AO Smith Water Heater BTH 120 250 User Guide

CYCLONE XHE® Model BTH 120 - 250  
COMMERCIAL GAS WATER HEATER  
GAS-FIRED POWER BURNER  
FOR DOMESTIC HOT WATER  
• INSTALLATION • OPERATION • SERVICE • MAINTENANCE • LIMITED WARRANTY  
WARNING: If the information in these  
instructions is not followed exactly, a fire  
or explosion may result causing property  
damage, personal injury or death.  
– Do not store or use gasoline or other  
flammable vapors and liquids in the  
vicinity of this or any other appliance.  
– WHAT TO DO IF YOU SMELL GAS:  
• Do not try to light any appliance.  
• Do not touch any electrical 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.  
• If you cannot reach your gas supplier,  
call the fire department.  
– Installation and service must be  
performed by a qualified installer,  
service agency or the gas supplier.  
Thank you for buying this energy efficient water heater from  
A.O. Smith Water Products Company. We appreciate your  
confidence in our products.  
CAUTION  
TEXT PRINTED OR OUTLINED IN RED CONTAINS  
INFORMATION RELATIVE TO YOUR SAFETY. PLEASE  
READ THOROUGHLY BEFORE INSTALLING AND USING  
THIS APPLIANCE.  
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND  
A DIVISION OF A.O. SMITH CORPORATION  
NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.  
Mc BEE, SOUTH CAROLINA  
PRINTED IN U.S.A. 2570 1199  
Part No. 194119-000  
Supersedes P/Ns. 192968-000/193329-000/193311-000  
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ROUGH-IN -DIMENSIONS  
CYCLONE XHE BTH 120 - 250  
Table 1. RECOVERY CAPACITIES - NATURAL GAS / L.P.  
TEMPERATURE RISE - DEGREES °F - GALLONS PER HOUR  
Model  
BTU  
Input  
Approx.  
Gallon  
Capacity 30  
40  
50  
60  
70  
80  
90  
100  
142  
137  
171  
171  
228  
228  
274  
110  
129  
124  
155  
155  
207  
207  
248  
120  
119  
114  
142  
142  
190  
190  
228  
130  
110  
105  
132  
132  
175  
175  
210  
140  
102  
98  
BTH - 120  
BTH - 120  
BTH - 150  
BTH - 150  
BTH - 199  
BTH - 199  
BTH - 250  
125,000 Nat.  
120,000 L.P.  
150,000 Nat.  
150,000 L.P.  
199,900 Nat.  
199,900 L.P.  
240,000 Nat.  
60  
60  
475  
456  
570  
570  
759  
759  
912  
356  
342  
427  
427  
569  
569  
684  
285  
274  
342  
342  
456  
456  
547  
237  
228  
285  
285  
380  
380  
456  
203  
195  
244  
244  
325  
325  
391  
178  
171  
214  
214  
285  
285  
342  
158  
152  
190  
190  
253  
253  
304  
100  
100  
100  
100  
100  
122  
122  
163  
163  
195  
Recovery capacities are based on heater performance at 94% thermal efficiency.  
2
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FOREWORD  
In addition to these instructions, the equipment shall be installed in  
These designs comply with the latest version of the American National  
Standard for Gas Water Heaters, Volume III, ANSI Z21.10.3 as an automatic  
circulating tank water heater, and automatic storage water heaters.  
accordance with those installation regulations in force in the local area  
where the installation is to be made. These shall be carefully followed in all  
cases. Authorities having jurisdiction should be consulted before  
installations are made.  
Detailed installation diagrams are found in this manual. These diagrams will  
serve to provide the installer with a reference for the materials and methods  
of piping necessary. It is highly essential that all water, gas piping and  
wiring be installed as shown on the diagrams.  
In the absence of local codes, the installation must comply with the latest  
editions of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and the  
National Electric Code, NFPA 70. The former is available from the  
Canadian Standards Association, 8501 East Pleasant Valley Road,  
Cleveland, OH 44131, and both documents are available from the National  
Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02269.  
Particular attention should be given to the installation of thermometers at  
the locations indicated on the diagrams as these are necessary for checking  
the proper functioning of the heater.  
TABLE OF CONTENTS  
PAGE  
PAGE  
Water Line Connections..................................................................  
Heater Wiring ..................................................................................  
OPERATION .........................................................................................  
Sequence of Operation ...................................................................  
Self Diagnostic Controller ...............................................................  
Gas Value LEDs Flashing ...............................................................  
Error Codes .....................................................................................  
Fault Conditions ..............................................................................  
No Incoming Line Voltage ...............................................................  
No Low Voltage ...............................................................................  
Temperature Probe Fault .................................................................  
E.C.O. Switch Open ........................................................................  
Control Bad .....................................................................................  
Combustion Air Blockage ................................................................  
PRIOR TO START-UP ..........................................................................  
14  
14  
15  
15  
15  
15  
16  
16  
16  
16  
16  
17  
17  
17  
18  
ROUGH-IN DIMENSIONS ...................................................................  
FOREWORD .......................................................................................  
FEATURES ...........................................................................................  
Water Temperature Control .............................................................  
High Limit Switch (E.C.O.) ..............................................................  
Dishwashing Machine Requirement ................................................  
Circulating Pump .............................................................................  
INSTALLATION INSTRUCTIONS .........................................................  
Required Ability ...............................................................................  
Insulation Blankets ..........................................................................  
Locating The Heater ........................................................................  
Clearances ......................................................................................  
Hard Water......................................................................................  
Air Requirements ............................................................................  
Mechanical Exhausting of Room Air ...............................................  
Unconfined Space ..........................................................................  
Confined Space ..............................................................................  
Chemical Vapor Corrosion ..............................................................  
VENTING .............................................................................................  
Vent Pipe Termination .....................................................................  
Direct Venting .................................................................................  
Direct Vent Terminal Installation (Sidewall) .....................................  
Installation Sequence ......................................................................  
Vertical Vent Terminal Installation ...................................................  
Installation Sequence ......................................................................  
2
3
4
4
4
5
5
5
5
5
5
6
6
6
6
6
6
6
6
6
8
8
9
10  
10  
Required Ability ............................................................................... 18  
OPERATIING INSTRUCTIONS ............................................................. 18  
Adjustment Procedure (Initial Start-Up) ........................................... 18  
Lighting Instructions ........................................................................ 19  
Cathodic Protection ......................................................................... 20  
Precautions ...................................................................................... 20  
GENERAL INFORMATION .................................................................... 20  
Power Burner ................................................................................... 20  
High Limit ........................................................................................ 20  
High Altitude Installations ................................................................ 20  
MAINTENANCE ..................................................................................... 20  
General ............................................................................................ 20  
Maintenance Schedule ..................................................................... 20  
Flushing ........................................................................................... 21  
Draining ........................................................................................... 21  
Sediment Removal .......................................................................... 21  
Lime Scale Removal ....................................................................... 21  
Anode Inspection and Replacement ................................................ 21-22  
Drain Valve and Access Panels ...................................................... 22  
Relief Valve ..................................................................................... 22  
Circulating Pump ............................................................................. 22  
Vent System ................................................................................... 22  
INSTALLATION DIAGRAMS ................................................................... 23 - 27  
Manifold Kits .................................................................................... 28  
CHECKLIST AND SERVICE INFORMATION ....................................... 29  
TROUBLE-SHOOTING .......................................................................... 29-30  
REPLACEMENT PARTS ......................................................................... 30  
Installation of Vent System ............................................................ 10 -11  
Vent Pipe Preparation ..................................................................... 11  
CONTROLS AND SWITCHES............................................................. 11-12  
Blower Prover Switch ......................................................................  
Blocked Outlet Prover Switch ..............................................................  
Blocked Inlet Prover Switch ............................................................  
Low Gas Pressure Switch ...............................................................  
On/Off Switch .................................................................................  
Hot Surface Igniter .........................................................................  
GAS PIPING ........................................................................................  
Connection of Gas Pipe..................................................................  
Purging ............................................................................................  
Gas Meter Size - City Gases Only .................................................  
Gas Pressure Regulation ................................................................  
Gas Valves......................................................................................  
SYSTEM CONNECTIONS ...................................................................  
Thermometers .................................................................................  
Relief Valve ....................................................................................  
11  
12  
12  
12  
12  
12  
12  
13  
13  
13  
13  
13  
13  
13  
13  
LIMITED WARRANTY .........................................................................  
31  
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FEATURES  
IMPORTANT  
ITISREQUIREDTHATAQUALIFIEDSERVICETECHNICIANPERFORMTHE  
INITIAL FIRING OF THE HEATER. AT THIS TIME THE USER SHOULD NOT  
HESITATE TO ASK THE TECHNICIAN ANY QUESTIONS WHICH HE MAY  
HAVE IN REGARD TO THE OPERATION AND MAINTENANCE OF THE UNIT.  
Temperature  
Setting  
180°F  
Time to Produce 2nd & 3rd  
Degree Burns on Adult Skin  
Nearly instantaneous  
Nearly instantaneous  
About 1/2 second  
A CHECKLIST AND SERVICE INFORMATION section are included at the rear  
of this manual. By using this checklist the user may be able to make minor  
operational adjustments and save himself unnecessary service calls.  
However, the user should not attempt repairs which are not listed in this  
section.  
170°F  
160°F  
150°F  
About 1-1/2 seconds  
Less than 5 seconds  
About 30 seconds  
WATER TEMPERATURE CONTROL  
140°F  
130°F  
120°F  
More than 5 minutes  
FIGURE 1  
Valves for reducing 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.  
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 SCALD BURNS RESULTING IN SERIOUS PERSONAL INJURY AND/  
ORDEATH. THETEMPERATUREATWHICHINJURYOCCURSVARIESWITH  
THEPERSON’SAGEANDTIMEOFEXPOSURE. THESLOWERRESPONSE  
TIMEOFDISABLEDPERSONSINCREASESTHEHAZARDSTOTHEM.NEVER  
ALLOW SMALL CHILDREN TO USE A HOT WATER TAP, OR TO DRAW  
THEIROWNBATHWATER. NEVERLEAVEACHILDORDISABLEDPERSON  
UNATTENDED IN A BATHTUB OR SHOWER.  
THE WATER HEATER SHOULD BE LOCATED IN AN AREA WHERE THE  
GENERAL PUBLIC DOES NOT HAVE ACCESS TO SET TEMPERATURES.  
FIGURE 2  
The water temperature is controlled using the Temperature Control Button  
on the Display at the front of the unit (See Figure 1). This control utilizes  
two temperature probes to determine the tank temperature. The primary  
temperature probe is located at the top of the tank and the other is near the  
water inlet.  
HIGH 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 the main burner  
gas flow should the water temperature reach approximately 202°F.  
The temperature may be adjusted from 80° to 180°F. The thermostat was  
adjusted to 120°F before the heater was shipped from the factory. 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  
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.  
Should the high limit switch activate, it must be manually reset by depressing  
the Temperature Adjustment Button/Reset Button on the display board. The  
water temperature must drop below 160°F before the controller can be  
reset.  
Continued manual resetting of high limit control, preceded by higher than  
usual water temperature is evidence of high limit switch operation. The  
following are possible reasons for high limit switch operation.  
SETTINGTHEWATERHEATERTEMPERATUREAT120°FWILLREDUCETHE  
RISK OF SCALDS. Some states require settings at specific lower  
temperatures.  
•
A malfunction in the thermostatic controls would allow the gas valve to  
remain open causing water temperature to exceed the thermostat setting.  
The water temperature would continue to rise until high limit switch  
operation.  
Figure 1 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. If you experience this type of use, you should consider using  
lower temperature settings to reduce scald hazards.  
Contact your dealer or servicer if continued high limit switch operation  
occurs.  
4
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DISHWASHING MACHINE REQUIREMENT  
LOCATING THE HEATER  
All dishwashing machines meeting the National Sanitation Foundation  
requirements are designed to operate with water flow pressures between  
15 and 25 pounds per square inch. Flow pressures above 25 pounds per  
square inch, or below 15 pounds per square inch, will result in improperly  
sanitized dishes. Where pressures are high, a water pressure reducing  
or flow regulating control valve should be used in the 180°F line to the  
dishwashing machine, and should be adjusted to deliver water between  
these limits.  
WARNING  
THERE IS A RISK IN USING FUEL BURNING APPLIANCES SUCH AS GAS  
WATER HEATERS IN ROOMS, GARAGES OR OTHER AREAS WHERE  
GASOLINE,OTHERFLAMMABLELIQUIDSORENGINEDRIVENEQUIPMENT  
OR VEHICLES ARE STORED, OPERATED OR REPAIRED. FLAMMABLE  
VAPORS ARE HEAVY AND TRAVEL ALONG THE FLOOR AND MAY BE  
IGNITEDBYTHEHEATER’SIGNITERORMAINBURNERFLAMESCAUSING  
FIREOREXPLOSION. SOMELOCALCODESPERMITOPERATIONOFGAS  
APPLIANCES IF INSTALLED 18 INCHES OR MORE ABOVE THE FLOOR.  
THISMAYREDUCETHERISKIFLOCATIONINSUCHANAREACANNOTBE  
AVOIDED.  
The National Sanitation Foundation also recommends circulation of 180°F  
water. Where this is done, the circulation should be very gentle so that it  
does not cause any unnecessary turbulence inside the water heater. The  
circulation should be just enough to provide 180°F water at the point of  
take-off to the dishwashing machine. Adjust flow by means of the plug  
cock in the circulating line. (See installation diagrams.)  
THEHEATERSHALLBELOCATEDORPROTECTEDSOITISNOTSUBJECT  
TO PHYSICAL DAMAGE BY A MOVING VEHICLE.  
DO NOT LOCATE THE HEATER WHERE NOISE FROM THE EXHAUST OR  
INTAKEWILLBEOBJECTIONABLE.THISINCLUDESLOCATIONSCLOSETO  
OR ACROSS FROM WINDOWS AND DOORS. AVOID ANCHORING THE  
VENT AND INTAKE PIPES DIRECTLY TO FRAMED WALLS, FLOORS OF  
CEILINGSUNLESSRUBBERISOLATIONPIPEHANGERSAREUSED. THIS  
PREVENTSANYVIBRATIONSFROMBEINGTRANSMITTEDINTOTHELIVING  
SPACES.  
CIRCULATING PUMP  
A circulating pump is used when a system requires a circulating loop or  
there is a storage tank used in conjunction with the heater. Refer to the  
piping diagrams at rear of manual for electrical hookup information and  
install in accordance with the latest version of the National Electric Code  
ANSI/NFPA No. 70.  
WARNING  
FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY OTHER  
POTENTIALFIREHAZARDOUSARTICLESMUSTNEVERBEPLACEDON  
OR ADJACENT TO THE HEATER. OPEN CONTAINERS OF FLAMMABLE  
MATERIALSHOULDNOTBESTOREDORUSEDINTHESAMEROOMWITH  
THEHEATER.  
Only all bronze circulators are used with commercial water heaters.  
Although circulators are oiled and operated by the manufacturer some  
circulators must be oiled again before operated. Please refer to  
manufacturer's instructions.  
When installing the heater, consideration must be given to proper location.  
Location selected should be as close to the intake and exhaust termination  
points as practicable, with adequate air supply and as centralized with the  
piping system as possible.  
INSTALLATION INSTRUCTIONS  
THE HEATER MUST NOT BE LOCATED IN AN AREA WHERE IT WILL BE  
SUBJECTTOFREEZING.  
REQUIRED ABILITY  
INSTALLATION OR SERVICE OF THIS WATER HEATER REQUIRES ABILITY  
EQUIVALENT TO THAT OF A LICENSED TRADESMAN IN THE FIELD  
INVOLVED. PLUMBING, AIR SUPPLY, VENTING, GAS SUPPLY AND  
ELECTRICALWORKAREREQUIRED.  
LOCATE IT NEAR A FLOOR DRAIN. THE HEATER SHOULD BE LOCATED IN  
AN AREA WHERE LEAKAGE FROM THE HEATER OR CONNECTIONS WILL  
NOTRESULTINDAMAGETOTHEADJACENTAREAORTOLOWERFLOORS  
OFTHESTRUCTURE.  
When such locations cannot be avoided, it is recommended that a suitable  
drain pan, adequately drained, be installed under the appliance.  
INSULATION BLANKETS  
WARNING  
Insulation blankets available to the general public for external use on gas  
water heaters are not approved for use on your A.O. Smith water heater.  
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 ASHRAE/IES 90.1b 1992 standards with  
respect to insulation and standby loss requirements, making an insulation  
blanket unnecessary.  
THISWATERHEATERISACONDENSINGUNITANDREQUIRESADRAINTO  
BE LOCATED IN CLOSE PROXIMITY TO ALLOW THE CONDENSATE TO  
DRAIN SAFELY. THE CONDENSATE DRAINS FROM THE UNIT AT THE  
EXHAUST ELBOW LOCATED AT THE BOTTOM OF THE UNIT. NOTE: IT IS  
IMPORTANT THAT THE CONDENSATE HOSE NOT BE ELEVATED ABOVE  
THEEXHAUSTELBOW(SEEFIGURE3). THECONDENSATEBUILD-UPWILL  
BLOCK THE EXHAUST OUTLET, WHICH WILL CAUSE IMPROPER  
OPERATION.  
WARNING  
Should you choose to apply an insulation blanket to this heater, you should  
follow these instructions. Failure to follow these instructions can result in  
fire, asphyxiation, serious personal injury or death.  
•
Do not apply insulation to the top, or the upper 15" of the water heater,  
as this will interfere with safe operation.  
•
•
Do not cover the 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 labels from A.O. Smith for placement on the blanket  
directly over the existing labels.  
FIGURE 3  
5
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UNCONFINED SPACE  
WARNING  
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDER WATER.  
IMMEDIATELYCALLAQUALIFIEDSERVICETECHNICIANTOINSPECTTHE  
APPLIANCE AND TO REPLACE ANY PART OF THE CONTROL SYSTEM  
AND ANY GAS CONTROL WHICH HAS BEEN UNDER WATER.  
In buildings of conventional frame, brick or stone construction, unconfined  
spaces may provide adequate air for combustion and ventilation.  
If the unconfined space is within a building of tight construction (buildings  
using the following construction: weather stripping, heavy insulation,  
caulking, vapor barrier, etc.), air for combustion and ventilation must be  
obtained from outdoors. The installation instructions for confined spaces  
in tightly constructed buildings must be followed to ensure adequate air  
supply.  
CLEARANCES  
These heaters are approved for installation on combustible flooring in an  
alcove when the minimum clearances from any combustion construction  
are followed as indicated in Figure 4.  
CONFINED SPACE  
When drawing combustion air from inside a conventionally constructed  
building to a confined space, such a space shall be provided with two  
permanent openings, ONE IN OR WITHIN 12 INCHES OF THE ENCLOSURE  
TOP AND ONE IN OR WITHIN 12 INCHES OF THE ENCLOSURE BOTTOM.  
Each opening shall have a free area of at least one square inch per 1000  
Btuh of the total input of all appliances in the enclosure, but not less than  
100 square inches.  
In all installations the minimum combustible clearances from any vent piping  
shall be 0". Vent piping passing through a combustible wall or ceiling must  
be a continuous run (no joints).  
A service clearance of 24" should be maintained from serviceable parts  
such as relief valves, flue baffles, flue damper devices, thermostats,  
cleanout openings or drain valves.  
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 through vertical ducts, two permanent  
openings, located in the above manner, shall be provided. Each opening  
shall have a free area of not less than one square inch per 4000 Btuh of the  
total input of all appliances in the enclosure. If horizontal ducts are used,  
each opening shall have a free area of not less than one square inch per  
2000 Btuh of the total input of all appliances in the enclosure.  
Always disconnect electrical power before servicing the unit  
CHEMICAL VAPOR CORROSION  
WARNING  
CORROSION OF THE FLUE WAYS AND VENT SYSTEM MAY OCCUR IF AIR  
FOR COMBUSTION CONTAINS CERTAIN CHEMICAL VAPORS. SUCH  
CORROSION MAY RESULT IN FAILURE AND RISK OF ASPHYXIATION.  
Spray can propellants, cleaning solvents, refrigerator and air conditioning  
refrigerants, swimming pool chemicals, calcium and sodium chloride, waxes,  
and process chemicals are typical compounds which are potentially  
corrosive.  
FIGURE 4  
*ILLUSTRATION OF MINIMUM COMBUSTIBLE CLEARANCES IN AN  
ALCOVE  
HARD WATER  
PRODUCTSOFTHISSORTSHOULDNOTBESTOREDNEARTHEHEATER.  
ALSO, AIR WHICH IS BROUGHT IN CONTACT WITH THE HEATER SHOULD  
NOT CONTAIN ANY OF THESE CHEMICALS. IF NECESSARY,  
UNCONTAMINATEDAIRSHOULDBEOBTAINEDFROMREMOTEOROUTSIDE  
SOURCES.  
Where hard water conditions exist, water softening or the threshold type  
of water treatment is recommended. This will protect the dishwashers,  
coffee urns, water heaters, water piping and other equipment.  
VENTING  
See MAINTENANCE section for details of tank cleanout procedure.  
WARNING  
THEINSTRUCTIONSINTHISSECTIONONVENTINGMUSTBEFOLLOWED  
TOAVOID CHOKED COMBUSTION OR RECIRCULATION OF FLUE GASES.  
SUCH CONDITIONS CAUSE SOOTING OR RISKS OF FIRE AND  
ASPHYXIATION.  
AIR REQUIREMENTS  
KEEPAPPLIANCEAREACLEARANDFREEOFCOMBUSTIBLEMATERIALS,  
GASOLINE AND OTHER FLAMMABLE VAPORS AND LIQUIDS.  
Heater must be protected from freezing downdrafts during shutdown periods.  
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILATING AIR.  
WARNING  
WARNING  
NEVEROPERATETHEHEATERUNLESSITISVENTEDTOTHEOUTDOORS  
AND HAS ADEQUATE AIR SUPPLY TO AVOID RISKS OF IMPROPER  
OPERATION, FIRE, EXPLOSIONORASPHYXIATION.  
FORSAFEOPERATIONPROVIDEADEQUATEAIRFORCOMBUSTIONAND  
VENTILATION. AN INSUFFICIENT SUPPLY OF AIR WILL CAUSE  
RECIRCULATION OF COMBUSTION PRODUCTS RESULTING IN  
CONTAMINATIONTHATMAYBEHAZARDOUSTOLIFE. SUCHACONDITION  
OFTENWILLRESULTINAYELLOW, LUMINOUSBURNERFLAME, CAUSING  
CARBONING OR SOOTING OF THE COMBUSTION CHAMBER, BURNERS  
AND FLUE TUBES AND CREATES A RISK OF ASPHYXIATION.  
VENT PIPE TERMINATION  
NOTE: Before installing venting, determine place of vent pipe termination.  
See Figure 6 before proceeding.  
MECHANICAL EXHAUSTING OF ROOM AIR  
CAUTION  
DONOTTERMINATETHEVENTINGWHERENOISEFROMTHEEXHAUSTOR  
INTAKEWILLBEOBJECTIONABLE. THISINCLUDESLOCATIONSCLOSETO  
OR ACROSS FROM WINDOWS AND DOORS. AVOID ANCHORING THE  
VENT AND INTAKE PIPES DIRECTLY TO FRAMED WALLS, FLOORS OR  
CEILINGS UNLESS RUBBER ISOLATION PIPE HANGERS ARE USED. THIS  
PREVENTSANYVIBRATIONSFROMBEINGTRANSMITTEDINTOTHELIVING  
SPACES.  
Where an exhaust fan is installed in the same room with a heater, sufficient  
openings for air must be provided in the walls. UNDERSIZED OPENINGS  
WILLCAUSEAIRTOBEDRAWNINTOTHEROOMTHROUGHTHEHEATER’S  
VENTINGSYSTEM, CAUSINGPOORCOMBUSTION. SOOTINGMAYRESULT  
INSERIOUSDAMAGETOTHEHEATERANDRISKOFFIREOREXPLOSION.  
IT CAN ALSO CREATE A RISK OF ASPHYXIATION.  
6
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