A.O. Smith | BTI-80 | Instruction manual | A.O. Smith BTI-80 Instruction manual

A.O. Smith BTI-80 Instruction manual
MODELS BTI-80 AND 100
Series 110
Natural Gas Only
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. 0803
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER
AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
1
PART NO.195086-000
ROUGH-IN DIMENSIONS
TOP VIEW
*INSTALL IN ACCORDANCE WITH LOCAL CODES
FIGURE 1
TABLE 1, DIMENSIONS
A
B
MODEL
In.
mm
In. mm
C
In.
D
mm
In.
E
mm
In.
BTI-80 66 5/16 1684 58 1/2 1486 29 5/8 753 25 3/8 645 17 1/4
BTI-100 71 1/4 1810 66 1/2 1689 30 3/4 781 26 1/2 673 17 1/4
F
mm In. mm
438
438
G
H
In. mm In. mm
J
In. mm
4 102 14
356 16 406 1 1/4 32
4 102 14 1/2 368 16 406 1 1/4 32
TABLE 2, RECOVERY CAPACITIES (based on 80% thermal efficiency)
U.S. Gallons/Hr and Litres/Hr at TEMPERATURE RISE INDICATED
INPUT
F°
30F° 36F° 40F° 50F° 54F° 60F° 70°F° 72F° 80F° 90F° 100F° 108F°
MODEL BTUH KW C° 17C° 20C° 23C° 28C° 30C° 33C° 39C° 40C° 44C° 50C° 56C° 60C°
BTI-80 76,500
GPH 247 206 185 148 137 124 106 103
93
82
74
68
22.4 LPH 931 779 700 560 518 469 401 389 352 310 280 257
BTI-100 90,000
GPH 291 242 218 175 162 145 125 121 109
97
87
81
26.4 LPH 1104 915 825 662 613 548 473 457 412 367 329 306
K
L
In. mm In. mm
1
25
1 1/4 32
110F°
61C°
67
253
79
299
M
In.
mm
1/2 13 11 15/16 303
1/2 13 11 15/16 303
120F°
67C°
62
234
73
276
126F° 130F° 140F°
70C° 72C° 78C°
59
57
53
223
215
200
69
67
62
261
253
234
Recovery capacity based on 80% thermal efficiency.
TABLE 3, GAS AND ELECTRICAL CHARACTERISTICS
Manifold Pressure
MODEL
Type of Gas
Inches W.C.
BTI (80, 100)
Natural Gas
3.5
kPa
0.87
Electrical Characteristics
Volts/Hz
Amperes
120/60
<5
All Models:Maximum supply pressure = 14.0 in. W.C. (3.48 kPa)
Minimum supply pressure, Natural gas = 4.5 in. W.C. (1.12 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.
FOREWORD
The installation must conform to these instructions and the local code
authority having jurisdiction.
The design of models BTI-80 and 100 comply with the latest version of
ANSI Z21.10.3/CSA 4.3 as automatic storage or automatic circulating tank
type water heaters.
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.
National Fuel Gas Code, ANSI Z223.1 / NFPA 54 and the National Electric
Code, NFPA 70;
In the United States:
In Canada:
Installation Code CAN/CSA B149.1-00 and the Canadian Electric Code CSA
C22.1.
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.
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.
2
TABLE OF CONTENTS
Page
ROUGH-IN DIMENSIONS ..................................................................
FOREWORD ...................................................................................
GENERAL SAFETY INFORMATION
Precautions ................................................................................
Grounding Instructions ...............................................................
Chemical Vapor Corrosion ..........................................................
Liquid Petroleum Models ..............................................................
Extended Non-use Periods .........................................................
Insulation Blankets ......................................................................
High Altitude Installations .............................................................
Circulating Pump .........................................................................
Dishwashing Machine Requirements ..........................................
INSTALLATION INSTRUCTIONS
Required Ability ...........................................................................
Locating The Heater ...................................................................
Clearances .................................................................................
Hard Water .................................................................................
Air Requirements ........................................................................
Venting .......................................................................................
Thermometers (Not Supplied) ......................................................
Water Potable Heating and Space heating ...................................
Relief Valve ................................................................................
Gas Piping ..................................................................................
Heater Wiring .............................................................................
Wiring Diagram ...........................................................................
Purging .......................................................................................
Page
Gas Pressure Regulation ........................................................... 9
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
2
2
3
3
3
3
3
3-4
4
4
4
4
4-5
5
5
5
6
6
6
6-7
7
8
8
9
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.
LIQUID PETROLEUM MODELS
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.
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.
EXTERNAL FIRE.
DAMAGE.
FIRING WITHOUT WATER.
SOOTING.
Your BTI-80 and 100-110 series are not for use with LP gas.
EXTENDED NON-USE PERIODS
Heater must be protected from freezing downdrafts during shutdown
periods.
WARNING
GROUNDING INSTRUCTIONS
HYDROGEN GAS CAN BE PRODUCED INA HOT WATER SYSTEM SERVED
BYTHIS HEATER THAT HAS NOT BEEN USED FORALONG 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 FAUCETAT THE TIME IT IS OPEN.
This water heater must be grounded in accordance with the National Electric
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
INSULATION BLANKETS
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.
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
3
heater meets or exceeds the ASHRAE/IES 90.1b-1999 standards with
respect to insulation and standby loss requirement making an insulation
blanket unnecessary.
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.
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.
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.
•
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.
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 not allow insulation to come within 2" (5cm) of the floor to prevent
blockage of combustion air flow to the burner.
CIRCULATING PUMP
•
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.
A circulating pump is used when a system requires a circulating loop or
there is a storage tank used in conjunction with the heater. Refer to the
piping diagrams at rear of manual for electrical hookup information and
install in accordance with the latest version of the National Electric Code
ANSI/NFPA No. 70. In Canada refer to Canadian Electrical Code CSA C22.1.
Only all bronze circulators are used with commercial water heaters. Although
circulators are oiled and operated by the manufacturer some circulators
must be oiled again before operating. Please refer to manufacturer’s
instructions.
HIGH ALTITUDE INSTALLATIONS
DISHWASHING MACHINE REQUIREMENT
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.
These appliances meet the National Sanitation Foundation Standard for
sanitary installations when used with the following leg kits, Part No’s. 65700 and 6570-7.
All dishwashing machines meeting the National Sanitation Foundation
requirements are designed to operate with water flow pressures between
15 and 25 psi (103Kpa and 173 Kpa). Flow pressures above 25 psi
(173Kpa), or below 15 psi (103 Kpa), will result in improperly sanitized
dishes. Where pressures are high, a water pressure reducing or flow
regulating control valve should be used in 180 0F(82°C) line to the
dishwashing machine, and should be adjusted to deliver water between
these limits.
You should contact your gas supplier for any specific changes which may
be required in your area.
The National Sanitation Foundation also recommends circulation of 1800F
(82°C) water. Where this is done, the circulation should be very gentle so
that it does not cause any unnecessary turbulence inside the water heater.
The circulation should be just enough to provide 1800F (82°C) water at the
point of take-off to the dishwashing machine. Adjust flow by means of the
plug cock in the circulating line.
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
INSTALLATION INSTRUCTIONS
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).
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.
LOCATING THE HEATER
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
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 PERMITOPERATION OF GASAPPLIANCES IF INSTALLED 18 INCHES
Field conversion for operation at altitudes other than that
specified on the heater rating plate is not permitted.
4
(45.7 CM) OR MORE ABOVE THE FLOOR. THIS MAY REDUCE THE RISK IF
LOCATION IN SUCH AN AREA CANNOT BE AVOIDED.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION OR VENTILATING AIR.
WARNING
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.
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.
THIS HEATER SHALL BE LOCATED OR PROTECTED SO IT IS NOT
SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.
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.
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
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. SUCHA CONDITION
OFTEN WILLRESULT INAYELLOW, LUMINOUS BURNER FLAME, CAUSING
CARBONING OR SOOTING OF THE COMBUSTION CHAMBER, BURNERS
AND FLUE TUBES AND CREATES A RISK OFASPHYXIATION.
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.
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
WILLCAUSEAIRTO BE DRAWN INTO THE ROOM THROUGH THE CHIMNEY,
CAUSING POOR COMBUSTION. SOOTING MAY RESULT IN SERIOUS
DAMAGE TO THE HEATER AND RISK OF FIRE OR EXPLOSION.
THE HEATER SHOULD BE LOCATED IN AN AREA WHERE LEAKAGE
FROM THE HEATER OR CONNECTIONS WILL NOT RESULT IN
DAMAGE TO THE ADJACENT AREA OR TO LOWER FLOORS OF THE
STRUCTURE.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILATING AIR.
ADEQUATEAIR FOR COMBUSTIONAND VENTILATION MUSTBE PROVIDED
FOR SAFE OPERATION.
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.
UNCONFINED SPACE
In buildings of conventional frame, brick, or stone construction, unconfined
spaces may provide adequate air for combustion, ventilation and draft hood
dilution.
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, A.O. Smith Enterprises, Ltd., P.O. Box 310-768 Erie
Street, Stratford, Ontario N5A 6T3.
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.
For appliance installation locations with elevations above 2000 feet (610
meters), refer to HIGH ALTITUDE INSTALLATIONS section of this manual
for input reduction procedure.
CLEARANCES
CONFINED SPACE
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.
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 (2,225mm2/Kw) of the
total input of all appliances in the enclosure, but not less than 100 square
inches (645 square cm).
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.
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
(8,900mm2/Kw) of the total input of all appliances in the enclosure. If
horizontal ducts are used, each opening shall have a free area of not less
than one square inch per 2000 Btuh (4,450mm2/Kw) of the total input of all
appliances in the enclosure. For Canadian installations consult CAN/CSA
B149.1-00.
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.
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE
MATERIALS, GASOLINE AND OTHER FLAMMABLES, VAPORS AND
LIQUIDS.
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
latest edition of the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and
with the Category I Venting Tables.
FIGURE 2
VENT CONNECTION
In Canada, venting shall conform to the requirements of the current CAN/
CGA B149.1-00 installation code.
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.
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.
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.
CIRCULATING RETURN LINE CONNECTIONS
TEMPERED WATER LOOP, IF USED, CONNECT TO POINT "A".
STORED TEMPERATURE WATER LOOP, IF USED, CONNECT TO
COLD WATER INLET
VACUUM RELIEF
VALVE
*INSTALL PER
LOCAL CODES.
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
6
THERMOMETERS (Not Supplied)
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.
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 OUTLETAND 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.
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.
3.
This unit may NEVER be connected to any existing heating system or
component(s) previously used with a non-potable water heating
appliance.
4.
When the system requires water for space heating at temperatures
higher than required for domestic water purposes, a tempering valve
must be installed. Please refer to installation diagram on page 6 of
this manual for suggested piping arrangements.
See SERVICE INFORMATION section for procedure and precautions.
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.
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.
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 latest
version of the National Fuel Gas Code. For Canadian installations consult
Canadian Installation Code CAN/CSA B149.1-00.
CAUTION
A closed system will exist if a check valve (without bypass), pressure
reducing valve (without bypass), or a water meter (without bypass) is
installed in the cold water line between the water heater and street main
(or well).
Excessive pressure may develop in such closed systems, causing
premature tank failure or intermittent relief valve operation. 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.
WARNING
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER THAN 14.0"
W.C.(3.48 Kpa) - NATURAL GAS SUPPLY GAS PRESSURE. EXPOSURE TO
HIGHER SUPPLY PRESSURE MAY CAUSE DAMAGE TO THE GAS VALVE
WHICH COULD RESULT IN FIRE OR EXPLOSION. IF OVERPRESSURE HAS
OCCURRED SUCH AS THROUGH IMPROPER TESTING OF GAS LINES OR
EMERGENCY MALFUNCTION OF THE SUPPLY SYSTEM, THE GAS VALVE
MUST BE CHECKED FOR SAFE OPERATION. MAKE SURE THAT THE
OUTSIDE VENTS ON THE SUPPLY REGULATORS AND THE SAFETY VENT
VALVES ARE PROTECTED AGAINST BLOCKAGE. THESE ARE PARTS OF
THE GAS SUPPLY SYSTEM, NOT THE HEATER. VENT BLOCKAGE MAY
OCCUR DURING ICE STORMS.
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.
RELIEF VALVE
IT IS IMPORTANT TO GUARD AGAINST GAS VALVE FOULING FROM
CONTAMINANTS IN THE GAS WAYS. SUCH FOULING MAY CAUSE
IMPROPER OPERATION, FIRE OR EXPLOSION.
This water heater is equipped with a combination temperature-pressure
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 B149.1-00. FOR SAFE OPERATION OF THE WATER HEATER,
THE RELIEF VALVE(S) MUST NOT BE REMOVED OR PLUGGED.
IF COPPER SUPPLY LINESARE USED THEY MUST BE INTERNALLYTINNED
AND CERTIFIED FOR GAS SERVICE. BEFORE ATTACHING THE GAS LINE,
BE SURE THATALL GAS PIPE IS CLEAN ON THE INSIDE.
ASME ratings cover pressure relief capacities. A.G.A. ratings cover release
rate with temperature actuation.
TO TRAPANY 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. 5). 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.
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 and automatic gas shutoff devices for hot water supply
systems. ANSI Z21.22.
To prevent damage, care must be taken not to apply too much torque when
attaching gas supply pipe to gas valve inlet.
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
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.
7
HEATER WIRING
All electrical work must be installed in the United States in accordance with the latest version of the National Electrical Code ANSI/NFPA No. 70, in
Canada, with the latest version 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.
WIRING DIAGRAM AND SCHEMATIC - FIGURE 4
8
PURGING
TABLE 4 - GAS SUPPLY LINE SIZES (IN INCHES)*
MAXIMUM CAPACITY OF PIPE IN
CUBIC FEET PER HOUR
LENGTH
IN
FEET 1/2"
10
175
20
120
30
97
40
82
50
73
60
66
70
61
80
57
90
53
100
50
125
44
150
40
175
37
200
35
LENGTH
IN
METERS 1/2"
3.0
51
6.1
35
9.1
28
12.2
24
15.2
21
18.3
19
21.3
18
24.4
17
27.4
16
30.5
15
38.1
13
45.7
12
53.3
11
61.0
10
3/4"
360
250
200
170
151
138
125
118
110
103
93
84
77
72
3/4"
105
73
59
50
44
40
37
35
32
30
27
25
23
21
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
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
Gas line purging is required with new piping or systems in which air has
entered.
CAUTION
4"
23000
15800
12800
10900
9700
8800
8100
7500
7200
6700
6000
5500
5000
4600
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.
4"
6735
4626
3748
3192
2840
2577
2372
2196
2108
1962
1757
1610
1464
1347
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 5, refer to flow pressure taken at pressure
tap of automatic gas valve while heater is operating.
TABLE 5 – MANIFOLD PRESSURE SETTING
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.
Model
Number
BTI-80
Type of
Gas
Natural
BTI-100
Natural
Input
76,500 Btu/hr
22.4 KW/hr
90,000 Btu/hr
26.4 KW/hr
Manifold
Pressure
3.5 in. W.C.
0.87 kPa
3.5 in. W.C.
0.87 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.
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.
FIGURE 5 - GAS PIPING AND DIRT LEG INSTALLATION
WARNING
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
MUSTBE CAPPED WHEN DISCONNECTED FROM THE HEATER FOR TEST
PRESSURES OF 1/2 PSIG (3.45 Kpa) OR LESS. THE APPLIANCE NEED NOT
BEDISCONNECTED,BUTMUSTBEISOLATEDFROMTHESUPPLYPRESSURE
TEST BY CLOSING THE MANUAL GAS SHUTOFF VALVE.
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.
9
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.
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 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.
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
4.
This appliance is equipped with a device which
automatically lights the burner.
DO NOT TRY TO LIGHT THE BURNER BY HAND.
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.
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).
1.
STOP! Read the safety information above
on this label.
2.
Set the thermostat to the lowest setting.
CAUTION: Hotter water increases the
risk of scald injury. Consult the instruction
manual before changing temperatures.
3.
Turn the "ON/OFF" swich on the blower control to the
"OFF" position.
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 require settings at specific
lower temperatures.
Temperature
Setting
180°F (82°C)
170°F (77°C)
160°F (71°C)
150°F (66°C)
140°F (60°C)
130°F (54°C)
120°F (49°C)
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.
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, 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.
Time to Produce 2nd & 3rd
Degree Burns on Adult Skin
Nearly instantaneous
Nearly instantaneous
About 1/2 second
About 1-1/2 second
Less than 5 seconds
About 30 seconds
More than 5 minutes
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.
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.
2.
"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.
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.
2.
Temperature Setting
Display
BC DE F
F = approx. 180°F (82°C)
D = approx. 160°F (71°C)
B = approx. 140°F (60°C)
= approx. 120°F (49°C)
Time to Produce
2nd & 3rd Degree
Burns on Adult Skin
Nearly instantaneous
About 1/2 seconds
Less than 5 seconds
More than 5 minutes
FIGURE 6
3.
4.
5.
11
Seal any unused openings in the venting system.
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/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.
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.
Follow the lighting instruction. Place the water heater being inspected
in operation. Adjust thermostat so appliance shall operate continuously.
Test for vent system leakage after 5 minutes of main burner operation.
6.
7.
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.
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.
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.
1.
2.
3.
4.
Provide complete combustion of gas.
Cause rapid ignition and carryover of flame across entire burner.
Give reasonably quiet operation during ignition, burning and extinction.
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
BEFOREFURTHERUSE.CONSULTWITHA QUALIFIED SERVICETECHNICIAN.
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 COMBUSTIONAND VENTILATINGAIR TO THE
UNIT. MAINTAIN ACLEAR OPEN AREAAROUND THE HEATER AT ALLTIMES.
DO NOT STORE COMBUSTIBLES OR FLAMMABLE LIQUIDS NEAR OR
AROUND AN APPLIANCE.
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.
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.
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT
OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO THE APPLIANCE.
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.
SERVICE INFORMATION
TABLE 6
INPUT CHECK TIME REQUIRED TO CONSUME 1 CU. FT. OF GAS
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.
Model
Type of
Gas
BTU Per
Cu. Ft.
Time Required To Consume
1 Cu. Ft. of Gas
BTI-80
Natural
1050
47.3 sec.
BTI-100
Natural
1050
37.8 sec.
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
USERS OFTHISAPPLIANCE SHOULD BEAWARE THATGAS COMPONENTS
WEAR OUT OVERAPERIOD OF TIME. THE GAS CARRYING COMPONENTS
OF THISAPPLIANCE SHOULD BE INSPECTED FOR PROPER OPERATION
PERIODICALLY BYA QUALIFIED SERVICE TECHNICIAN.
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.
MAIN BURNER AND IGNITER
Btuh = Actual heater input rate.
Check main burner (figure 7) at least every 6 months for proper flame
characteristics. The main burner should display the following
characteristics:
Example: (Using BTI-80 heater)
T = 47.3 seconds/ft3
H = 1,050 Btu/ft3 (natural gas)
Btuh = ?
3,600 X 1,050 = 80,000 Btuh (23.4Kwh)
47.3
Compare the actual input rate to that given on the heater’s rating plate. In the
example, the BTI-80’s full input rate should be 80,000 Btuh (23.4 Kwh) for
natural gas.
VENT SYSTEM
FIGURE 7-MAIN BURNER AND IGNITER ASSEMBLY - NATURAL GAS
Examine the venting system every 6 months for obstructions and/or
deterioration of vent piping.
12
PREVENTIVE MAINTENANCE
BLOWER MAINTENANCE
For safety and satisfactory operation it is recommended that the blower be
checked once a year by a competent service person.
1.
2.
3.
RECOMMENDED PROCEDURE FOR PERIODIC REMOVAL
OF LIME DEPOSITS FROM TANK TYPE COMMERCIAL
WATER HEATERS
MOTOR - The motor is factory oiled and sealed and requires no further
maintenance.
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.
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.
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
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.
WARNING
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT
OFF, TURN OFF THE MANUAL GAS CONTROL VALVE TO THE
APPLIANCE.
Lime accumulation not only reduces the life of the equipment but also
reduces efficiency of the heater and increases fuel consumption.
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 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.
The time between cleaning will vary from weeks to months depending upon
water conditions and usage.
CAUTION
Refer to A. O. Smith booklet, Form No. 4800, entitled “Why? When and
How” for detailed description on tank inspection and cleanout.
Unauthorized removal of heater anode will void the warranty. Replace the
anode as necessary to maintain corrosion protection. For further information
contact your dealer.
UN•LIME® and the booklet may be obtained through your A. O. Smith dealer
or distributor.
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.
DELIMING SOLVENTS
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
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,
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.
UN•LIME may be obtained from your dealer, distributor or the A. O. Smith
Product Service Division. Order part no. 4763 (1 gal), packed 4 gallons
per case or part no. 4813 (5 gallon container).
Hydrochloric base acids are not recommended for use on glass-lined tanks.
CAUTION
Observe handling instructions on label of product being used.
13
TANK CLEANOUT PROCEDURE
Figure 9 illustrates most of the following steps.
The following practices will ensure longer life and enable the unit to operate
at its designed efficiency:
1.
2.
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.
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.
2.
With the Flo-Jug upright:
•
Take off cap, remove cover under opening and install 3/4" x 4" pipe
nipple.
•
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.
A cleanout opening is provided for periodic cleaning of the tank. Gas
must be shut off and heater drained before opening cleanout.
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.
3.
Remove lime, scale, or sediment using care not to damage the glass
lining.
5.
Inspect cleanout plate gasket, if new gasket is required, replace with
A. O. Smith part no. 99038.
6.
Install cleanout plate. Be sure to draw plate up tight by tightening
screws securely.
7.
Replace outer jacket cover plate.
Lift the Flo-Jug to the POUR POSITION and permit the UN•LIME to
flow into the heater as rapidly as possible.
•
4.
5.
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.
6.
7.
Place the Flo-Jug in the DELIME POSITION.
•
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.
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.
•
Deliming activity is indicated by foaming on the surface of the
solution.
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.
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.
•
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.
FIGURE 9
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 Water Products Company.
14
Be sure to keep the vent just above the liquid level.
8.
•
9.
2.
When deliming has been completed, the heater should be flushed for 3
to 5 minutes with fresh water.
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.
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.
•
Replace relief valve if removed for deliming.
•
Restore gas, oil or electrical supply to heater.
•
Check for water leakage.
•
Allow scale to separate from UN•LIME and settle on bottom of FloJug.
•
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 fig. 5, page 9.
•
Close the valve which feeds water to the cold water inlet at the top
of the heater.
•
Contact your dealer.
Look for leaking or open hot water faucets. Check for excessive
usage.
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.
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.
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.
If the heater was installed when incoming water temperatures were
warm, colder incoming temperatures will create the effect of less hot
water.
The thermostat water temperature adjusting dial may be set too low.
5.
If you cannot determine the cause of the problems, contact your dealer.
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.
Droplets from the bottom of the flue may be due to corrosive combustion
products or improper vent. Check with your dealer for more information.
WATER TEMPERATURE IS TOO HOT
1.
The thermostat water temperature adjusting dial may be set too high.
2.
If lowering control setting does not reduce the water temperature contact
your dealer.
CATHODIC PROTECTION-ANODE
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.
GAS SMELL AT THE HEATER
Close the main shutoff valve in the gas supply pipe near the heater,
see fig. 5 on page 9. The thermostat includes a gas control (top knob)
which can also be closed.
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.
Call your gas company.
WATER LEAKAGE IS SUSPECTED
1.
•
1.
4.
2.
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.
WATER HEATER MAKES SOUNDS
NOT ENOUGH OR NO HOT WATER
1.
•
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.
CHECKLIST
3.
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.
3.
10. Flo-Jug cleanup:
2.
•
When flushing is completed:
•
1.
The apparent leakage might be condensation. In warm or humid
locations, condensation can accumulate and run from within the heater
or its piping.
Check to see if the heater drain valve is tightly closed.
15
TROUBLESHOOTING
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).
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.
NOTE: Anode must remain installed (except for inspection) to avoid
shortening tank life. See LIMITED WARRANTY. Replace as necessary.
SERVICE AND REPAIR
For your safety, water heater service should be performed only by a qualified
service technician. Read the GENERAL SAFETY INFORMATION section
first.
The A.O. Smith water heater requires no special care other than the normal
maintanence 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.
WATER HEATING CYCLE
(GAS AND ELECTRIC POWER ARE ON,“OFF/ON” SWITCH IS ON)
1) CALLS FOR HEAT
A) THERMOSTAT SENSES NEED FOR HEATING WATER
B) CONTACTS CLOSE IN THERMOSTAT, POWER (115 VAC)
FLOWS TO BLOWER MOTOR
If you are having a problem with your A.O. Smith water heater and are not
pleased with the service you received:
•
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 Water Products Company
Service Department
500 Lindahl Parkway
Ashland City, TN 37015
2) BLOWER MOTOR ROTATES BLOWER WHEEL
A) BLOWER WHEEL SPEED INCREASES
B) WHEEL SPEED INCREASES, AIR PRESSURE SWITCH
CONTACTS CLOSE
3) 120 VAC FLOWS TO HOT SURFACE IGNITER
Canadian Customers
A.O. Smith Enterprises Ltd.
P.O. Box 310
768 Erie Street
Stratford, Ontario N5A 6T3
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.
or, going to our website at: www.hotwater.com
Please click on: "Mail",
then click on: "Service"
and leave us a message.
4) MAIN BURNER IGNITES
A) GAS FLOWS TO MAIN BURNER PORTS AND IS IGNITED
Please be sure to provide the following information when writing or e-mailing:
•
•
•
•
•
5) GAS VALVE SENSES BURNER FLAME
Model Number
Serial Number
Date of Original Purchase
Date Problem Originated
Explanation of Problem
6) BURNER HEATS WATER
A) BURNER HEATS WATER TO THERMOSTAT SETTING
B) CONTACTS IN THERMOSTAT OPEN,
C) CYCLE IS COMPLETED
Also, please be sure to include a daytime telephone number.
16
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
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
YELLOW FLAME
CONDENSATION
WATER LEAKS
LEAKING T&P VALVE
HOT WATER ODORS
OR COLOR
(Refer to CATHODIC
PROTECTION)
C) Not enough room air for proper
combustion
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
17
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.
Turn 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 4 and 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.
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.
LED STATUS
B C D E F
PROBLEM
An open earth ground circuit to the
ignition system.
SOLUTION
1. Check that the earth ground connection is
properly connected.
2. Check that the ground conductor on the
water heater is properly connected.
B C D E F
Wiring error or a high resistance to
earth ground.
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
than 5 seconds after the call for
heat began.
1. Pressure switch wiring is incorrect.
2. Replace pressure switch.
B C D E F
Pressure switch remained open longer
than 5 seconds after the combustion
blower was energized.
1. Pressure switch wiring is incorrect.
2. Pressure switch tubing not connected
correctly.
3. Air intake or exhaust obstructed.
B C D E F
Error in the hot surface ignitor circuit.
1. Check that all wiring is correct and secure.
2. Replace hot surface ignitor.
System in lockout.
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.
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.
1. Turn power to the water heater off for
10 seconds and then back on.
2. Replace gas control valve.
Flame signal sensed out of
proper sequence.
1. Replace gas control valve.
ECO activated.
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.
B C D E F
One of the temperature adjust
buttons stuck closed.
1. Press and release each of the buttons once.
2. Replace gas control valve.
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 gas control valve.
WATER HEATER CONTROL
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
10
18
Model BTI 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
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: (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.
19
REPLACEMENT PARTS
5621 W. 115TH STREET, ALSIP, IL 60803
PHONE: 1-800-433-2545 FAX: 1-800-433-2515
www.hotwater.com E-mail: parts@hotwater.com
20
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