliance should be  
considered before installation, such as changing the anodes, etc.  
A minimum clearance of 5.5” (14.0 cm) must be allowed for access to  
replaceable parts such as the thermostats, drain valve and relief valve.  
When installing the heater, consideration must be given to proper  
location. Location selected should be as close to the wall as practicable  
and as centralized with the water piping system as possible.  
FIGURE 4.  
InsulatIon BlanKets  
FIGURE 5.  
Insulation blankets are available to the general public for external use  
on gas water heaters but are not necessary with these products. The  
purpose of an insulation blanket is to reduce the standby heat loss  
encountered with storage tank heaters. Your water heater meets or  
exceeds the Energy Policy Act standards with respect to insulation and  
standby loss requirements, making an insulation blanket unnecessary.  
If this water heater will be used in beauty shops, barber shops, cleaning  
establishments, or self-service laundries with dry cleaning equipment,  
it is imperative that the water heater (s) be installed direct vent so that  
all air for combustion and ventilation is taken from outdoors.  
Propellants of aerosol sprays and volatile compounds, (cleaners,  
chlorine based chemicals, refrigerants, etc.) in addition to being highly  
flammable in many cases, will also react to form corrosive hydrochloric  
acid when exposed to the combustion products of the water heater.  
The results can be hazardous, and also cause product failure.  
Should you choose to apply an insulation blanket to this heater, you  
should follow these instructions (For identification of components  
mentioned below, see Figure 1). Failure to follow these instructions  
can restrict the air flow required for proper combustion, potentially  
resulting in fire, asphyxiation, serious personal injury or death.  
applIances In unconfIned spaces  
unconfIned space is space whose volume is not less than  
50 cubic feet per 1,000 Btu per hour (4.8 cubic meters per kW) of the  
aggregate input rating of all appliances installed in that space. Rooms  
communicating directly with the space in which the appliances are  
installed, through openings not furnished with doors, are considered  
a part of the unconfined space.  
In unconfined spaces in buildings, infiltration may be adequate to  
provide air for combustion, ventilation and dilution of flue gases.  
However, in buildings of tight construction (for example, weather  
stripping, heavily insulated, caulked, vapor barrier, etc.), additional air  
may need to be provided using the methods described in “Appliances  
in Confined Space” that follows.”  
applIances In confIned spaces  
Do not apply insulation to the top of the water heater, as this will  
interfere with safe operation of the blower assembly.  
Do not cover the outer door, thermostat or temperature & pressure  
relief valve.  
confIned space is a space whose volume is less than 50 cubic  
feet per 1,000 Btu per hour (4.8 cm per kW) of the aggregate input  
rating of all appliances installed in that space.  
When drawing combustion air from inside a conventionally constructed  
building to a confined space, such a space should be provided  
with two permanent openings. ONE WITHIN 12 INCHES (30 cm)  
OF THE ENCLOSURE TOP AND ONE WITHIN 12 INCHES (30  
cm) OF THE ENCLOSURE BOTTOM. Each opening should have  
Do not allow insulation to come within 2” (5.1 cm) of the floor to  
prevent blockage of combustion air flow to the burner.  
Do not cover the instruction manual. Keep it on the side of the  
water heater or nearby for future reference.  
Do obtain new warning and instruction labels from the manufacturer  
11  
a free area of one square inch per 1000 Btu/hr (22 cm2/kW) of the  
total input of all appliances in the enclosure, but not less than 100  
square inches (645 cm2).  
enclosure, see Figure 9.  
If the confined space is within a building of tight construction, air for  
combustion and ventilation must be obtained from outdoors. When  
directly communicating with the outdoors or communicating through  
vertical ducts, two permanent openings, located in the above manner,  
should be provided. Each opening should have a free area of not less  
than one square inch per 4000 Btu/hr (5.5 cm2/kW) of total input of all  
appliances in the enclosure. If horizontal ducts are used, each opening  
should have a free area of not less than one square inch per 2000 Btu/  
hr (11cm2/kW) of the total input of all appliances in the enclosure.  
a. all aIr froM InsIde BuIldInGs: (See Figure 5 and 6)  
The confined space should be provided with two permanent openings  
communicating directly with an additional room(s) of sufficient volume  
so that the combined volume of all spaces meets the criteria for an  
unconfined space. The total input of all gas utilization equipment installed  
in the combined space should be considered in making this determination.  
Each opening should have a minimum free area of one square inch  
per 1,000 Btu per hour (22 cm2/kW) of the total input rating of all gas  
utilization equipment in the confined space, but not less than 100 square  
inches (645 cm2). One opening should commence within 12 inches  
(30 cm) of the top and one commencing within 12 inches (30 cm) of the  
bottom of the enclosures.  
FIGURE 8.  
4. When ducts are used, they should be of the same cross-sectional area  
as the free area of the openings to which they connect. The minimum  
short side dimension of rectangular air ducts should not be less than  
3 inches (7.6 cm), see Figure 9.  
FIGURE 9.  
FIGURE 6.  
5. Alternatively a single permanent opening may be used when  
communicating directly with the outdoors, or with spaces that freely  
communicatewiththeoutdoors.Theopeningshould haveaminimum  
freeareaof1squareinchper3,000BTUperhour(8.3cm2/kW)oftotal  
input rating of all equipment in enclosure. See Figure 9A.  
B. all aIr froM outdoors: (See Figures 7, 8 and 9)  
The confined space should be provided with two permanent  
openings, one commencing within 12 inches (30 cm) of the top and  
one commencing within 12 inches (30 cm) from the bottom of the  
enclosure. The openings should communicate directly, or by ducts,  
with the outdoors or spaces (crawl or attic) that freely communicate  
with the outdoors.  
1. When directly communicating with the outdoors, each opening should  
have a minimum free area of 1 square inch per 4,000 Btu per hour (5.5 cm2/  
kW) of total input rating of all equipment in the enclosure, see Figure 7.  
FIGURE 9.  
6. Louvers and Grilles: In calculating free area, consideration should be  
given to the blocking effect of louvers, grilles or screens protecting openings.  
Screens used should not be smaller than 1/4 inch (6.4 mm) mesh. If the free  
areathroughadesignoflouverorgrilleisknown,itshouldbeusedincalculating  
the size opening required to provide the free area specified. If the design and  
free area is not known, it may be assumed that wood louvers will be 20-25  
percent free area and metal louvers and grilles will have 60-75 percent free  
area.Louversandgrillesshould bexedintheopenpositionorinterlockedwith  
the equipment so that they are opened automatically during equipment  
operation.  
FIGURE 7.  
2. When communicating with the outdoors through vertical ducts, each  
opening should have a minimum free area of 1 square inch per 4,000  
Btu per hour (5.5 cm2/kW) of total input rating of all equipment in the  
enclosure, see Figure 8.  
7. SpecialConditionsCreatedbyMechanicalExhaustingorFireplaces:  
operation of exhaust fans, ventilation systems, clothes dryers or  
fireplaces may create conditions requiring special attention to avoid  
unsatisfactory operation of installed gas utilization equipment.  
3. Whencommunicatingwiththeoutdoorsthroughhorizontalducts,each  
opening should have a minimum free area of 1 square inch per 2,000  
Btu per hour (11 cm2/kW)) of total input rating of all equipment in the  
12  
InstallInG the new water heater  
closed water sYsteMs  
cheMIcal vapor corrosIon  
Water supply systems may, because of code requirements or such  
CORROSION OF THE FLUEWAYS AND VENT SYSTEM MAY OCCUR IF  
AIRFORCOMBUSTIONCONTAINSCERTAINCHEMICALVAPORS.SUCH conditions as high line pressure, among others, have installed devices  
CORROSION MAY RESULT IN FAILURE AND RISK OF ASPHYXIATION.  
such as pressure reducing valves, check valves, and back flow preventers.  
Devices such as these cause the water system to be a closed system.  
Spray can propellants, cleaning solvents, refrigerator and air  
conditioning refrigerants, swimming pool chemicals, calcium and  
sodium chloride (water softener salt), waxes, and process chemicals  
are typical compounds which are potentially corrosive.  
therMal eXpansIon  
As water is heated, it expands (thermal expansion). In a closed system  
the volume of water will grow when it is heated. As the volume of water  
grows there will be a corresponding increase in water pressure due  
to thermal expansion. Thermal expansion can cause premature tank  
failure (leakage). This type of failure is not covered under the limited  
warranty. Thermal expansion can also cause intermittent temperature-  
pressure relief valve operation: water discharged from the valve due to  
excessive pressure build up. The temperature-pressure relief valve is  
not intended for the constant relief of thermal expansion. This condition  
is not covered under the limited warranty.  
Do not store products of this sort near the heater. Also, air which is  
brought in contact with the heater should not contain any of these  
chemicals. If necessary, uncontaminated air should be obtained from  
remote or outside sources. The limited warranty is voided when failure  
of water heater is due to a corrosive atmosphere. (See limited warranty  
for complete terms and conditions).  
water pIpInG  
A properly sized thermal expansion tank should be installed  
on all closed systems to control the harmful effects of thermal  
expansion..  
HOTTER WATER CAN SCALD:  
Water heaters are intended to produce hot water. Water heated to a  
temperature which will satisfy space heating, clothes washing, dish  
washing, cleaning and other sanitizing needs can scald and permanently  
injure you upon contact. Some people are more likely to be permanently  
injured by hot water than others. These include the elderly, children, the  
physically or developmentally disabled. If anyone using hot water fits into  
one of these groups or if there is a local code or state law requiring a  
certain temperature water at the hot water tap, then you must take special  
precautions. In addition to using the lowest possible temperature setting  
that satisfies your hot water needs, a means such as a *mixing valve,  
should be used at the hot water taps used by these people or at the water  
heater, see Figure 2. Valves for reducing point of use temperature by  
mixing cold and hot water are also available:  
Consult a Qualified Installer or Service Agency. Follow manufacturer’s  
instructions for installation of the valves. Before changing the factory  
setting on the thermostat, read the “Temperature Regulation” section in  
this manual.  
This water heater should not be connected to any heating systems or  
component(s) used with a non-potable water heating appliance.  
All piping components connected to this unit for space heating  
applications should be suitable for use with potable water.  
FIGURE 10.  
Toxic chemicals, such as those used for boiler treatment should not be  
introduced into this system.  
note: to protect against untimely corrosion of hot and cold  
water fittings, it is strongly recommended that di-electric unions  
or couplings be installed on this water heater when connected  
to copper pipe, see Figure 2 also.  
When the system requires water for space heating at temperatures  
higher than required for domestic water purposes, a mixing valve must be  
installed. Please refer to Figure 2 for suggested piping arrangement.  
13  
Figures 2 and 10 show the typical attachment of the water piping to If replaced, the valve must meet the requirements of local codes, but  
the water heater. The water heater is equipped with 3/4 inch NPT not less than a combination temperature and pressure relief valve  
water connections.  
certified as indicated in the above paragraph.  
The valve must be marked with a maximum set pressure not to  
exceed the marked hydrostatic working pressure of the water heater  
(150 psi = 1,035 kPa) and a discharge capacity not less than the  
water heater Btu/hr input rate as shown on the water heater’s  
model rating plate.  
note: If using copper tubing, solder tubing to an adapter  
before attaching the adapter to the water heater connections.  
do not solder the water lines directly to the water heater  
connections. It will harm the dip tube and damage the  
tank.  
For safe operation of the water heater, the relief valve must not be  
removed from its designated opening nor plugged.  
T & P Valve and Pipe Insulation (if supplied)  
Remove insulation for T & P valve and pipe connections from  
carton.  
The temperature-pressure relief valve must be installed directly into  
the fitting of the water heater designed for the relief valve. Position  
the valve downward and provide tubing so that any discharge will  
exit only within 6 inches (15.2 cm) above, or at any distance below  
the structural floor. Be certain that no contact is made with any live  
electrical part. The discharge opening must not be blocked or reduced  
in size under any circumstances. Excessive length, over 30 feet (9.14  
m), or use of more than four elbows can cause restriction and reduce  
the discharge capacity of the valve, see Figures 10.  
No valve or other obstruction is to be placed between the relief  
valve and the tank. Do not connect tubing directly to discharge  
drain unless a 6” (15.2 cm) air gap is provided. To prevent bodily  
injury, hazard to life, or property damage, the relief valve must  
be allowed to discharge water in quantities should circumstances  
demand. If the discharge pipe is not connected to a drain or other  
suitable means, the water flow may cause property damage.  
FIGURE 11.  
Fit pipe insulation over the incoming cold water line and the  
hot water line. Make sure that the insulation is against the top  
cover of the heater.Fit T & P valve insulation over valve. Make  
sure that the insulation does not interfere with the lever of the  
T & P valve.  
Secure all insulation using tape.  
teMperature-pressure relIef valve  
The Discharge Pipe:  
• Should not be smallerin size than the outlet pipe size of the valve, or  
have any reducing couplings or other restrictions.  
• Should not be plugged or blocked.  
• Should be of material listed for hot water distribution.  
• Should be installed so as to allow complete drainage of both the  
temperature-pressure relief valve, and the discharge pipe.  
• Should terminate at an adequate drain.  
• Should not have any valve between the relief valve and  
tank.  
This heater is provided with a properly certified combination  
temperature - pressure relief valve by the manufacturer.  
The valve is certified by a nationally recognized testing laboratory  
that maintains periodic inspection of production of listed equipment of  
materials as meeting the requirements for Relief Valves for Hot Water  
Supply Systems, ANSI Z21.22 • CSA 4.4, and the code requirements  
of ASME.  
14  
The temperature-pressure relief valve must be manually  
operated at least once a year , see Figure 28. Caution should be  
taken to ensure that (1) no one is in front of or around the outlet  
of the temperature-pressure relief valve discharge line, and (2)  
the water manually discharged will not cause any bodily injury  
or property damage because the water may be extremely hot.  
hIGh altItude InstallatIons  
If after manually operating the valve, it fails to completely reset  
and continues to release water, immediately close the cold water  
inlet to the water heater, follow the draining instructions, and  
replace the temperature-pressure relief valve with a new one.  
Gas pIpInG  
Rated inputs are suitable up to 10,100 feet (3,079m) elevation. Consult  
the factory for installation at altitudes over 10,100 feet (3,079m).  
WARNING: THIS HIGH EFFICIENCY WATER HEATER IS CERTIFIED  
FOR USE WITHOUT MODIFICATION FOR AN ALTITUDE OF 10,100  
FEET (3,079 METERS). INSTALLATIONS ABOVE THESE ALTITUDES  
MAY REQUIRE REPLACEMENT OF BURNER ORIFICE. CALL THE  
TECHNICAL CENTER AT (800) 527-1953 FOR REQUIREMENTS.  
Make sure gas supplied is same type listed on model rating plate. The  
inlet gas pressure must not exceed 14 inch water column (3.5 kPa)  
for natural and propane gas (L.P.). The minimum inlet gas pressure  
shown on rating plate is that which will permit firing at rated input.  
Some gas utility companies derate their gas for altitude, making  
it unnecessary to install high altitude orifices. Call the local gas or  
utility company to verify BTU content.  
All gas piping must comply with local codes and ordinances or with the  
National Fuel Gas Code (ANSI Z223.1/ NFPA-54) or the Natural  
Gas and Propane Installation Code (CAN/CSA B149.1) whichever  
applies. Copper or brass tubing and fittings (except tin lined copper  
tubing) should not be used.  
Due to the input ration reduction at high altitudes, the output rating  
of the appliance is also reduced and should be compensated for in  
the sizing of the equipment for applications.  
If the gas control valve is subjected to pressures exceeding 1/2 psi  
(3.5 kPa), the damage to the gas control valve could result in a fire  
or explosion from leaking gas.  
If the main gas line Shut-off serving all gas appliances is used, also  
turn “off” the gas at each appliance. Leave all gas appliances shut  
“off” until the water heater installation is complete.  
A gas line of sufficient size must be run to the water heater.  
Consult the current edition of National Fuel Gas Code  
(ANSI Z223.1/NFPA54) or the Natural Gas and Propane Installation  
Code (CAN/CSA B149.1) and your gas supplier concerning pipe  
size.  
Use pipe joint compound or teflon tape marked as being resistant  
to the action of petroleum [Propane (L.P.)] gases.  
There must be:  
The appliance and its gas connection must be leak tested before  
placing the appliance in operation.  
• A readily accessible manual shut off valve in the gas supply  
line serving the water heater, and  
The appliance and its individual Shut-off valve should be disconnected  
from the gas supply piping system during any pressure testing of  
that system at test pressures in excess of 1/2 pound per square inch  
(3.5 kPa). It should be isolated from the gas supply piping system  
by closing its individual manual Shut-off valve during any pressure  
testing of the gas supply piping system at test pressures equal to  
or less than 1/2 pound per square inch (3.5 kPa).  
• A drip leg (sediment trap) ahead of the gas control valve to help  
prevent dirt and foreign materials from entering the gas control  
valve.  
• A flexible gas connector or a ground joint union between the  
shut off valve and control valve to permit servicing of the  
unit.  
Be sure to check all the gas piping for leaks before lighting the  
water heater. Use a soapy water solution, not a match or open  
flame. Rinse off soapy solution and wipe dry.  
IMportant: MaKe sure the Gas lIne Is pIped In wIth  
hard pIpe. avoId fleX lIne constructIon for Gas due  
to possIBle Gas flow proBleMs.  
15  
sedIMent traps  
ventInG  
Asediment trap should be installed as close to the gas inlet of the water  
heater as practical at the time of water heater installation. The sediment  
trap should be either a tee fitting with a capped nipple in the bottom  
outlet or other device recognized as an effective sediment trap.  
Contaminants in the gas lines may cause improper operation of the  
gas control valve that may result in fire or explosion. Before attaching  
the gas line be sure that all gas pipe is clean on the inside. To trap any  
dirt or foreign material in the gas supply line, a drip leg (sometimes  
called a sediment trap) must be incorporated in the piping. The drip  
leg must be readily accessible. Install in accordance with the “Gas  
Piping” section. Refer to the current edition of the National Fuel  
Gas Code (ANSI Z223.1/NFPA 54) or the Natural Gas and Propane  
Installation Code (CAN/CSA B149.1).  
vent pIpe terMInatIon  
fIllInG the water heater  
The first step is to determine where the vent pipe will terminate.  
See Figures 19, 20, and 21. The vent may terminate through a  
sidewall as shown in Figure 19 or through the roof as shown in  
Figures 20 and 21.  
The vent system must terminate so that proper clearances  
are maintained as cited in local codes or the current  
edition of the National Fuel Gas Code, (ANSI Z223.1, 12.9.1  
through 12.9.4) or the Natural Gas and Propane Installation  
Code (CAN/CSA-B149.1).  
Never use this water heater unless it is completely full of water. To prevent  
damage to the tank, the tank must be filled with water. Water must flow  
from the hot water faucet before turning “ON” gas to the water heater.  
Instructions on proper installation through a sidewall are provided  
in Figures 15A, 15B, 15C, and 15D.  
Plan the vent system layout so that proper clearances are  
maintained from plumbing and wiring.  
To ll the water heater with water:  
1. Close the water heater drain valve by turning the handle to the right  
(clockwise). The drain valve is on the lower front of the water heater.  
2. Open the cold water supply valve to the water heater.  
note: the cold water supply valve must be left open when  
the water heater is in use.  
3. To insure complete filling of the tank, allow air to exit by opening the  
nearest hot water faucet. Allow water to run until a constant flow is  
obtained. This will let air out of the water heater and the piping.  
4. Check all water piping and connections for leaks. Repair as needed.  
Vent pipes serving power vented appliances are classified by  
building codes as “vent connectors”. Required clearances from  
combustible materials must be provided in accordance with  
information in this manual under FACTS TO CONSIDER ABOUT  
LOCATION and INSTALLING THE WATER HEATER, and with  
the National Fuel Gas Code and local codes.  
16  
u.s. power vent  
warnInG  
VENT HOOD(S) MAY BE  
eXtreMelY hot  
durInG operatIon.  
FIGURE 15A.  
cautIon  
to prevent eXhaustInG products froM cIrculatInG to the aIr IntaKe In  
wIndY/cold areas, the MaXIMuM practIcal dIstance Between these two  
terMInals Is recoMMended.  
warnInG  
VENT HOOD(S) MAY BE  
eXtreMelY hot  
canadIan power vent  
durInG operatIon.  
FIGURE 15B.  
17  
u.s. dIrect vent  
warnInG  
VENT HOOD(S) MAY BE  
eXtreMelY hot  
durInG operatIon.  
FIGURE 15C.  
cautIon  
to prevent eXhaustInG products froM cIrculatInG to the aIr IntaKe In  
wIndY/cold areas, the MaXIMuM practIcal dIstance Between these two  
terMInals Is recoMMended.  
canadIan dIrect vent  
warnInG  
VENT HOOD(S) MAY BE  
eXtreMelY hot  
durInG operatIon.  
FIGURE 15D.  
18  
of existing venting system must be performed prior to any installation  
work. Verify that correct material as detailed above has been used,  
andthattheminimumormaximumventlengthsandterminallocation  
as detailed in this manual have been met. Carefully inspect the entire  
venting system for any signs of cracks or fractures, particularly at  
joints between elbows and other fittings and straight runs of vent  
pipe. Check system for signs of sagging or other stresses in joints as  
a result of misalignment of any components in the system. If any of  
these conditions are found, they must be corrected in accordance with  
the venting instructions in this manual before completing installation  
and putting the water heater into service.  
plannInG the vent sYsteM  
Plan the route of the vent system from the exhaust elbow to the  
planned location of the vent terminal.  
1. Layout total vent system to use a minimum of vent pipe and elbows.  
2. This water heater is capable of venting flue gases equivalent to  
25’ (7.6 m) of 2” pipe, 65’ (19.8 m) of 3” pipe, or 128’ (39.0 m) of  
4” pipe as listed in Table 1.  
TABLE 1  
Number of  
90° Elbows  
2” Maximum  
Pipe - ft. (m)  
20 (6.1)  
15 (4.6)  
3” Maximum  
Pipe - ft. (m)  
60 (18.3)  
55 (16.8)  
50 (15.2)  
45 (13.7)  
40 (12.2)  
35 (10.7)  
4” Maximum  
Pipe - ft. (m)  
120 (36.6)  
112 (34.1)  
104 (31.7)  
96 (29.3)  
note: a. For water heaters in locations with high ambient  
temperatures (above 100°F) it is recommended that CPVC or  
ABS pipe and fittings be used. B. A 22.5 degree elbow (2” vent  
pipe) or a 45 degree elbow (3” and 4” vent pipe) with an installed  
screen VENT TERMINAL must be used in all cases.  
1
2
3
4
5
6
10 (3.0)  
--  
--  
--  
4. There will be some installations where condensate will be formed  
in the horizontal runs of the vent system. This condensate will  
run into the condensate elbow. The water heater is shipped with  
a condensate hose that attaches to the condensate elbow. No  
other tee or fitting is required.  
88 (26.8)  
80 (24.3)  
The minimum vent lengths for each of the pipe sizes is one 90° plus  
2’ (61 cm) of straight pipe and the appropriate termination.  
note: The equivalent feet (m) of pipe listed above are exclusive  
of the termination. That is, the termination, with an installed  
screen, is assumed to be in the system and the remainder of the  
system must not exceed the lengths discussed above.  
condensate  
Thiswaterheaterisacondensingunitandrequiresadraintobelocatedin  
close proximity to allow the condensate to drain safely. The condensate  
drains from the unit at the exhaust tee located at the bottom of the unit  
(see figure 16). Condensate from this water heater is mildly acidic.  
Please note that some local codes require that condensate is treated  
by using a pH neutralizing filter prior to disposal.  
3. The exhaust elbow assembly is designed to accept only straight  
sections of 2” pipe. To start, a minimum of 2” (5.1cm) of 2” pipe  
must be inserted and glued to the exhaust elbow assembly if  
utilizing 3” or 4” vent pipe. Use the same method with the blower  
inlet if a direct vent configuration is utilized.  
Caution must be used to ensure that the drain is free and clear of debris  
and will not allow backflow through the condensate hose. Consideration  
must be given to avoid freezing of the condensate lines which could  
result in excessive build up of condensate inside the water heater.  
Waterproof heat tape may be required to prevent freezing of the condensate  
lines. Please ensure that the outlet of the condensate drain does  
not create a slippery condition which could lead to personal injury.  
If using 2” inch vent pipe:  
A minimum of 2” (5.1cm) diameter vent pipe must be attached  
to the exhaust elbow assembly. The total system cannot exceed  
the lengths discussed above, where each elbow is equal to 5  
equivalent feet (1.5m) of straight pipe.  
If using 3” or 4” inch vent pipe:  
Two inches (5.1cm) of 2” pipe must be attached to the exhaust  
elbow assembly before adding a reducer to acquire the desired  
pipe diameter. An appropriately sized 45 degree elbow (supplied  
locally-a schedule 40 DWV) vent terminal must be obtained with  
an equivalent screen (supplied in vent kit). The total system cannot  
exceed the equivalent pipe lengths discussed above where each  
elbow is equal to 5 feet (1.5m) of straight pipe (3” vent pipe) or 8  
feet (2.4m) of straight pipe (4” vent pipe).  
u.s. InstallatIons:  
note: This unit can be vented with PVC pipe materials (Cellular Core  
ASTM-F891; DWV ASTM-D2665 or CSA B181.2; Schedule 40, 80,  
120 ASTM-D1785 or CSA B137.3; or SDR Series ASTM-D2241 or  
CSA B137.3), CPVC pipe materials (CPVC41 ASTM-D2846 or CSA  
B137.6; Schedule 40, 80ASTM-F441 or CSAB137.6; or SDR Series  
ASTM-F442), ABS pipe materials (Schedule 40 DWV ASTM-D2661  
or CSAB181.1 or Schedule 40 DWV Cellular CoreASTM-F628). The  
fittings, other than the TERMINATION should be equivalent to PVC-  
DWV fittings meetingASTM D-2665 (Use CPVC fittings,ASTM F-438  
for CPVC pipe and ABS fittings, ASTM D-2661/3311 for ABS pipe).  
If CPVC or ABS pipe and fittings are used, then proper cement must  
be used for all joints, including joining the pipe to Termination (PVC  
Material). If local codes do not allow the use of the PVC termination  
when a material other than PVC is used for venting, then an equivalent  
fitting of that material may be substituted if the screen in the PVC  
terminal is removed and inserted into the new fitting.  
condensatIon warnInG: thIs water heater IsacondensInG  
unItand requIresadraIn to Be located In close proXIMItY  
to allow condensate to draIn safelY. the condensate  
draIns froM unIt at the eXhaust elBow located at  
BottoM of unIt. note: It Is IMportant that the condensate  
hose not Be elevated aBove the eXhaust elBow, see  
FIGURE 16. CONDENSATE BUILD-UP WILL BLOCK THE EXHAUST  
outlet, whIch wIll cause IMproper operatIon.  
canadian Installation of this water heater must comply with can/  
CSA B149.1 - Natural Gas and Propane Installation Code which  
requires the vent system components be certified to ULC S636.  
This water heater has been design certified to be vented with PVC  
pipe certified and marked as complying with ULC S636. This water  
heater is supplied with a 2 inch 22.5 degree termination elbow that is a  
special fitting that must be used with the appliance.Any outlet piping,  
fittings and glue used to vent this appliance that is not supplied by the  
manufacturer must comply with the ULC S636 requirements.  
PVC Materials should use ASTM D-2564 Grade Cement; CPVC  
Materials should use ASTM F-493 Grade Cement and ABS  
Materials should use ASTM D-2235 Grade Cement.  
If the water heater is being installed as a replacement for an existing  
power vented heater in pre-existing venting, a thorough inspection  
FIGURE 16.  
19  
InstallatIon of vent sYsteM  
dIrect ventInG  
The air intake provided on the unit contains a mesh screen to prevent  
large particles from entering the unit.  
Before beginning installation of piping system thoroughly read  
the section of this manual VENT PIPE PREPARATION.  
If you are installing your system so that it vents through roof,  
please refer to section titled INSTALLATION OF VERTICAL  
VENT SYSTEM.  
vent terMInal InstallatIon, sIdewall  
1. Install the vent terminal by using the cover plate as a template  
to mark the hole for the vent pipe to pass through the wall.  
BEWARE OF CONCEALED WIRING AND PIPING INSIDE  
THE WALL.  
2. If the Vent Terminal is being installed on the outside of a  
finished wall, it may be easier to mark both the inside and  
outside wall. Align the holes by drilling a hole through the  
center of the template from the inside through to the outside.  
The template can now be positioned on the outside wall using  
the drilled hole as a centering point for the template.  
FIGURE 18B.  
WHEN THE UNIT IS TO BE SETUP AS A DIRECT VENT, THE  
MESH SCREEN MUST BE REMOVED. THE INLET VENT PIPE  
MAY THEN BE GLUED TO THE AIR INTAKE (See Figure 18B)  
PROVIDED ON THE UNIT. THE SCREEN REMOVED FROM THE  
INTAKE NEEDS TO BE INSERTED INTO THE 2” - 22.5 DEGREE  
VENT TERMINAL SUPPLIED IN THE VENT TERMINAL KIT.  
3. A) MASONRY SIDE WALLS  
Chisel an opening approximately one half inch (1.3 cm) larger  
than the marked circle.  
B) WOODEN SIDE WALLS  
dIrect vent terMInal InstallatIon IMportant  
Drill a pilot hole approximately one quarter inch (0.64 cm) outside  
of the marked circle. This pilot hole is used as a starting point  
for a saws-all or sabre saw blade. Cut around the marked  
circle staying approximately one quarter inch (0.64 cm) outside  
of the line. (This will allow the vent to easily slide through  
the opening. The resulting gap will be covered up by the  
Vent Terminal cover plate.) Repeat this step on inside wall if  
necessary.  
THIS UNIT CONSISTS OF TWO VENT TERMINALS - AN INTAKE  
VENTTERMINALANDAN EXHAUST VENTTERMINAL. THE INTAKE  
VENT TERMINAL IS A 2” 22.5° PVC ELBOW(-) WITH A MESH WIRE  
SCREEN AND THE EXHAUST VENT TERMINAL IS A 2” 22.5° PVC  
ELBOW WITH A MESH WIRE SCREEN.  
NOTE: TO PREVENT EXHAUSTING PRODUCTS FROM  
CIRCULATING TO THE AIR INTAKE IN WINDY/COLD AREAS,  
THE MAXIMUM PRACTICAL DISTANCE BETWEEN THESE TWO  
TERMINALS IS RECOMMENDED.  
SEQUENCE OF INSTALLATIONS, FIGURE 18A  
Cut a length of PVC pipe about 3.5 inches (8.9 cm) longer than the  
wall thickness at the opening. Glue the vent terminal to this  
section of pipe. Slide the wall plate over the pipe to stop against  
the vent terminal. Place a bead of caulking (not supplied) around  
the gap between the pipe and cover plate. Apply enough to  
fill some of the gap between the pipe and wall. Place some of  
the caulking on the back of the plate to hold it against the wall  
after installation. If the vent pipe is installed up to the wall, with  
a coupling on the end against the wall opening, the pipe with  
the vent terminal can be prepared for gluing before inserting  
through the wall. Slide the pipe through the wall and insert  
into the coupling on the other side of the wall, making sure that  
the vent terminal ends up pointed in the correct position, see  
Figure 18A.  
FIGURE 18C.  
WHEN LOCATING THE TERMINALS ON A SIDEWALL, THE  
FOLLOWING SPECIFICATIONS PERTAINING TO TERMINAL  
LOCATION MUST BE FOLLOWED.  
1. The intake air terminal and the exhaust vent terminal must terminate  
on the same exterior wall and must be separated by a minimum of  
24” (61cm) on vertical centerline (see Figure 18C). In colder climates  
increasing the 24” (61cm) minimum will reduce possibility of frost  
over from side winds blowing exhaust vapors to the air intake of the  
direct vent.  
2. The horizontal centerline of the intake air terminal may not be located  
lower than the horizontal centerline of the exhaust vent terminal (see  
Figure 18C).  
VENT TERMINATION - FIGURE 18A.  
20  
InstallatIon sequence  
vertIcal vent terMInal InstallatIon  
For installations in the City of Los Angeles, California Category IV  
PVC Pipe such as that manufactured by Brownline Pipe Company,  
must be used as vent pipe material.  
IMportant  
when terMInatInG throuGh a roof, the followInG  
specIfIcatIons pertaInInG to terMInal locatIon  
Must Be followed.  
cautIon  
vent terMInals supplIed wIth heater Must Be used.  
1. Proper support must be provided for all pipe protruding through  
NOTE: BEFORE BEGINNING INSTALLATION OF ANY  
VENT PIPE READ THE VENT PIPE MANUFACTURER’S  
INSTALLATION INSTRUCTIONS.  
the roof.  
2. The vertical roof terminations should be sealed with a plumbing  
roof boot or equivalent flashing.  
1. After the points of termination have been determined,  
use the cover plates as templates to mark the holes for  
the vent pipes to be inserted through the wall. BEWARE OF  
CONCEALED WIRING AND PIPING INSIDE OF WALL. If the  
vent terminals are being installed on the outside of a finished  
wall, it may be easier to mark both the inside and outside  
wall. Align the holesby drilling a hole through the center of the  
template from the inside through to the outside. The template  
can now be positioned on the outside wall using the drilled holes  
as a centering point for the template.  
3. The intake vent termination and the exhaust vent termination must  
penetrate the same side of roof.  
4. The center line of the intake vent termination and the center  
line of the exhaust vent termination must be no closer  
than 24” (61cm).  
A.) MASONRY SIDE WALLS Chisel an opening approximately  
1/2” (1.3 cm) larger than the marked circle.  
5. The intake vent terminal and the exhaust vent terminal must be  
oriented facing downward and the same direction.  
B.) WOODEN SIDE WALLS Drill a pilot hole approximately  
one quarter inch outside of the marked circle. This  
pilot hole is used as a starting point for a saws-all or  
sabre saw blade. Cut around the marked circle staying  
approximately one quarter inch outside of the line.  
(This will allow the vent pipe to easily slide through  
the opening. The resulting gap will be covered by the  
vent terminal cover plates.) Repeat this step on the  
inside wall if necessary.  
The specifications are displayed in Figures 20 & 21.  
NOTE: Exhaust vent terminal is installed using the same  
procedure.  
2. Cut a length of 3” PVC pipe about 3.5” (8.9 cm) longer than the  
wall thickness at the opening.  
3. Glue the intake vent terminal to the section of the pipe.  
4. Slide the wall plate over pipe to stop against intake vent terminal.  
5. Place a bead of caulking (not supplied) around the gap between  
the pipe and the wall. Place some of the caulking on the  
back of the plate to hold it against the wall after installation.  
6. If the vent pipe is installed up to the wall, with a coupling on the  
end against the wall opening, the pipe with the vent terminal can  
be prepared for gluing before inserting through the wall. Slide the  
pipe through the wall and insert into coupling on the other side of  
the wall, making sure that the vent terminal ends up pointed in the  
correct position (Figure 19).  
FIGURE 20.  
FIGURE 19.  
FIGURE 21.  
21  
InstallatIon of vent sYsteM, sIdewall  
With the route of the venting system and selection of materials completed,  
as discussed in the section of this manual titled PLANNING THE VENT  
SYSTEM, the through the wall vent terminal in place and the first section  
of piping, up to first elbow, installed at the blower it is time to complete the  
installation of the venting system for the sidewall installation.  
FIGURE 23.  
IMportant  
The vent system must terminate so that proper clearances are  
maintained as cited in local codes or the current edition of the  
National Fuel Gas Code (ANSI Z223.1) or the Natural Gas and  
Propane Installation Code (CAN/CSA-B149.1) and as listed below:  
FIGURE 22.  
Before completing the installation of the venting system be sure to read  
the sections of this manual discussing the proper method of cutting and  
cementing PVC pipe and fittings: VENT PIPE PREPARATION.  
1. VentTermination must extend a minimum of 18 inches (46 cm) above  
roof or 18 inches (46 cm) above the anticipated snow level to prevent  
blockage of the vent termination, as shown in Figures 20 and 21.  
It is recommended that the completion of the venting system start at  
the blower assembly and run to the coupling on the inside wall of the  
vent terminal, Figure 18A.  
concentrIc vent InstallatIon  
This appliance is certified for concentric venting with concentric vent  
kit #9003910105. Follow instructions below for proper installations.  
The vent system piping should be supported every 5 feet (1.5 m)  
of vertical run and every 3 feet (91 cm) of horizontal run. All piping  
and fittings must be joined by the proper procedures as described  
under: VENT PIPE PREPARATION.  
KIt coMponents  
Each kit is comprised of the following:  
InstallatIon of vertIcal vent sYsteM  
Item  
Rain Cap  
SDR-26 pipe  
SDR-26 pipe  
Y Concentric Fitting  
Installation Instructions  
Description  
3 in.  
4 in. dia.  
2½ in. dia.  
3 in.  
Qty.  
1
1
1
1
A proper flashing or “BOOT” should be used to seal the pipe where it  
exits the roof. The total vent system should not exceed the equivalent  
feet of pipe as listed in Table 1.  
Provide support for all pipe protruding through the roof. All piping  
should be properly secured. The vent system piping should be  
supported every 5 feet (1.5 m) of vertical run and every 3 feet (91 cm)  
of horizontal run. All piping and fittings must be joined by the proper  
procedures as described under: VENT PIPE PREPARATION.  
194504  
1
Field supplied pipe and fittings are required to complete the  
installation.  
22  
This concentric vent termination kit may be used with 3 or 4 inch diameter 1. Determine best location for termination kit.  
pipe systems. When connecting to a 4 in. diameter pipe system a 3 x 4 note: roof termination is preferred since it is less  
inch field supplied reducer is to be installed at the intake and exhaust susceptible to damage, has reduced chances to intake  
connection of the concentric vent termination kit.  
contaminants, and less visible vent vapors.  
2. Cut 1 hole (5 in. diameter)  
safetY consIderatIons  
3. Partially assemble concentric vent termination kit.  
a) Cement Y concentric fitting to larger diameter kit  
pipe, see Figure A.  
Installing and servicing water heating equipment can be hazardous due to  
gas and electrical components. Installation and service of the concentric  
vent termination requires ability equivalent to that of a qualified installer or  
service agent, see page 2. All precautions in the literature, on tags, and  
labels attached to the unit must be observed.  
b) Cement rain cap to smaller diameter kit pipe, see Figure A.  
Follow all safety codes. Wear safety glasses and work gloves.  
fIGure d.  
note: Instead of cementing the smaller pipe to the rain cap, a  
field-supplied stainless steel screw may be used to secure the  
2 components together when field disassembly is desired for  
cleaning, see figure d.  
fIGure a.  
warnInG  
when using alternate screw method, drill clearance hole in rain  
cap and pilot hole in vent pipe for screw size being used. failure  
to drill adequate holes may cause cracking of pvc components,  
allowing combustion products to be recirculated. failure to  
follow this warning could result in personal injury or death.  
warnInG  
do not operate the heater with rain cap removed or recirculation  
of combustion products may occur. water may also collect inside  
larger combustion-air pipe and flow to the burner enclosure.  
failure to follow this warning could result in product damage or  
improper operation, personal injury or death.  
fIGure B.  
4. Install  
Y
concentric fitting and pipe assembly through  
*
Dimension 21 1/8 in. may be lengthened to 60 in. maximum.  
Dimension 21 1/8 in. may also be shortened by cutting the  
pipes, provided in the kit, to 12 in. minimum.  
structure’s hole and field supplied roof boot/flashing.  
** Dimension 39 will change accordingly as dimension  
21 1/8 in. is lengthened or shortened.  
fIGure c.  
fIGure e.  
INSTALLATION PROCEDURE 1 ROOF TERMINATION,  
see figure c.  
note: do not allow insulation or other materials to accumulate  
inside pipe assembly when installing through hole.  
23  
5. Secure assembly to roof structure as shown in Figure E using  
field supplied metal strapping or equivalent support material.  
NOTE: See the venting information (pages 16-20) in this  
manual for additional vent location requirements.  
note: ensure termination height is above the roof surface or  
anticipated snow level (1 ft. in U.S.A. or 1-1/2 ft. in Canada) as  
shown in figure c.  
2. Cut 1 hole (5 in. diameter)  
3. Partially assemble concentric vent termination kit.  
6. Install rain cap and small diameter pipe assembly in  
roof penetration assembly, Ensure small diameter pipe  
a) Cement the Y concentric fitting to larger diameter  
kit pipe, see Figure A.  
is cemented and bottomed in  
Y
concentric fitting.  
7. Cement water heater combustion air intake and vent pipes to  
concentric vent termination assembly. See Figure E for  
proper pipe attachment.  
b) Cement the rain cap to the smaller diameter kit  
pipe, see Figure A.  
note: Instead of cementing the smaller pipe to the rain cap, a  
field-supplied stainless steel screw may be used to secure the  
2 components together when field disassembly is desired for  
cleaning, see figure d.  
8. Operate heater through 1 heat cycle to ensure combustion air  
and vent pipes are properly connected to concentric vent termination  
connections.  
note: all vent terminations must be the same height when  
installing multiple unit venting. If assembly is too short to meet  
heightrequirement,the2pipessuppliedinthekitmaybereplaced  
byusingsamediameter, fieldsuppliedSDR-26PVC(D2241)pipe.  
Do not extend the 21-1/8” dimension outer pipe to be more than  
60 inches, see Figure B.  
warnInG  
when using alternate screw assembly method, drill clearance  
hole in rain cap and pilot hole in vent pipe for screw being  
used. failure to drill adequate holes may cause cracking  
of pvc components, allowing combustion products to be  
recirculated. failure to follow this warning could result in  
personal injury or death.  
cautIon  
Do not use field-supplied couplings to extend pipes. Airflow  
restriction will occur and the heater pressure switch may cause  
intermittent operation.  
warnInG  
do not operate the heater with rain cap removed or  
recirculation of combustion products may occur. water may  
also collect inside larger combustion-air pipe and flow to the  
burner enclosure. failure to follow this warning could result  
in product damage or improper operation, personal injury  
or death.  
PROCEDURE 2 SIDE WALL TERMINATION, see Figure F.  
4. Install Y concentric fitting and pipe assembly through  
structure’s hole.  
note: do not allow insulation or other materials to accumulate  
inside pipe assembly when installing through hole.  
5. Install rain cap and small diameter pipe assembly in  
Y concentric fitting and large pipe assembly. Ensure  
small diameter pipe is bottomed and cemented in Y  
concentric fitting.  
6. Secure assembly to structure as shown in Figure G using field-  
supplied metal strapping or equivalent support material.  
note: ensure termination location clearance dimensions are as  
shown in the diagrams found in Figure 15 A through D. When  
extending the length of the 4” pipe, the added length beyond  
21-1/8” must be deducted from the maximum equivalent feet of  
vent pipe.  
fIGure f.  
1. Determine best location for termination kit.  
NOTE: Consideration for the following should be used when  
determining an appropriate location for the termination kit:  
note: If assembly needs to be extended to allow side  
wall thickness requirement, the 2 pipes supplied in  
the kit may be replaced by using same diameter, field-  
supplied SDR-26 PVC (D2241) pipe. Do not extend  
21 1/8” dimension more than 60 in. (See Figure B.)  
Termination kit positioned where the vent vapors will  
not damage plants/shrubs or air conditioning  
equipment.  
Termination kit positioned so it will not be affected by  
wind eddy that may allow recirculation of combustion  
products, or airborne leaves, or light snow.  
cautIon  
Do not use field-supplied couplings to extend pipes. Airflow  
restriction will occur and the heater pressure switch may cause  
intermittent operation.  
Termination kit positioned where it will not get damaged  
or be subjected to foreign objects, such as stones,  
balls, etc.  
7. Cement heater combustion-air and vent pipes to concentric  
vent termination assembly. See Figure G for proper pipe  
attachment.  
Termination kit positioned where the vent vapors will  
not be objectionable.  
24  
8. Operate heater through 1 heat cycle to ensure combustion-air and  
vent pipes are properly connected to concentric vent termination  
connections.  
figure h.  
Concentric Vent Terminations  
for Horizontal Direct Venting.  
fIGure G.  
MultI-concentrIc vent terMInatIons  
When two or more appliances are directed vented with concentric  
vent terminations near each other, each appliance must be  
individually vented. NEVER common vent this appliance. When  
two or more appliances are direct vented using concentric vent  
terminations, the appliances may be vented as shown in Figure H  
and Figure I.  
figure I.  
Concentric Vent Terminations for Vertical  
Direct Venting through a roof.  
25  
prIMer  
vent pIpe preparatIon  
1. INITIAL PREPARATION.  
It is recommended that Tetrahydrofuran (THF) be used to prepare the  
surfaces of pipe and fittings for solvent welding. Do not use water,  
rags, gasoline or any other substitutes for cleaning PVC or CPVC  
surfaces. A chemical cleaner such as MEK may be used.  
A.) Make sure the solvent cement you are planning to use  
is designed for the specific application you are attempting.  
B.) Knowthephysicalandchemicalcharacteristicsandlimitationsofthe  
PVC and CPVC piping materials that you are about to use.  
ceMent  
The cement should be a bodied cement of approximately 500 to  
1600 centipoise viscosity containing 10-20% (by weight) virgin PVC  
material solvated with tetrahydrofuran (THF). Small quantities of  
dimethyl formamide (DMF) may be included to act as a retarding  
agent to extend curing time. Select the proper cement; Schedule 40  
cement should be used for Schedule 40 pipe. Never use all-purpose  
cements, commercial glues and adhesives orABS cement to join PVC  
or CPVC pipe and fittings.  
C.) Know the reputation of your manufacturer and their products.  
D.) Knowyourownqualificationsorthoseofyourcontractor.Thesolvent  
weldingtechniqueofjoiningPVCandCPVCpipeisaspecializedskill  
just as any other pipe fitting technique.  
E.) Closelysupervisetheinstallationandinspectthenishedjobbefore  
start-up.  
F.) Contact the manufacturer, supplier, or competent consulting  
agency if you have any questions about the application or  
installation of PVC and CPVC pipe.  
G.) Take the time and effort to do a professional job. Shortcuts will only  
cause you problems and delays in start-up. By far, the majority of  
failures in PVC and CPVC systems are the result of shortcuts and/or  
improper joining techniques.  
2. SELECTION OF MATERIALS.  
applIcators  
Cutting Device - Saw or Pipe Cutter.  
Select a suitable pure bristle type paint brush. Use a proper width brush  
or roller to apply the primer and cement (see chart below). Speedy  
application of cement is important due to its fast drying characteristics.  
IMPORTANT NOTE: A dauber type applicator should only be used  
on pipe sizes 2” and below. For larger diameter pipe, a brush or roller  
must be used.  
Deburring Tool, Knife, File, or Beveling Machine (2” and above).  
Brush - Pure Bristle.  
Rag - Cotton (Not Synthetic).  
Primer and Cleaner.  
RECOMMENDED BRUSH* SIZE FOR PRIMER  
and ceMent applIcatIons  
Solvent Cement - PVC for PVC Components and CPVC for CPVC  
Components.  
Nominal Pipe (IPS)  
Size Brush Width  
1.5” (3.8cm)  
2
3
Containers - Metal or Glass to hold Primer and Cement. Select the  
type of PVC or CPVC materials to be used on the basis of their  
application with respect to chemical resistance, pressure rating,  
temperature characteristics, etc.  
1.5”-2.5” (3.8cm - 6.4cm)  
*use onlY natural BrIstle  
Insertion Tool - Helpful for larger diameter pipe and fittings 6 inches  
(15.2cm) and above.  
3. MAKING THE JOINT.  
A.) Cutting Pipe must be squarely cut to allow for the proper  
interfacing of the pipe end and the fitting socket bottom. This  
can be accomplished with a miter box saw or wheel type cutter  
Wheel type cutters are not generally recommended for larger  
diameters since they tend to flare the corner of the pipe end. If  
this type of cutter is used, the flare on the end must be  
completely removed.  
NOTE: Power saws should be specifically designed to cut plastic pipe.  
step a  
26  
B. deburring  
Use a knife, plastic pipe deburring tool, or file to remove burrs from  
the end of small diameter pipe. Be sure to remove all burrs from  
around the inside as well as the outside of the pipe. A slight chamfer  
(bevel) of about 10°-15° should be added to the end to permit easier  
insertion of the pipe into the end of the fitting. Failure to chamfer the  
edge of the pipe may remove cement from the fitting socket, causing  
the joint to leak.  
step B  
C. Test dry fit of the joint  
step e  
Tapered fitting sockets are designed so that an interfaced fit should  
occur when the pipe is inserted about 1/3 to 2/3 of the way into the  
socket.Occasionally,whenpipettingdimensionsareatthetolerance  
extremes, it will be possible to fully insert dry pipe to the bottom of  
the fitting socket. When this happens, a sufficient quantity of cement  
must be applied to the joint to fill the gap between the pipe and fitting.  
The gap must be filled to obtain a strong, leak-free joint.  
f. joint assembly  
Working quickly, insert the pipe into the fitting socket bottom and  
give the pipe or fitting a 1/4 turn to evenly distribute the cement.  
Do not continue to rotate the pipe after it has hit the bottom of the  
fitting socket. A good joint will have sufficient cement to make a  
bead all the way around the outside of the fitting hub. The fitting  
will have a tendency to slide back while the cement is still wet  
so hold the joint together for about 15 seconds.  
d. Inspection, cleaning, priming  
Visually inspect the inside of the pipe and fitting sockets and  
remove all dirt, grease or moisture with a clean dry rag. If wiping  
fails to clean the surfaces, a chemical cleaner must be used.  
Check for possible damage such as splits or cracks and replace  
if necessary.  
depth-of-entry  
Marking the depth of entry is a way to check if the pipe has  
reached the bottom of the fitting socket in Step F. Measure  
the fitting depth and mark this distance on the pipe O.D. You  
may want to add several inches to the distance and make a  
second mark as the primer and cement will most likely destroy  
your first one.  
step f  
G. cleanup and joint movement  
Remove all excess cement from around the pipe and fitting with a  
dry cotton rag. This must be done while the cement is still soft.  
The joint should not be disturbed immediately after the cementing  
procedure, and sufficient time should be allowed for proper curing  
of the joint. Exact drying time is difficult to predict because it  
depends on variables such as temperature, humidity and cement  
integrity. For more specific information, you should contact your  
solvent cement manufacturer.  
Apply primer to the surface of the pipe and fitting socket with  
a natural bristle brush. This process softens and prepares the  
PVC or CPVC for the solvent cementing step. Move quickly and  
without hesitation to the cementing procedure while the surfaces  
are still wet with primer.  
e. application of solvent cement  
• Apply the solvent cement evenly and quickly around the  
outside of the pipe at a width a little greater than the depth  
of the fitting socket.  
• Apply a light coat of cement evenly around the inside of the  
fitting socket. Avoid puddling.  
• Apply a second coat of cement to the pipe end.  
step G  
27  
open. When this switch prevents the unit from igniting, most likely the  
exhaust is blocked by some means. Check to see if the condensate  
is allowed to flow freely from the exhaust elbow and for obstructions  
in the exhaust venting and exhaust vent terminal. Also verify that  
the vent length does not exceed the maximum allowed as shown in  
the Vent Section of this manual.  
controls and swItches  
This model is provided with three pressure switches. These switches  
are essential to the safe and proper operation of the unit. All switches  
are wired in series. The controller is set up to shut the unit down  
whenever there is a failure of any of the switches. It is important to  
understand the purpose of each switch.  
BlocKed IntaKe swItch  
(SEE FIGURE 12)  
The Blocked Intake Switch is set up to shut the unit off when a  
build-up of negative pressure in the intake air pipe occurs. This  
switch is a negative pressure switch that requires an increase in  
negative pressure to change the electrical contacts from normally  
closed to open. The switch is connected to the pressure tap on the  
PVC pipe connected to the inlet of the blower. When this switch  
prevents the unit from igniting, most likely the intake is blocked.  
Verify that the screen on the intake air connection (conventional  
vent), the intake air pipe and termination (direct vent installations)  
are free of obstructions that may prevent air from entering the unit.  
Insure the screen on intake air connection has been removed on  
direct vent installations, see Figure 18B. Also verify the intake  
air pipe length does not exceed the maximum allowed as shown  
in the Vent Section of this manual.  
FIGURE 12.  
on/off swItch  
The ON/OFF Switch is a single-pole, single-throw rocker switch. This  
switch provides 120V from the line source to the heater.  
Blower prover swItch  
(SEE FIGURE 12)  
The Blower Prover Switch is provided on the heater to verify that  
the fan is operating. It is a positive pressure switch whose electrical  
contacts are normally open. When the fan increases the pressure  
in the burner, the pressure switch will allow the electrical contacts  
to close. The pressure switch is connected to the burner tap by a  
piece of tygon tubing. This tubing must be connected in order for  
the switch to change the electrical contacts. The controller requires  
that the electrical contacts on this air flow switch be open before it  
will allow the blower to come on.  
cautIon  
the water heater Is polarItY sensItIve. Before  
applYInG electrIcItY to thIs heater Be certaIn that  
supplY neutral wIre to Ground checK IndIcates  
ZERO VOLTAGE.  
hot surface IGnIter  
BlocKed eXhaust swItch  
The Hot Surface Igniter is a device that ignites the main burner by  
high temperature (>1800°F or >982°C). When 120VAC is applied  
to the igniter, sufficient heat is generated to ignite the main burner.  
Although improvements have been made to strengthen the igniter,  
it is still fragile and care must be taken when handling the igniter to  
prevent breakage.  
(SEE FIGURE 12)  
The Blocked Exhaust Switch is set up to shut the unit off when a  
build-up of positive pressure in the exhaust vent pipe occurs. This  
switch is a positive pressure switch that requires an increase in  
pressure to change the electrical contacts from normally closed to  
28  
cautIon  
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND  
DANGEROUS OPERATION. VERIFY PROPER OPERATION AFTER SERVICING.  
THIS WATER HEATER  
IS POLARITY SENSITVE.  
BEFORE APPLYING  
ELECTRICITY TO THIS  
HEATER BE CERTAIN  
THAT SUPPLY NEUTRAL  
WIRE TO GROUND  
CHECK INDICATES ZERO  
VOLTAGE.  
POWER VENT WIRING SCHEMATIC - FIGURE 24.  
29  
for Your safetY read Before lIGhtInG  
warnInG: If you do not follow these instructions exactly, a fire  
or explosion may result causing property damage, personal injury or  
loss of life.  
Before operatInG: entIre sYsteM Must Be fIlled wIth water and aIr purGed froM all lInes.  
A. This appliance does not have a pilot. It is equipped with  
an ignition device which automatically lights the burner.  
do not try to light the burner by hand.  
B. Before operatInG smell all around the appliance  
area for gas. Be sure to smell next to the floor because  
some gas is heavier than air and will settle on the floor.  
what to do If You sMell Gas:  
If you cannot reach your gas supplier, call the fire  
department.  
C. Use only your hand to push in the gas control buttons.  
Never use tools. If the control buttons will not push in, don’t  
try to repair them, call a qualified service technician. Force  
or attempted repair may result in a fire or explosion.  
D. Do not use this appliance if any part has been under  
water. Immediately contact a qualified installer or service  
agency to replace a flooded water heater. Do not attempt  
to repair the unit! It must be replaced!  
Do not try to light any appliance.  
Do not touch any electric switch;  
Do not use any phone in your building.  
Immediately call your gas supplier from a neighbor’s  
phone. Follow the gas supplier’s instructions.  
operatInG InstructIons  
5. This appliance is equipped with a device which  
automatically lights the burner.  
do not trY to lIGht the Burner BY hand.  
UP  
Operating Set Point  
Status: Heating  
120 F  
Help  
6. Wait five (5) minutes to  
gas. If you smell gas,  
clear out any  
STOP! Follow “B”  
OFF  
GAS  
in the safety information above on this label.  
If you don’t smell gas.  
O
N
DN  
Menu  
7. Turn on all electrical power to the appliance.  
8. Set the ON/OFF switch on the control box to the  
“ON” position.  
9. Set the thermostat to the desired setting.  
cautIon: hotter water increases the risk  
of scald injury. consult the instruction  
manual before changing temperature.  
on/off swItch  
1.  
STOP! Read the safety information above,  
on this label.  
10.If the appliance will not operate, follow the  
instructions “TO TURN OFF GAS TO APPLIANCE”  
and call your technician or gas supplier.  
2. Set the ON/OFF switch on the control panel to  
the “ON” position.  
3. Set the thermostat to the lowest setting.  
warnInG: turn off all electrIc  
power Before servIcInG  
4. Set the ON/OFF switch on the control box to the  
“OFF” position.  
to turn off Gas to applIance  
1. Set the thermostat to the lowest setting.  
2. Set the ON/OFF switch on the control panel to the  
“OFF” position.  
3. Turn off all electrical power to the appliance if service  
is to be performed.  
30  
teMperature reGulatIon  
It is recommended that lower water temperatures be used to avoid  
The water temperature is controlled using the Temperature  
Control on the Display at the front of the unit (See Figure 1).  
This control utilizes a temperature probe to determine the tank  
temperature. The primary temperature probe is located at the  
top of the tank.  
the risk of scalding. It is further recommended, in all cases, that the  
water temperatures be set for the lowest temperature which satisfies  
your hot water needs. This will also provide the most energy efficient  
operation of the water heater.  
The temperature may be adjusted from 90°F/32°C to 160°F/71°C.  
The thermostat was adjusted to 120°F/49°C before the heater  
was shipped from the factory. It is recommended that lower water  
temperature be used to avoid the risk of scalding. It is further  
recommended, in all cases, that the water temperature be set  
for the lowest temperature which satisfies your hot water needs.  
This will also provide the most energy efficient operation of the  
water heater and minimize scale formation.  
Valves for reducing the point-of-use temperature by mixing cold  
and hot water are available, see Figure 2. Also available are  
inexpensive devices that attach to faucets to limit hot water  
temperatures. Contact a licensed plumber or the local plumbing  
authority.  
The table below shows the approximate time-to-burn relationship for  
normal adult skin. Short repeated heating cycles caused by small  
hot water uses can cause temperatures at the point of use to exceed  
the thermostat setting by up to 20°F/11°C. If you experience this  
type of use, you should consider using lower temperature settings  
to reduce scald hazards.  
HOT WATER CAN SCALD: Water heaters are intended to produce  
hot water. Water heated to a temperature which will satisfy space  
heating, clothes washing, dish washing, and other sanitizing needs  
can scald and permanently injure you upon contact. Some people  
are more likely to be permanently injured by hot water than others.  
These include the elderly, children, the infirm, or physically/mentally  
handicapped. If anyone using hot water from this heater fits into  
one of these groups or if there is a local code or state law requiring  
a certain temperature water at the hot water tap, then you must  
take special precautions. In addition to using the lowest possible  
temperature setting that satisfies your hot water needs, a means  
such as a mixing valve, should be used at the hot water taps used  
by these people or at the water heater. Mixing valves are available  
at plumbing supply or hardware stores, see Figure 2. Follow  
manufacturer’s instructions for installation of the valves. Before  
changing the factory setting on the thermostat, read the “Temperature  
Regulation” section in this manual.  
time to produce  
2nd & 3rd Degree  
temperature setting  
Burns on adult skin  
160°F (71°C)  
150°F (65°C)  
140°F (60°C)  
130°F (54°C)  
120°F (49°C)  
About 1/2 Second  
About 1 1/2 Seconds  
Less than 5 Seconds  
More than30Seconds  
More than5 minutes  
Never allow small children to use a hot water tap, or to draw their own  
bath water. Never leave a child or handicapped person unattended  
in a bathtub or shower.  
The water heater should be located in an area where the general  
public does not have access. If a suitable area is not available,  
a cover should be installed over the thermostat to prevent  
tampering. The water temperature setting was factory set at  
the lowest temperature; THIS WATER HEATER IS EQUIPPED  
WITH AN ADJUSTABLE THERMOSTAT TO CONTROL WATER  
TEMPERATURE. HOT WATER TEMPERATURES REQUIRED  
FOR AUTOMATIC DISHWASHER AND LAUNDRY USE CAN  
CAUSE SCALD BURNS RESULTING IN SERIOUS PERSONAL  
INJURY AND/OR DEATH. THE TEMPERATURE AT WHICH  
INJURY OCCURS VARIES WITH THE PERSON’S AGE AND THE  
TIME OF THE EXPOSURE. THE SLOWER RESPONSE TIME  
OF CHILDREN, AGED OR DISABLED PERSONS INCREASES  
THE HAZARDS TO THEM. NEVER ALLOW SMALL CHILDREN  
TO USE A HOT WATER TAP, OR TO DRAW THEIR OWN BATH  
WATER. NEVER LEAVE A CHILD OR DISABLED PERSON  
UNATTENDED IN A BATHTUB OR SHOWER.  
HI LIMIT SWITCH (E.C.O.)  
The top immersion well of the dual bulb controller also contains  
the high limit (energy cutoff) sensor. The high limit switch  
interrupts main burner gas flow should water temperature reach  
approximately 202°F/94°C.  
Should the high limit switch activate, the control system will  
automatically reset the unit once the water temperature in the  
tank falls below 140°F/60°C. If the unit is manually shut down  
and restarted, as long as the temperature in the tank is lower  
than 160°F/71°C, the unit will reset and initiate operation.  
If you experience higher than usual water temperature along with  
frequent automatic resetting of the system, this is evidence of high  
limit switch operation. The following are possible reasons for high  
limit switch operation.  
A malfunction in the thermostatic controls would allow the gas  
control valve thermostat to remain open causing water  
temperature to exceed the thermostat setting. The water  
temperature would continue to rise until high limit  
switch operation.  
THE WATER HEATER SHOULD BE LOCATED IN AN AREA  
WHERE THE GENERAL PUBLIC DOES NOT HAVE ACCESS TO  
SET TEMPERATURES.  
SETTING THE WATER HEATER TEMPERATURE AT 120°F/49°C  
WILL REDUCE THE RISK OF SCALDS. Some states require  
settings at specific lower temperatures.  
Contact your dealer or servicer if continued high limit switch  
operation occurs.  
31  
usInG the electronIc controller  
1. Overview  
Interaction with the water heater controller is done through an up, a down, and three operation buttons. These buttons are illustrated to the  
right. Operation of the three lower buttons is defined immediately above them on the screen. The [UP] and [DN] buttons are used to navigate  
through the menus and make adjustments to the water heater.  
While the water heater is operating, the user interface will display the desktop screen (if there are no active faults or warnings). An  
example of this screen is shown to the right. The temperature on this screen is the Operating Set Point. The Operating Set Point is the  
temperature at which the water heater will maintain the water inside the tank. The second line on the screen is a text description of the  
Operational State of the water heater (please see Operating States for more details).  
The following status icons describe graphically operational details of the heater. The legend of all the status icons is listed below.  
32  
2. Operating States  
In the main desktop screen, there are some specific Operating States that  
are indicated on the status line. These are summarized below:  
actIon:  
3. Adjusting the Operating Set Point  
From the Main Menu, press select to enter the "Temperatures" screen.  
The Operating Set Point of this water heater determines the regulated  
temperature for the water in the tank. This parameter is adjusted in the  
Temperature menu. Items in this menu allow you to monitor different  
temperature readings in the tank along with adjusting the Operating Set  
Point.  
dIsplaY:  
actIon:  
From the desktop screen, press Menu.  
dIsplaY:  
actIon:  
Press change then use the up and down buttons to change the Set  
Point.  
33  
3. Changing the Display Units  
4. Fault Conditions  
The display interface to the heater has the option of selecting between  
degrees Fahrenheit and degrees Celsius for temperature displays. This  
can be found in the “Display Settings” menu. Also in this menu, you may  
adjust how the backlight operates and the contrast of the LCD screen.  
This water heater is equipped with electronic controls that have the  
ability to monitor almost all aspects of the water heater operation. In  
the case that there is an undesirable or unsafe condition that occurs,  
the water heater controls will detect this condition and determine the  
appropriate action. Part of this is displaying the information on the LCD  
in plain text that accurately describes the condition and diagnostics  
information that can be used to correct the issue.  
actIon:  
From the Main Menu, press the Down button to highlight "Display  
Settings" then press Select.  
• Faults: This is a safety related condition that has been detected  
dIsplaY:  
by the heater.  
NOTE: When these conditions occur, the water heater will not  
continue any further heating cycles and the water will no longer be  
heated until the condition is corrected and, in most cases, power has  
been cycled.  
example of a fault:  
actIon:  
Use the UP and DOWN buttons to highlight the desired setting. Then  
press Change. Again, use the UP and DOWN buttons to scroll through  
the options for that setting.  
dIsplaY:  
advanced diagnostics Information  
When a fault has been declared, advanced information can be found in  
the control. By pressing the Advanced button, detailed information can  
be found regarding diagnosing and resolving the problem.  
warnInG: usage of the advanced information requires ability  
equivalent to that of a licensed tradesmen in the field involved.  
5. Access to the Current Fault  
When a fault has been detected by the control, it will automatically be  
displayed on the screen and the back light will blink. If you choose to leave  
the current fault by pressing the Back key, you can always return to the  
fault screen through the menu.  
actIon:  
Press update to accept the change or cancel to reject it.  
dIsplaY:  
34  
actIon:  
6. Viewing the Fault History  
To get to the current fault information screen, press Menu.  
The controller for this water heater will store a history of ten of the  
last Fault conditions that occurred. This is stored in the Fault History.  
Along with all the information about the fault, including a estimate  
time of when the fault occurred, information regarding the advanced  
diagnostics for that fault can be accessed at any time.  
dIsplaY:  
actIon:  
Press the down button for more information.  
dIsplaY:  
actIon:  
Press the down button to highlight "current Fault" and press select.  
dIsplaY:  
actIon:  
Press the down key to scroll through the fault history. If you select  
a specific fault, you may press the vIew button to view details  
regarding this fault.  
dIsplaY:  
actIon:  
Press the down button for more information.  
dIsplaY:  
7. Viewing Information About the Heater  
The electronic control for this water heater monitors many different aspects  
of the water to ensure safe and optimal operation. Much of the information  
monitored is available to view in two areas of the control. The first is the  
"Heater Status" and; the second is "Heater Information." These items  
can be selected through the main menu in the same fashion as described  
above. In these menus, detailed information about the water heater and  
the current status of specific conditions can be found.  
35  
for Your InforMatIon  
start up condItIons  
operatIonal condItIons  
sMellY water  
sMoKe/odor  
In each water heater there is installed at least one anode rod (see  
parts section) for corrosion protection of the tank. Certain water  
conditions will cause a reaction between this rod and the water.  
The most common complaint associated with the anode rod is one  
of a “rotten egg smell” in the hot water. The smell is a result of four  
factors which must all be present for the odor to develop:  
It is not uncommon to experience a small amount of smoke and  
odor during the initial start-up. This is due to burning off of oil  
from metal parts, and will disappear in a short while.  
therMal eXpansIon  
a. A concentration of sulfate in the supply water.  
b. Little or no dissolved oxygen in the water.  
c. A sulfate reducing bacteria which has accumulated within the  
water heater (this harmless bacteria is nontoxic to humans).  
d. An excess of active hydrogen in the tank. This is caused by the  
corrosion protective action of the anode.  
Smelly water may be eliminated or reduced in some water heater  
models by replacing the anode(s) with one of less active material, and  
then chlorinating the water heater tank and all water lines. Contact  
the local water heater supplier or a qualified service agency for  
further information concerning an Anode Replacement Kit and this  
chlorination treatment.  
Water supply systems may, because of such events as high  
line pressure, frequent cut-offs, the effects of water hammer  
among others, have installed devices such as pressure  
reducing valves, check valves, back flow preventers, etc.  
to control these types of problems. When these devices  
are not equipped with an internal by pass, and no other  
measures are taken, the devices cause the water system  
to be closed. As water is heated, it expands (thermal expansion)  
and closed systems do not allow for the expansion of  
heated water.  
If the smelly water persists after the anode replacement and chlorination  
treatment, we can only suggest that chlorination or aeration of the  
water supply be considered to eliminate the water problem.  
do not remove the anode leaving the tank unprotected. By doing  
so, all warranty on the water heater tank is voided.  
aIr” In hot water faucets  
The water within the water tank expands as it is heated  
and increases the pressure of the water system. If the  
relieving point of the water heater’s temperature-pressure  
relief valve is reached, the valve will release excess pressure. The  
temperature-pressure relief valve is not intended for the constant  
relief of thermal expansion. This is an unacceptable condition and  
must be corrected. It is recommended that any devices  
installed which could create a closed system have a  
by-pass and/or the system have an expansion tank  
or device to relieve the pressure built by thermal  
expansion in the water system. Expansion tanks are  
a v a i l a b l e f o r o r d e r i n g t h r o u g h  
a
l o c a l p l u m b i n g  
contractor. Contact the local water heater supplier  
or qualified service agency for assistance in controlling these  
situations.  
HYDROGEN GAS: Hydrogen gas can be produced in a hot water  
system that has not been used for a long period of time (generally  
two weeks or more). Hydrogen gas is extremely flammable and  
explosive. To prevent the possibility of injury under these conditions,  
we recommend the hot water faucet, located farthest away, be  
opened for several minutes before any electrical appliances  
which are connected to the hot water system are used (such as a  
dishwasher or washing machine). If hydrogen gas is present, there  
will probably be an unusual sound similar to air escaping through the  
pipe as the hot water faucet is opened. There must be no smoking  
or open flame near the faucet at the time it is open.  
stranGe sounds  
Possible noises due to expansion and contraction of some metal  
parts during periods of heat-up and cool-down do not necessarily  
represent harmful or dangerous conditions.  
Condensation causes sizzling and popping within the burner area  
during heating and cooling periods and should be considered  
normal. See “Condensate” in this section.  
36  
perIodIc MaIntenance  
water heater will create dangerous conditions which can cause  
ventInG sYsteM InspectIon  
DEATH, SERIOUS BODILY INJURY, OR PROPERTY DAMAGE.  
Contact a qualified installer or service agency to replace a  
flooded water heater. Do not attempt to repair the unit! It must be  
replaced!  
At least once a year a visual inspection should be made of the  
main burner and the hot surface igniter assembly for proper flame  
characteristics and ignition sequences. You should also check for  
sooting. Soot is not normal and will impair proper combustion. A visual  
inspection of the main burner and HSI igniter assembly should also be  
done at least once a year.  
Soot build-up indicates a problem that requires correction before  
further use. Turn “OFF” gas to water heater and leave off until repairs  
are made, because failure to correct the cause of the sooting can  
result in a fire causing death, serious injury, or property damage.  
Burner cleanInG  
In the event your burner or burner air openings require cleaning,  
turn the on/off switch to the “OFF” position and allow the unit to cool.  
Call a qualified service agency to remove and clean the burner and  
correct the problem that required the burner to be cleaned.  
At least once a year a visual inspection should be made of the venting  
system. You should look for:  
1. Obstructions which could cause improper venting. The combustion  
and ventilation air flow must not be obstructed.  
2. Damage or deterioration which could cause improper venting or  
leakage of combustion products.  
houseKeepInG  
Vacuum around base of water heater for dust, dirt, and lint on a  
regular basis.  
Be sure the vent piping is properly connected to prevent escape of  
dangerous flue gasses which could cause deadly asphyxiation.  
Obstructions and deteriorated vent systems may present serious  
health risk or asphyxiation.  
Chemical vapor corrosion of the flue and vent system may occur  
if air for combustion contains certain chemical vapors. Spray can  
propellants, cleaning solvents, refrigerator and air conditioner  
refrigerants, swimming pool chemicals, calcium and sodium chloride,  
waxes, bleach and process chemicals are typical compounds which  
are potentially corrosive.  
If after inspection of the vent system you found sooting or  
deterioration, something is wrong. Call the local gas utility to correct  
the problem and clean or replace the flue and venting before  
resuming operation of the water heater.  
Burner operatIon and InspectIon  
Flood damage to a water heater may not be readily visible or  
immediately detectable. However, over a period of time a flooded  
37  
INSTALLED IN SUITABLEAREA: To insure sufficient ventilation and  
combustion air supply, proper clearances from the water heater must  
be maintained. See “Facts to Consider About Location” section.  
Combustible materials such as clothing, cleaning materials, or  
flammable liquids, etc. must not be placed against or adjacent to  
the water heater which can cause a fire.  
When checking the temperature-pressure relief valve operation,  
make sure that (1) no one is in front of or around the outlet of the  
temperature-pressure relief valve discharge line, and (2) that the  
water discharge will not cause any property damage, as the water  
may be extremely hot, see Figure 28.  
If after manually operating the valve, it fails to completely reset and  
continues to release water, immediately close the cold water inlet  
to the water heater, follow the draining instructions, and replace the  
temperature-pressure relief valve with a new one.  
anode rod InspectIon  
If the temperature-pressure relief valve on the appliance weeps  
or discharges periodically, this may be due to thermal expansion.  
You may have a check valve installed in the water line or a water  
meter with a check valve. Consult your local water supplier or a  
qualified service agency for further information. Do not plug the  
temperature-pressure relief valve.  
The anode rod is used to protect the tank from corrosion. Most hot  
water tanks are equipped with an anode rod. The submerged rod  
sacrifices itself to protect the tank. Instead of corroding the tank,  
water ions attack and eat away the anode rod. This does not affect  
the water’s taste or color. The rod must be maintained to keep the  
tank in operating condition.  
draInInG  
Anode deterioration depends on water conductivity, not necessarily  
water condition. A corroded or pitted anode rod indicates high water  
conductivity and should be checked and/or replaced more often than  
an anode rod that appears to be intact. Replacement of a depleted  
anode rod can extend the life of your water heater. Inspection should  
be conducted by a qualified technician, and at a minimum should be  
checked annually after the warranty period.  
The water heater should be drained if being shut down during  
freezing temperatures. Also periodic draining and cleaning of  
sediment from the tank may be necessary.  
teMperature-pressure  
relIef valve operatIon  
1. Set the power switch to the “OFF” position.  
2. CLOSE the cold water inlet valve to the water heater.  
3. OPEN a nearby hot water faucet and leave open to allow for  
draining.  
4. Connect a hose to the drain valve and terminate to an adequate  
drain.  
5. OPEN the water heater drain valve to allow for tank draining.  
note: If the water heater is going to be shut down and  
drained for an extended period, the drain valve should be  
left open with hose connected allowing water to terminate  
to an adequate drain.  
6. CLOSE the drain valve.  
7. Follow instructions in the “Filling The Water Heater” section.  
8. Follow the lighting instructions on the label or see “Lighting  
Instructions” in this manual to restart the water heater.  
FIGURE 28.  
38  
servIce  
If you are not thoroughly familiar with gas codes, your water heater,  
and safety practices, contact your gas supplier or qualified installer  
If a condition persists or you are uncertain about the operation of  
the water heater contact a qualified service agency.  
to check the water heater.  
Read this manual first. Then before checking the water heater make  
sure the gas supply has been turned “OFF”, and never turn the gas  
“ON” before the tank is completely full of water.  
Use this guide to check a “Leaking” water heater. Many suspected  
“Leakers” are not leaking tanks. Often the source of the water can  
be found and corrected.  
leaKaGe checKpoInts  
Never use this water heater unless it is completely filled with water.  
To prevent damage to the tank, the tank must be filled with water.  
Water must flow from the hot water faucet before turning “ON” gas  
to the water heater.  
A
*Condensation may be seen on pipes in humid weather or pipe  
connections may be leaking.  
B. *The anode rod fitting may be leaking.  
C. Small amounts of water from temperature-pressure relief valve  
may be due to thermal expansion or high water pressure in your  
area.  
D. *The temperature-pressure relief valve may be leaking at the  
tank fitting.  
E. Water from a drain valve may be due to the valve being slightly  
opened.  
F. *The drain valve may be leaking at the tank fitting.  
G. Combustion products contain water vapor which can condense  
on the cooler surfaces of the tank. Droplets form and drip onto  
the burner or run on the floor. This is common at the time of  
start-up after installation and when incoming water is cold.  
H. Water in the water heater bottom or on the floor may be from  
condensation, loose connections, or the relief valve. DO NOT  
replace the water heater until a full inspection of all possible water  
sources is made and necessary corrective steps taken.  
Leakage from other appliances, water lines, or ground seepage  
should also be checked.  
*
To check where threaded portion enters tank, insert cotton  
swab between jacket opening and fitting. If cotton is wet, follow  
“Draining” instructions in the “Periodic Maintenance” section and  
then remove fitting. Put pipe dope or teflon tape on the threads  
and replace. Then follow “Filling the Water Heater” instructions  
in the “Installing the New Water Heater” section.  
39  
trouBleshootInG GuIdelInes  
These guidelines should be utilized by a qualified service agent.  
proBleMs  
1.) Blower will not run.  
a. “ON/OFF” control switch turned off.  
b. Blower unplugged.  
Turn switch to the “ON” position.  
Plug blower back into 115 VAC outlet.  
Repair service to outlet.  
c. No power at outlet.  
d. Thermostat defective.  
Replace thermostat.  
e. Control harness defective.  
Replace control harness.  
Reduce the water temperature below 140°F.  
Turn the power switch to the off position.  
Wait 10 seconds. Turn the power switch to  
the on position. Reduce the temperature set  
point to minimize likelihood of reoccurrence. If  
this does not solve the problem, replace the  
thermostat.  
f. High limit control circuit open.  
not enouGh hot water  
g. Blower motor defective.  
2.) Thermostat problems  
a. Thermostat set too low.  
b. Thermostat or ECO defective  
3.) Others  
Replace blower assembly.  
Adjust temperature control higher.  
Replace thermostat.  
a. Heater undersized..  
Reduce hot water use.  
b. Low gas pressure  
Contact dealer.  
c. Incoming water is usually cold.  
Allow more time for heater to reheat.  
d. Leaking hot water pipes of fixtures. Have plumber check and repair leaks.  
e. Heater not lit or thermostat not on. Refer to LIGHTING INSTRUCTIONS.  
VENT PIPE TOO HOT (ABOVE 170°F [77°C]) Wrong burner orifice.  
Turn off heater and gas, clean burner head.  
Turn off heater and gas, clean burner head.  
Dirt in burner ports.  
Check exhaust venting and air openings  
in bottom base pan for obstructions or  
blockage.  
Yellow flaMe  
Combustion air path restricted.  
condensatIon  
Water on the floor under heater.  
See CONDENSATION section.  
Improperly sealed, hot or cold supply  
connections, relief valve, drain valve or Check for leaks. See Figure 1.  
thermostat threads.  
water leaKs  
Leakage from other appliances or water lines. Inspect other appliances near water heater.  
Condensation of flue products.  
Refer to CONDENSATION section.  
Install thermal expansion tank (Do not plug  
T&P valve).  
Thermal expansion in closed water system.  
leaKInG t & p  
Check relief valve for proper operation (Do  
not plug T&P valve).  
Improperly sealed valve.  
High sulfate or mineral content in water  
supply.  
Drain and flush heater thoroughly then refill.  
Chlorinate water supply.  
hot water odors  
(refer to cathodic protection)  
Bacteria in water supply.  
Refer to TEMPERATURE REGULATION  
section.  
hot water too hot  
water heater sounds  
SIZZLING - RUMBLING  
sootInG  
Thermostat set too high.  
Condensation dripping on burner.  
Sediment at bottom of heater tank.  
Refer to CONDENSATION above.  
Clean sediment from tank. Refer to  
DRAINING.  
Improper combustion.  
Refer to Air Requirements.  
Test polarity and correct.  
Outlet polarity is reversed.  
Contact a qualified service agency to  
determine cause.  
Burner wIll not staY lIt-Goes out  
High ambient room temperature.  
4-5 SECONDS  
Defective gas control valve thermostat  
Lack of air supply.  
.
Replace gas control valve thermostat.  
Improperly installed vent piping.  
Downdraft  
Shut off water heater immediately and contact a  
qualified service agency to determine cause.  
vent Gas odors  
Poor Combustion  
40  
notes  
41  
notes  
42  
lIMIted resIdentIal Gas warrantY  
THIS WARRANTY IS APPLICABLE TO THE ORIGINAL OWNER ONLY If  
b. Shipping and delivery charges for forwarding the new water heater or  
replacement part from the nearest distributor and returning the claimed  
defective heater or part to such distributor except in the state of California  
where such charges are the manufacturer’s responsibility.  
c. All cost necessary or incidental for handling and administrative charges,  
and for any materials and/or permits required for installation of the  
replacement heater or part.  
the glass lined tank in this water heater shall prove upon examination by (the  
warrantor) to have leaked during the warranty period in normal residential  
use, due to natural corrosion from potable water therein, the warrantor will  
furnish the ORIGINAL OWNER a replacement water heater of equivalent  
size and current model, or a replacement part for any component part which  
fails in normal use, in accordance with the warranty terms and conditions  
specified below. THE WATER HEATER REPLACEMENT MODEL OR  
PART WILL BE WARRANTED FORONLYTHE UNEXPIRED PORTION OF  
THE ORIGINAL WARRANTY The warranty period will be determined by the  
original installation date of the water heater. PROOF-OF-PURCHASEAND  
PROOF-OF-INSTALLATION ARE NECESSARY TO VALIDATE THIS  
WARRANTY This warranty is not transferable.  
lIMItatIon on IMplIed warrantIes  
Implied warranties, including any warranty of merchantability imposed on  
the sale of this heater under state law are limited to one year duration for the  
heater or any of its parts. Some states do not allow limitations on how long  
an implied warranty lasts, so the above limitations may not apply to you.  
WARRANTY PERIOD  
claIM procedure  
Any claim under this warranty should be initiated with the dealer who sold  
the heater, or with any other dealer handling the warrantor’s products.  
product line  
tanK1  
parts2  
GDHE-50  
6 YEARS  
6 YEARS  
The warrantor will only honor replacement with identical or similar water  
heater or parts thereof which are manufactured or distributed by the  
warrantor.  
When the water heater has been used for other than single family residential  
application: 1. The Tank warranty shall be reduced to 3 years on 10 year  
models and 1 year on 6 and 8 year models. 2. The parts warranty shall  
be reduced to 1 year for all models. Returned parts which meet any of  
the following conditions are not covered by this warranty: 1) improper  
installation or removal; 2) damaged by other than normal wear; 3) replaced  
for cosmetic purposes; or 4) returned with defaced date codes.  
Dealer replacements are made subject to in-warranty validation by  
warrantor.  
PROOF-OF-PURCHASE AND PROOF-OF-INSTALLATION DATES ARE  
REQUIRED TO SUPPORT WARRANTY FOR CLAIM FROM ORIGINAL  
OWNER. THIS FORM DOES NOT CONSTITUTE PROOF-OF-PURCHASE  
OR PROOF-OF-INSTALLATION.  
condItIons and eXceptIons  
This warranty shall apply only when the water heater is installed and  
operated in accordance with: 1) all local fire codes and plumbing codes,  
ordinances and regulations; 2) the printed instructions provided with it; 3)  
good industry practices; and 4) proper safety practices such as but not  
limited to a properly sized drain pan if installed in an area where leakage  
from connections of the tank would result in damage to the area adjacent  
to the heater. In addition, a new temperature and pressure relief valve,  
certified by the Canadian Standards Association must have been properly  
installed and piped to the nearest drain.  
dIsclaIMers  
NO EXPRESS WARRANTY HAS BEEN OR WILL BE MADE IN BEHALF  
OF THE WARRANTOR WITH RESPECT TO THE MERCHANTABILITY  
OF THE HEATER OR THE INSTALLATION, OPERATION, REPAIR OR  
REPLACEMENT OF THE HEATER OR PARTS. THE WARRANTOR SHALL  
NOT BE RESPONSIBLE FOR WATER DAMAGE, LOSS OF USE OF THE  
UNIT,INCONVENIENCE,LOSSORDAMAGETOPERSONALPROPERTY,  
OR OTHER CONSEQUENTIAL DAMAGE. THE WARRANTOR SHALL  
NOT BE LIABLE BY VIRTUE OF THIS WARRANTY OR OTHERWISE FOR  
DAMAGE TO ANY PERSONS OR PROPERTY, WHETHER DIRECT OR  
INDIRECT, AND WHETHER ARISING IN CONTRACT OR IN TORT.  
This warranty shall apply only when the heater is:  
owned by the original purchaser;  
used at temperatures not exceeding the maximum calibrated setting of  
its thermostat;  
Some states do not allow the limitation or exclusion of incidental or  
consequential damages, so the above limitation or exclusion may not  
apply to you.  
notsubjectedtoexcessivewaterpressureuctuationsandnotsubjectto  
an operating pressure greater than 150 P.S.I.;  
filled with potable water, free to circulate at all times and with the tank  
free of damaging water sediment or scale deposits;  
used in a non-corrosive and non-contaminated atmosphere;  
used with factory approved anode(s) installed;  
in its original installation location;  
in the United States and its territories or possessions or Canada;  
sized in accordance with proper sizing techniques for residential  
water heaters;  
This warranty gives you specific legal rights, and you may also have other  
rights which vary from state to state. Should governmental regulations or  
industry standards prohibit the Manufacturer from furnishing a comparable  
model replacement under this warranty, the Owner will be furnished with  
the closest comparable water heater meeting the current governmental  
regulations and industry standards. A supplementary fee may be assessed  
to cover the additional cost associated with the changes made to meet  
applicable regulations and standards.  
bearing a rating plate which has not been altered, defaced or removed  
except as required by the warrantor;  
used in an open system or in a closed system with a properly sized and  
installed thermal expansion tank;  
fired at the factory rated input using the fuel stated in the face of the  
rating plate;  
operated with the inner and outer combustion chamber doors  
in place;  
Fill out and keep with water heater.  
IMportant InforMatIon  
maintained in accordance with the instructions printed in the manual  
included with the heater.  
Model Number _________________________________________  
Serial Number__________________________________________  
Installation Information:  
Any accident to the water heater or any part thereof (including freezing,  
fire, floods, or lightning), any misuse, abuse or alteration of it, any  
operation of it in a modified form, or any attempt to repair tank leaks or  
parts, will void this warranty.  
Date Installed __________________________________________  
Company’s Name ______________________________________  
Street or P.O. Box_______________________________________  
City, State, and Zip Code _________________________________  
Phone Number ____________ Plumber’s Name_______________  
servIce and laBor responsIBIlItY  
UNDER THIS LIMITED WARRANTY, THE WARRANTOR WILL  
PROVIDE ONLY A REPLACEMENT WATER HEATER OR PART  
THEREOF. THE OWNER IS RESPONSIBLE FOR ALL OTHER COSTS.  
Such costs may include but are not limited to:  
a. Labor charges for service, removal, or reinstallation of the water heater  
or part thereof.  
43  
500 Tennessee Waltz Parkway, Ashland City, TN 37015  
Phone: 800-527-1953 Fax: 800-433-2515  
www.hotwater.com  

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