GAS WATER HEATERS
RESIDENTIAL
OWNER'S MANUAL
DIRECT VENT
GAS MODELS
GDVH/GDVS/XDVS
Thank you for buying this energy efficient water heater from
A.O. Smith Water Products Company. We appreciate your
confidence in our products.
You should thoroughly read this manual before installation
and/or operation of this water heater. Please pay particular
attention to the important safety and operating instructions
as well as the WARNINGS and CAUTIONS.
TABLE OF CONTENTS
............................................................................. PAGE
GET TO KNOW YOUR WATER HEATER ...................... 2
GENERAL SAFETYINFORMATION ............................. 3
INSTALLATION ......................................................... 3-19
OPERATION ............................................................. 19-21
MAINTENANCE AND
TROUBLESHOOTING .............................................. 21-23
WARRANTY................................................................. 24
CAUTION
TEXT PRINTED OR OUTLINED IN RED CONTAINS
INFORMATION RELATIVE TO YOUR SAFETY. PLEASE READ
THOROUGHLY BEFORE INSTALLING AND USING THIS
APPLIANCE.
A DIVISION OF A.O.SMITH CORPORATION
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
PRINTED IN U.S.A. 0106
PART NO. 184961-001
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GET TO KNOW YOUR WATER HEATER
REPLACEMENT PARTS
TYPICAL INSTALLATION
Replacement parts may be ordered through authorized
servicers or distributors. Refer to the Yellow Pages for where to
call or contact A. O. Smith Water Products Company, 500
Tennessee Waltz Parkway, Ashland City, TN 37015,
1-800-433-2545. When ordering parts, provide complete
model and serial numbers (see rating plate), quantity and
name of part desired (as listed in Figure 1). Standard
hardware items may be purchased locally.
WARNING
DO NOT ATTEMPT TO OPERATE WATER HEATER WITH COLD
WATER INLET VALVE CLOSED.
THERMAL
EXPANSION TANK
VACUUM RELIEF
VALVE
INSTALL PER LOCAL
CODES.
INSTALLTHERMALEXPANSION
TANK IF WATER HEATER IS
INSTALLED IN
SYSTEM.
A
CLOSED
GAS PILOT & MAIN BURNER
(DO NOT CAP OR PLUG)
CERTAIN MODELS ARE
EQUIPPED WITH SIDE
PLUMBING CONNECTIONS
FOR SPACE HEATING. THE
HOT AND COLD FITTING
ASSEMBLIES (PART #900126-2)
CAN BE ORDERED THROUGH
THE MANUFACTURER.
THERMOSTAT
GAS CONTROL
ALL PIPING MATERIALS TO BE
SUPPLIED BY CUSTOMER.
FIGURE 1
2
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combustion, resulting in fire, asphyxiation, serious personal
injury or death.
GENERAL SAFETY
INFORMATION
•
•
•
Do not cover the outer door, thermostat or temperature &
pressure relief valve.
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 A.O. Smith
for placement on the blanket directly over the existing labels.
EXTERNAL DAMAGE
Do not operate the water heater until it has been fully checked out
by a qualified technician, if the water heater:
• Has been exposed to fire or damage.
• Displays evidence of sooting.
• Produces steam or unusually hot water.
INSTALLATION
If the water heater has been flooded it must be replaced.
REQUIRED ABILITY
CHEMICAL VAPOR CORROSION
INSTALLATION OR SERVICE OF THIS WATER HEATER
REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED
TRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR
SUPPLY, VENTING AND GAS SUPPLYARE REQUIRED.
WARNING
CORROSION OF THE FLUEWAYS AND VENT SYSTEM MAY
OCCUR IF AIR FOR COMBUSTION CONTAINS CERTAIN
CHEMICAL VAPORS. SUCH CORROSION MAY RESULT IN
FAILUREAND RISK OFASPHYXIATION.
INSPECT SHIPMENT
There may be hidden damage caused in transit. Check to be
certain all parts of the venting system, as listed below, are present.
CAUTION!!! IF THERE ARE ANY DAMAGED PARTS, DO NOT
INSTALL THIS WATER HEATER. REPORT ANY SHORTAGE TO
YOUR DISTRIBUTOR OR DAMAGE TO YOUR CARRIER.
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.
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.
(Refer to the limited warranty for complete terms and conditions).
VENT KIT ASSEMBLY COMPONENTS
1
1
1
1
3” 90° elbow
6” 90° elbow
3” tube
1
1
1
1
Finishing collar (inside)
Finishing collar (outside)
Terminal Vent Cap Assembly
Tube silicone sealant
6” tube
EXTENDED NON-USE PERIODS
GENERAL
The installation must conform to 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. The code is
available from the Canadian Standards Association, 8501 East
Pleasant Valley Road, Cleveland, OH 44131.
WARNING
HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER
SYSTEM SERVED BY THIS HEATER THAT HAS NOT BEEN USED
FOR A LONG PERIOD OF TIME (GENERALLY TWO WEEKS OR
MORE). HYDROGEN GAS IS EXTREMELY FLAMMABLE. To
reduce the risk of injury under these conditions, it is
recommended that the hot water faucet be opened for several
minutes at the kitchen sink before using any electrical appliance
connected to the hot water system. If hydrogen is present, there
will probably be an unusual sound such as air escaping through
the pipe as the water begins to flow. THERE SHOULD BE NO
SMOKING OR OPEN FLAME NEAR THE FAUCETATTHE TIME IT
IS OPEN.
FACTS TO CONSIDER ABOUT THE LOCATION
You should 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.
INSULATION BLANKETS
Whether replacing an old water heater or putting the water heater
in a new location, the following critical points must be observed.
Insulation blankets available to the general public for external use
on gas water heaters are not necessary with A. O. Smith products.
The purpose of an insulation blanket is to reduce the standby
heat loss encountered with storage tank water heaters. Your
A. O. Smith water heater meets or exceeds the National Appliance
Energy Conservation Act standards with respect to insulation and
standby loss requirements, making an insulation blanket
unnecessary.
When installing the heater, consideration must be given to proper
location. The water heater should be located as close to or
centralized to the water piping system as possible. The water
heater should be located in an area not subject to freezing
temperatures.
THE HEATER SHOULD BE LOCATED IN AN AREA WHERE
LEAKAGE OF THE TANK OR CONNECTIONS WILLNOTRESULTIN
DAMAGETO THEAREAADJACENTTOTHE HEATER ORTO LOWER
FLOORS OF THE STRUCTURE. When such locations cannot be
avoided, a suitable drain pan should be installed under the heater.
Such pans should have a minimum length and width of at least 2
WARNING
Should you choose to apply an insulation blanket to this heater,
you should follow these instructions (See Figure
identification of components mentioned below). Failure to follow
these instructions can restrict the air flow required for proper
1
for
3
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inches greater than the diameter of the heater and should be piped to
an adequate drain. Drain pans suitable for these heaters are
available from your dealer or A. O. Smith Water Products Company,
500 Tennessee Waltz Parkway, Ashland City, TN 37055. Contact us at
or fax: 1.800.433.2515.
WARNING
DO NOT INSTALL THIS WATER HEATER DIRECTLY ON A
CARPETED FLOOR. AFIRE HAZARD MAY RESULT. Instead the
water heater must be placed on a metal or wood panel extending
beyond the full width and depth by at least 3 inches (76.2mm) in
any direction. If the heater is installed in a carpeted alcove or
closet, the entire floor shall be covered by the panel.
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:
Refer to Figure 1 for typical installation. A suitable pipe thread
sealant must be used to prevent leakage.
WATER (POTABLE) HEATINGAND SPACE HEATING
1. All piping components connected to this unit for space heating
applications shall be suitable for use with potable water.
2. Toxic chemicals, such as those used for boiler treatment, shall
NEVER be introduced into this system.
3. This unit may NEVER be connected to any existing heating
system or component(s) previously used with a non-potable
water heating appliance.
4. When the system requires water for space heating at
temperatures higher than required for domestic water
purposes, a tempering valve must be installed, see Figure 2
for suggested piping arrangement.
•
•
•
•
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 home 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.
Under no circumstances is the manufacturer to be held liable for
any water damage in connection with this water heater.
FIGURE 2
CLOSED WATER SYSTEM
A closed system will exist if a back-flow preventer (check valve),
pressure reducing valve, or other similar device is installed in the
cold water line between the water heater and the street main (or
well). Excessive pressure may develop due to the thermal
expansion of heated water causing premature tank failure or
intermittent relief valve operation. This type of failure is not
covered by the limited warranty. An expansion tank may be
necessary in the cold water supply to alleviate this situation, see
Figure 1. Contact the local plumbing authority.
Vapors from flammable
liquids may explode and catch
fire causing death or severe
burns.
Water heater has a main burner
and pilot flame. The pilot flame:
1. is on all the time and
2. will ignite flammable vapors.
Do not use or store flammable
products such as gasoline,
solvents or adhesives in the same
room or area near the water heater.
Vapors:
If the temperature and pressure relief valve on the appliance
discharges periodically, this may be due to thermal expansion in a
closed water supply system. Contact the water supplier or local
plumbing inspector on how to correct this situation. DO NOT
PLUG THE TEMPERATUREAND PRESSURE RELIEF VALVE.
1. cannot be seen,
2. are heavier than air,
3. go a long way on the floor
and
4. can be carried from other
rooms to the pilot flame by
air currents.
Keep flammable products:
1. far away from heater,
2. in approved containers,
3. tightly closed and
GAS CONNECTIONS
4. out of children’s reach.
The minimum gas supply pressure for input adjustment is 5.0”
W.C. (1.2 kPa) for natural gas and 11.0” W.C. for propane gas.
THE HEATER IS NOT INTENDED FOR OPERATIONAT HIGHER
THAN 10.5” WATER COLUMN (2.6 kPa) SUPPLY PRESSURE.
EXPOSURE TO HIGHER GAS SUPPLY PRESSURE MAY CAUSE
DAMAGE TO THE CONTROL WHICH COULD RESULT IN FIRE
OR EXPLOSION. If over-pressure has occurred such as through
improper testing of gas lines or emergency malfunction of the
supply system, the control must be checked for safe operation.
Installation:
Do not install water heater where
flammable products will be stored
or used unless the main burner
and pilot flames are at least 18”
above the floor. This will
reduce, but not eliminate the
risk of vapors being ignited by
the main burner or pilot flame.
The location selection must provide adequate clearances for
servicing and proper operation of the water heater.
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Make sure that the outside vents on the supply regulators and the
safety vent valves are protected against blockage. These are
parts of the gas supply system not the heater. Vent blockage may
occur during ice storms.
not exceed the working pressure shown on the rating plate of the
heater. In addition, the hourly BTU rated temperature steam
discharge capacity of the relief valve shall not be less than the
input rating of the heater. NO VALVE IS TO BE PLACED BETWEEN
THE RELIEF VALVE AND TANK. DO NOT PLUG THE RELIEF
VALVE.
IT IS IMPORTANT TO GUARD AGAINST CONTROL FOULING
FROM CONTAMINANTS IN THE GAS WAYS. SUCH FOULING
MAY CAUSE IMPROPER OPERATION, FIRE OR EXPLOSION.
The drain line connected to this valve must not contain a reducing
coupling or other restriction and must terminate near a suitable
drain to prevent water damage during valve operation. The
discharge line shall be installed in a manner to allow complete
drainage of both the valve and line. DO NOT THREAD, PLUG OR
CAP THE END OF THE DRAIN LINE.
All piping must comply with local codes and ordinances or with
the current edition of National Fuel Gas Code (ANSI Z223.1/
NFPA-54) whichever applies.
REFER TO FIGURE 1 FOR CONNECTION DETAILS. BEFORE
ATTACHING THE GAS LINE BE SURE THAT ALL GAS PIPE IS
CLEAN ON THE INSIDE.
VENTING
WARNING
TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS
SUPPLY LINE, A DIRT LEG (SOMETIMES CALLED DRIP LEG)
MUST BE INCORPORATED IN THE PIPING, FIGURE 1. The dirt
leg must be readily accessible. Install in accordance with
recommendations of serving gas supplier. Refer to the latest
edition of the National Fuel Gas Code ANSI Z223.1.
NEVER OPERATE THE HEATER UNLESS IT IS VENTED TO THE
OUTDOORS AND HAS ADEQUATE AIR SUPPLY TO AVOID
RISKS OF IMPROPER OPERATION, FIRE, EXPLOSION OR
ASPHYXIATION.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND
VENTILATING AIR. ADEQUATE AIR FOR COMBUSTION AND
VENTILATION MUST BE PROVIDED FOR SAFE OPERATION.
To prevent damage, care must be taken not to apply too much
torque when attaching gas supply pipe to thermostat gas inlet.
The thermostat inlet has a pad for use with a backup wrench.
VENT PIPE TERMINATION
Apply joint compounds (pipe dope) sparingly and only to the male
threads of pipe joints. Do not apply compound to the first two
threads. Use compounds resistant to the action of liquefied
petroleum gases. Do not use teflon tape on thermostat fittings.
Before installing water heater determine placement of vent pipe
termination.
MAKE CERTAIN TO OBSERVE VENT LOCATION LIMITATION,
SEE FIGURES 4 & 5.
DISCONNECT THE APPLIANCE FROM THE GAS SUPPLY
PIPING SYSTEM DURING ANY SUPPLY PRESSURE TESTING
EXCEEDING 1/2 PSI (3.5 kPa). GAS SUPPLY LINE MUST BE
CAPPED WHEN DISCONNECTED FROM THE HEATER. FOR
TEST PRESSURES AT 1/2 PSI (3.5 kPa) OR LESS, THE
APPLIANCE NEED NOT BE DISCONNECTED, BUT MUST BE
ISOLATED FROM THE SUPPLY PRESSURE TEST BY CLOSING
THE MAIN MANUALGAS VALVE.
CAUTION
Use only the vent kit assembly supplied with this water heater or if
needed one of the three listed optional flue extensions. See
Figure 10 for possible combinations.
VENTING OR
TERMINATION WITH ANY OTHER KIT NOT LISTED IS NOT
RECOMMENDED AND COULD AFFECT THE SYSTEMS
PERFORMANCEAND RESULT INASAFETY HAZARD.
WARNING
MINIMUM CLEARANCES BETWEEN THE WATER HEATERAND
COMBUSTIBLE AND NONCOMBUSTIBLE CONSTRUCTION
ARE: 0 INCHES FROM SIDES, 0 INCHES FROM BACK, 4 INCHES
FROM FRONT OF JACKET TO CLOSET DOOR AND 3 INCHES
FROM TOP OF JACKET TO COMBUSTIBLE AND
NONCOMBUSTIBLE MATERIAL. MINIMUM VENT CLEARANCE: 0
INCHES. PROVIDE 24 INCHES FRONT CLEARANCE FOR
SERVICING AND ADEQUATE CLEARANCE BETWEEN THE
JACKETTOP & CEILING FOR SERVICING THE FLUEAREA, SEE
FIGURES 3AND 3A.
BEFORE PLACING THE HEATER IN OPERATION, CHECK
FOR GAS LEAKAGE. USE SOAPAND WATER SOLUTION OR
OTHER MATERIAL ACCEPTABLE FOR THIS PURPOSE. DO
NOT USE MATCHES, CANDLES, FLAME OR OTHER
SOURCES OF IGNITION TO LOCATE GAS LEAKS.
RELIEF VALVE
A NEW TEMPERATURE AND PRESSURE RELIEF VALVE
COMPLYING WITH THE STANDARD FOR RELIEF VALVES AND
AUTOMATIC GAS SHUT OFF DEVICES FOR HOT WATER
SUPPLY SYSTEMS, ANSI Z21.22 (CURRENT EDITION) MUST
BE INSTALLED IN THE HEATER IN THE MARKED OPENING
PROVIDED, SEE FIGURE 1. THE VALVE MUST BE OF A SIZE
(INPUT RATING) THAT WILL BE ADEQUATE FOR YOUR SIZE
HEATER.
Check the metal tag on the relief valve and compare it to the
heater’s rating plate. The pressure rating of the relief valve must
FIGURE 3
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FIGURE 3A
FIGURE 4
COMBUSTION AIRAND VENTILATION
WARNING
When determining the installation location for a direct vent
water heater, snow accumulation and drifting should be
considered in areas where applicable.
Vent termination must not be within 4 feet of any items such as
gas meters, gas valves or other gas regulating equipment.
OPTIONAL WIRE GRILL
VENTING CLEARANCES
When the water heater vent cap is low enough to be touched
accidentally, or is accessible to small children, installation of a
protective vent cover is recommended. Some local codes may
require a vent cap cover. Figure 9 shows the optional wire vent
cap protector available from the water heater manufacturer.
•
•
•
•
•
•
•
•
18” minimum in all directions from any obstruction that may
interfere.
18” minimum from the ground and 12” from ceiling
overhangs, see Figure 4.
A wire mesh chain link fence (as shown in Figure 9) may be
used instead of the factory cover. Care should be taken to
maintain adequate ventilation around the vent cap. If a chain
link fence is installed, it must not be used as a storage area for
items that may block proper ventilation.
The direct vent terminal shall terminate at least 3 feet above
any forced air inlet located within 10 feet, see Figure 5.
9” minimum horizontally from or above any door, window or
gravity air inlet into the building (50,000 BtuH input or less.)
12” minimum horizontally from or above any door, window or
gravity air inlet into the building (over 50,000 BtuH input).
12” minimum below any door, window or gravity air inlet into
the building (50,000 BtuH input or less).
18” minimum below any door, window or gravity air inlet into
the building (over 50,000 BtuH input).
18” minimum from other gravity or natural appliance outlet
vents when directly above or 135° to either side of center
line, see Figure 6.
•
•
•
36” minimum from any outlet vents when directly below or
45° to either side of center line, see Figure 7.
36” minimum in all directions from any other forced air
appliance outlet vent, see Figure 7.
The location selection must provide clearances for
servicing and proper operation of the water heater, see
Figure 8.
•
Vent termination must not be within 4 feet of any items such
as gas meters, gas valves or other gas regulating
equipment.
FIGURE 5
6
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FLUE EXTENSIONS
There are three optional extension kits available. Any
combination of the three kits can be chosen; however, only one
kit can be used vertically and/or horizontally, see Figures 10
and 11.
WARNING
At no time can more than one Vertical and/or one Horizontal
Vent Kit be used.
Unless otherwise specified at the time of ordering, a standard
extension kit is individually packaged and shipped within the
water heater carton.
POSSIBLE EXTENSION COMBINATIONS
FIGURE 6
FIGURE 7
FIGURE 10
FIGURE 8
FIGURE 9
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FIGURE 11
7
TABLE 2.
VERTICAL (EXTENSION KIT) HEIGHT
E DIMENSIONS
40-50 Gal. 75 Gal.
It is simple to determine which kit is needed for vertical height.
Take the total height (to the top of the flue) required and
comparing that to “F DIMENSION” in TABLE 1, it can be
determined which kit needs to be used vertically.
VENT KITS
MIN.
3-1/2
10
MAX.
10
MIN.
7/8
MAX.
7-3/8
900068-7-STD.
900124-6
15-1/2
26-1/2
48
7-3/8
12-7/8
23-7/8
12-7/8
23-7/8
45-3/8
900124-7
15-1/2
26-1/2
WARNING
900124-8
Obstructions and deteriorated vent systems may present
serious health risk or asphyxiation.
*BTU’S in
1000’s
NAT/L.P.
*GAL.
CAP.
A
B
C
40
50
40
50
75
36/36
38/38
40/40
48/44
55 NAT.
48-3/4
41-3/4
50-1/2
41-3/4
54
21
21
21
21
26-1/4
57-1/2
48-3/4
61
63
54-3/4
*See models and rating plate attached to the water heater for
specific model number and other detailed information.
WARNING
Be sure vent pipe is properly connected to prevent escape of
dangerous flue gases which could cause deadly asphyxiation.
ALL INSTALLATIONS
For ease of assembly the installation of the various kit
combinations has been broken into individual sections.
The two steps below are common to all installations. Once
these have been performed, you need only to refer to the
type installation that pertains to you.
Installation Using Vent Kits:
FIGURE 12
1. Standard Vent Kit ..................................... Page 8
TABLE 1.
2. Optional Vertical Vent Kit ....................... Page 10
with Standard Vent Kit
BTU’s
*GAL. in 1000’s900068-7 900124-6
CAP. NAT/L.P. STD. MIN. MAX. MIN. MAX. MIN.
72 77 77 88 88
FDIMENSION
3. Optional Horizontal Vent Kit ................... Page 13
900124-7
900124-8
4. Optional Horizontal and .......................... Page 15
Vertical Vent Kits
MAX.
110
40
50
40
50
36/36
38/38
40/40
48/44
63-3/4
72
80-3/4 86 86-1/4 97-1/4 97-1/4 118-3/4
72 77 77 88 88 110
84-1/4 89-3/4 89-3/4 100-3/4 100-3/4 122-3/4
63-3/4
76
CUTTING THE OPENING THROUGH
THE OUTSIDE WALL
75 55 NAT. 76-1/4 84-1/2 89-1/2 89-1/2 100-1/2 100-1/2 122-1/2
* See models and rating plate attached to the water heater for
specific model number and other detailed information.
After thoroughly reading the “Locating the New Water Heater”
section of this manual and you have chosen a suitable water
heater installation site, use the chart below to determine
dimensions for the opening in the wall.
HORIZONTAL (EXTENSION KIT)
Cut a 61/4” diameter hole completely through the outside wall.
To determine the horizontal length and extension kit needed,
simply plug the dimensions “D” and “G” into the equation
below. The answer “E” should then be located in TABLE 2. The
size range in which “E” dimension falls indicates the kit that
should be used horizontally to obtain the desired length.
EQUATION: D + G = E
“D” = The wall thickness
“G” = The distance wanted between the edge of the water
heater and the inside edge of the wall
FIGURE 13
“E” = The distance the extension kit must be able to extend
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4. First remove the 3” horizontal extension from the elbow.
Starting with the long end (with four securing holes), place
the 6” diameter vent elbow over the 3” diameter elbow.
Bend the round end “oval” to fit the flared oval end of the
jacket top.
WATER HEATER ATTITUDE
There is a certain amount of variation permissible with regard
to the direction the water heater faces.
Standing in front of the water heater (gas control facing you), set
the 3” diameter elbow (slotted end) on the flue. This will give
you a better understanding of the relation of the vent assembly
to the opening in the wall and more importantly any possibly of
interference of venting and water piping.
The direction of the water heater can now be made. Also
consider the gas control valve to insure installation, lighting,
and maintenance accessibility are retained.
FIGURE 18
5. Making sure the 6” diameter elbow is centered around the
3” diameter flue, secure the 6” diameter vent pipe using
four sheet metal screws at the connection of the jacket top.
STANDARD VENT KIT INSTALLATION #1
V
* Each part is stamped with a
part number.
FIGURE 19
FIGURE 14
The opening through the wall should be cut at this time. If it
hasn’t been, refer back to that section.
6. The standard vent kit includes a 6” diameter extension pipe
which is used when “E” dimension is over 6 1/2”.
1. Lock the elbow to the straight 3” flue pipe. Set this assembly
in place on the end of the water heater’sflue collar.
FIGURE 15
2. Mark the flue collar at the slots in the elbow. Using a #22 drill
bit, drill holes into the flue collar at the two
slots and secure the elbow to the flue collar using the
screws provided.
NOTE: Make sure elbow is properly aligned to opening in
the outside wall.
FIGURE 20
7. If “E” is less than 6 1/2” move to next step.
If “E” dimension is over 6 1/2”, assemble the 6” diameter
extension pipe (crimped end) to the 6” diameter vent elbow
and secure using two sheet metal screws.
FIGURE 16
3. Using the tube of sealant supplied, run an ample amount
around the oval flare of the jacket.
FIGURE 17
FIGURE 21
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8. Slide the vent collar (to be installed later) over the 6” vent
elbow.
FIGURE 26
12. Four wood screws are supplied to temporarily attach the
collar to the exterior wall of the building. However, other types
of screws may have to be substituted depending on the
material used in the construction of the exterior wall.
FIGURE 22
9. Place the water heater at the opening in the wall, at the
predetermined clearance.
FIGURE 27
13. Insert the 3” diameter flue extension pipe into the vent
collar assembly (flared & notched end first) and lock (turn
clockwise to lock studs to slots) the flue extension pipe to
the flue elbow.
FIGURE 28
FIGURE 23
14. Connect the vent cap by sliding its end over the 3” diameter
extension pipe and O-ring.
10. Move outdoors with all the remaining vent parts. Using the
tube of sealant supplied, run an ample amount on the inside
surface of the collar assembly that will contact the exterior wall
and also fill the bead on the end of the 6” diameter vent collar.
NOTE: To facilitate ease of assembly of the vent cap to the
3” pipe, a soap solution can be applied to the O-ring
gasket.
FIGURE 24
FIGURE 29
11. Install the vent collar assembly through the wall,
connecting it to the extension and/or elbow (depending on
which one was used).
15. The vent cap has 4 holes around the outer edge. Remove
the 4 screws used to temporarily attach the collar to the
exterior wall. Then secure the vent cap assembly with the
vent collar assembly to the exterior wall using the same 4
screws.
NOTE: Screws are supplied; however, substitution may be
necessary depending on the exterior wall material
.
CAUTION
To prevent unlocking the previously installed 3” diameter
extension, the vent cap assembly must be rotated in a
clockwise motion when the vent cap is installed.
FIGURE 25
10
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16. Go back indoors to attach inside collar to the inside wall.
Place the collar against the wall. Secure to wall by using 4
long sheet metal screws.
Use the simple equation below, chart and drawing
to find the length of expansion of the telescoping flue sections.
Because of manufacturing tolerances, place the telescoping
extension on the water heater and adjust the height
(“X” Dimension) and mark the point. Once the length has been
determined, lock the two sections together by drilling two holes
(180° apart) in the pipe and securing with the screws supplied.
EQUATION: C - A -10” = X
*GALLON
CAPACITY
*BTU’s in 1000’s
NAT/L.P.
36/36
A
40
50
40
50
75
48-3/4
57-1/2
48-3/4
61
FIGURE 30
38/38
40/40
48/44
55 NAT.
NOTE: Screws are supplied; however, substitution may be
necessary depending on the interior wall material.
63
17. Using the tube of sealant supplied, run an ample amount
of sealant around the edge of the vent pipe where it is
inserted through the inside collar to seal air drafts from
wall.
*
See models and rating plate attached to the water heater for
specific model number and other detailed information.
FIGURE 31
OPTIONAL VERTICAL VENT KIT # 900124-6 WITH
STANDARD HORIZONTAL VENT KIT INSTALLATION #2
FIGURE 34
NOTE: EACH PART HAS BEEN STAMPED WITHA PART NUMBER.
2. Set the vertical (3” diameter) telescoping flue section in
place on the flue collar. Using a #22 drill bit, drill two holes
(180° apart) and secure the vertical assembly to the flue
collar.
ANY OPTIONAL VENT KIT
FIGURE 32
The opening through the wall should be cut at this time. If it
hasn’t been, refer back to that section.
1. First it must be determined how far the vertical (3” dia.)
telescoping flue sections are set and locked together
using the two screws supplied as shown below.
FIGURE 35
3. Slide the 6” vent telescoping section apart to reveal the
beads. Using the caulking supplied, fill the beads.
FIGURE 36
FIGURE 33
11
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8. Making sure the 6” diameter elbow is centered around the
3” diameter flue, secure the 6” diameter vent pipe using
two sheet metal screws at the connection of the elbow and
6” vertical extension.
4. Using the tube of sealant supplied, run an ample amount
around the oval flare of the jacket.
FIGURE 37
5. Place the 6” vent section over the 3” flue section. Subtract
3/4” from the X dimension used earlier and this gives the
length of the 6” vent extension. Slide the 6” vent extension
apart to this dimension and lock it together using the two
screws supplied.
FIGURE 41
9. The standard vent kit includes a 6” diameter extension pipe
which is used when “E” dimension over 6 1/2”.
FIGURE 38
6. Bend the round end of the 6” vent extension oval at the
jacket top and secure it using four sheet metal screws.
FIGURE 42
10. If “E” Dimension is less than 6 1/2” move to next step.
If “E” dimension is over 6 1/2”, assemble the 6” diameter
extension pipe to the 6” diameter vent elbow and secure
using two sheet metal screws. Using the tube of sealant
supplied, run an ample amount around the joint to insure a
good seal.
FIGURE 39
7. Place the 3” elbow on the flue extension.
NOTE: Make sure elbow is properly aligned to opening in
the outside wall.
FIGURE 43
Mark the 3” dia. end of the flue extension at the slots the
elbow. Using a #22 drill bit, drill holes into the flue
extension at the two slots and secure the elbow to the flue
extension using the screws provided.
11. Slide the vent collar (to be installed later) over the 6” vent
elbow.
FIGURE 40
FIGURE 44
12
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12. Place the water heater at the opening in the wall, at the
predetermined clearance.
17. Connect the vent cap by sliding its end over the 3” diameter
extension pipe and O-ring.
NOTE: To facilitate ease of assembly of the vent cap to the
3” pipe, a soap solution can be applied to the O-ring
gasket.
FIGURE 50
FIGURE 45
18. The vent cap has 4 holes around the outer edge. Remove
the 4 screws used to temporarily attach the collar to the
exterior wall. Then secure the vent cap assembly with the
vent collar assembly to the exterior wall using the same 4
screws.
13. Move outdoors with all the remaining vent parts. Using the
tube of sealant supplied, run an ample amount on the inside
surface of the collar assembly that will contact the exterior wall
and also fill the bead on the end of the 6” diameter vent collar.
NOTE: Screws are supplied; however, substitution may be
necessary depending on the exterior wall material.
CAUTION
To prevent unlocking the previously installed 3” diameter
extension, the vent cap assembly must be rotated in a
clockwise motion when the vent cap is installed.
FIGURE 46
19. Go back indoors to attach inside collar to the inside wall.
Place the collar against the wall. Secure to wall by using 4
long sheet metal screws.
14. Install the vent collar assembly through the wall,
connecting it to the extension and/or elbow (depending on
which one was used).
NOTE: Screws are supplied; however, substitution may be
necessary depending on the interior wall material.
FIGURE 47
15. Four wood screws are supplied to temporarily attach the
collar to the exterior wall of the building. However, other
types of screws may have to be substituted depending on
the construction of the exterior wall.
FIGURE 51
20. Using the tube of sealant supplied, run an ample amount
of sealant around the edge of the vent pipe where it is
inserted through the inside collar to seal air drafts from
wall.
FIGURE 48
16. Insert the 3” diameter flue extension pipe into the vent
collar assembly (flared & notched end first) and lock (turn
clockwise to lock studs to slots) the flue extension pipe to
the flue elbow.
FIGURE 52
FIGURE 49
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OPTIONAL HORIZONTAL VENT KIT #900124-7
INSTALLATION #3
FIGURE 57
5. Making sure the 6” diameter elbow is centered around the
3” diameter flue, secure the 6” diameter vent pipe using
four sheet metal screws at the connection of the jacket top.
* Each part is stamped with a part number.
FIGURE 53
The opening through the wall should be cut at this time. If it
hasn’t been, refer back to that section.
FIGURE 58
1. Lock the elbow to the straight 3” flue pipe. Set the
assembly in place on the end of the water heater’s flue
collar.
6. The standard kit includes a single piece of 3” flue and 6” vent
pipe which will not be used in conjunction with the horizontal
kit.
FIGURE 59
7. Slide the vent collar (to be installed later) over the 6” vent
elbow.
FIGURE 54
2. Mark the flue collar at the slots in the elbow. Using a #22
drill bit, drill holes into the flue collar at the two slots and
secure the elbow to the flue collar using the screws
provided.
NOTE: Make sure elbow is properly aligned to opening in
the outside wall.
FIGURE 60
8. Place the water heater at the opening in the wall, at the
predetermined clearance.
FIGURE 55
3. Using the tube of sealant supplied, run an ample amount
around the oval flare of the jacket.
FIGURE 56
4. First remove the 3” horizontal extension from the elbow.
Starting with the long end (with four securing holes), place
the 6” diameter vent elbow over the 3” diameter elbow.
Bend the round end “oval” to fit the flared oval end of the
jacket top.
FIGURE 61
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9. Slide the 6” telescoping vent section apart to reveal the
beads.
14. Place the vent cap in the vent collar assembly.
NOTE: The section of 6” pipe with beads will connect to the
elbow. Using the caulking supplied, fill the beads.
FIGURE 67
15. The vent cap has 4 holes around the outer edge. Remove
the 4 screws used to temporarily attach the collar to the
exterior wall. Then secure the vent cap assembly with the
vent collar assembly to the exterior wall using the same 4
screws.
FIGURE 62
10. Insert the 6” telescoping vent section into the wall.
NOTE: Screws are supplied; however, substitution may be
necessary depending on the exterior wall material.
16. Move indoors to complete the assembly process.
FIGURE 63
11. Move outdoors with all the remaining vent parts. Using the
tube of sealant supplied, run an ample amount on the inside
surface of the collar assembly that will contact the exterior
wall and also fill the bead on the end of the 6” diameter vent
collar.
FIGURE 68
17. Collapse the 6” flue extension assembly as shown and
install the 3” extension by first slipping the end with the
O-ring approximately 1 1/4” into the end of the vent cap.
Lock the other end of the 3” extension to the studs in the
elbow.
NOTE: To facilitate ease of assembly of the vent cap to the
3” pipe, a soap solution can be applied to the O-ring
gasket.
FIGURE 64
12. Install the vent collar assembly through the wall,
connecting it to the 6” telescoping extension. Remember,
the extension is not connected yet and it may be necessary
to go back indoors and push it back up for a tight fit to the
collar.
FIGURE 65
13. Four wood screws are supplied to temporarily attach the
collar to the exterior wall to the building. However, other
types of screws may have to be substituted depending on
the construction of the exterior wall.
FIGURE 69
18. Using a #22 drill bit, drill holes 180° apart at the connection
point of the two 3” flue extensions. Then using 2 screws
provided, lock these pipes together.
FIGURE 66
15
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FIGURE 70
19. Now the 6” vent extension pipes can be expanded to
connect at the vent elbow.
FIGURE 74
Use the simple equation below, chart and drawing to find the
length of expansion of the telescoping flue sections. Because
of manufacturing tolerances, place the telescoping extension
on the water heater and adjust the height (“X” Dimension) and
mark the point. Once the length has been determined, lock the
two sections together by drilling two holes (180° apart) in the
pipe and securing with the screws supplied.
FIGURE 71
EQUATION: C - A - 10” = X
20. Pull the vent collar from the elbow to be against the wall
and secure it using the screws provided.
*GALLON
CAPACITY
*BTU’s in 1000’s
NATURAL
36/36
A
40
50
40
50
75
48-3/4
57-1/2
48-3/4
61
38/38
40/44
48/44
55 NAT.
63
FIGURE 72
21. Lock the 6” vent extension to the vent elbow by using two
screws provided, placing them 180° apart.
OPTIONAL VERTICAL AND
HORIZONTAL VENT KIT #900124-8
INSTALLATION #4
* See models and rating plate attached to the water heater for
specific model number and other detailed information.
FIGURE 75
2. Set the vertical (3” dia.) telescoping flue section in place
on the flue collar. Using a #22 drill bit, drill two holes (180°
apart) and screw the vertical assembly to the flue collar.
* Each part is stamped with a part number.
FIGURE 73
The opening through the wall should be cut at this time. If the
opening has not been cut, refer back to that section.
FIGURE 76
1. First it must be determined how far the vertical (3” dia.)
telescoping flue sections are set and locked together
using the two screws supplied as shown below.
3. Slide the 6” vent telescoping section apart to reveal the
beads. Using the caulking supplied, fill the beads.
16
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8. The standard kit includes a single piece of 3” flue and 6”
vent pipe which will not be used in conjunction with the
optional horizontal kit.
FIGURE 82
FIGURE 77
9. Making sure the 6” diameter elbow is centered around the
3” diameter flue, secure the 6” diameter vent pipe using
two sheet metal screws at the connection of the elbow and
6” vertical extension.
4. Using the tube of sealant supplied, run an ample amount
around the oval flare of the jacket.
FIGURE 78
FIGURE 83
5. Place the 6” vent section over the 3” flue section. Subtract
3/4” from the X dimension used earlier and this gives the
length of the 3” vent extension. Slide the 6” vent extension
apart to this dimension and lock it together using the two
screws supplied.
10. Slide the vent collar (to be installed later) over the 6” vent
elbow.
11. Place the water heater at the opening in the wall, at the
predetermined clearance.
FIGURE 79
6. Bend the round end of the 6” vent extension oval at the
jacket tip and secure it using four sheet metal screws.
FIGURE 80
FIGURE 84
7. Place the 3” elbow on the flue extension.
12. Slide the 6” telescoping vent section apart to reveal the
beads.
NOTE: Make sure elbow is properly aligned to opening in
the outside wall.
NOTE: The 6” pipe with beads will connect to the elbow.
Using the caulking supplied, fill the beads.
Mark the 3” dia. end of the flue extension at the slots in the
elbow. Using a #22 drill bit, drill holes into the flue extension at
the two slots and secure the elbow to the flue extension using
the screws provided.
FIGURE 85
13. Insert the 6” telescoping vent section into the wall.
FIGURE 81
17
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18. The vent cap has 4 holes around the outer edge. Remove the
4 screws used to temporarily attach the collar to the exterior
wall. Then secure the vent cap assembly with the vent collar
assembly to the exterior wall using the same 4 screws.
NOTE: Screws are supplied; however, substitution may be
necessary depending on the exterior wall material.
FIGURE 86
14. Move outdoors with all the remaining vent parts. Using the
tube of sealant supplied, run an ample amount on the
inside surface of the collar assembly that will contact the
exterior wall and also fill the bead on the end of the 6”
diameter vent collar.
FIGURE 91
19. Move indoors to complete the assembly process.
20. Collapse the 6” vent extension pipes as shown below and
install the 3” extension by first slipping the end with the
O-ring approximately 1 1/4” into the end of the vent cap.
Lock the other end of the 3” extension assembly to the
studs in the elbow.
FIGURE 87
15. Install the vent collar assembly through the wall,
connecting it to the 6” telescoping extension. Remember,
the extension is not connected yet and it may be necessary
to go back indoors and push it back up for a tight fit to the
collar.
FIGURE 92
NOTE: To facilitate ease of assembly of the vent cap to the
3” pipe, a soap solution can be applied to the O-ring
gasket.
FIGURE 88
16. We have supplied 4 wood screws to temporarily attach the
collar to the exterior wall of the building. However, other
types of screws may have to be substituted depending on
the construction of the exterior wall.
FIGURE 93
21. Using a #22 drill bit, drill holes 180° apart at the connection
point of the two 3” flue extensions. Then using 2 screws
provided, lock these pipes together.
FIGURE 89
17. Place the vent cap in the vent collar assembly.
FIGURE 94
22. Now the 6” vent extension pipes can be expanded to
connect at the vent elbow.
FIGURE 95
FIGURE 90
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FILLING
23. Pull the vent collar from the elbow to be against the wall
and secure it using the screws provided.
1. Close the heater drain valve (Fig. 1) by turning handle
clockwise.
2. Open a nearby hot water faucet to permit the air in the
system to escape.
3. Fully open the cold water inlet pipe valve (Fig. 1) allowing the
heater and piping to be filled.
FIGURE 96
4. Close the hot water faucet as water starts to flow.
5. The heater is ready to be operated.
24. Lock the 6” vent extension to the vent elbow by using two
screws provided, placing them 180° apart.
HIGH ALTITUDE INSTALLATIONS
WARNING
INSTALLATIONSABOVE 2,000 FT. REQUIRE REPLACEMENT OF
THE BURNER ORIFICE INACCORDANCE WITH THE NATIONAL
FUEL GAS CODE (ANSI Z223.1/NFPA 54). FAILURE TO
REPLACE THE ORIFICE COULD RESULT IN IMPROPER AND
INEFFICIENT OPERATION OF THE APPLIANCE, PRODUCING
CARBON MONOXIDE GAS IN EXCESS OF SAFE LIMITS, WHICH
COULD RESULT IN SERIOUS PERSONAL INJURY OR DEATH.
CONTACT YOUR GAS SUPPLIER FOR ANY SPECIFIC
CHANGES WHICH MAY BE REQUIRED IN YOUR AREA.
FIGURE 97
T & P VALVE AND PIPE INSULATION
Remove insulation for T & P valve and pipe connections from
carton.
A. O. Smith builds models specifically for high altitude service.
Please check the rating plate before making changes.
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.
TEMPERATURE REGULATION
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.
DANGER
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 PAINFUL
SCALDING WITH POSSIBLE SERIOUS AND PERMANENT
INJURY. 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.
FIGURE 98
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. Suitable covers are available through A.O. Smith
Water Products Company, 500 Tennessee Waltz Parkway,
Ashland City, TN 37015. Phone: 1-800-433-2545, fax: 1-800-
OPERATION
NEVER OPERATE THE HEATER WITHOUT FIRST BEING
CERTAIN IT IS FILLED WITH WATERANDATEMPERATUREAND
PRESSURE RELIEF VALVE IS INSTALLED IN THE RELIEF VALVE
OPENING OF THE HEATER. DO NOT ATTEMPT TO OPERATE
HEATER WITH COLD WATER INLET VALVE CLOSED.
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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.
A. This appliance has a pilot which is lit by a piezo-electric
• If you cannot reach your gas supplier, call the fire
department.
spark gas ignition system. Do not remove the access
doors of the appliance and try to light the pilot by hand.
B. BEFORE LIGHTING 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 SMELLGAS
C. Use only your hand to push in or turn the gas control
knob. Never use tools. If the knob will not push in or
turn by hand, don’t try to repair it, 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 call 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.
LIGHTING INSTRUCTIONS
1. STOP! Read the safety information above on this label.
2. Set the thermostat to lowest setting (PILOT LIGHTING).
7. Depress the gas control knob all the way down.
Immediately depress the piezo ignitor button until a
click is heard and then release. Check to see if pilot is
lit through the observation port. If pilot is not lit, continue
to depress and release piezo ignitor button up to six (6)
times. If pilot is still not lit, repeat steps 3 through 7.
After the pilot is lit, continue to hold control knob down for
about one (1) minute. Release knob and it will pop
back up. Pilot should remain lit. If it goes out repeat
steps 2 through 7.
Turn the thermostat dial fully clockwise (
it stops as shown.
) until
3. Turn gas control knob clockwise
to “OFF”
position. Knob cannot be turned from “PILOT” to “OFF”
unless knob is depressed slightly. DO NOT USE FORCE.
4. Wait five (5) minutes to clear out any gas. If you then smell
gas, STOP! Follow “B” in the safety information above on
this label. If you don’t smell gas, go to the next step.
• If knob does not pop up when released, stop and
immediately call your service technician or gas supplier.
• If the pilot will not stay lit after several tries, depress
and turn the gas control knob clockwise
“OFF” and call your service technician or gas supplier.
8. Turn gas control knob counter-clockwise to the
to
5. If you don’t smell gas, turn knob on gas control counter
clockwise
to “PILOT” position.
6. Pilot can be viewed through observation port. Note location
of piezo ignitor.
full “ON” position. WARNING Do not use gas
control knob to regulate gas flow.
9. Set the thermostat to desired setting. The mark (
)
indicative of approximately 120°F is preferred starting
point. Some local laws may require a lower starting
point. If hotter water is desired, see instruction
manual and “warning” below.
WARNING
Hotter water increases the risk of scald injury. Before changing temperature setting see instruction manual.
TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to lowest setting
(PILOT LIGHTING). Turn the thermostat
2. Turn gas control knob clockwise
to “OFF”
position. Knob cannot be turned from “PILOT” to
“OFF” unless knob is depressed slightly. DO NOT
FORCE
dial fully clockwise (
as shown.
) until it stops
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GAS CARRYING COMPONENTS OF THIS APPLIANCE
SHOULD BE INSPECTED FOR PROPER OPERATION
PERIODICALLY BYA QUALIFIED SERVICE TECHNICIAN.
It is recommended that lower water temperatures be used to
avoid the risk of scalding. It is further recommended, in all
cases, that the water temperature dial, Figure 99, 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 water temperature adjusting dial was factory
set at the lowest temperature; all the way clockwise to the
mechanical stop. Turning the dial counterclockwise increases
temperature and clockwise reduces temperature.
PILOT AND MAIN BURNER
Check pilot and main burner every six months for proper flame
characteristics. This is done by removing door on heater, fig. 1.
The main burner should provide complete combustion of gas;
ignite rapidly; give reasonably quiet operation; cause no
excessive flame lifting from burner ports. Make sure that the
flow of combustion and ventilation air is not blocked.
SETTING THE WATER HEATER TEMPERATURE AT 120°F
(APPROX. “ ” MARK ON FACE OF THERMOSTAT) WILL
REDUCE THE RISK OF SCALDS. Some states require
settings at specific lower temperatures.
If proper flame characteristics are not evident, check for
accumulation of lint or other foreign material that restricts or
blocks the air openings in the heater or burner.
Figure 99 shows the approximate water temperatures produced
at various thermostat dial settings. 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 30°F. If you
experience this type of use you should consider using lower
temperature settings to reduce scald hazards.
WARNING
SOOT BUILD-UP INDICATES A PROBLEM THAT REQUIRES
CORRECTION BEFORE FURTHER USE. CONSULT WITH A
QUALIFIED SERVICE TECHNICIAN.
Should the main burner or burner air openings require
cleaning, turn the gas control knob to “OFF” position and allow
the burner to cool. Remove the burner and clean with a soft
brush. Clean main burner orifice with a suitable soft material.
HIGH TEMPERATURE LIMIT SWITCH
(Single-Use Type Energy Cut Off)
The thermostat has a built-in limit switch which will extinguish
the pilot light in case of excessive water temperatures. The
pilot cannot be relit until the entire thermostat (labeled as
single-use type) is replaced. It is important that a serviceman
be called to determine the reason for limit operation and thus
avoid repeated thermostat replacement. Lower the temperature
adjustment dial setting on the new control.
Temperature
Setting
Time to Produce 2nd & 3rd
Degree Burns on Adult Skin
VERY HOT= approx. 160°F
C = approx. 150°F
B = approx. 140°F
A = approx. 130°F
About 1/2 second
About 1-1/2 seconds
Less than 5 seconds
About 30 seconds
VENTING
HAVE VENTING SYSTEM CHECKED EVERY SIX MONTHS FOR
OBSTRUCTIONSAND/OR DETERIORATION IN VENT PIPING.
= approx. 120°F
More than 5 minutes
LOW = approx. 80°F
TEMPERATURE & PRESSURE RELIEF VALVE
FIGURE 99
At least once a year, the temperature and pressure relief valve,
fig. 1. must be checked to ensure that it is in operating
condition. Lift the lever at the top of the valve several times until
the valve seats properly and operates freely.
Valves for reducing point-of-use temperature by mixing cold and
hot water are available (See Fig. 2). Also available are
inexpensive devices that attach to faucets to limit hot water
temperatures. Contact a licensed plumber or the local plumbing
authority.
If water does not flow, remove the valve and inspect for
obstructions or corrosion. Have a qualified servicer replace
with a new valve of the recommended size as necessary. Do
not attempt to repair the valve, as this could result in improper
operation and a tank explosion. In areas with poor water
conditions, it may be necessary to inspect the T&P valve more
frequently.
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL
TO SHUT OFF, TURN OFF THE MAIN MANUAL GAS CONTROL
VALVE TO THEAPPLIANCE (SEE FIGURE 1).
WARNING
THE WATER PASSING OUT OF THE VALVE DURING THIS
CHECKING OPERATION MAY BE EXTREMELY HOT. AVOID
CONTACT AND DISCHARGE SAFELY TO PREVENT WATER
DAMAGE.
MAINTENANCE
FOR YOUR SAFETY AND SATISFACTORY OPERATION, IT IS
RECOMMENDED THAT THIS HEATER BE CHECKED ONCE A
YEAR BYA COMPETENT SERVICE PERSON.
DRAINING
If the heater is to be shut off and exposed to freezing
temperatures, it must be drained. Water, if left in the tank and
allowed to freeze, will damage the heater.
USERS OF THIS APPLIANCE SHOULD BE AWARE THAT GAS
COMPONENTS WEAR OUT OVER A PERIOD OF TIME. THE
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•
•
•
Turn off the gas and cold water inlet valve to the heater, fig. 1.
Open a nearby hot water faucet and the heater drain valve.
BE CAREFUL TO GRASP THE DRAIN VALVE HANDLE SO
THAT THE HAND IS NOT EXPOSED TO HOT WATER. IF
DESIRED, A HOSE MAY BE CONNECTED TO THE DRAIN
VALVE TO CARRY THE WATER AWAY.
CATHODIC PROTECTION - ANODE
The anode rod within the tank is designed to be slowly
consumed cathodically, minimizing corrosion in the glass-
lined tank. A hydrogen sulfide (rotten egg) odor may result if
water contains high sulfate and/or minerals. Chlorinating the
water supply should minimize the problem. (See EXTENDED
NON-USE PERIODS).
DANGER
The water CAN BE HOT.
NOTE: Anode must remain installed (except for inspection) to
avoid shortening tank life. See LIMITED WARRANTY. Replace as
necessary.
•
•
The drain valve must be left open during the shutdown
period.
To restart heater, refer to the FILLING instructions under
OPERATION.
ANODE ROD MAINTENANCE
Periodically open the drain valve and allow the water to run until
it flows clean. This will help prevent sediment build-up in the
tank.
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.
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
It is normal for lime and scale deposits to form within the tank.
Such deposits will not be removed by periodic draining. It is
necessary to chemically delime the affected parts in water
areas where such deposits are encountered. Contact your
dealer or plumber for deliming information.
CONDENSATION
Combustion products contain water vapor which can
condense on the cooler surfaces of the tank forming droplets
which drip into the fire or run out on the floor. This is common
at the time of startup, after installation, during periods of time
when incoming water is very cold, or the heater may be
undersized for the requirements.
annually after the warranty period.
CAUTION
Before removing the anode: 1) the tank water should be cool, 2)
the cold water shut off valve must be closed, and 3) water
pressure must be relieved by opening a nearby faucet.
Occasional or steady water leakage from the bottom of the flue
may be caused by corrosive combustion products or an
improper vent. Check with your dealer for more information.
22
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TROUBLESHOOTING
Please check guidelines below. For your safety, water heater service should be performed only by a qualified service technician.
Read the GENERAL SAFETY INFORMATION section first.
PROBLEM
NO HOT WATER
POSSIBLE MALFUNCTION
1) No pilot
SERVICE TO BE PERFORMED
POSSIBLE SOLUTION
A. No gas to pilot
Check gas supply
Check gas valve
Check pilot orifice for obstruction
Check pilot tube for kink or leaks
Turn on, check pressure
Turn on or replace if needed
Clean with air or replace
Replace pilot tube
B. Pilot will not stay lit
Check gas pressure
Check thermostat MV drop-out voltage
Check thermocouple connection and
MV output
Tighten if loose, replace
as necessary
Check thermocouple placement in pilot flame
Check pilot for proper flame
Check ECO operation
3/8- should be in flame
Change pilot orifice
Replace gas valve
Bleed as necessary
Check for air in pilot tube
C. Pilot blows out
Leaking joints
Check all vent joints for proper seal.
Make sure to check inner and outer
pipe and check rear air tube seals.
Refer to installation manual.
Check for proper vent cap
Install A. O. Smith provided vent cap
Check for bent, missing, or mislocated
pilot shield (natural gas units only)
Check outer door seal
Replace or reposition
Replace gasket if missing
Tighten screws if loose
Install gasket properly if misinstalled
NOT ENOUGH
HOT WATER
1) Incorrect burner orifice
2) No gas to main burner
Check orifice size
Check gas supply
Replace with correct size
Correct as needed
Check thermostat operation
Confirm sizing requirements
Replace as needed
3) Heater too small
Replace with larger heater, add
another heater, or decrease
water usage.
YELLOW FLAMES 1) Excessive or low gas
Check gas pressure
OR SOOT
pressure
2) Combustion air restricted
Check vent for restrictions
Correct as necessary
Check venting for extra piping
Re-install as recommended in
the installation manual
CONDENSATION
1) Water on floor under heater See page 21 “CONDENSATION”
BURNER WILL
NOT STAY LIT
1) Low gas pressure
Check gas supply pressure
Check thermostat operation
Check for proper vent cap
Check location of heater
Check for proper vent sealing
Check top and/or bottom air supply
box for air leaks
2) Downdraft or
backdraft condition
Install proper vent cap
Re-install in correct location
Reseal venting
Seal as necessary
Check outer door seal
Replace gasket, tighten screws
or re-install gasket as necessary
23
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LIMITED RESIDENTIAL GAS WARRANTY
THIS WARRANTY IS APPLICABLE TO THE ORIGINAL OWNER ONLY. If
a. Labor charges for service, removal, or reinstallation of the water heater or
part thereof.
the glass lined tank in this water heater shall prove upon examination by
A. O. Smith Corporation (the warrantor) to have leaked during the warranty
period in normal residential use, due to natural corrosion from potable
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.
water therein, the warrantor will furnish the ORIGINAL OWNER
a
replacement A. O. Smith water heater of equivalent size and current model,
or a replacement part for any thermostat or thermocouple which fails in
normal use, in accordance with the warranty terms and conditions specified
below. THE A. O. SMITH REPLACEMENT MODEL OR PART WILL BE
WARRANTED FOR ONLY THE UNEXPIRED PORTION OF THE ORIGINAL
WARRANTY. The warranty period will be determined by the original
installation date of the water heater. PROOF-OF-PURCHASE AND PROOF-
OF-INSTALLATION ARE NECESSARY TO VALIDATE THIS WARRANTY.
This warranty is not transferable and applies to models listed in Table 1.
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.
TABLE 1.
WARRANTY PERIOD
CLAIM PROCEDURE
MODEL
TANK1
PARTS2
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. If this is not
practical, the owner should contact: A. O. Smith Water Products Company, 500
Tennessee Waltz Parkway, Ashland City, TN 37015 (800) 323-2636. Canadian
customers should contact A. O. Smith Enterprises, Ltd., P.O. Box 310-768 Erie
Street, Stratford, Ontario N5A 6T3, (519) 271-5800.
GDVH/GDVS
XDVS
6 YEARS
6 YEARS
6 YEARS
10 YEARS
When the water heater has been used for other than single family residential
application; 1. The tank warranty shall be reduced to 1 year for 6 year
models and 3 years for 10 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.
The warrantor will only honor replacement with identical or similar water
heater or parts thereof which are manufactured or distributed by the
warrantor.
Dealer replacements are made subject to in-warranty validation by
warrantor.
CONDITIONS AND EXCEPTIONS
PROOF-OF-PURCHASE AND PROOF-OF-INSTALLATION DATE ARE
REQUIRED TO SUPPORT WARRANTY CLAIM FROM ORIGINAL OWNER.
THIS FORM DOES NOT CONSTITUTE PROOF-OF-PURCHASE OR
PROOF-OF-INSTALLATION.
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 American Gas 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, LOSS OR DAMAGE TO PERSONAL PROPERTY,
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;
•
•
not subjected to excessive water pressure fluctuations and not subject to
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, its territories or possessions, and Canada;
sized in accordance with proper sizing techniques for residential water
heaters;
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.
•
•
•
•
•
This warranty gives you specific legal rights, and you may also have other
rights which vary from state to state.
•
•
•
bearing a rating plate which has not been altered, defaced or removed
except as required by the warrantor;
not used in a closed system without a properly sized and installed
thermal expansion tank;
fired at the factory rated input using the fuel stated on the face of the
rating plate;
operated with the inner and outer combustion chamber doors in place.
maintained in accordance with the instructions printed in the manual
included with the heater.
IMPORTANT INFORMATION
Model Number _________________________________________
Serial Number _________________________________________
Installation Information _______________________________
Date Installed __________________________________________
Company’s Name ______________________________________
Street or P.O. Box ______________________________________
City, State, and Zip Code _________________________________
Phone Number _________________________________________
Plumber’s Name ________________________________________
•
•
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.
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:
24
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NOTES
25
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NOTES
26
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500 TENNESSEE WALTZ PARKWAY, ASHLAND CITY, TN 37015
PHONE: 1-800-433-2545 FAX: 1-800-433-2515
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