A.O. Smith BT- 65 Instruction manual
MODEL BT- 65
COMMERCIAL GAS WATER HEATER
Glass-Lined Tank-type Water Heater
Thank you for buying this energy efficient water heater from
A.O. Smith Water Products Company. We appreciate your confidence in our products.
PRINTED IN U.S.A. 0703
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
McBEE, SOUTH CAROLINA, USA
STRATFORD, ONTARIO, CANADA
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER
AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
PART NO. 195701-000
SUPERSEDES PART NO. 194975-000
63 1/2 mm 1613
U.S. Gallons/Hrs. and Litres/Hr. at TEMPERATURE RISE INDICATED
Type of Input Approx.
F° 20F° 30F° 40F° 50F° 60F° 70F° 80F° 90F° 100F° 110F° 120F° 130F° 140F°
Model Gas Btuh KW Capacity C° 11C° 17C° 22C° 28C° 33C° 39C° 44°C 50C° 56C° 61C° 67C° 72C° 78C°
65 US Gals. GPH
246 Litres LPH
65 US Gals. GPH 253 169 127 101 84 72 63 56 51 46 42
246 Litres LPH 959 639 479 384 320 274 240 213 192 174 160
The design of Model BT-65 complies with the latest version of
ANSI Z21.10.1/CSA 4.1 M98 as automatic storage type water heater.
Installation diagrams are found in this manual. These diagrams will serve to provide the installer with a reference for the materials and method of piping necessary. It is highly essential that all water and gas piping be installed as shown on the diagrams.
In addition to these instructions, the equipment shall be installed in 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
2 should be consulted before installations are made.
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 latest editions of the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, in Canada CAN/CSA
B 149.1-00. Both are available from the Canadian Standards
Association, 8501 East Pleasant Valley Road, Cleveland, OH 44131.
For Canadian customers, 178 Rexdale Blvd., Rexdale (Toronto),
Ontario, Canada M9W 1R3. The National Fuel Gas Code, ANSI
Z223.1/NFPA 54 is available from the National Fire Protection
Association, 1 Batterymarch Park, Quincy, MA 02269.
TABLE OF CONTENTS
ROUGH-IN DIMENSIONS ....................................................................... 2
FOREWORD .......................................................................................... 2
GENERAL SAFETY INFORMATION ...................................................... 3
Precautions ....................................................................................... 3
Liquid Petroleum ............................................................................... 3
Chemical Vapor Corrosion ............................................................... 3
Improper Combustion ........................................................................ 3
Extended Non-use Periods .............................................................. 3-4
Insulation Blankets ............................................................................ 4
INSTALLATION INSTRUCTIONS ............................................................ 4
Required Ability ................................................................................ 4
Locating The Heater ......................................................................... 4
High Altitude Installations ................................................................. 4-5
Clearances ....................................................................................... 5
Hard Water ....................................................................................... 5
Air Requirements .............................................................................. 5
Combination Water (Potable) Heating and Space Heating .............. 5-6
Venting .............................................................................................. 6
Thermometers (Not Supplied) .......................................................... 6
Relief Valve ....................................................................................... 6-7
Gas Piping ......................................................................................... 7-8
Purging .............................................................................................. 8
Gas Pressure Regulation ................................................................ 9
OPERATION .......................................................................................... 9
Precautions ...................................................................................... 9
Lighting Instructions ........................................................................ 10
Temperature Regulation .................................................................. 11
High Temperature Limit Switch ........................................................ 11
Checking Venting ............................................................................. 11-12
SERVICE INFORMATION ...................................................................... 12
Pilot and Main Burner ....................................................................... 12
Checking Gas Input .........................................................................12-13
Vent System .................................................................................... 13
Relief Valve ...................................................................................... 13
Hot Water Odor ............................................................................... 13
Anode Rod Inspection ..................................................................... 13
Winter Protection ............................................................................. 13
Replacement Parts .......................................................................... 13
CHECKLIST .......................................................................................... 13-14
LIMITED WARRANTY ............................................................................ 15
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDER
WATER. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water.
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 the water heater is due to a corrosive atmosphere.
(Refer to the limited warranty for complete terms and conditions.)
IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT
OPERATE HEATER UNTIL ALL CORRECTIVE STEPS HAVE BEEN
MADE BY A QUALIFIED SERVICEMAN.
ATTIC AND/OR EXHAUST FANS OPERATING ON THE PREMISES
WITH A WATER HEATER CAN RESULT IN CARBON MONOXIDE
POISONING AND DEATH.
1. EXTERNAL FIRE.
3. FIRING WITHOUT WATER.
OPERATION OF THESE FANS CAN PRODUCE A NEGATIVE DRAFT
IN THE AREA OF THE WATER HEATER PREVENTING THE
PRODUCTS OF COMBUSTION FROM EXHAUSTING THROUGH
THE CHIMNEY OR VENT PIPE.
LIQUID PETROLEUM MODELS
The venting of the water heater should be inspected by a qualified service technician at the time of installation and periodically thereafter to ensure a down-draft condition does not exist.
Water heaters for propane or liquified petroleum gas (LPG) are different from natural gas models. A natural gas heater will not function safely on LP gas and no attempt should be made to convert a heater from natural gas to LP gas.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND
VENTILATING AIR. ADEQUATE AIR FOR COMBUSTION AND
VENTILATION MUST BE PROVIDED FOR SAFE OPERATION.
EXTENDED NON-USE PERIODS
CHEMICAL VAPOR CORROSION
CORROSION OF THE FLUEWAYS 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
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 FAUCET AT THE TIME IT IS OPEN.
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 INSTALL THIS WATER HEATER DIRECTLY ON A
CARPETED FLOOR. A FIRE 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 mm) in any direction. If the heater is installed in a carpeted alcove or closet, the entire floor shall be covered by the panel. Also, see the drain requirements.
Insulation blankets available to the general public for external use on gas water heaters are not necessary with 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 requirement making an insulation blanket unnecessary.
THIS HEATER SHALL BE LOCATED OR PROTECTED SO IT IS
NOT SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.
FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY
OTHER POTENTIAL FIRE HAZARDOUS ARTICLES MUST
NEVER BE PLACED ON OR ADJACENT TO THE HEATER. OPEN
CONTAINERS OF FLAMMABLE MATERIAL SHOULD NOT BE
STORED OR USED IN THE SAME ROOM WITH THE HEATER.
• Do not apply insulation to the top of the water heater, as this will interfere with safe operation of the draft hood.
THE HEATER MUST NOT BE LOCATED IN AN AREA WHERE IT
WILL BE SUBJECT TO FREEZING.
• Do not cover the outer door, thermostat or temperature & pressure relief valve.
THE HEATER SHOULD BE LOCATED IN AN AREA WHERE
LEAKAGE FROM THE HEATER OR CONNECTIONS WILL NOT
RESULT IN DAMAGE TO THE ADJACENT AREA OR TO LOWER
FLOORS OF THE STRUCTURE.
• Do not allow insulation to come within 2" (51 mm) of the floor to prevent blockage of combustion air flow to the burner.
• Do not cover the instruction manual. Keep it on the side of the water heater or nearby for future reference.
• Do obtain new warning and instruction labels from A.O. Smith for placement on the blanket directly over the existing labels.
• Do inspect the insulation blanket frequently to make certain it does not sag, thereby obstructing combustion air flow.
WHEN SUCH LOCATIONS CANNOT BE AVOIDED, A SUITABLE
DRAIN PAN SHOULD BE INSTALLED UNDER THE HEATER.
Such pans should be fabricated with sides at least 2" (51 mm) deep, with length and width at least 2" (51 mm) greater than the diameter of the heater and must be piped to an adequate drain.
The pan must not restrict combustion air flow.
Drain pans suitable for these heaters are available from your distributor or A. O. Smith Water Products Company, 5621 West
115th Street, Alsip, IL 60803. In Canada contact A.O. Smith
Enterprises, LTD., 768 Erie Street, Stratford, Ontario,
Canada N5A 6T3.
For appliance installation locations with elevations above
2000 feet (610 meters), refer to HIGH ALTITUDE INSTALLATIONS section of this manual for input reduction procedure.
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 SUPPLY WORK ARE REQUIRED.
LOCATING THE HEATER
When installing the heater, consideration must be given to proper location. Location selected should be as close to the stack or chimney as practicable, with adequate air supply and as centralized with the piping system as possible.
HIGH ALTITUDE INSTALLATIONS
INSTALLATIONS ABOVE 2000 FEET (610 METERS) REQUIRE
REPLACEMENT OF THE BURNER ORIFICE IN ACCORDANCE
WITH SECTION 8.1.2 OF THE NATIONAL FUEL GAS CODE (ANSI
Z223.1). FOR CANADIAN INSTALLATIONS CONSULT CANADIAN
INSTALLATIONS CODES AND CAN/CSA B149.1-00. FAILURE TO
REPLACE THE ORIFICE WILL RESULT IN IMPROPER AND
INEFFICIENT OPERATION OF THE APPLIANCE RESULTING IN
THE PRODUCTION OF INCREASED LEVELS OF CARBON
MONOXIDE GAS IN EXCESS OF SAFE LIMITS WHICH COULD
RESULT IN SERIOUS PERSONAL INJURY OR DEATH.
THERE IS A RISK IN USING FUEL BURNING APPLIANCES SUCH
AS GAS WATER HEATERS IN ROOMS, GARAGES OR OTHER
AREAS WHERE GASOLINE, OTHER FLAMMABLE LIQUIDS OR
ENGINE DRIVEN EQUIPMENT OR VEHICLES ARE STORED,
OPERATED OR REPAIRED. FLAMMABLE VAPORS ARE HEAVY
AND TRAVEL ALONG THE FLOOR AND MAY BE IGNITED BY THE
HEATER’S PILOT OR MAIN BURNER FLAMES CAUSING FIRE OR
EXPLOSION. SOME LOCAL CODES PERMIT OPERATION OF GAS
APPLIANCES IF INSTALLED 18 INCHES (457 mm) OR MORE
ABOVE THE FLOOR. THIS MAY REDUCE THE RISK IF LOCATION
IN SUCH AN AREA CANNOT BE AVOIDED.
You should contact your gas supplier for any specific changes which may be required in your area.
As elevation above sea level is increased, there is less oxygen per cubic foot of air. Therefore, the heater input rate should be reduced at high altitudes for satisfactory operation with the reduced oxygen supply. Failure to make this reduction would result in an overfiring of the heater causing sooting, poor combustion and/or unsatisfactory heater performance.
Ratings specified by manufacturers for most appliances apply for elevations up to 2000 feet (610 m). For elevations above 2000 feet
(610 m), ratings must be reduced at the rate of 4% for each 1000 feet (305 m) above sea level. For example, if a heater is rated at
65,000 Btuh (19 Kw) at sea level, to rate the heater at 4000 feet
(1219 m), you subtract 4 (once for each thousand feet) x.04
(4% input reduction) x 65,000 (original rating) from the original rating. Therefore, to calculate the input rating at 4,000 feet (1219 m): 4 x .04 x 65,000 = 10,400 Btuh (3.0 Kw), 65,000
(19 Kw) - 10,400 (3.0 Kw) = 54,600 Btuh (16 Kw). At 6000 feet
(1829 m) the correct input rating should be 49,400 Btuh (14.5 Kw).
Appliances with inputs up to and including 400,000 BTU must be factory equipped with orifices for operation at specific elevations. Standard (sea level) orifices permit operation up to
2000' (610 m) elevation. For operation between 2000' (610 m) and
4500' (1370 m) specify "HIGH ALTITUDE OPERATION" when ordering the heater(s). For operation above 4500' (2370 m) consult factory before ordering.
Field conversion for operation at altitudes other than that specified on the heater rating plate is not permitted.
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE
MATERIALS, GASOLINE AND OTHER FLAMMABLES, VAPORS AND
DO NOT OBSTRUCT THE FLOW OF COMBUSTION OR
FOR SAFE OPERATION PROVIDE ADEQUATE AIR FOR
COMBUSTION AND VENTILATION. AN INSUFFICIENT SUPPLY
OF AIR WILL CAUSE RECIRCULATION OF COMBUSTION
PRODUCTS RESULTING IN AIR CONTAMINATION THAT MAY BE
HAZARDOUS TO LIFE. SUCH A CONDITION OFTEN WILL
RESULT IN A YELLOW, LUMINOUS BURNER FLAME, CAUSING
CARBONING OR SOOTING OF THE COMBUSTION CHAMBER,
BURNERS AND FLUE TUBES AND CREATES A RISK OF
Where an exhaust fan is supplied in the same room with a heater, sufficient openings for air must be provided in the walls.
UNDERSIZED OPENINGS WILL CAUSE AIR TO BE DRAWN INTO
THE ROOM THROUGH THE CHIMNEY, CAUSING POOR
COMBUSTION. SOOTING MAY RESULT IN SERIOUS DAMAGE
TO THE HEATER AND RISK OF FIRE OR EXPLOSION.
The input reduction is primarily achieved by reducing the size of the main burner orifices. To do this, the main burner orifices require replacement with orifices sized for the particular installation elevation. Correct orifice sizing and parts may be obtained from
A.O. Smith Water Products Company. When ordering, be sure to state the model number and the altitude of the location where the water heater is being installed.
Upon completion of derating of the heater, adjustment to the gas pressure regulator may be required. See CHECKING THE INPUT section in this manual for inlet and manifold pressure requirements.
Also due to the input rating reduction required at high altitudes, the output rating of the appliance is reduced and should be compensated for in the sizing of the equipment for application.
These heaters are approved for installation on combustible flooring in a closet having a ceiling 18" (457 mm) above top cover and with clearances to combustible construction of 6" (152 mm) from flue or vent connector, 1" (25 mm) at the sides and rear and
4" (102 mm) to front to prevent a possible fire hazard condition. A minimum of 4" (101.6 mm) shall be allowed for installation of serviceable parts.
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.
Contact your dealer or qualified service technician for more information on this product.
In buildings of conventional frame, brick, or stone construction, unconfined spaces may provide adequate air for combustion, ventilation and draft hood dilution.
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, ventilation and draft hood dilution must be obtained from outdoors.
The installation instructions for confined spaces in tightly constructed buildings must be followed to ensure adequate air supply.
When drawing combustion and dilution 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 (30.50 cm) OF THE ENCLOSURE TOP
AND ONE IN OR WITHIN 12 INCHES (30.50 cm) OF THE
ENCLOSURE BOTTOM. Each opening shall have a free area of at least one square inch per 1000 Btuh (2202.8 mm 2 /KW) of the total input of all appliances in the enclosure, but not less than
100 square inches (645 cm 2 ).
If the confined space is within a building of tight construction, air for combustion, ventilation, and draft hood dilution must be obtained from outdoors. When directly communicating with the outdoors or 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 (550.7 mm 2 /KW) 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 (1101.4 mm 2 /KW) of the total input of all appliances in the enclosure. For Canadian installations consult CAN/CSA
COMBINATION WATER (POTABLE)
HEATING AND SPACE HEATING
REFER TO THE LATEST EDITION OF THE "NATIONAL FUEL GAS
CODE" ANSI Z223.1/NFPA 54. FOR CANADA CONSULT CAN/CSA
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 Fig. 3).
A closed system will exist if a check valve (without bypass), pressure reducing valve (without bypass), or a water meter (without bypass) is installed in the cold water line between the water heater and street main (or well).
The draft hood furnished with this heater must be installed without alteration. Provision must be made if it is installed in confined space or a small room to accommodate draft hood spillage and avoid risks described in previous steps. The upper air opening called for in the AIR REQUIREMENTS section of this manual is for this purpose.
Excessive pressure may develop in such closed systems, causing premature tank failure or intermittent relief valve operation. This is not a warranty failure. An expansion tank or a similar device may be required in the inlet supply line between the appliance and the meter or valve to compensate for the thermal expansion of the water.
Locate draft hood as seen in Figure 1. Position draft hood over the flue tube. Align the draft hood legs with four holes surrounding the flue. Insert tabbed end of legs into the corresponding holes and twist to lock the draft hood in place.
When installing vent piping, secure the vent pipe to the draft hood using at least three sheet metal screws in the draft hood outlet.
The system installation must conform to these instructions and to the local code authority having jurisdiction. Good practice requires that all heavy piping be supported.
Vent connections must be made to an adequate stack or chimney.
Size and install proper size vent pipe. Do not reduce pipe size to less than that of the draft hood outlet.
THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST BE
FOLLOWED TO AVOID CHOKED COMBUSTION OR
RECIRCULATION OF FLUE GASES. SUCH CONDITIONS CAUSE
SOOTING OR RISKS OF FIRE AND ASPHYXIATION.
Horizontal runs of vent pipe must have a minimum upward slope toward the chimney of 1/4 inch per foot (20 mm per meter). Dampers or other obstructions must not be installed in between the heater and the draft hood. Be sure that the vent pipe does not extend beyond the inside wall of the chimney.
Heater must be protected from freezing downdrafts.
Remove all soot or other obstructions from the chimney that will retard a free draft.
Type B venting is recommended with these heaters.
Where a continuous or intermittent back draft is found to exist, the cause must be determined and corrected. A special vent cap may be required. If the back draft cannot be corrected by the normal methods or if a suitable draft cannot be obtained, a blower type flue gas exhauster must be employed to assure proper venting and correct combustion.
This water heater must be vented in compliance with all local codes, the current revision of the National Fuel Gas Code
(ANSI-Z223.1) and with the Category I Venting Tables. In Canada, venting shall conform to the requirements of the current CAN/CSA
B149.1-00 installation code.
THERMOMETERS (Not Supplied)
Thermometers should be obtained and field installed.
If any part of the vent system is exposed to ambient temperatures below 35 degrees F (2 degrees C) it must be insulated to prevent condensation.
Thermometers are installed in the system as a means of detecting the temperature of the outlet water supply.
• Do not connect the heater to a common vent or chimney with solid fuel burning equipment. This practice is prohibited by many local building codes as is the practice of venting gas fired equipment to the duct work of ventilation systems.
• Where a separate vent connection is not available and the vent pipe from the heater must be connected to a common vent with an oil burning furnace, the vent pipe should enter the smaller common vent or chimney at a point above the large vent pipe.
This water heater is equipped with a combination temperaturepressure relief valve that complies with the standard for relief valves and automatic gas shut-off devices for hot water supply system,
ANSI Z21.22, for Canada see CAN/CSA 149.1-00. FOR SAFE
OPERATION OF THE WATER HEATER, THE RELIEF VALVE(S)
MUST NOT BE REMOVED OR PLUGGED.
ASME ratings cover pressure relief capacities. A.G.A. ratings cover release rate with temperature actuation.
* INSTALL PER
CIRCULATING RETURN LINE CONNECTIONS
TEMPERED WATER LOOP, IF USED, CONNECT TO POINT "A".
STORED TEMPERATURE WATER LOOP, IF USED, CONNECT TO
COLD WATER INLET.
CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACK-FLOW
PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VALVE,
PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT
WATER SYSTEM MUST BE PROVIDED.
TEMPERATURE SETTING SHOULD NOT
EXCEED SAFE USE TEMPERATURE AT
FIXTURES. SEE TEMPERATURE REGULATION
ON PAGE 11. IF HIGHER PREHEAT
TEMPERATURES ARE NECESSARY TO OBTAIN
ADEQUATE BOOSTER OUTPUT, ADD AN
ANTI-SCALD VALVE FOR HOT WATER
SUPPLIED TO FIXTURES.
In addition to the appliance relief valve, each remote storage tank which may be used in conjunction with this appliance shall also be installed with a properly sized, rated and approved combination temperature (ANSI) and pressure (ASME) relief valve(s).
THE PURPOSE OF RELIEF VALVE IS TO AVOID EXCESSIVE
PRESSURE OR TEMPERATURE INTO THE STEAM RANGE,
WHICH MAY CAUSE SCALDING AT FIXTURES, TANK EXPLOSION,
SYSTEM OR HEATER DAMAGE. NO VALVE IS TO BE PLACED
BETWEEN THE RELIEF VALVE AND TANK.
Your local code authority may have other specific relief valve requirements.
A DRAIN LINE MUST BE CONNECTED TO THE RELIEF VALVE TO
DIRECT DISCHARGE TO A SAFE LOCATION TO AVOID SCALDING
OR WATER DAMAGE. THIS LINE MUST NOT BE REDUCED FROM
THE SIZE OF THE VALVE OUTLET AND MUST NOT CONTAIN
VALVES, RESTRICTIONS NOR SHOULD IT BE LOCATED IN
FREEZING AREAS. DO NOT THREAD OR CAP THE END OF THIS
LINE. RESTRICTED OR BLOCKED DISCHARGE WILL DEFEAT
THE PURPOSE OF THE VALVE AND IS UNSAFE. DISCHARGE
LINE SHALL BE INSTALLED TO ALLOW COMPLETE DRAINAGE
OF BOTH THE VALVE AND LINE.
See SERVICE INFORMATION section for procedure and precautions.
The type, size and location of the relief valve(s) must be in accordance with local codes. The location of the relief valve shown in Figure 3 is typical. The heater has a factory installed high temperature limit switch.
For circulating heaters, the separate storage vessel must have a temperature and pressure relief valve installed. This valve shall comply with the standard for relief valves and automatic gas shutoff devices for hot water supply systems.
Contact your local gas service company to ensure that adequate gas service is available and to review applicable installation codes for your area.
Size the main gas line in accordance with Table 1. The figures shown are for straight lengths of pipe at 0.5 in. W.C. pressure drop, which is considered normal for low pressure systems. Note:
Fittings such as elbows, tees and line regulators will add to the pipe pressure drop. Also refer to the latest version of the National
Fuel Gas Code. For Canadian installations consult Canadian
Installation Code CAN/CSA B149.1-00.
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER
THAN 10.5" W.C.(2.61 kPa) - NATURAL GAS, or 13.0" W.C.(3.23
kPa) -PROPANE GAS SUPPLY GAS PRESSURE. EXPOSURE TO
HIGHER SUPPLY PRESSURE MAY CAUSE DAMAGE TO THE GAS
VALVE WHICH COULD RESULT IN FIRE OR EXPLOSION. IF
OVERPRESSURE HAS OCCURRED SUCH AS THROUGH
IMPROPER TESTING OF GAS LINES OR EMERGENCY
MALFUNCTION OF THE SUPPLY SYSTEM, THE GAS VALVE MUST
BE CHECKED FOR SAFE OPERATION. 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.
IT IS IMPORTANT TO GUARD AGAINST GAS VALVE FOULING FROM
CONTAMINANTS IN THE GAS WAYS. SUCH FOULING MAY CAUSE
IMPROPER OPERATION, FIRE OR EXPLOSION.
IF COPPER SUPPLY LINES ARE USED THEY MUST BE
INTERNALLY TINNED AND CERTIFIED FOR GAS SERVICE.
BEFORE ATTACHING THE GAS LINE, BE SURE THAT ALL GAS
PIPE IS CLEAN ON THE INSIDE.
TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS SUPPLY
LINE, A DIRT LEG (SOMETIMES CALLED SEDIMENT TRAP OR
DRIP LEG) MUST BE INCORPORATED IN THE PIPING (SEE FIG.
4). THE DIRT LEG MUST BE READILY ACCESSIBLE AND NOT
SUBJECT TO FREEZING CONDITIONS. INSTALL IN
ACCORDANCE WITH RECOMMENDATIONS OF SERVING GAS
SUPPLIERS. REFER TO THE LATEST VERSION OF THE NATIONAL
FUEL GAS CODE. For Canadian installations consult Canadian
Installation Code CAN/CSA B149.1-00.
TABLE 1 - GAS SUPPLY LINE SIZES (IN INCHES)*
MAXIMUM CAPACITY OF PIPE IN
CUBIC FEET PER HOUR
NORMAL IRON PIPE SIZES (INCHES)
INPUT IN THOUSANDS BTU/HR
FEET 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2"
97 200 375 770 1180 2200 3520 6250 12800
82 170 320 660 990 1900 3000 5300 10900
73 151 285 580 900 1680 2650 4750 9700
66 138 260 530 810 1520 2400 4300 8800
61 125 240 490 750 1400 2250 3900 8100
57 118 220 460 690 1300 2050 3700 7500
53 110 205 430 650 1220 1950 3450 7200
50 103 195 400 620 1150 1850 3250 6700
NORMAL IRON PIPE SIZES (INCHES)
INPUT IN KW
METERS 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2"
51 105 199 410 615 1160 1845
73 142 278 428 805 1277 2255 4626
59 110 225 346 644 1031 1830 3748
50 94 193 290 556
44 83 170 264 492
40 76 155 237 445
37 70 143 220 410
35 64 135 202 381
32 60 126 190 357
703 1259 2577
659 1142 2372
600 1083 2196
571 1010 2108
To prevent damage, care must be taken not to apply too much torque when attaching gas supply pipe to gas valve inlet.
Apply joint compounds (pipe dope) sparingly and only to the male threads of pipe joints. Do not apply compounds to the first two threads. Use compounds resistant to the action of liquefied petroleum gases.
PRESSURE TESTING EXCEEDING 1/2 PSIG (3.45 Kpa). GAS
SUPPLY LINE MUST BE CAPPED WHEN DISCONNECTED FROM
THE HEATER. FOR TEST PRESSURES OF 1/2 PSIG
(3.45 Kpa) OR LESS THE APPLIANCE NEED NOT BE
DISCONNECTED, BUT MUST BE ISOLATED FROM THE SUPPLY
PRESSURE TEST BY CLOSING THE MANUAL GAS Shut-off VALVE.
Gas line purging is required with new piping or systems in which air has entered.
PURGING SHOULD BE PERFORMED BY PERSONS
EXPERIENCED IN THIS TYPE GAS SERVICE. TO AVOID RISK OF
FIRE OR EXPLOSION, PURGE DISCHARGE MUST NOT ENTER
CONFINED AREAS OR SPACES WHERE IGNITION CAN OCCUR.
THE AREA MUST BE WELL VENTILATED AND ALL SOURCES OF
IGNITION MUST BE INACTIVATED OR REMOVED.
GAS METER SIZE — NATURAL GAS ONLY
Be sure the gas meter has sufficient capacity to supply the full rated gas input of the water heater as well as the requirements of all other gas fired equipment supplied by the meter. If gas meter is too small, ask the gas company to install a larger meter having adequate capacity.
FIGURE 5 -THERMOSTAT FOR NATURAL GAS
BEFORE PLACING THE HEATER IN OPERATION, CHECK FOR
GAS LEAKAGE. Use soap and water solution or other material acceptable for the purpose in locating the leaks. DO NOT USE
MATCHES, CANDLES, FLAME OR OTHER SOURCES OF IGNITION
FOR THIS PURPOSE.
GAS PRESSURE REGULATOR
The gas pressure regulator is built into the gas valve and is equipped to operate on the gas specified on model and rating plate. The regulator is factory adjusted to deliver gas to burner at correct water column pressure allowing for a nominal pressure drop through the controls.
The minimum gas supply pressure for input adjustment is
5.0" W.C. (1.24 kPa) for natural gas or 11.0" W.C. (2.74 kPa) for propane gas.
FIGURE 4 - GAS PIPING AND DIRT LEG INSTALLATION
Do not subject the combination gas valve to inlet gas pressures of more than 10.5" W.C. (2.61 kPa) - natural gas or 13.0"
W.C. (3.23 kPa) - propane gas. A service regulator is necessary if higher gas pressures are encountered.
DISCONNECT THE HEATER AND ITS MANUAL GAS Shut-off VALVE
FROM THE GAS SUPPLY PIPING SYSTEM DURING ANY SUPPLY
Gas pressure specified in Table 2, refer to flow pressure taken at pressure tap of automatic gas valve while heater is operating.
MANIFOLD PRESSURE SETTING
Natural 65,000 Btu/hr
4.0 in. W.C.
Propane 55,000 Btu/hr 10.0 in. W.C.
THE GAS VALVE MUST HAVE BEEN IN THE OFF POSITION FOR
AT LEAST 5 MINUTES. This waiting period is an important safety step. Its purpose is to permit gas that may have accumulated in the combustion chamber to clear. IF YOU DETECT GAS ODOR AT
THE END OF THIS PERIOD DO NOT PROCEED WITH LIGHTING.
RECOGNIZE THAT GAS ODOR, EVEN IF IT SEEMS WEAK, MAY
INDICATE PRESENCE OF ACCUMULATED GAS SOMEPLACE IN
THE AREA WITH RISK OF FIRE OR EXPLOSION. SEE THE FRONT
PAGE FOR STEPS TO BE TAKEN.
Entire system filled with water.
Air purged from all lines and no leaks (gas and water).
All gas and water lines open.
It is recommended that a qualified person perform the initial firing of the heater. At this time the user should not hesitate to ask the individual any questions which he may have in regard to the operation and maintenance of the unit.
Before lighting the pilot and operating the heater, the following conditions must exist:
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDER
WATER. The heater must be replaced.
IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT
OPERATE HEATER UNTIL ALL CORRECTIVE STEPS HAVE BEEN
MADE BY A QUALIFIED SERVICEMAN:
FIRING WITHOUT WATER.
NEVER OPERATE THE HEATER WITHOUT FIRST BEING CERTAIN
IT IS FILLED WITH WATER AND AN A.G.A. TEMPERATURE AND
PRESSURE RELIEF VALVE IS INSTALLED IN THE RELIEF VALVE
OPENING OF THE HEATER.
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO
SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO
A checklist is included in the SERVICE INFORMATION section 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.
FOR YOUR SAFETY READ BEFORE LIGHTING
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 must be lighted by hand. When lighting the pilot, follow these instructions exactly.
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 SMELL GAS:
• 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 suppliers instructions.
• If you cannot reach your gas supplier, call the fire department.
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 service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water.
1. STOP! Read safety information above on this label.
2. Set the thermostat to lowest setting by turning the water temperature dial clockwise ( ) to its lowest temperature setting (with arrow on dial) as shown.
DO NOT FORCE.
3. Remove outer door.
Push in control knob all the way and hold down.
Immediately light the pilot with a match. Continue to hold control knob in for about one (1) minute after the pilot is lit. Release knob and it will pop back up. Pilot should remain lit. If it goes out, repeat steps 3 through 8.
• If knob does not pop up when released, stop and immediately call your service technician or gas supplier.
4. Turn gas control knob clockwise to “OFF” position. Knob cannot be turned from “PILOT” to “OFF” unless knob is depressed slightly. DO NOT FORCE.
5. 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 next step.
6. Remove (or open) inner door located below gas control unit.
7. Find pilot - follow metal tube from gas control. The pilot is located in front of the burner or on the right hand side of the burner.
8. If you don’t smell gas, turn knob on gas control counter clockwise to “PILOT” position.
• If the pilot will not stay lit after several tries, depress and turn the gas control knob clockwise to “OFF” and call your service technician or gas supplier.
10. Replace (or close) inner door. Replace outer door if door does not cover gas control on/off knob or temperature adjustment knob.
11. At arms length away, turn gas control knob counter- clockwise to the full “ON” position. WARNING: Do not use gas control
knob to regulate gas flow.
12. At arms length away, set the thermostat to desired setting. The mark ( ) indicative of approximate 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.
13. Replace the outer door if not replaced in step 10.
Hotter water increases the risk of scald injury. Before changing temperature setting see instruction manual.
TO TURN OFF GAS TO APPLIANCE
Set the thermostat to lowest setting by turning the water temperature dial clockwise ( ) to its lowest temperature setting (with arrow on dial) as shown. DO
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.
3. Replace outer door (if removed).
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO
SHUT OFF, TURN OFF THE MAIN MANUAL GAS Shut-off VALVE TO
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.
Time to Produce 2nd & 3rd
Degree Burns on Adult Skin
VERY HOT = APPROX.180°F (82°C)
D = APROX. 160°F (71°C)
C = APPROX.150°F (66°C)
B = APPROX.140°F (60°C)
A = APPROX.130°F (54°C)
= APPROX.120°F (49°C)
LOW = APPROX.100°F (38°C)
About 1/2 second
About 1 1/2 seconds
Less than 5 seconds
About 30 seconds
More than 5 minutes
- - - - - - - -
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, 5621
W. 115th Street, Alsip, IL 60803. In Canada contact A.O. Smith
Enterprises, Ltd., P.O. Box 310, 768 Erie Street, Stratford, Ontario
Canada N5A 6T3.
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 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
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 new control.
SETTING THE WATER HEATER TEMPERATURE AT 120°F (49°C)
(APPROX. " " MARK ON FACE OF THERMOSTAT) WILL REDUCE
THE RISK OF SCALDS. Some states require settings at specific lower temperatures.
The following steps shall be followed with each appliance connected to the venting system placed in operation, while any other appliances connected to the venting system are not in operation.
Figure 6 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 (17°C).
If you experience this type of use you should consider using lower temperature settings to reduce scald hazards.
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, ANSI Z223.1 or the
CAN/CGA B149 Installation codes and these instructions.
Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.
Valves for reducing point of use temperature by mixing cold and hot water are available. Also available are inexpensive devices that attach to faucets to limit hot water temperatures. Contact a licensed plumber or the local plumbing authority.
3. So far as is practical, close all building doors and windows and all doors between the space in which the water heater(s) connected to the venting system are located and other spaces
of the building. Turn on all appliances not connected to the venting system. Turn on all exhaust fans, such as range hoods and bathroom exhausts, so they shall operate at maximum speed. Close fireplace dampers.
4. Follow the lighting instruction. Place the water heater being inspected in operation. Adjust thermostat so appliance shall operate continuously.
5. Test for draft hood spillage at the relief opening after 5 minutes of main burner operation.
6. After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas burning appliance to their previous conditions of use.
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, remove the burner and clean with a soft brush. Clean main burner orifice with a suitable soft material. Do not disassemble burner head unless necessary.
CHECK FOR GOOD FLOW OF COMBUSTION AND VENTILATING
AIR TO THE UNIT. MAINTAIN A CLEAR OPEN AREA AROUND THE
HEATER AT ALL TIMES. DO NOT STORE COMBUSTIBLES OR
FLAMMABLE LIQUIDS NEAR OR AROUND AN APPLIANCE.
7. If improper venting is observed during any of the above tests, the venting system must be corrected.
FAILURE TO CORRECT BACK DRAFTS MAY CAUSE AIR
CONTAMINATION AND UNSAFE CONDITIONS.
PILOT AND MAIN BURNER
• If the back draft cannot be corrected by the normal method or if a suitable draft cannot be obtained, a blower type flue gas exhauster must be employed to assure proper venting and correct combustion.
The installer may be able to observe and correct certain problems which may arise when the unit is put into operation. HOWEVER, it is recommended that only qualified servicemen, using appropriate test equipment, be allowed to service the heater.
FOR YOUR SAFETY AND SATISFACTORY OPERATION, IT IS
RECOMMENDED THAT THIS HEATER BE CHECKED ONCE A
YEAR BY A COMPETENT SERVICE PERSON.
USERS OF THIS APPLIANCE SHOULD BE AWARE THAT GAS
COMPONENTS WEAR OUT OVER A PERIOD OF TIME. THE GAS
CARRYING COMPONENTS OF THIS APPLIANCE SHOULD BE
INSPECTED FOR PROPER OPERATION PERIODICALLY BY A
QUALIFIED SERVICE TECHNICIAN.
CHECKING GAS INPUT
For appliance installation locations with elevation above 2000 ft.(610m) refer to HIGH ALTITUDE INSTALLATIONS section of this manual for input reduction procedure.
With this heater in operation, determine whether it is receiving the full rated input of gas. This may be done by timing the gas meter and measuring gas pressure with a gauge or manometer. When the heater is operating at full capacity (full gas input) it should consume approximately 1 cubic foot of gas in the time shown in table 3.
INPUT CHECK TIME REQUIRED TO
CONSUME 1 CU. FT. OF GAS
Time Required To
Consume 1 Cu. Ft.
PILOT AND MAIN BURNER
Check pilot, figure 7, and main burner at least every 6 months for proper flame characteristics. The main burner should display the following characteristics:
1. Provide complete combustion of gas.
2. Cause rapid ignition and carryover of flame across entire burner.
3. Give reasonably quiet operation during ignition, burning and extinction.
4. Cause no excessive lifting of flames from burner ports.
If preceding burner characteristics are not evident, check for accumulation of lint or other foreign material that restricts or blocks the air openings to the heater or burner.
Use this formula to “clock” the meter. Be sure that other gas consuming appliances are not operating during this interval.
3,600 X H = Btuh
T = Time in seconds needed to burn one cubic foot of gas.
H = Heating value of gas in Btu’s per cubic foot of gas.
Btuh = Actual heater input rate.
Example: (Using BT-65 heater)
T = 58.2 seconds/ft
H = 1,050 Btu/ft
Btuh = ?
3,600 X 1,050 = 64.948 Btu/hr (19.0 KW)
Compare the actual input rate to that given on the heater’s rating plate. In the example, the BT-65’s full input rate should be
65,000 Btuh (19.0 KW) for natural gas.
diameter core wire is visible as this means that the anode material has been expended in the control of corrosion.
Examine the venting system every 6 months for obstructions and/ or deterioration of vent piping.
NOTE: Anode rod inspection may need to be made more
frequently in areas subject to acid rain that obtains their water supply from surface water as the low pH will accelerate anode activity.
CAUTION: Close cold water inlet valve serving heater and open
nearby hot water faucet to relieve the pressure in the heater before attempting to remove anode(s) for inspection.
At least once a year the temperature and pressure relief valve should be checked to ensure that it is in operating condition.
(During manual operation of this valve, avoid any contact with hot water and take preventive steps for water damage). Lift the lever at the top of the valve several times until the valve seats properly and operates freely.
In regions where freezing weather is encountered, all water must be drained from unit and piping when out of service (water shut off). Drain valve must be left open until unit is returned to service.
THE WATER PASSING OUT OF THE VALVE DURING THIS
CHECKING OPERATION MAY BE EXTREMELY HOT. AVOID
CONTACT AND DISCHARGE SAFELY TO PREVENT WATER
If the temperature and pressure relief valve on the heater discharges periodically or continuously, a problem exists. This may be due to unusually high water temperatures or pressures in the system, or to a faulty relief valve. Contact your dealer or a qualified service technician to find the cause of the problem and to correct it. This may also 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 TEMPERATURE
AND PRESSURE RELIEF VALVE.
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO
SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO
Replacement parts may be ordered through A. O. Smith dealers, authorized servicers or distributors. Refer to the Yellow Pages for where to call or contact the A. O. Smith Water Products Company,
5621 West 115th Street, Alsip, Illinois 60803, 1-800-433-2545. In
Canada contact A.O. Smith Enterprises Ltd., P.O. Box 310, 768
Erie Street, Stratford, Ontario N5A 6T3, 519-271-5800. When ordering parts, be sure to state the quantity, part number and description of the item including the complete model and serial number as it appears on the product. Refer to the parts list for more information.
Before contacting your dealer, check the water heater to see if the apparent malfunction is caused by some external fault. Consulting this checklist may eliminate the need for a repair call and restore hot water service.
NOT ENOUGH OR NO HOT WATER
HOT WATER ODOR
1. Check to see if the pilot flame is lit.
On occasion, hot water may develop a strong odor. If this occurs drain the heater completely, flush thoroughly, and refill. If the problem persists, chlorination of the heater and replacement of the factory installed magnesium anode with an aluminum anode may correct the condition.
• To relight the pilot, follow the instructions on the heater or in this manual.
• Check to see if the main gas Shut-off valve in the gas supply pipe is partially closed or the water temperature dial is set too low.
Occasionally water softener companies recommend removal of heater anodes for odor reasons.
2. Look for leaking or open hot water faucets. Check for excessive usage.
Unauthorized removal of heater anode will void the warranty.
Replace the anode as necessary to maintain corrosion protection.
For further information contact your dealer.
3. Your gas company can check the gas input to the heater to see that it is correct. An underfired heater will not produce hot water at its normal recovery rate.
ANODE ROD INSPECTION
4. If the heater was installed when incoming water temperatures were warm, colder incoming temperatures will create the effect of less hot water.
The heater tank is equipped with an anode rod to provide corrosion control. At least once a year the anode rod should be checked to determine if replacement is necessary. Initially the anode rod is approximately 7/8" (22mm) in diameter with a 1/8" (3mm) diameter steel core wire running down the center of the anode material.
THE ANODE SHOULD BE REPLACED when the 1/8" (3mm)
5. The thermostat water temperature adjusting dial may be set too low.
6. If you cannot determine the cause of the problems, contact your dealer.
WATER TEMPERATURE IS TOO HOT
1. The thermostat water temperature adjusting dial may be set too high.
2. If lowering control setting does not reduce the water temperature contact your dealer.
GAS SMELL AT THE HEATER
1. Close the main Shut-off valve in the gas supply pipe near the heater, see fig. 4 on page 8. The thermostat includes a gas control (top knob) which can also be closed.
2. Call your gas company.
WATER LEAKAGE IS SUSPECTED
1. Check to see if the heater drain valve is tightly closed.
2. The apparent leakage might be condensation. In warm or humid locations, condensation can accumulate and run from within the heater or its piping.
• When a water heater is first installed and filled, the bottom of the tank might condense water. The water accumulation, if excessive, can drip into the floor shield. Also, during normal operation there may be occasions when large quantities of water are drawn, chilling the tank bottom. This too can result in condensation.
Condensation, appearing in the vent pipe (water dripping from draft diverter) during heater operation is evidence of poor vent action. Possible causes are too long a vent pipe or improper chimney operation.
3. If the leakage is from the temperature and pressure relief valve or its discharge pipe, it may represent a normal condition.
However, see RELIEF VALVE section on page 12. DO NOT
PLUG THE TEMPERATURE AND PRESSURE RELIEF VALVE.
Also, the leakage could be due to unusually high water pressures or temperatures in the system, or to a faulty relief valve. Your dealer or a qualified service technician should be called to determine the cause of the problem and to correct it.
4. If you cannot identify or correct the source of water leakage:
• Close the main Shut-off valve in the gas supply pipe at the heater. See fig. 4, page 8.
• Close the valve which feeds water to the cold water inlet at the top of the heater.
• Contact your dealer.
WATER HEATER MAKES SOUNDS
1. Occasional excessive condensation, as explained under
LEAKAGE, can cause a sizzling sound as the moisture is vaporized by the gas flame. This is a normal sound and may be disregarded.
2. Sediment and water scale accumulations may cause rumbling noises. Contact your dealer for details of flushing the heater.
3. If you cannot identify or remedy the condition, contact your dealer.
Model BT Limited Warranty
A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater.
If the glass-lined tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corrosion from potable water therein, during the first THREE years after initial installation, the warrantor will supply a complete new A. O. Smith water heater of equivalent size and current model. Some government agencies are requiring energy efficient standards for water heaters. In the event regulations prohibit sale of a model of equivalent size and construction, A. O. Smith will provide a model which complies with the regulations of your area, in which case the consumer will be charged the difference in price between the like replacement and the energy efficient model required. The warranty on the replacement water heater will be limited to the unexpired term of the original warranty.
ALL OTHER PARTS
If within ONE year after initial installation of this water heater, any part or portion shall prove upon examination by the warrantor to be defective in material or workmanship, the warrantor will repair or replace such part or portion at its option.
CONDITIONS AND EXCEPTIONS
This warranty shall apply only when the water heater is installed in accordance with local plumbing and building codes, ordinances and regulations, the printed instructions provided with it and good industry practices. In addition, a temperature and pressure relief valve, certified by an officially sanctioned and recognized independent testing agency and approved by the American Society of Mechanical Engineers, must have been installed.
This warranty shall apply only when the heater is:
(1) used at temperatures not exceeding the maximum calibrated setting of its thermostat;
(2) used at water pressure not exceeding the working pressure shown on the heater;
(3) filled with potable water, free to circulate at all times and with the tank free of damaging water sediment or scale deposits;
(4) used in a non-corrosive and non-contaminated atmosphere;
(5) used with factory approved anode(s) installed;
(6) in its original installation location;
(7) in the United States, its territories or possessions, and Canada;
(8) sized in accordance with proper sizing techniques for commercial and/or residential water heaters;
(9) bearing a rating plate which has not been altered, defaced or removed, except as required by the warrantor;
(10) operated with properly installed dirt leg;
(11) fired with the fuel for which it was factory built;
(12) fired at the factory rated input;
(13) operated with the inner and outer combustion chamber doors in place;
(14) used when operated free of the damaging effects of uncontrolled water hammer.
Any accident to the water heater, any misuse, abuse (including freezing or thermal expansion damage) or alteration of, any operation in a modified form, or any attempt to repair tank leaks will void this warranty.
This warranty is void if a device acting as a backflow prevention device (check valves etc.) is installed in the cold water supply the heater is connected to, unless an effective method of controlling thermal expansion is also installed at the heater(s) and operational at all times. The relief valve installed on the heater is not an acceptable method.
This warranty shall be void and shall have no effect if the design or structure of the water heater is, or is attempted to be modified or altered in any way, including, but not limited to, by attaching non-company approved appliances or equipment.
SERVICE AND REPAIR EXPENSES
Under the limited warranty the warrantor will provide only a replacement water heater or part thereof. The owner is responsible for all other costs.
Such costs may include but are not limited to: a.
Labor charges for service removal, repair or reinstallation of the water heater or any component part; b.
Shipping, delivery, handling, and administrative charges for forwarding the new heater or replacement part from the nearest distributor and returning the claimed defective heater or part to such distributor.
All cost necessary or incidental for any material and/or permits required for installation of the replacement heater or part.
LIMITATIONS ON IMPLIED WARRANTIES
Implied warranties, including the warranty of merchantability imposed on the sale of this heater under state or provincial law are limited to one (1) year duration for the heater or any of its parts. Some states or provinces do not allow limitation on how long an implied warranty lasts, so the above limitation may not apply to you.
Any claim under the 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 practicable, the owner should contact:
A. O. Smith Water Products Company
5621 West 115th Street
Alsip, IL 60803
A. O. Smith Enterprises Ltd.
P. O. Box, 310 - 768 Erie Street
Stratford, Ontario N5A 6T3
Telephone: 800-265-8520 a.
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.
NO OTHER 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. 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.
Some states and provinces do not allow the exclusion or limitation of the incidental or consequential damage, so the above limitations or exclusions 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 or from province to province.
Fill in the following for your own reference. Keep it. Registration is not a condition of warranty. The model and serial number are found on the heater’s rating plate.
Model No. ____________________Serial No. _____________________________________________Date Installed___________________________
Dealer’s Address ________________________________________________________________________ Phone No.________________________
City and State/Province __________________________________________________________________________ Zip/Postal Code_____________
KEEP THIS WARRANTY POSTED ADJACENT TO THE HEATER FOR FUTURE REFERENCE.
PRODUCT SERVICE DIVISION
5621 W. 115TH STREET, ALSIP, IL 60803
PHONE: 1-800-433-2545 FAX: 1-800-433-2515
E-MAIL: [email protected]
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