A.O. Smith BT- 65 Instruction manual

A.O. Smith BT- 65 Instruction manual
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.
CAUTION
TEXT PRINTED OR OUTLINED IN RED CONTAINS
INFORMATION RELATIVE TO YOUR SAFETY.
PLEASE READ THOROUGHLY BEFORE
INSTALLING AND USING THIS APPLIANCE.
A DIVISION OF A.O. SMITH CORPORATION
McBEE, SOUTH CAROLINA, USA
STRATFORD, ONTARIO, CANADA
www.hotwater.com
PRINTED IN U.S.A. 0800
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER
AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
1
PART NO. 194427-000
SUPERSEDES PART NO. 183394-000
ROUGH-IN DIMENSIONS
FIGURE 1
DIMENSIONS
Model Units
A
B
C
D
BT-65 Inches 60 1/2 56 1/4 24 1/4 20 1/4
cm 153.7 142.9 61.6
51.4
E
4
10.2
F
8
20.3
G
3/4
1.9
I
1/2
NPT
70
80
90
100
110
17
22
28
33
39
44
50
189 142 113 95
81
71
63
716 537 429 358 307 268 239
56
57
215
61
67 72
78
52
47 44
41
195 179 165 153
RECOVERY CAPACITIES
Input
Rating Rating
Model Btu/Hr KW/Hr
BT 65 60,000 17.6
Approx.
Gal.
Cap.
48
Approx. Rise °F
Liter
Cap.
Temp° C
182
GPH
LPH
30
40
50
60
120 130 140
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.
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 149.1
-00. Both are available from the Canadian Standards Association,
8501 East Pleasant Valley Road, Cleveland, OH 44131. The
National Fuel Gas Code, ANSI Z223.1/NFPA 54 is available from
the National Fire Protection Association, 1 Batterymarch Park,
Quincy, MA 02269.
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
2
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 .............................................................................. 5-6
Combination Water (Potable) Heating and Space Heating .............. 6
Venting .............................................................................................. 6
Thermometers (Not Supplied) .......................................................... 6
Relief Valve ....................................................................................... 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
Spray can propellants, cleaning solvents, refrigerator and air
conditioning refrigerants, swimming pool chemicals, calcium and
sodium chloride (water softener salt), waxes, and process
chemicals are typical compounds which are potentially corrosive.
Do not store products of this sort near the heater. Also, air which is
brought in contact with the heater should not contain any of these
chemicals. If necessary, uncontaminated air should be obtained
from remote or outside sources. The limited warranty is voided
when failure of water heater is due to a corrosive atmosphere.
(Refer to the limited warranty for complete terms and conditions.)
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.
IMPROPER COMBUSTION
IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT
OPERATE HEATER UNTIL ALL CORRECTIVE STEPS HAVE BEEN
MADE BY A QUALIFIED SERVICEMAN.
1.
2.
3.
4.
WARNING
ATTIC AND/OR EXHAUST FANS OPERATING ON THE PREMISES
WITH A WATER HEATER CAN RESULT IN CARBON MONOXIDE
POISONING AND DEATH.
EXTERNAL FIRE.
DAMAGE.
FIRING WITHOUT WATER.
SOOTING
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
WARNING
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.
BT-65 models are not available for use with Liquified Petroleum,
or LP gas. If you have obtained a BT-65 model with the intent to
use it with Liquified Petroleum, LP gas - STOP. Immediately contact
your dealer to obtain a correct model.
EXTENDED NON-USE PERIODS
CHEMICAL VAPOR CORROSION
WARNING
HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM
SERVED BY THIS HEATER THAT HAS NOT BEEN USED FOR A
LONG PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE).
HYDROGEN GAS IS EXTREMELY FLAMMABLE. To reduce the risk
of injury under these conditions, it is recommended that the hot
water faucet be opened for several minutes at the kitchen sink
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.
3
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.
EXPLOSION. SOME LOCAL CODES PERMIT OPERATION OF GAS
APPLIANCES IF INSTALLED 18 INCHES (46CM) OR MORE ABOVE
THE FLOOR. THIS MAY REDUCE THE RISK IF LOCATION IN
SUCH AN AREA CANNOT BE AVOIDED.
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 (7.6.cm) 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
Insulation blankets available to the general public for external use
on gas water heaters are not approved for use on your A.O. Smith
water heater. The purpose of an insulation blanket is to reduce the
standby heat loss encountered with storage tank water heaters.
Your A.O. Smith water heater meets or exceeds the ASHRAE/IES
90.1b-1992 standards with respect to insulation and standby loss
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.
WARNING
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.
Should you choose to apply an insulation blanket to this heater,
you should follow these instructions. Failure to follow these
instructions can result in fire, asphyxiation, serious personal injury
or death.
•
Do not apply insulation to the top 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" (5cm) 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.
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" (5cm) deep,
with length and width at least 2" (5cm) 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.
INSTALLATION INSTRUCTIONS
REQUIRED ABILITY
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.
HIGH ALTITUDE INSTALLATIONS
LOCATING THE HEATER
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.
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
You should contact your gas supplier for any specific changes
which may be required in your area.
4
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.
See MAINTENANCE section for details of tank cleanout procedure.
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.
U.S. REQUIREMENTS
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE
MATERIALS, GASOLINE AND OTHER FLAMMABLES, VAPORS AND
LIQUIDS.
Ratings specified by manufacturers for most appliances apply for
elevations up to 2000 feet (610m). For elevations above 2000 feet
(610), ratings must be reduced at the rate of 4% for each 1000 feet
(305m) above sea level. For example, if a heater is rated at 78,000
Btuh (22.9 Kwh) at sea level, to rate the heater at 4000 feet (1219m),
you subtract 4 (once for each thousand feet) x.04 (4% input
reduction) x 78,000 (original rating) from the original rating.
Therefore, to calculate the input rating at 4,000 feet (1219m): 4 x
.04 x 78,000 = 12,480 Btuh (3.7 Kwh), 78,000 (22.9 Kwh) - 12,480
(3.7 Kwh) = 65,520 Btuh (19.2 Kwh). At 6000 feet (1829m) the
correct input rating should be 59,280 Btuh (17.4 Kwh).
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.
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' (610m)
elevation. For operation between 2000' (610m) and 4500' (1370m)
specify "HIGH ALTITUDE OPERATION" when ordering the heater(s).
For operation above 4500' (2370m) consult factory before ordering.
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.
Field conversion for operation at altitudes other than that
specified on the heater rating plate is not permitted.
UNCONFINED SPACE
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.
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.
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.
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 (30.48cm) OF THE ENCLOSURE TOP
AND ONE IN OR WITHIN 12 INCHES (30.48cm) OF THE
ENCLOSURE BOTTOM. Each opening shall have a free area of at
least one square inch per 1000 Btuh (6.45 square cm) of the total
input of all appliances in the enclosure, but not less than 100
square inches (645 square cm, 293 Kwh).
CLEARANCES
These heaters are approved for installation on combustible flooring
in a closet having a ceiling 12" (30.5cm) above top cover and with
clearances to combustible construction of 6" (15.2cm) from flue or
vent connector, 0" (0cm) at the sides and rear and 4" (10.1cm) to
front to prevent a possible fire hazard condition. A minimum of 4"
(10.1cm) shall be allowed for installation of serviceable parts.
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 (6.45 square cm) per 4000 Btuh (1.17 Kwh) 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
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.
5
square inch (6.45 square cm) per 2000 Btuh (.58 Kwh) of the total
input of all appliances in the enclosure. For Canadian installations
consult CAN/CSA B149.1-00.
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.
2. Toxic chemicals, such as those used for boiler treatment, shall
NEVER be introduced into this system.
•
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.
CORRECT METHOD
OF VENT PIPE
INSTALLATION
3. This unit may NEVER be connected to any existing heating
system or component(s) previously used with a non-potable
water heating appliance.
INCORRECT INSTALLATION
WITH NO UPWARD
ANGLE
PROVIDE MAXIMUM VERTICAL RISE OF VENT PIPE DIRECTLY ABOVE
HEATER DRAFT HOOD BEFORE TURNING INTO HORIZONTAL RUN.
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).
FIGURE 2
DRAFT HOOD
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).
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 2. Remove the two draft hood
screws from top of heater located just outside of the flue tube
opening. Position draft hood over the flue tube. Align the two holes
in the draft hood legs with the screw holes in the top of heater.
Insert the tabbed draft hood legs into the corresponding tab holes.
Screw the draft hood down using the included draft hood screws.
When installing vent piping, secure the vent pipe to the draft hood
using at least three sheet metal screws in the draft hood outlet.
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.
VENT CONNECTION
VENTING
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.
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.
Horizontal runs of vent pipe must have a minimum upward slope
toward the chimney of 1/4 inch per foot (2cm 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.
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.
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 (ANSIZ223.1) and with the Category I Venting Tables. In Canada, venting
shall conform to the requirements of the current CAN/CSA B149.100 installation code.
THERMOMETERS (Not Supplied)
Thermometers should be obtained and field installed.
If any part of the vent system are 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.
6
SINGLE TEMPERATURE
CIRCULATING RETURN LINE CONNECTIONS
TEMPERED WATER LOOP, IF USED, CONNECT TO POINT "A". STORED
TEMPERATURE WATER LOOP, IF USED, CONNECT TO COLD WATER INLET
WARNING
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE
TEMPERATURE AT FIXTURES. SEE TEMPERATURE REGULATION
ON PAGE 9. IF HIGHER PREHEAT TEMPERATURES ARE
NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD
AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.
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
RELIEF VALVE
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.
This water heater is equipped with a combination temperaturepressure relief valve that complies with the standard for relief valves
and automatic gas shutoff 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.
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.
ASME ratings cover pressure relief capacities. A.G.A. ratings cover
release rate with temperature actuation.
GAS PIPING
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).
Contact your local gas service company to ensure that adequate
gas service is available and to review applicable installation codes
for your area.
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.
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.
Your local code authority may have other specific relief valve
requirements.
WARNING
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER
THAN 14.0" W.C.(3.48 Kpa) - NATURAL GAS, (1/2 POUND PER
SQUARE INCH GAUGE- 3.45 Kpa) 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.
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.
7
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.
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.
DISCONNECT THE HEATER AND ITS MANUAL GAS SHUTOFF
VALVE FROM THE GAS SUPPLY PIPING SYSTEM DURING ANY
SUPPLY 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 SHUTOFF VALVE.
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
LENGTH
IN
FEET
10
20
30
40
50
60
70
80
90
100
125
150
175
200
LENGTH
IN
METERS
3.0
6.1
9.1
12.2
15.2
18.3
21.3
24.4
27.4
30.5
38.1
45.7
53.3
61.0
1/2"
175
120
97
82
73
66
61
57
53
50
44
40
37
35
1/2"
51
35
28
24
21
19
18
17
16
15
13
12
11
10
3/4"
360
250
200
170
151
138
125
118
110
103
93
84
77
72
NORMAL IRON PIPE SIZES (INCHES)
INPUT IN THOUSANDS BTU/HR
1" 1 1/4" 1 1/2" 2"
2 1/2"
3"
680 1400 2100 3960 6300 11000
485 950 1460 2750 4360 7700
375 770 1180 2200 3520 6250
320 660
990 1900 3000 5300
285 580
900 1680 2650 4750
260 530
810 1520 2400 4300
240 490
750 1400 2250 3900
220 460
690 1300 2050 3700
205 430
650 1220 1950 3450
195 400
620 1150 1850 3250
175 360
550 1020 1650 2950
160 325
500 950
1500 2650
145 300
460 850
1370 2450
135 280
430 800
1280 2280
4"
23000
15800
12800
10900
9700
8800
8100
7500
7200
6700
6000
5500
5000
4600
3/4"
105
73
59
50
44
40
37
35
32
30
27
25
23
21
NORMAL IRON PIPE SIZES (INCHES)
INPUT IN KW
1" 1 1/4" 1 1/2" 2"
2 1/2"
3"
199 410
615 1160 1845 3221
142 278
428 805
1277 2255
110 225
346 644
1031 1830
94
193
290 556
878
1552
83
170
264 492
776
1391
76
155
237 445
703
1259
70
143
220 410
659
1142
64
135
202 381
600
1083
60
126
190 357
571
1010
57
117
182 337
542
952
51
105
161 299
483
864
47
95
146 278
439
776
42
88
135 249
401
717
40
82
126 234
375
688
4"
6735
4626
3748
3192
2840
2577
2372
2196
2108
1962
1757
1610
1464
1347
FIGURE 4 - GAS PIPING AND DIRT LEG INSTALLATION
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.
FIGURE 5 -THERMOSTAT FOR NATURAL GAS
8
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 must not
be less than 4.5" w.c. (1.12 Kpa) for natural gas.
Do not subject the combination gas valve to inlet gas
pressures of more than 14.0" W.C. (3.48 Kpa) - natural 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.
TABLE 2
MANIFOLD PRESSURE SETTING
Model
Number
BT-65
Type of
Gas
Natural
Input
60,000 Btu/hr
17.6 KW/hr
Manifold
Pressure
4.0 in. W.C.
1.0 Kpa
OPERATION
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.
Entire system filled with water.
•
Air purged from all lines and no leaks (gas and water).
•
All gas and water lines open.
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.
Before lighting the pilot and operating the heater, the following
conditions must exist:
•
1.
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.
PRECAUTIONS
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDER
WATER. The heater must be replaced.
9
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING: If you do not follow these instructions exactly, a fire or explosion
may result causing property damage, personal injury or loss of life.
BEFORE OPERATING: ENTIRE SYSTEM MUST BE FILLED WITH WATER AND AIR PURGED FROM ALL LINES.
A. This appliance 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 supplier's
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.
LIGHTING INSTRUCTIONS
TOP KNOB
1.
STOP! Read safety information above
on this label.
2. Set the thermostat to lowest setting. Turn
thermostat dial fully clockwise
until it stops.
3. Push the gas control knob slightly and turn
to “OFF”. SEE FIGURE ‘A’.
clockwise
NOTE: Knob cannot be turned from “PILOT” to
“OFF” unless knob is pushed in slightly. Do not
force.
4. Wait five (5) minutes to
clear out any gas.
If you then smell gas,
STOP! Follow “B”
in the safety information
above on this
label. If you don't smell gas, go to next step.
5. Remove the outer door and open the hinged
inner door below and behind the gas control
unit.
6. Find the Pilot: Follow metal tube from gas
control. The pilot is between the burner tube
and the thermocouple, behind the burner access
doors. SEE FIGURE ‘D’.
7. Turn knob on gas control counter clockwise
to “PILOT”. SEE FIGURE ‘B’.
8. The pilot can be lighted with a match using
the lighter rod located beside the outer door.
FIGURE ‘D’
9. Push gas control knob down all the way and
hold it down. Immediately light the pilot with a
match. Continue to hold the control knob down
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 9. It may take several minutes for air
to clear the lines before the pilot will light.
• 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,
turn the gas control knob clockwise
to
“OFF” and call your service technician or gas
supplier. SEE FIGURE ‘A’.
10.Close the inner door and replace the outer door.
11.At arm’s length away, turn gas control knob
counter clockwise
to “ON”. SEE FIGURE
‘C’.
12. Set thermostat to desired setting.
CAUTION: Hotter water increases the
risk of scald injury. Consult the
instruction manual before changing
temperature.
TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to lowest setting.
2. Push in gas control knob slightly and turn
clockwise
to “OFF”. SEE FIGURE ‘A’.
Do not force.
10
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. 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
Canda 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
reduces temperature.
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.
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 20°F (11°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.
Time to Produce 2nd & 3rd
Temperature Setting
Degree Burns on Adult Skin
VERY HOT = APPROX.180°F (82°C) Nearly instantaneous
D = APPROX.160°F (71°C)
C = APPROX.150°F (65°C)
B = APPROX.140°F (60°C)
A = APPROX.130°F (54°C)
APPROX.120°F (49°C)
LOW = APPROX.100°F (37.8°C)
About 1/2 second
About 1-1/2 seconds
Less than 5 seconds
About 30 seconds
More than 5 minutes
--------
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
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
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.
11
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.
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.
WARNING
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.
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.
PILOT AND MAIN BURNER
FIGURE 7 - PILOT FLAME
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
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.
Model
BT-65
Type of
Gas
Natural
BTU Per
Cu. Ft.
1050
Time Required To
Consume 1 Cu. Ft.
of Gas
63.0 sec.
Use this formula to “clock” the meter. Be sure that other gas
consuming appliances are not operating during this interval.
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.
WARNING
SOOT BUILD-UP INDICATES A PROBLEM THAT REQUIRES
CORRECTION BEFORE FURTHER USE. CONSULT WITH A
QUALIFIED SERVICE TECHNICIAN.
12
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 = 63.0 seconds/ft3
ANODE ROD INSPECTION
H = 1,050 Btu/ft3 (natural gas)
Btuh = ?
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)
diameter core wire is visible as this means that the anode material
has been expended in the control of corrosion.
3,600 X 1,050 = 60,000 Btuh (17.6KW)
63.0
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 60,000
Btuh for natural gas.
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.
VENT SYSTEM
Examine the venting system every 6 months for obstructions and/
or deterioration of vent piping.
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.
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.
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.
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.
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 including the complete model and serial number as it
appears on the product. Refer to the parts list for more information.
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.
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.
WARNING
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO
SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO
THE APPLIANCE.
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 anodes with aluminum anodes
may correct the condition.
Occasionally water softener companies recommend removal of
heater anodes for odor reasons.
•
To relight the pilot, follow the instructions on the heater or
in this manual.
•
Check to see if the main gas shutoff 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.
CAUTION
Unauthorized removal of heater anode(s) 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.
13
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.
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.
1. The thermostat water temperature adjusting dial may be set
too high.
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.
2. If lowering control setting does not reduce the water
temperature contact your dealer.
4. If you cannot identify or correct the source of water leakage:
6. If you cannot determine the cause of the problems, contact
your dealer.
WATER TEMPERATURE IS TOO HOT
GAS SMELL AT THE HEATER
•
Close the main shutoff valve in the gas supply pipe at the
heater. See fig. 4, page 8.
1. Close the main shutoff 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.
•
Close the valve which feeds water to the cold water inlet at
the top of the heater.
•
Contact your dealer.
2. Call your gas company.
WATER LEAKAGE IS SUSPECTED
WATER HEATER MAKES SOUNDS
1. Check to see if the heater drain valve is tightly closed.
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. 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.
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.
14
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 used:
(1) at temperatures not exceeding the maximum setting of the thermostat;
(2) at water pressure not exceeding the working pressure shown on the heater;
(3) when filled with potable water free to circulate at all times;
(4) in a non-corrosive and non-contaminated atmosphere;
(5) with factory approved anode(s) installed;
(6) in its original installation location;
(7) in the United States, its territories or possessions, and Canada.
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.
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:
U.S. Customers
Canadian Customers
A. O. Smith Water Products Company
A. O. Smith Enterprises Ltd.
5621 West 115th Street
P. O. Box, 310 - 768 Erie Street
Alsip, IL 60803
Stratford, Ontario N5A 6T3
Telephone: 800-323-2636
Telephone: (519) 271-5800
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 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_____________
KEEP THIS WARRANTY POSTED ADJACENT TO THE HEATER FOR FUTURE REFERENCE.
15
REPLACEMENT PARTS
5621 W. 115TH STREET, ALSIP, IL 60803
Phone: 800-433-2545 Fax: 800-433-2515
www.hotwater.com E-Mail: [email protected]
16
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement