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MODEL BT- 65
COMMERCIAL GAS WATER HEATER
Glass-Lined Tank-type Water Heater
• INSTALLATION • OPERATION • SERVICE • MAINTENANCE • LIMITED WARRANTY
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.
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.
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CAUTION
PLEASE READ THOROUGHLY
www.hotwater.com
PART NO. 195701-000
SUPERSEDES PART NO. 194975-000
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ROUGH-IN-DIMENSIONS
DIMENSIONS
Model A B C D E F G H J
BT-65
In. 63 1/2 61 26 22 4 8 3/4 1/2 53 3/4
mm 1613 1550 660 559 106 203 NPT NPT 1,365
RECOVERY CAPACITIES
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°
BT-65
BT-65
Natural
Propane
65,000 65 US Gals. GPH 299 200 150 120 100 86 75 67 60 54 50 46 43
19.0 246 Litres LPH 1133 756 567 453 378 324 283 252 227 206 189 174 162
55.000 65 US Gals. GPH 253 169 127 101 84 72 63 56 51 46 42 39 36
16.1 246 Litres LPH 959 639 479 384 320 274 240 213 192 174 160 48 137
RECOVERY CAPACITIES
FOREWORD
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
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.
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TABLE OF CONTENTS
Page
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
Page
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
GENERAL SAFETY
INFORMATION
PRECAUTIONS
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.
IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT
OPERATE HEATER UNTIL ALL CORRECTIVE STEPS HAVE BEEN
MADE BY A QUALIFIED SERVICEMAN.
1. EXTERNAL FIRE.
2. DAMAGE.
3. FIRING WITHOUT WATER.
4. SOOTING
LIQUID PETROLEUM MODELS
WARNING
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.
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.)
IMPROPER COMBUSTION
WARNING
ATTIC AND/OR EXHAUST FANS OPERATING ON THE PREMISES
WITH A WATER HEATER CAN RESULT IN CARBON MONOXIDE
POISONING AND DEATH.
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.
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.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND
VENTILATING AIR. ADEQUATE AIR FOR COMBUSTION AND
VENTILATION MUST BE PROVIDED FOR SAFE OPERATION.
CHEMICAL VAPOR CORROSION
WARNING
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
EXTENDED NON-USE PERIODS
WARNING
HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM
SERVED BY THIS HEATER THAT HAS NOT BEEN
LONG PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE).
HYDROGEN GAS IS EXTREMELY FLAMMABLE.
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
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USED FOR A
To reduce the risk
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THERE SHOULD BE NO SMOKING OR OPEN FLAME NEAR
to flow.
THE FAUCET AT THE TIME IT IS OPEN.
INSULATION BLANKETS
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.
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 INSTALL THIS WATER HEATER DIRECTLY ON A
CARPETED FLOOR. A FIRE HAZARD MAY RESULT.
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.
THIS HEATER SHALL BE LOCATED OR PROTECTED SO IT IS
NOT SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.
WARNING
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.
Instead the
Do not apply insulation to the top of the water heater, as this will
•
interfere with safe operation of the draft hood.
Do not cover the outer door, thermostat or temperature &
•
pressure relief valve.
•
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.
INSTALLATION INSTRUCTIONS
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 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.
WARNING
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.
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.
SOME LOCAL CODES PERMIT OPERATION OF GAS
THE HEATER MUST NOT BE LOCATED IN AN AREA WHERE IT
WILL BE SUBJECT TO FREEZING.
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.
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.
HIGH ALTITUDE INSTALLATIONS
WARNING
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.
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.
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U.S. REQUIREMENTS
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).
CANADIAN REQUIREMENTS
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.
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.
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE
MATERIALS, GASOLINE AND OTHER FLAMMABLES, VAPORS AND
LIQUIDS.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION OR
VENTILATING AIR.
WARNING
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
ASPHYXIATION.
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.
UNCONFINED SPACE
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.
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.
CLEARANCES
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.
HARD WATER
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.
AIR REQUIREMENTS
REFER TO THE LATEST EDITION OF THE "NATIONAL FUEL GAS
CODE" ANSI Z223.1/NFPA 54. FOR CANADA CONSULT CAN/CSA
B149.1-00.
CONFINED SPACE
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
input of all appliances in the enclosure, but not less than
100 square inches (645 cm
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
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
in the enclosure. For Canadian installations consult CAN/CSA
B149.1-00.
2
).
2
/KW) of the total input of all
2
/KW) of the total input of all appliances
2
/KW) of the total
COMBINATION WATER (POTABLE)
HEATING AND SPACE HEATING
1. All piping components connected to this unit for space heating
applications shall be suitable for use with potable water.
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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).
CAUTION
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).
Excessive pressure may develop in such closed systems, causing
premature tank failure or intermittent relief valve operation.
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.
This is
FIGURE 2
DRAFT HOOD
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.
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.
SYSTEM CONNECTIONS
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.
VENTING
WARNING
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.
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.
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.
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.
• 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.
When installing vent piping, secure the vent pipe to the draft hood
using at least three sheet metal screws in the draft hood outlet.
VENT CONNECTION
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.
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.
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.
THERMOMETERS (Not Supplied)
Thermometers should be obtained and field installed.
Thermometers are installed in the system as a means of detecting
the temperature of the outlet water supply.
RELIEF VALVE
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.
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.
FOR SAFE
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SINGLE TEMPERATURE
VACUUM RELIEF
VALV E
* INSTALL PER
LOCAL CODES
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.
FIGURE 3
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).
WARNING
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.
WARNING
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.
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.
WARNING
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.
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.
GAS PIPING
Contact your local gas service company to ensure that adequate
gas service is available and to review applicable installation codes
for your area.
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.
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TABLE 1 - GAS SUPPLY LINE SIZES (IN INCHES)*
MAXIMUM CAPACITY OF PIPE IN
CUBIC FEET PER HOUR
LENGTH NORMAL IRON PIPE SIZES (INCHES)
IN INPUT IN THOUSANDS BTU/HR
FEET 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3" 4"
10 175 360 680 1400 2100 3960 6300 11000 23000
20 120 250 485 950 1460 2750 4360 7700 15800
30 97 200 375 770 1180 2200 3520 6250 12800
40 82 170 320 660 990 1900 3000 5300 10900
50 73 151 285 580 900 1680 2650 4750 9700
60 66 138 260 530 810 1520 2400 4300 8800
70 61 125 240 490 750 1400 2250 3900 8100
80 57 118 220 460 690 1300 2050 3700 7500
90 53 110 205 430 650 1220 1950 3450 7200
100 50 103 195 400 620 1150 1850 3250 6700
125 44 93 175 360 550 1020 1650 2950 6000
150 40 84 160 325 500 950 1500 2650 5500
175 37 77 145 300 460 850 1370 2450 5000
200 35 72 135 280 430 800 1280 2280 4600
LENGTH NORMAL IRON PIPE SIZES (INCHES)
IN INPUT IN KW
METERS 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3" 4"
3 51 105 199 410 615 1160 1845 3221 6735
6 35 73 142 278 428 805 1277 2255 4626
9 28 59 110 225 346 644 1031 1830 3748
12 24 50 94 193 290 556 878 1552 3192
15 21 44 83 170 264 492 776 1391 2840
18 19 40 76 155 237 445 703 1259 2577
21 18 37 70 143 220 410 659 1142 2372
24 17 35 64 135 202 381 600 1083 2196
27 16 32 60 126 190 357 571 1010 2108
31 15 30 57 117 182 337 542 952 1962
38 13 27 51 105 161 299 483 864 1757
46 12 25 47 95 146 278 439 776 1610
53 11 23 42 88 135 249 401 717 1464
61 10 21 40 82 126 234 375 688 1347
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.
PURGING
Gas line purging is required with new piping or systems in which
air has entered.
CAUTION
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.
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.
BEFORE PLACING THE HEATER IN OPERATION, CHECK FOR
GAS LEAKAGE.
acceptable for the purpose in locating the leaks.
Use soap and water solution or other material
DO NOT USE
MATCHES, CANDLES, FLAME OR OTHER SOURCES OF IGNITION
FOR THIS PURPOSE.
FIGURE 4 - GAS PIPING AND DIRT LEG INSTALLATION
DISCONNECT THE HEATER AND ITS MANUAL GAS Shut-off VALVE
FROM THE GAS SUPPLY PIPING SYSTEM DURING ANY SUPPLY
FIGURE 5 -THERMOSTAT FOR NATURAL GAS
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.
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.
Gas pressure specified in Table 2, refer to flow pressure taken at
pressure tap of automatic gas valve while heater is operating.
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TABLE 2
MANIFOLD PRESSURE SETTING
Model Type of Manifold
Number Gas Input Pressure
BT-65 Natural 65,000 Btu/hr 4.0 in. W.C.
16.7 KW/hr 1.0 Kpa
BT-65 Propane 55,000 Btu/hr 10.0 in. W.C.
16Kw 2.49kPa
OPERATION
• Entire system filled with water.
• Air purged from all lines and no leaks (gas and water).
• All gas and water lines open.
PRECAUTIONS
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:
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.
WARNING
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.
Before lighting the pilot and operating the heater, the following
conditions must exist:
1. EXTERNAL FIRE.
2. PHYSICAL DAMAGE.
3. FIRING WITHOUT WATER.
4. SOOTING.
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
THE APPLIANCE.
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.
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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 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.
LIGHTING INSTRUCTIONS
1. STOP! Read safety information above on this label.
2. Set the thermostat to lowest setting by turning the
water temperature dial clockwise (
temperature setting (with arrow on dial) as shown.
DO NOT FORCE.
3. Remove outer door.
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.
PILOT
BURNER
8. If you don’t smell gas, turn knob on gas control counter
clockwise to “PILOT” position.
OR
) to its lowest
PILOT
BURNER
*THERMOCOUPLE
• 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.
9. 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.
• 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 (
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.
) indicative of
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 by turning the water
temperature dial clockwise (
temperature setting (with arrow on dial) as shown. DO
NOT FORCE.
) to its lowest
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).
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TEMPERATURE REGULATION
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.
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.
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
reduces temperature.
increases temperature and clockwise
Suitable covers
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO
SHUT OFF, TURN OFF THE MAIN MANUAL GAS Shut-off VALVE TO
THE APPLIANCE.
Temperature Time to Produce 2nd & 3rd
Setting Degree Burns on Adult Skin
VERY HOT = APPROX.180°F (82°C) Nearly instantaneous
D = APROX. 160°F (71°C) About 1/2 second
C = APPROX.150°F (66°C) About 1 1/2 seconds
B = APPROX.140°F (60°C) Less than 5 seconds
A = APPROX.130°F (54°C) About 30 seconds
= APPROX.120°F (49°C) More than 5 minutes
LOW = APPROX.100°F (38°C) - - - - - - - -
FIGURE 6
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.
CHECKING VENTING
SETTING THE WATER HEATER TEMPERATURE AT 120°F (49°C)
(APPROX. "
THE RISK OF SCALDS. Some states require settings at specific
lower temperatures.
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.
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.
" MARK ON FACE OF THERMOSTAT) WILL REDUCE
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.
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.
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
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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.
7. If improper venting is observed during any of the above tests,
the venting system must be corrected.
WARNING
FAILURE TO CORRECT BACK DRAFTS MAY CAUSE AIR
CONTAMINATION AND UNSAFE CONDITIONS.
• 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.
SERVICE INFORMATION
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.
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,
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.
PILOT AND MAIN BURNER
FIGURE 7
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.
TABLE 3
INPUT CHECK TIME REQUIRED TO
CONSUME 1 CU. FT. OF GAS
Time Required To
Type of BTU Per Consume 1 Cu. Ft.
Model Gas Cu. Ft. of Gas
BT-65 Natural 1050 58.2 sec.
BT-65 Propane 2500 163.7 sec.
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
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/ft3 (natural gas)
Btuh = ?
3,600 X 1,050 = 64.948 Btu/hr (19.0 KW)
58.2
12
3
Page 13
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.
VENT SYSTEM
Examine the venting system every 6 months for obstructions and/
or deterioration of vent piping.
RELIEF VALVE
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.
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.
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.
AND PRESSURE RELIEF VALVE.
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO
SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO
THE APPLIANCE.
DO NOT PLUG THE TEMPERATURE
WARNING
diameter core wire is visible as this means that the anode material
has been expended in the control of corrosion.
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.
WINTER PROTECTION
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.
REPLACEMENT PARTS
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
number as it appears on the product. Refer to the parts list for
more information.
including the complete model and serial
CHECKLIST
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
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.
Occasionally water softener companies recommend removal of
heater anodes for odor reasons.
CAUTION
Unauthorized removal of heater anode will void the warranty.
Replace the anode as necessary to maintain corrosion protection.
For further information contact your dealer.
ANODE ROD INSPECTION
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)
1. Check to see if the pilot flame is lit.
• 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.
2. Look for leaking or open hot water faucets. Check for excessive
usage.
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.
4. If the heater was installed when incoming water temperatures
were warm, colder incoming temperatures will create the effect
of less hot water.
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.
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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.
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.
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
• 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.
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Page 15
Model BT Limited Warranty
A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater.
1. THE TANK
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.
2. 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.
3. 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.
a. 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.
b. 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.
c. 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.
d. 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.
4. 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.
c. All cost necessary or incidental for any material and/or permits required for installation of the replacement heater or part.
5. 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.
6. CLAIM PROCEDURE
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 A. O. Smith Enterprises Ltd.
a. The warrantor will only honor replacement with identical or similar water heater or parts thereof which are manufactured or distributed by the
warrantor.
b. Dealer replacements are made subject to in-warranty validation by warrantor.
7. DISCLAIMERS
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.
a. 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.
b. 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 Name____________________________________________________________________________________________________________
Dealer’s Address ________________________________________________________________________ Phone No.________________________
City and State/Province __________________________________________________________________________ Zip/Postal Code_____________
U.S. Customers Canadian Customers
5621 West 115th Street P. O. Box, 310 - 768 Erie Street
Alsip, IL 60803 Stratford, Ontario N5A 6T3
Telephone: 800-323-2636 Telephone: 800-265-8520
KEEP THIS WARRANTY POSTED ADJACENT TO THE HEATER FOR FUTURE REFERENCE.
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REPLACEMENT PARTS
PRODUCT SERVICE DIVISION
5621 W. 115TH STREET, ALSIP, IL 60803
PHONE: 1-800-433-2545 FAX: 1-800-433-2515
E-MAIL: parts@hotwater.com
www.hotwater.com
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