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MODELS BTN-80 AND 100
Series 110/111
COMMERCIAL LOW NOx GAS WATER HEATER
Glass-Lined Tank-type Water Heater
• INSTALLATION • OPERATION • SERVICE • MAINTENANCE • LIMITED WARRANTY
Low Lead Content
Thank you for buying this energy efficient water heater from A. O. Smith Corporation. We appreciate your confidence in our products.
PRINTED IN U.S.A.1012
CAUTION
TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION
RELATIVE TO YOUR SAFETY. PLEASE READ THOROUGHLY
BEFORE INSTALLING AND USING THIS APPLIANCE.
McBEE, SOUTH CAROLINA, USA
www.hotwater.com
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER
AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
1
PART NO. 197478-001
ROUGH-IN DIMENSIONS
TOP VIEW
*INSTALL IN ACCORDANCE WITH LOCAL CODES
TABLE 1, DIMENSIONS
MODEL
A in. (mm)
BTN-80
B in. (mm)
C in. (mm)
66 5/16 (1684) 58 1/2 (1486) 29 5/8 (753)
BTN-100 71 1/4 (1810)
D in. (mm)
23/8 (645)
FIGURE 1.
E F in. (mm) in. (mm)
15 (381) 4 (102)
G in. (mm)
14 (356)
H J in. (mm) in. (mm)
16 (406) 1 1/4 (32)
K in. (mm)
1 (25)
66 1/2 (1689) 30 3/4 (781) 26 1/2 (673) 15 (381) 4 (102) 14 1/2 (368) 16 (406) 1 1/4 (32) 1 1/4 (32)
L in. (mm)
M in. (mm)
1/2 (13) 11 15/16 (303)
1/2 (13) 11 15/16 (303)
TABLE 2, RECOVERY CAPACITIES (based on 80% thermal efficiency)
MODEL
BTN-80
BTN-100
INPUT
BTUH
80,000
76,000
90,000
80,000
KW
23.4
26.4
F°
C°
30° 36°
17° 20°
40°
23°
GPH 258 215 193
LPH 973 814 731
GPH 246 205 184
LPH 931 776 696
GPH 291 242 218
LPH 1104 915 825
GPH 258 215 193
LPH 973 814 731
Recovery capacity based on 80% thermal efficiency.
U.S. Gallons/Hr and Litres/Hr at TEMPERATURE RISE INDICATED
50°
28°
155
585
147
556
175
662
155
585
54°
30°
143
541
136
515
162
613
143
541
60°
33°
130
490
123
466
145
548
130
490
70°
39°
111
419
105
397
125
473
111
419
72°
40°
108
407
102
386
121
457
108
407
80°
44°
97
368
92
348
109
412
97
368
90° 100° 108° 110° 120° 126° 130° 140°
50°
86
86
56° 60°
77
77
71
71
61°
70
70
67°
65
65
70°
62
62
72°
60
324 293 269 264 245 233 225
82 74 68 67 61 58 57
310 280 257 254 231 220 216
97 87 81 79 73 69 67
367 329 306 299 276 261 253
60
324 293 269 264 245 233 225
78°
55
209
53
201
62
234
55
209
TABLE 3, GAS AND ELECTRICAL CHARACTERISTICS
MODEL
BTN (80, 100)
BTN (80, 100)
Type of Gas
Natural Gas
Propane Gas
Manifold Pressure
Inches W.C.
4.5
10.0
kPa
1.12
2.49
Electrical Characteristics
Voltz/Hz
120/60
120/60
All Models: Maximum supply pressure = 14.0 in. W.C. (3.48 kPa)
Minimum supply pressure, Natural gas = 6 in. W.C. (1.49 kPa). Propane gas = 11.0 in. W.C. (2.74 kPa).
Minimum pressures must be maintained under both load and no load (static and dynamic) conditions.
Amperes
<5
<5
FOREWORD
The design of models BTN-80 and 100 comply with the current edition of ANSI Z21.10.3/CSA 4.3 as automatic storage or automatic circulating tank type water heaters.
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 following:
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.
2
In the United States:
Current edition of the National Fuel Gas Code, ANSI Z223.1 / NFPA 54 and the National Electrical Code, NFPA 70;
In Canada:
Current edition of the Installation Code CAN/CSA-B149.1 and the
Canadian Electrical Code CSA C22.1.
These are available from Canadian Standards Association, 8501 East
Pleasant Valley Road, Cleveland, OH 44131 or National Fire Protection
Association, 1 Batterymarch Park, Quincy, MA 02269.
TABLE OF CONTENTS
Page
ROUGH-IN DIMENSIONS ............................................................. 2
FOREWORD ................................................................................. 2
GENERAL SAFETY INFORMATION
Precautions ................................................................................ 3
Grounding Instructions............................................................... 3
Chemical Vapor Corrosion ......................................................... 3
Liquid Petroleum Models ........................................................... 3
Extended Non-use Periods ........................................................ 3
Insulation Blankets..................................................................... 4
High Altitude Installations........................................................... 4
Circulating Pump ....................................................................... 4
INSTALLATION INSTRUCTIONS
Required Ability .......................................................................... 4
Locating The Heater .................................................................. 4-5
Clearances................................................................................. 5
Hard Water ................................................................................ 5
Air Requirements ....................................................................... 5
Venting ....................................................................................... 6
Thermometers (Not Supplied) ................................................... 6
Water Potable Heating and Space heating ................................ 6
Relief Valve ................................................................................ 6-7
Gas Piping ................................................................................. 7
Heater Wiring ............................................................................. 8
Wiring Diagram .......................................................................... 8
Purging ...................................................................................... 9
Gas Pressure Regulation.......................................................... 9
Page
OPERATION ................................................................................. 9
To Operate The Heater ............................................................. 9
Lighting Instructions .................................................................. 10
Temperature Regulation ........................................................... 11
Checking Venting ...................................................................... 11
High Temperature Cut-Off Switch ............................................. 11
SERVICE INFORMATION ............................................................ 12-13
Main Burner and Igniter ............................................................ 12
Checking Gas Input .................................................................. 12
Vent System.............................................................................. 12
Blower Maintenance ................................................................. 12
Relief Valve ............................................................................... 12-13
Hot Water Odor ......................................................................... 13
Winter Protection ...................................................................... 13
Replacement Parts ................................................................... 13
PREVENTIVE MAINTENANCE .................................................... 13-14
Procedure for Periodic Removal Of Lime Deposits .................. 13
Deliming Solvents ..................................................................... 13
Tank Cleanout Procedure ......................................................... 13-14
CHECKLIST ................................................................................. 14-15
Condensation............................................................................ 15
Cathodic Protection-Anode ....................................................... 15-16
Service & Repair ....................................................................... 16
TROUBLESHOOTING ................................................................. 16-18
LIMITED WARRANTY ................................................................... 19
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 SERVICE AGENT.
1. EXTERNAL FIRE.
2. DAMAGE.
3. FIRING WITHOUT WATER.
4. SOOTING.
Heater must be protected from freezing downdrafts during shutdown periods.
GROUNDING INSTRUCTIONS
This water heater must be grounded in accordance with the National
Electrical Code and/or local codes. These must be followed in all cases.
This water heater must be connected to a grounded metal, permanent wiring system; or an equipment grounding conductor must be run with the circuit conductors and connected to the equipment grounding terminal or lead on the water heater, see Figure 5.
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 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.)
LIQUID PETROLEUM MODELS
WARNING
Water heaters for propane or liquefied 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.
LP gas must be used with great caution. It is highly explosive and heavier than air. It collects first in the low areas making its odor difficult to detect as nose level. If LP gas is present or even suspected, do not attempt to find the cause yourself. Go to a neighbor's house, leaving your doors open to ventilate the house, then call your gas supplier or service agent.
Keep area clear until a service call has been made.
At times you may not be able to smell an LP gas leak. One cause is odor fade, which is a loss of the chemical odorant that gives LP gas its distinctive smell. Another cause can be your physical condition, such as having a cold or a diminishing sense of smell with age. For these reasons, the use of a propane gas detector is recommended.
IF YOU EXPERIENCE AN OUT-OF-GAS SITUATION, DO NOT TRY TO
RELIGHT APPLIANCES YOURSELF. Ask your LP delivery person to relight pilots for you. Only trained LP professionals should conduct the required safety checks in accordance with industry standards.
EXTENDED NON-USE PERIODS
WARNING
HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM
SERVED BY THIS HEATER THAT HAS NOT BEEN USED FOR A LONG
PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE). HYDROGEN
GAS IS EXTREMELY FLAMMABLE. To reduce the risk of injury under these conditions, it is recommended that the hot water faucet be opened for several minutes at the kitchen sink before using any electrical appliance connected to the hot water system. If hydrogen is present, there will probably be an unusual sound such as air escaping through the pipe as the water begins to flow. THERE SHOULD BE NO SMOKING OR OPEN
FLAME NEAR THE FAUCET AT THE TIME IT IS OPEN.
3
INSULATION BLANKETS
Insulation blankets available to the general public for external use on gas water heaters are not necessary 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 90.1-1999 standards with respect to insulation and standby loss requirement making an insulation blanket unnecessary.
CANADIAN REQUIREMENTS
Appliances with inputs up to and including 400,000 BTU (117.1kwh) 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.
WARNING
Should you choose to apply an insulation blanket to this heater, you should follow these instructions. Failure to follow these instructions can result in fire, asphyxiation , serious personal injury or death.
• Do not apply insulation to the top of the water heater, as this will interfere with safe operation.
• 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.
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. When ordering, be sure to state the model number and the altitude of the location where the water heater is being installed.
Upon completion of derating of the heater, adjustment to the gas pressure regulator may be required. See CHECKING THE INPUT section in this manual for inlet and manifold pressure requirements.
Also due to the input rating reduction required at high altitudes, the output rating of the appliance is also reduced and should be compensated for in the sizing of the equipment for application.
• Do inspect the insulation blanket frequently to make certain it does not sag, thereby obstructing combustion air flow.
CIRCULATING PUMP
A circulating pump is used when a system requires a circulating loop or there is a storage tank used in conjunction with the heater. Refer to the piping diagrams at rear of manual for electrical hookup information and install in accordance with the current edition of the National Electrical
Code ANSI/NFPA No. 70. In Canada refer to Canadian Electrical Code
CSA C22.1.
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/
NFPA 54. 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.
Only all bronze circulating pumps are used with commercial water heaters. Although circulators are oiled and operated by the manufacturer some circulating pumps must be oiled again before operating. Please refer to manufacturer’s instructions.
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, ELECTRICAL
AND GAS SUPPLY WORK ARE REQUIRED.
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.
U.S. REQUIREMENTS
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).
4
LOCATING THE HEATER
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.
SOME LOCAL CODES PERMIT OPERATION OF GAS APPLIANCES
IF INSTALLED 18 INCHES (45.7 CM) 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.
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.
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.
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.
THE HEATER MUST NOT BE LOCATED IN AN AREA WHERE IT WILL
BE SUBJECT TO FREEZING.
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.
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 Heater Parts Fulfillment, 125 Southeast Parkway,
Franklin, TN 37068. In Canada, A.O. Smith Enterprises, Ltd., P.O. Box
310-768 Erie Street, Stratford, Ontario N5A 6T3.
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.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILATING
AIR. ADEQUATE AIR FOR COMBUSTION AND VENTILATION MUST
BE PROVIDED FOR SAFE OPERATION.
For appliance installation locations with elevations above 2000 feet
(610 meters), refer to HIGH ALTITUDE INSTALLATIONS section of this manual for input reduction procedure.
UNCONFINED SPACE
In buildings of conventional frame, brick, or stone construction, unconfined spaces may provide adequate air for combustion, ventilation and draft hood dilution.
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 5" (10.2cm) to front to prevent a possible fire hazard condition. A minimum of 4" (10.2cm) shall be allowed for installation of serviceable parts.
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.
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.
See MAINTENANCE section for details of tank cleanout procedure.
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 (30.5cm)
OF THE ENCLOSURE TOP AND ONE IN OR WITHIN 12 INCHES
(30.5cm) OF THE ENCLOSURE BOTTOM. Each opening shall have a free area of at least one square inch per 1000 Btuh (2,225mm 2 /Kw) of the total input of all appliances in the enclosure, but not less than 100 square inches (645 square cm).
AIR REQUIREMENTS
REFER TO THE CURRENT EDITION OF THE "NATIONAL FUEL
GAS CODE ANSI Z223.1/NFPA 54. FOR CANADA CONSULT CAN/
CSA-B149.1.
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE
MATERIALS, GASOLINE AND OTHER FLAMMABLES, VAPORS AND
LIQUIDS.
DO NOT OBSTRUCT FLOW OF COMBUSTION OR VENTILATING AIR.
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
2 /Kw) of the total input of all appliances in the enclosure. If (8,900mm horizontal ducts are used, each opening shall have a free area of not less than one square inch per 2000 Btuh (4,450mm 2 /Kw) of the total input of all appliances in the enclosure. For Canadian installations consult
CAN/CSA-B149.1.
5
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 edition of the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and with the Category I Venting Tables.
In Canada, venting shall conform to the requirements of the current edition of the CAN/CSA B149.1-00 installation code.
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.
• 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.
FIGURE 2.
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 blower outlet.
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 blower.
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.
SINGLE TEMPERATURE
MIXING VALVE APPLICATION FOR TWO TEMPERATURE WATER
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.
VACUUM RELIEF
VALVE
*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
FIGURE 3.
6
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.
THERMOMETERS (Not Supplied)
OR HEATER DAMAGE. NO VALVE IS TO BE PLACED BETWEEN THE
RELIEF VALVE AND TANK.
Thermometers should be obtained and field installed as shown in Figure 3.
Your local code authority may have other specific relief valve requirements.
Thermometers are installed in the system as a means of detecting the temperature of the outlet water supply.
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.
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.
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.
The type, size and location of the relief valves must be in accordance with local codes. The location of the relief valve is shown in Figure 1.
The heater has a factory installed high temperature limit switch.
4. When the system requires water for space heating at temperatures higher than required for domestic water purposes, a tempering valve must be installed. Please refer to installation diagram on page 6 of this manual for suggested piping arrangements.
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.
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).
Size the main gas line in accordance with Table 4. 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 current edition of the National Fuel Gas Code. For Canadian installations consult Canadian Installation Code CAN/CSA-B149.1.
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.
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.
WARNING
The minimum gas supply pressure for input adjustment is 6.0" (15.2 cm)
W.C. (1.49 kPa) for natural gas (11.0" W.C. [ 2.74 kPa ] for propane).
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER THAN
14" WATER COLUMN (3.5 kPa) SUPPLY PRESSURE. EXPOSURE
TO HIGHER GAS SUPPLY PRESSURE MAY CAUSE DAMAGE TO
THE CONTROL WHICH COULD RESULT IN FIRE OF EXPLOSION. If overpressure has occurred such as through improper testing of gas lines or emergency malfunction of the supply system, the control must be checked for safe operation. 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.
RELIEF VALVE
This water heater is equipped with a combination temperature-pressure relief valve that complies with the standard for relief valves for hot water supply systems Z21.22-CSA 4.4. FOR SAFE OPERATION OF THE
WATER HEATER, THE RELIEF VALVE(S) MUST NOT BE REMOVED
OR PLUGGED.
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.
ASME ratings cover pressure relief capacities. ANSI ratings cover release rate with temperature actuation.
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). This valve shall comply with the standard for relief valves for hot water supply systems Z21.22-CSA 4.4.
TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS SUPPLY LINE,
A SEDIMENT TRAP MUST BE INCORPORATED IN THE PIPING (SEE
FIG. 5). THE SEDIMENT TRAP MUST BE READILY ACCESSIBLE AND
NOT SUBJECT TO FREEZING CONDITIONS. INSTALL IN ACCORDANCE
WITH RECOMMENDATIONS OF SERVING GAS SUPPLIERS. REFER
TO THE CURRENT EDITION OF THE NATIONAL FUEL GAS CODE.
For Canadian installations consult Canadian Installation Code CAN/
CSA-B149.1.
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
7
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.
HEATER WIRING
All electrical work must be installed in the United States in accordance with the current edition of the National Electrical Code ANSI/NFPA No.
70, in Canada, with the current edition of Canadian Electrical Code CSA C22.1, must conform to all local code authority having jurisdiction. AN
ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF ELECTRICAL SHOCK OR POSSIBLE ELECTROCUTION.
If any of the original wire as supplied with the appliance must be replaced, use only type 105°C thermoplastic or equivalent, 250°C type F must be used for the flame sensor leads and the spark ignition cable must be high voltage 250°C.
CAUTION
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND
DANGEROUS OPERATION. VERIFY PROPER OPERATION AFTER SERVICING.
FIGURE 4. WIRING DIAGRAM AND SCHEMATIC
8
TABLE 4. GAS SUPPLY LINE SIZES (IN INCHES)*
MAXIMUM CAPACITY OF PIPE IN
CUBIC FEET PER HOUR
LENGTH
IN
NORMAL IRON PIPE SIZES (INCHES)
INPUT IN THOUSANDS BTU/HR
FEET 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3"
10
20
30
40
50
60
70
80
90
100
125
150
175
200
4"
175 360 680 1400 2100 3960 6300 11000 23000
120 250 485 950 1460 2750 4360 7700 15800
97 200 375 770 1180 2200 3520 6250 12800
82 170 320 660 990 1900 3000 5300 10900
73 151 285 580 900 1680 2650 4750 9700
66 138 260 530 810 1520 2400 4300 8800
61 125 240 490 750 1400 2250 3900 8100
57 118 220 460 690 1300 2050 3700 7500
53 110 205 430 650 1220 1950 3450 7200
50 103 195 400 620 1150 1850 3250 6700
44 93 175 360 550 1020 1650 2950 6000
40 84 160 325 500 950 1500 2650 5500
37 77 145 300 460 850 1370 2450 5000
35 72 135 280 430 800 1280 2280 4600
LENGTH
IN
6.1
9.1
35
NORMAL IRON PIPE SIZES (INCHES)
INPUT IN KW
METERS 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3"
3.0
73 142 278 428
4"
51 105 199 410 615 1160 1845 3221 6735
28 59 110 225 346
805 1277 2255 4626
644 1031 1830 3748
12.2 24 50 94 193 290 556 878 1552 3192
15.2 21 44 83 170 264 492 776 1391 2840
18.3 19 40 76 155 237 445 703 1259 2577
21.3 18 37 70 143 220 410 659 1142 2372
24.4 17 35 64 135 202 381 600 1083 2196
27.4 16 32 60 126 190 357 571 1010 2108
30.5 15 30 57 117 182 337 542 952 1962
38.1 13 27 51 105 161 299 483 864 1757
45.7 12 25 47 95 146 278 439 776 1610
53.3 11 23 42 88 135 249 401 717 1464
61.0 10 21 40 82 126 234 375 688 1347
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.
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 GASES 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.
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 6" w.c. (1.49 kPa) for natural gas and 11" w.c. (2.73 kPa).
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 5, refer to flow pressure taken at pressure tap of automatic gas valve while heater is operating.
TABLE 5. MANIFOLD PRESSURE SETTING
Model
Number
BTN-80
BTN-80
BTN-100
BTN-100
Type of
Gas
Natural
Propane
Natural
Propane
Input
80,000 Btu/hr
23.4 KW/hr
76,000 Btu/hr
22.2 KW/hr
90,000 Btu/hr
26.4 KW/hr
80,000 Btu/hr
23.4 KW/hr
Manifold
Pressure
4.5 in. W.C.
1.12 kPa
10.0 in. W.C.
2.48 kPa
4.5 in. W.C.
1.12 kPa
10.0 in. W.C.
2.48 kPa
OPERATION
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.
TO OPERATE THE HEATER
1. Close the heater drain valve (Figure 1) by turning handle clockwise
.
2. Open a nearby hot water faucet to permit the air in the system to escape.
FIGURE 5. GAS PIPING AND SEDIMENT TRAP INSTALLATION
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.
PURGING
Gas line purging is required with new piping or systems in which air has entered.
9
3. Fully open the cold water inlet pipe valve (Figure 1) allowing the heater and piping to be filled.
4. Close the hot water faucet as water starts to flow.
5. The heater is ready to be operated.
WARNING
DO NOT ATTEMPT TO OPERATE WATER HEATER WITH COLD
WATER INLET VALVE CLOSED.
NEVER OPERATE THE HEATER WITHOUT FIRST BEING CERTAIN IT IS
FILLED WITH WATER AND A TEMPERATURE AND PRESSURE RELIEF
VALVE IS INSTALLED IN THE RELIEF VALVE OPENING OF THE HEATER.
FOR YOUR SAFETY READ BEFORE OPERATING
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 does not have a pilot. It is equipped with an ignition device which automatically lights the burner.
Do not try to light the burner by hand.
B. BEFORE OPERATING 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.
• If you cannot reach your gas supplier, call the fire department.
C. Use only your hand to push in the control buttons. Never use tools. If the control buttons will not push in, don’t try to repair them, call a qualified service technician. Force or attempted repair may result in a fire or explosion.
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.
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.
OPERATING INSTRUCTIONS
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. Turn on all electrical power to the appliance.
7. Set thermostat to desired setting by first pressing the
COOLER and HOTTER buttons together and holding for 1 second. Then press the HOTTER button.
1. STOP! Read the safety information above on this label.
2. Set the thermostat to the lowest setting by first pressing the COOLER and HOTTER buttons together and holding for 1 second. Then press the COOLER
button until the WARM indicator light appears.
8. If the appliance will not operate, follow the instructions "TO TURN OFF GAS TO APPLIANCE" and call your technician or gas supplier.
9. WATER TEMPERATURE ADJUSTMENT is approximately 120°F (49°C).
3. Turn the "ON/OFF" swich on the blower control to the
"OFF" position.
4. This appliance is equipped with a device which automatically lights the burner.
DO NOT TRY TO LIGHT THE BURNER BY HAND.
CAUTION: Hotter water increases the risk of scald injury. Consult the instruction manual before changing temperatures.
WARNING: TURN OFF ALL ELECTRIC
POWER BEFORE SERVICING
TO TURN OFF GAS TO APPLIANCE
A. Set thermostat to the lowest setting.
B. Turn off all the electric power to the appliance if service is to be performed.
10
TEMPERATURE REGULATION
SETTING THE WATER HEATER TEMPERATURE AT 120°F (49°C)
(APPROX. " " MARK ON FACE OF THE TEMPERATURE ADJUSTING
DIAL) WILL REDUCE THE RISK OF SCALDS.
Some States or Provinces require settings at specific lower temperatures.
Figure 6 shows the approximate water temperatures produced at various thermostat 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.
DANGER
THIS WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE
THERMOSTAT TO CONTROL WATER TEMPERATURE. HOT WATER
TEMPERATURES REQUIRED FOR AUTOMATIC DISHWASHING 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.
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.
To avoid any unintentional changes in water temperature settings, the control has a tamper resistant feature for changing the temperature setting. To change the temperature setting follow these instructions:
1. "Wake Up" the temperature indicators by holding down both the
"COOLER" and "HOTTER" temperature adjustment buttons at the same time for one second (see Figure 6). One or two of the temperature indicators will light up. These indicators will only remain on for 30 seconds if no further buttons are pressed. After 30 seconds the control will go back to "Sleep" mode.
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 Parts Fulfillment, 125 Southeast
Parkway, Franklin, TN 37068. In Canada, A.O. Smith Enterprises, LTD.,
P.O. Box 310- 768 Erie Street, Stratford, Ontario 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 setting be set for the lowest temperature that satisfies your hot water needs. This will also provide the most energy efficient operation of the water heater. The water temperature adjustment was factory set at the lowest temperature. Pressing the "COOLER" button decreases temperature and pressing the "HOTTER" button increases the temperature.
2. Release both of the temperature adjustment buttons.
A. To decrease the temperature press and release the "COOLER" button until desired setting is reached.
B. To increase the temperature press and release the "HOTTER" button until the desired setting is reached.
NOTE: Holding down the button will not continue to lower or raise the temperature setting. The button must be pressed and released for each temperature change desired.
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO
SHUT OFF, TURN OFF THE MAIN MANUAL GAS SHUTOFF VALVE
TO THE APPLIANCE. SEE FIGURE 1 (G).
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.
Temperature Setting
F = approx. 180°F (82°C)
E = approx. 170°F (77°C)
D = approx. 160°F (71°C)
C = approx. 150°F (65°C)
B = approx. 140°F (60°C)
B = approx. 130°F (54°C)
= approx. 120°F (49°C)
Display
Time to Produce
2nd & 3rd Degree
B C D E F Burns on Adult Skin
Nearly Instantaneous
Nearly Instantaneous
About 1/2 Second
About 1 1/2 Seconds
Less than 5 Seconds
More than 30 Seconds
More than 5 Minutes
FIGURE 6.
2. Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, ANSI Z223.1/NFPA 54 or the CAN/CSA-B149.1 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.
4. Follow the lighting instruction. Place the water heater being inspected in operation. Adjust thermostat so appliance shall operate continuously.
11
5. Test for vent system leakage 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.
FIGURE 7A. MAIN BURNER AND IGNITER ASSEMBLY - PROPANE GAS
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.
HIGH TEMPERATURE LIMIT SWITCH (ECO)
The water heater is equipped with a manual reset type high limit (Energy
Cutoff) sensor. The high limit switch interrupts the main burner gas flow should the water temperature reach 195°F (90°C). The high limit switch must be manually reset by turning the power to the water heater off for 5 seconds then back on and cannot be reset until the water temperature drops below 120°F (49°C). It is important that a serviceman be called to determine the reason for limit operation and thus avoid repeated thermostat resetting.
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.
WARNING
THE ON/OFF SWITCH 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.
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO
SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO
THE APPLIANCE.
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.
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.
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.
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 6.
FOR YOUR SAFETY AND SATISFACTORY OPERATION, IT IS
RECOMMENDED THAT THIS HEATER BE CHECKED ONCE A YEAR
BY A COMPETENT SERVICE PERSON.
TABLE 6
INPUT CHECK TIME REQUIRED TO CONSUME 1 CU. FT. OF GAS
Model
BTN-80
BTN-100
Type of BTU Per Time Required To Consume
Gas
Natural
Natural
Cu. Ft.
1050
1050
1 Cu. Ft. of Gas
47.2 sec.
42.0 sec.
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.
MAIN BURNER AND IGNITER
Check main burner (figure 7) at least every 6 months for proper flame characteristics. The main burner should display the following characteristics:
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 BTN-80 heater)
T = 47.2 seconds/ft 3
(natural gas) H = 1,050 Btu/ft 3
Btuh = ?
3,600 X 1,050 = 80,000 Btuh (23.4Kwh)
47.2
Compare the actual input rate to that given on the heater’s rating plate.
In the example, the BTN-80’s full input rate should be 80,000 Btuh (23.4
Kwh) for natural gas.
FIGURE 7. MAIN BURNER AND IGNITER ASSEMBLY - NATURAL GAS
12
VENT SYSTEM
Examine the venting system every 6 months for obstructions and/or deterioration of vent piping.
BLOWER MAINTENANCE
For safety and satisfactory operation it is recommended that the blower be checked once a year by a competent service person.
1. MOTOR - The motor is factory oiled and sealed and requires no further maintenance.
2. WHEEL - Wheel must be clean of soot, ash or any other coating which inhibits either rotation or air flow. Remove all foreign material from vent system.
3. The pressure switch is inside the blower control box and is connected to the blower housing with a tube. This tubing should be soft and pliable and show no sign of deterioration.
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.
PREVENTIVE MAINTENANCE
RECOMMENDED PROCEDURE FOR PERIODIC
REMOVAL OF LIME DEPOSITS FROM TANK TYPE
COMMERCIAL WATER HEATERS
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. DO
NOT PLUG THE TEMPERATURE AND PRESSURE RELIEF VALVE.
FIGURE 8.
WARNING
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT
OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO THE APPLIANCE.
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 aluminum anode may correct the condition.
The amount of calcium carbonate (lime) released from water is in direct proportion to water temperature and usage, see chart. The higher the water temperature or water usage, the more lime deposits are dropped out of the water. This is the lime scale which forms in pipes, heaters and on cooking utensils.
Lime accumulation not only reduces the life of the equipment but also reduces efficiency of the heater and increases fuel consumption.
The usage of water softening equipment greatly reduces the hardness of the water. However, this equipment does not always remove all of the hardness (lime). For this reason it is recommended that a regular schedule for deliming be maintained.
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.
The time between cleaning will vary from weeks to months depending upon water conditions and usage.
Refer to A. O. Smith booklet, Form No. 4800, entitled “Why? When and
How” for detailed description on tank inspection and cleanout.
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.
UN•LIME ® and the booklet may be obtained through your A. O. Smith dealer or distributor.
DELIMING SOLVENTS
REPLACEMENT PARTS
A. O. Smith recommends the use of UN•LIME for deliming. UN•LIME is a patented food grade acid which is safe to handle and does not create the harmful fumes which are associated with other products.
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 Heater Parts Fulfillment, 125
Southeast Parkway, Franklin, TN 37068, 1-800-433-2545. In Canada contact A.O. Smith Enterprises Ltd., P.O. Box, 310-768 Erie Street,
Stratford, Ontario N5A 6T3, 1-800-265-8520. 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.
13
UN•LIME may be obtained from your dealer, distributor or the A. O. Smith
Product Service Division. Order part no. per case or part no. un-lime® professional delimer part number description 9005416105 4 - 1 gallon
(case) 9005417105 1 - 5 gallon.
Hydrochloric base acids are not recommended for use on glass-lined tanks.
CAUTION
Observe handling instructions on label of product being used.
TANK CLEANOUT PROCEDURE
The following practices will ensure longer life and enable the unit to operate at its designed efficiency:
Figure 9 illustrates most of the following steps.
1. Once a month the heater should be flushed. Open the drain valve and allow two gallons of water to drain from the heater. Inlet water valve should remain open to maintain pressure in tank.
2. A cleanout opening is provided for periodic cleaning of the tank.
Gas must be shut off and heater drained before opening cleanout.
2. With the Flo-Jug upright:
• Take off cap, remove cover under opening and install 3/4" x 4" pipe nipple.
To clean heater through cleanout opening, proceed as follows:
1. Drain heater.
2. Remove outer cover plate from lower side of heater jacket.
3. Remove six (6) hex head screws securing tank cleanout plate and remove plate.
4. Remove lime, scale, or sediment using care not to damage the glass lining.
5. Inspect cleanout plate gasket, if new gasket is required, replace.
1. The heater should be prepared for deliming as described in the
“Why? When and How” booklet. The relief valve may also be delimed at this time.
• Drill or punch a 3/16" vent hole in handle. A stainless steel screw is included with the Flo-Jug kit. This screw is to be installed in the vent hole when Flo-Jug is not in use.
• Remove drain valve from heater and insert a 3/4" x 4" nipple.
• Connect and clamp 1" I.D. x 3" hose to Flo-Jug and heater nipple.
3. Lift the Flo-Jug to the POUR POSITION and permit the UN•LIME to flow into the heater as rapidly as possible.
• Be sure to keep the vent just above the liquid level.
4. Place the Flo-Jug in the DELIME POSITION.
6. Install cleanout plate. Be sure to draw plate up tight by tightening screws securely.
7. Replace outer jacket cover plate.
• It may be necessary to place the empty jug on its carton to trap the solution in the heater.
• Allow the UN•LIME to attack the water scale for 5 minutes.
In some water areas the sediment might not be removed by this method and may result in the water heater making rumbling or boiling noises.
To dissolve and remove these more stubborn mineral deposits, A. O.
Smith UN•LIME Professional Delimer should be used.
5. Lower the Flo-Jug to the DRAIN POSITION and allow the UN•LIME to flow out of the heater as rapidly as possible.
• Observe the vent holes and elevate the jug slightly if there is a possibility of spillage.
FIGURE 9
• Deliming activity is indicated by foaming on the surface of the solution.
6. Continue the deliming process:
• Raise jug to POUR POSITION. Allow solution to flow into heater.
• Place jug in DELIME POSITION for 5 minutes. Solution is at work in heater.
• Lower jug to DRAIN POSITION and allow solution to flow out.
Observe foaming.
7. After one hour, or earlier if the deliming activity (foaming) stops, inspect the tank interior.
• Drain the UN•LIME back into jug, DRAIN POSITION, and then stand jug in DELIME POSITION.
• Remove clamp, hose and pipe nipple from heater drain opening.
• Observe interior through opening - a small flashlight may be used effectively.
• If the interior still shows water scale, the deliming process should be continued.
FLO-JUG METHOD OF DELIMING
The Flo-Jug is the standard 5 gallon container for UN•LIME -or- it is available as a deliming kit with hose and fittings. Contact your dealer, distributor or the A. O. Smith Corporation.
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• To check UN•LIME for continued use or reuse, place some lime scale or white chalk into a glass with a small amount of solution. If the material is vigorously dissolved by the solution, the UN•LIME can be reused. If not, the UN•LIME has been weakened and should be replaced.
8. When deliming has been completed, the heater should be flushed for 3 to 5 minutes with fresh water.
9. When flushing is completed:
• Fill heater being certain to expel air from tank through a nearby hot water faucet or, if removed, the relief valve opening.
• The heater relief valve can be washed in UN•LIME if it is limed.
• Restore gas, oil or electrical supply to heater.
• Check for water leakage.
CHECKLIST
2. The apparent leakage might be condensation. In warm or humid locations, condensation can accumulate and run from within the heater or its piping.
• Remove the deliming equipment, install the drain valve, open the cold water inlet line and allow water to flow through heater and out drain valve. Don’t forget to plug vent and cap opening in Flo-Jug.
• Replace relief valve if removed for deliming.
• When a water heater is first installed and filled, the bottom of the tank might condense water. The water accumulation, if excessive, can drip into the floor shield. Also, during normal operation there may be occasions when large quantities of water are drawn, chilling the tank bottom. This too can result in condensation.
• Condensation, appearing in the vent pipe (water dripping from draft diverter) during heater operation is evidence of poor vent action. Possible causes are too long a vent pipe or improper chimney operation.
3. If the leakage is from the temperature and pressure relief valve or its discharge pipe, it may represent a normal condition. However, see RELIEF VALVE section on page 7. 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.
10. Flo-Jug cleanup:
• Allow scale to separate from UN•LIME and settle on bottom of
Flo-Jug.
• Pour off UN•LIME into plastic container and check for reuse.
• Rinse sediment from Flo-Jug.
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.
4. If you cannot identify or correct the source of water leakage:
• Close the main shutoff valve in the gas supply pipe at the heater. See Figure 5, page 9.
• Close the valve which feeds water to the cold water inlet at the top of the heater.
• Contact your dealer.
WATER HEATER MAKES SOUNDS
1. Occasional excessive condensation, as explained under LEAKAGE, can cause a sizzling sound as the moisture is vaporized by the gas flame. This is a normal sound and may be disregarded.
NOT ENOUGH OR NO HOT WATER
1. Look for leaking or open hot water faucets. Check for excessive usage.
2. 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.
2. Sediment and water scale accumulations may cause rumbling noises. See MAINTENANCE or contact your dealer for details of flushing the heater.
3. If you cannot identify or remedy the condition, contact your dealer.
3. If the heater was installed when incoming water temperatures were warm, colder incoming temperatures will create the effect of less hot water.
4. The thermostat water temperature adjusting dial may be set too low.
CONDENSATION
Water vapor can condense on the cooler surfaces of the tank forming droplets, these drip into the fire or run out on the floor. This is common at the time of startup after installation, during periods of time when incoming water is very cold, or the heater may be undersized for the requirements.
5. If you cannot determine the cause of the problems, contact your dealer.
WATER TEMPERATURE IS TOO HOT
1. The thermostat water temperature adjusting dial may be set too high.
Droplets from the bottom of the flue may be due to corrosive combustion products or improper vent. Check with your dealer for more information.
CATHODIC PROTECTION-ANODE
2. If lowering control setting does not reduce the water temperature contact your dealer.
GAS SMELL AT THE HEATER
1. Close the main shutoff valve in the gas supply pipe near the heater, see Figure 5 on page 9. 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.
The anode rod is used to protect the tank from corrosion. Most hot water tanks are equipped with an anode rod. The submerged rod sacrifices itself to protect the tank. Instead of corroding the tank, water ions attack and eat away the anode rod. This does not affect the water’s taste or color. The rod must be maintained to keep the tank in operating condition.
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Anode deterioration depends on water conductivity, not necessarily water condition. A corroded or pitted anode rod indicates high water conductivity and should be checked and/or replaced more often than an anode rod that appears to be intact. Replacement of a depleted anode rod can extend the life of your water heater. Inspection should be conducted by a qualified technician, and at a minimum should be checked annually after the warranty period.
A hydrogen sulfide (rotten egg) odor may result if water contains high sulfate and/or minerals. Chlorinating the water supply should minimize the problem. (See EXTENDED NON-USE PERIODS).
NOTE: Anode must remain installed (except for inspection) to avoid shortening tank life. See LIMITED WARRANTY. Replace as necessary.
TROUBLESHOOTING
Water heaters may exhibit problems that are unrelated to a malfunction of the water heater itself. The following information and tables may serve to answer your question about a problem that you are having without having to call a service agent.
SERVICE AND REPAIR
The A.O. Smith water heater requires no special care other than the normal maintenance as noted above. If you are having a problem with your water heater, before calling for service please refer to the following
TROUBLESHOOTING sections. If service becomes necessary, contact your dealer, installer or an authorized service agent. Do not attempt to repair the water heater yourself. Any work performed by unauthorized personnel may void the warranty.
For your safety, water heater service should be performed only by a qualified service technician. Read the GENERAL SAFETY
INFORMATION section first.
WATER HEATING CYCLE
(GAS AND ELECTRIC POWER ARE ON,“OFF/ON” SWITCH IS ON)
1) CALLS FOR HEAT
If you are having a problem with your A.O. Smith water heater and are not pleased with the service you received:
A) THERMOSTAT SENSES NEED FOR HEATING WATER
B) CONTACTS CLOSE IN THERMOSTAT, POWER (115 VAC)
FLOWS TO BLOWER MOTOR
2) BLOWER MOTOR ROTATES BLOWER WHEEL
• First, please contact your dealer or the A.O. Smith authorized service agent in your area and explain to them why you are not satisfied.
This will usually correct the problem.
• If after working with your dealer or service agent the problem has not been resolved to your satisfaction, please let us know by either writing to us at:
U.S. Customers
A.O. Smith
Service Department
500 Tennessee Waltz Parkway
Ashland City, TN 37015
Canadian Customers
A.O. Smith Enterprises Ltd.
P.O. Box 310
768 Erie Street
Stratford, Ontario N5A 6T3 or, going to our website at: www.hotwater.com
Please click on: "Mail", then click on: "Service" and leave us a message.
Please be sure to provide the following information when writing or e-mailing:
• Model Number
• Serial Number
• Date of Original Purchase
• Date Problem Originated
• Explanation of Problem
Also, please be sure to include a daytime telephone number.
A) BLOWER WHEEL SPEED INCREASES
B) WHEEL SPEED INCREASES, AIR PRESSURE SWITCH
CONTACTS CLOSE
3) 120 VAC FLOWS TO HOT SURFACE IGNITER
NOTE: THE CONTROL MODULE ON THIS UNIT WILL TRY A
MAXIMUM OF THREE TIMES TO LIGHT THE UNIT. CYCLE CAN BE
RESTARTED AT ANY TIME BY TURNING OFF SWITCH AND THEN
TURNING BACK ON. IF UNIT HAS GONE THROUGH THREE CYCLES
AND DID NOT LIGHT, THEN REPAIRMAN SHOULD BE CALLED TO
CHECK OPERATION OF HEATER.
4) MAIN BURNER IGNITES
A) GAS FLOWS TO MAIN BURNER PORTS AND IS IGNITED
5) GAS VALVE SENSES BURNER FLAME
6) BURNER HEATS WATER
A) BURNER HEATS WATER TO THERMOSTAT SETTING
B) CONTACTS IN THERMOSTAT OPEN,
C) CYCLE IS COMPLETED
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WARNING: DO NOT BY-PASS ANY CONTROLS TO MAKE HEATER OPERATE. OPERATE ONLY AS WIRED FROM FACTORY.
TROUBLESHOOTING
For your safety, water heater service should be performed only by a qualified service technician.
Read the GENERAL SAFETY INFORMATION section first.
PROBLEM
NOT ENOUGH OR
NO HOT WATER
POSSIBLE MALFUNCTION
1) Blower will not run
A) “ON/OFF” control switch turned off
B) Blower unplugged
C) No power at outlet
D) “ON/OFF” switch defective
E) Control harness defective
F) Blower motor defective
2) Blower running, burner not on
A) Fan not running fast enough to close
air switch contacts
B) Air pressure switch defective
C) Gas valve defective
D) Control harness defective
E) Igniter defective
F) Unit has completed three trials to light
and failed
YELLOW FLAME
3) Thermostat problems
A) Thermostat set too low
B) Thermostat or ECO defective
C) High limit control circuit open
4) Others
A) Heater undersized
B) Low gas pressure
C) Incoming water is unusually cold
D) Leaking hot water pipes or fixtures
A) Dirt in burner ports
B) Combustion air path restricted
C) Not enough room air for proper
combustion
CONDENSATION
WATER LEAKS
LEAKING T&P VALVE
HOT WATER ODORS
OR COLOR
(Refer to CATHODIC
PROTECTION)
A) Water on the floor under heater
Improperly sealed, hot or cold supply connections, relief valve, drain valve or thermostat threads.
Leakage from other appliances or water lines
Condensation of flue products
Thermal expansion in closed water system
Improperly seated valve
High sulfate or mineral content in water supply or iron or sulfate reducing bacteria in water supply
SERVICE TO BE PERFORMED
Turn switch to the “ON” position.
Plug blower back into 115 vac. outlet.
Repair service to outlet.
Replace switch.
Replace control harness.
Replace blower and motor.
Replace switch.
Check for low voltage, less than 102 vac., have service checked and repaired.
Replace switch.
Replace gas valve.
Replace harness.
Replace igniter.
Reset cycle by turning switch off and then back on. If unit does not light in three trials, call an authorized A.O. Smith service representative.
Set temperature control higher.
Replace thermostat.
Replace.
Reduce hot water use.
Contact an authorized A.O.Smith service representative.
Allow more time for heater to re-heat.
Have plumber check and repair leaks.
Turn off heater and gas, clean burner head.
Clear area around heater and check under heater, remove any debris under heater and in openings in bottom cover.
Refer to installation manual - Confined and Unconfined
Space statements on page 5 for required openings.
See “CONDENSATION.”
Turn off heater & water, repair unit.
Inspect other appliances near water heater.
Refer to “CONDENSATION.”
Install thermal expansion tank (DO NOT plug T&P valve).
Check relief valve for proper operation (DO NOT plug T&P valve).
Drain and flush heater thoroughly, chlorinate, refill and flush again then chlorinate water supply.
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WARNING: DO NOT BY-PASS ANY CONTROLS TO MAKE HEATER OPERATE.
OPERATE ONLY AS WIRED FROM FACTORY.
TROUBLESHOOTING
Please check guidelines below. For your safety, water heater service should be performed only by a qualified service technician.
Read the GENERAL SAFETY INFORMATION section first.
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LED STATUS PROBLEM
An open earth ground circuit to the
B C D E F
ignition system.
B C D E F
Wiring error or a high resistance to earth ground.
B C D E F
B C D E F
SOLUTION
1. Check that the earth ground connection is
properly connected.
2. Check that the ground conductor on the
water heater is properly connected.
1. Check for proper connection of line
neutral and hot wires.
2. Check that the water heater is securely
connected to earth ground.
Pressure switch remained closed longer 1. Pressure switch wiring is incorrect.
than 5 seconds after the call for heat began.
Pressure switch remained open longer than 5 seconds after the combustion blower was energized.
2. Replace pressure switch.
1. Pressure switch wiring is incorrect.
2. Pressure switch tubing not connected
correctly.
3. Air intake or exhaust obstructed.
B C D E F
B C D E F
B C D E F
B C D E F
B C D E F
B C D E F
B C D E F
B C D E F
Error in the hot surface ignitor circuit.
System in lockout.
Problem in the gas valve driver circuit. 1. Turn power to the water heater off for
10 seconds and then back on.
2. Replace gas control valve.
Problem with the internal circuit. 1. Turn power to the water heater off for
10 seconds and then back on.
2. Replace gas control valve.
Problem with the internal circuit.
Flame signal sensed out of proper sequence.
ECO activated.
One of the temperature adjust buttons stuck closed.
B C D E F
Water temperature sensor is either open or short circuited.
1. Check that all wiring is correct and secure.
2. Replace hot surface ignitor.
1. Gas supply is off or too low to operate.
2. Hot surface ignitor not positioned
correctly.
3. Low voltage to the water heater.
4. Electric polarity to unit is incorrect - test
and correct.
1. Turn power to the water heater off for
10 seconds and then back on.
2. Replace gas control valve.
1. Replace gas control valve.
1. Lower water temperature to below 120°F
and turn power to the water heater off for
10 seconds and then back on.
2. Replace gas control valve.
1. Press and release each of the buttons once.
2. Replace gas control valve.
1. Check that all wiring is correct and secure.
2. Replace gas control valve.
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Model BTN 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 and 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) 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) used in an open system or in a closed system with properly sized and installed thermal expansion tank;
(11) operated with properly installed dirt leg;
(12) fired with the fuel for which it was factory built;
(13) fired at the factory rated input;
(14) operated with the inner and outer combustion chamber doors in place.
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 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
A. O. Smith
500 Tennessee Waltz Parkway
Canadian Customers
A. O. Smith Enterprises Ltd.
P. O. Box, 310 - 768 Erie Street
Stratford, Ontario N5A 6T3 Ashland City, TN 37015
Telephone: (800) 323-2636 Telephone: (800) 265-8520 a. The warrantor will only honor replacement with identical or similar water heater or parts thereof which are manufactured or distributed by the warrantor.
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 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.
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500 Tennessee Waltz Parkway, Ashland City, TN 37015
PHONE: 1-800-433-2545 FAX: 1-800-433-2515
www.hotwater.com email: [email protected]
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