American Water Heater BBCN375T754NV 100 Series Installation and user guide

1
PRINTED IN U.S.A. 1212 PART NO. 325370-000
MODELS BBCN375T754NV
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER
AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
COMMERCIAL ULTRA LOW NOx GAS WATER HEATER
Glass-Lined Tank-type Water Heater
• INSTALLATION • OPERATION • SERVICE • MAINTENANCE • LIMITED WARRANTY
CAUTION
TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION
RELATIVE TO YOUR SAFETY. PLEASE READ THOROUGHLY
BEFORE INSTALLING AND USING THIS APPLIANCE.
Series 100
www.americanwaterheater. com
American Water Heater
Johnson City, TN 37605

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FOREWORD
The design of model BBCN375T754NV complies with the current edition
of ANSI Z21.10.3/CSA 4.3 as automatic storage or automatic circulating
tank type water heaters.
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.
ROUGH-IN DIMENSIONS
FIGURE 1.
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:
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.
*INSTALL IN ACCORDANCE WITH LOCAL CODES
TOP VIEW
TABLE 3, GAS AND ELECTRICAL CHARACTERISTICS
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).
Minimum pressures must be maintained under both load and no load (static and dynamic) conditions.
Recovery ratings are based on 80% thermal efciency.
TABLE 1, DIMENSIONS
Units A B C D E F G H J K L M
Inches
CM
66 5/8
169.22
58 3/4
134.23
30 15/16
78.58
27 3/4
70.5
15 1/4
38.6
4
10.2
15 3/4
40.0
16
40.6
1 1/4
3.2
1 1/4
NPT
1/2
NPT
12 1/4
31.1
TABLE 2, RECOVERY RATINGS
Manifold Pressure Electrical Characteristics
Type of gas Inches W.C. kPa Voltz/Hz Amperes
Natural Gas 4.0 1.12 120/160 <5
INPUT RATE Recovery in US Gallons/hr or Liters/hr at Indicated Temperature Rise in Fahrenheit or Celsius
75,100 BTU/H °F 30 40 50 60 70 80 90 100 110 120 130 140
GPH 243 182 145 122 104 91 81 73 66 60 56 52
22 KW °C 17 23 28 33 39 44 50 56 61 67 72 78
LPH 920 688 549 460 392 344 306 277 251 228 213 199

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GENERAL SAFETY
INFORMATION
PRECAUTIONS
DO NOT USE THIS WATER HEATER IF ANY PART HAS BEEN UNDER
WATER. Immediately call a qualied service technician to inspect the
appliance and to replace any part of the control system and any gas
control which has been under water.
IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT OPERATE
HEATER UNTIL ALL CORRECTIVE STEPS HAVE BEEN MADE BY A
QUALIFIED SERVICEMAN.
1. EXTERNAL FIRE.
2. DAMAGE.
3. FIRING WITHOUT WATER.
4. SOOTING.
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.
TABLE OF CONTENTS
Page
ROUGH-IN DIMENSIONS............................................................. 2
FOREWORD ................................................................................. 2
GENERAL SAFETY INFORMATION............................................. 2-4
Precautions.................................................................................... 3
Grounding Instructions............................................................... 3
Chemical Vapor Corrosion......................................................... 3
Extended Non-use Periods........................................................ 3
Insulation Blankets..................................................................... 4
High Altitude Installations........................................................... 4
Circulating Pump ....................................................................... 4
INSTALLATION INSTRUCTIONS ................................................. 4-9
Required Ability.............................................................................. 4
Locating The Heater .................................................................. 4
Clearances................................................................................. 5
Hard Water ................................................................................ 5
Air Requirements....................................................................... 5
Venting....................................................................................... 6
Thermometers (Not Supplied) ................................................... 7
Combination Water (Potable) Heating and Space Heating ....... 7
Relief Valve................................................................................ 7
Gas Piping ................................................................................. 7
Heater Wiring............................................................................. 8
Wiring Diagram.......................................................................... 8
Purging ...................................................................................... 9
Gas Pressure Regulation.......................................................... 9
OPERATION................................................................................. 9
To Operate The Heater ............................................................. 9
Lighting Instructions.................................................................. 10
Temperature Regulation ........................................................... 11
Checking Venting...................................................................... 11
High Temperature Limit Switch ................................................. 11
SERVICE INFORMATION............................................................ 12-13
Main Burner and Igniter ............................................................ 12
Checking Gas Input .................................................................. 12
Vent System.............................................................................. 12
Blower Maintenance ................................................................. 13
Relief Valve............................................................................... 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 ......................................................... 14
CHECKLIST ................................................................................. 15-16
Condensation............................................................................ 15
Anode ....................................................................................... 15
Service & Repair....................................................................... 16
TROUBLESHOOTING ................................................................. 17-20
NOTES ......................................................................................... 21-22
LIMITED WARRANTY................................................................... 23
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.)
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 ow. THERE SHOULD BE NO SMOKING OR OPEN
FLAME NEAR THE FAUCET AT THE TIME IT IS OPEN.
Page

4
INSULATION BLANKETS
Insulation blankets available to the general public for external use
on gas water heaters are not required for use on your water heater.
The purpose of an insulation blanket is to reduce the standby heat
loss encountered with storage tank water heaters. Your water
heater meets or exceeds the current edition of ASHRAE/IES 90.1
standards with respect to insulation and standby loss requirement
making an insulation blanket unnecessary.
WARNING
Should you choose to apply an insulation blanket to this heater, you
should follow these instructions. Failure to follow these instructions
can result in fire, asphyxiation , serious personal injury or death.
• Do not 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 oor to prevent
blockage of combustion air ow 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 the manufacturer
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 ow.
HIGH ALTITUDE INSTALLATIONS
Water heaters covered in this manual have been tested and
approved for installation at elevations up to 7,700 feet (2,347
m) above sea level. For installation above 7,700 feet (2,347 m),
the water heater’s Btu input should be reduced at the rate of 4
percent for each 1,000 feet (305 m) above sea level which requires
replacement of the burner orifice in accordance with the National
Fuel Gas Code ANSI Z223.1/ NFPA 54. Contact your local gas
supplier for further information.
Failure to replace the standard orifice with the proper high altitude
orifice when installed at elevations above 7,700 feet (2,347 m)
could result in improper and inefficient operation of the water
heater, producing carbon monoxide gas in excess of the safe
limits. This could result in serious injury or death. Contact your
local gas supplier for any specific changes that may be required
in your area.
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.
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.
Only all bronze circulating pumps 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.
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.
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

5
installed in a carpeted alcove or closet, the entire oor 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.
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.
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 from the
manufacturer, authorized service agencies or distributors.
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.
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.
AIR REQUIREMENTS
REFER TO 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 THE FLOW OF THE COMBUSTION OR
VENTILATING AIR.
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 ANEGATIVE 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 qualied service
technician at the time of installation and periodically thereafter to ensure
a down-draft condition does not exist.
WARNING
FOR SAFE OPERATION PROVIDEADEQUATE AIR FOR COMBUSTION
AND VENTILATION. AN INSUFFICIENT SUPPLY OF AIR WILL CAUSE
RECIRCULATION OF COMBUSTION PRODUCTS RESULTING IN
AIR CONTAMINATION THAT MAY BE HAZARDOUS TO LIFE. SUCH
A CONDITION OFTEN WILL RESULT IN A YELLOW, LUMINOUS
BURNER FLAME, CAUSING CARBONING OR SOOTING OF THE
COMBUSTION CHAMBER, BURNERS AND FLUE TUBES AND
CREATES A RISK OF ASPHYXIATION.
Where an exhaust fan is supplied in the same room with a heater,
sufcient 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.
UNCONFINED SPACE
In buildings of conventional frame, brick, or stone construction,
unconned spaces may provide adequate air for combustion, ventilation
and draft hood dilution.
If the unconned 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 conned spaces in tightly constructed buildings must be followed to
ensure adequate air supply.
CONFINED SPACE
When drawing combustion and dilution air from inside a conventionally
constructed building to a conned 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).
If the conned 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.

6
CAUTION: IF BUILDING COLD WATER SUPPLY HAS ABACK-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.
CIRCULATING RETURN LINE CONNECTIONS
TEMPERED WATER LOOP, IF USED, CONNECT TO POINT "A".
STORED TEMPERATURE WATER LOOP, IF USED, CONNECT TO
COLD WATER INLET
WARNING
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE
USE TEMPERATURE AT FIXTURES. SEE TEMPERATURE
REGULATION ON PAGE 11. IF HIGHER PREHEAT
TEMPERATURES ARE NECESSARY TO OBTAIN
ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD
VALVE FOR HOT WATER SUPPLIED TO FIXTURES.
SINGLE TEMPERATURE
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.
This water 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 water 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 red 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 ue gas exhauster
must be employed to assure proper venting and correct combustion.
MIXING VALVE APPLICATION FOR TWO TEMPERATURE WATER
VACUUM RELIEF
VALVE
*INSTALL PER
LOCAL CODES.

7
THERMOMETERS (Not Supplied)
Thermometers should be obtained and field installed as shown in
Figure 3.
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.
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.
5. These water heaters cannot be used in space heating applications
only.
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.
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
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.
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.
WARNING
THE PURPOSE OF RELIEF VALVE IS TO AVOID EXCESSIVE PRESSURE
OR TEMPERATURE INTO THE STEAM RANGE, WHICH MAY CAUSE
SCALDING AT FIXTURES, TANK EXPLOSION, SYSTEM OR HEATER
DAMAGE. NO VALVE IS TO BE PLACED BETWEEN THE RELIEF
VALVE AND TANK.
Your local code authority may have other specific relief valve
requirements.
A DRAIN LINE MUST BE CONNECTED TO THE RELIEF VALVE TO
DIRECT DISCHARGE TO A SAFE LOCATION TO AVOID SCALDING OR
WATER DAMAGE. THIS LINE MUST NOT BE REDUCED FROM THE
SIZE OF THE VALVE OUTLET AND MUST NOT CONTAIN VALVES,
RESTRICTIONS NOR SHOULD IT BE LOCATED IN FREEZING AREAS.
DO NOT THREAD OR CAP THE END OF THIS LINE. RESTRICTED OR
BLOCKED DISCHARGE WILL DEFEAT THE PURPOSE OF THE VALVE
AND IS UNSAFE. DISCHARGE LINE SHALL BE INSTALLED TO ALLOW
COMPLETE DRAINAGE OF BOTH THE VALVE AND LINE.
See SERVICE INFORMATION section for procedure and precautions.
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 gures 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.
WARNING
The minimum gas supply pressure for input adjustment is 6.0" kPa W.C.
for natural gas (11.0" kPa W.C. for propane).
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER THAN
14" kPa WATER COLUMN 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.
IT IS IMPORTANT TO GUARD AGAINST GAS VALVE FOULING FROM
CONTAMINANTS IN THE GAS WAYS. SUCH FOULING MAY CAUSE
IMPROPER OPERATION, FIRE OR EXPLOSION.
IF COPPER SUPPLY LINES ARE USED THEY MUST BE INTERNALLY
TINNED AND CERTIFIED FOR GAS SERVICE. BEFORE ATTACHING THE
GAS LINE, BE SURE THAT ALL GAS PIPE IS CLEAN ON THE INSIDE.
TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS SUPPLY
LINE, A DIRT LEG (SOMETIMES CALLED SEDIMENT TRAP OR DRIP
LEG) MUST BE INCORPORATED IN THE PIPING (SEE FIG. 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 CURRENT EDITION OF THE NATIONAL FUEL GAS CODE.
For Canadian installations consult Canadian Installation Code CAN/
CSA-B149.1.
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 rst two threads. Use
compounds resistant to the action of liqueed petroleum gases.

8
FIGURE 4. WIRING DIAGRAM AND SCHEMATIC
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 ame 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.

9
TABLE 4. GAS SUPPLY LINE SIZES (IN INCHES)*
MAXIMUM CAPACITY OF PIPE IN
CUBIC FEET PER HOUR
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.
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.
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 sufcient capacity to supply the full rated gas
input of the water heater as well as the requirements of all other gas red
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 specied 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 specied in Table 5, refer to ow pressure taken at pressure
tap of automatic gas valve while heater is operating.
TABLE 5.
Type of
Gas Input
Manifold
Pressure
Natural 75,100 Btu/hr
22 KW/hr
4.0 in. W.C.
1.12 kPa
OPERATION
It is recommended that a qualied person perform the initial ring 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 lled.
4. Close the hot water faucet as water starts to ow.
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.
LENGTH
IN
FEET
NORMAL IRON PIPE SIZES (INCHES)
INPUT IN THOUSANDS BTU/HR
1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3" 4"
10 175 360 680 1400 2100 3960 6300 11000 230000
20 120 250 485 950 1460 2750 4360 7700 15800
30 97 200 375 770 1180 2200 3520 6250 12800
40 82 170 320 660 990 1900 3000 5300 10900
50 73 151 285 580 900 1680 2650 4750 9700
60 66 138 260 530 810 1520 2400 4300 8800
70 61 125 240 490 750 1400 2250 3900 8100
80 57 118 220 460 690 1300 2050 3700 7500
90 53 110 205 430 650 1220 1950 3450 7200
100 50 103 195 400 620 1150 1850 3250 6700
125 44 93 175 360 550 1020 1650 2950 6000
150 40 84 160 325 500 950 1500 2650 5500
175 37 77 145 300 460 850 1370 2450 5000
200 35 72 135 280 430 800 1280 2280 4600
LENGTH
IN
METERS
NORMAL IRON PIPE SIZES (INCHES)
INPUT IN KW
1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3" 4"
3.0 51 105 199 410 615 1160 1845 3221 6735
6.1 35 73 142 278 428 805 1277 2255 4626
9.1 28 59 110 225 346 644 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 64 165 202 381 600 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

10
5. Wait ve (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 rst pressing the
COOLER and HOTTER buttons together and
holding for 1 second. Then press the HOTTER
button.
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).
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING: If you do not follow these instructions exactly, a re or explosion
may result causing property damage, personal injury or loss of life.
• If you cannot reach your gas supplier, call the re
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 qualied service
technician. Force or attempted repair may result in a
re or explosion.
D. Do not use this appliance if any part has been under
water. Immediately call a qualied 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
A. Set thermostat to the lowest setting.
B. Turn off all the electric power to the appliance
if service is to be performed.
TO TURN OFF GAS TO APPLIANCE
BEFORE OPERATING: ENTIRE SYSTEM MUST BE FILLED WITH WATER AND AIR PURGED FROM ALL LINES.
1. STOP! Read the safety information above
on this label.
2. Set the thermostat to the lowest setting by rst pressing
the COOLER and HOTTER buttons together
and holding for 1 second. Then press the COOLER
button until the WARM indicator light appears.
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.
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 oor because
some gas is heavier than air and will settle on the oor.
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.
CAUTION: Hotter water increases the risk
of scald injury. Consult the instruction
manual before changing temperatures.
WARNING: TURN OFF ALL ELECTRIC
POWER BEFORE SERVICING

11
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 specic 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.
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.
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.
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 deciencies 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 replace dampers.
4. Follow the lighting instruction. Place the water heater being
inspected in operation. Adjust thermostat so appliance shall operate
continuously.
5. Test for vent system leakage after 5 minutes of main burner operation.
TEMPERATURE REGULATION
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 from the manufacturer, authorized service agencies or
distributors. When ordering parts be sure to have the complete water
heater Model Number, Serial Number and Series Number available. This
information can be found on the rating label afxed to the water heater.
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 satises
your hot water needs. This will also provide the most energy efcient
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
Display 2nd & 3rd Degree
Temperature Setting B C D E F Burns on Adult Skin
F = approx. 180°F (82°C) Nearly Instantaneous
E = approx. 170°F (77°C) Nearly Instantaneous
D = approx. 160°F (71°C) About 1/2 Second
C = approx. 150°F (65°C) About 1 1/2 Seconds
B = approx. 140°F (60°C) Less than 5 Seconds
B = approx. 130°F (54°C) More than 30 Seconds
= approx. 120°F (49°C) More than 5 Minutes
FIGURE 6.

12
1. Provide complete combustion of gas.
2. Cause rapid ignition and carryover of ame across entire burner.
3. Give reasonably quiet operation during ignition, burning and extinction.
4. Cause no excessive lifting of ames from burner ports.
If preceding burner characteristics are not evident, check for accumulation
of lint or other foreign material that restricts or blocks the air openings
to the heater or burner.
WARNING
SOOT BUILD-UP INDICATES A PROBLEM THAT REQUIRES
CORRECTION BEFORE FURTHER USE. CONSULT WITH A
QUALIFIED SERVICE TECHNICIAN.
Should the main burner or burner air openings require cleaning, remove
the burner and clean with a soft brush. Clean main burner orice with a
suitable soft material.
CHECK FOR GOOD FLOW OF COMBUSTION AND VENTILATING AIR
TO THE UNIT. MAINTAIN A CLEAR OPEN AREAAROUND 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.
TABLE 6
INPUT CHECK TIME REQUIRED TO CONSUME 1 CU. FT. OF GAS
Use this formula to “clock” the meter. Be sure that other gas consuming
appliances are not operating during this interval.
3,600 X H = Btu/h
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:
T = 47.2 seconds/ft3
H = 1,050 Btu/ft3(natural gas)
Btuh = ?
3,600 X 1,050 = 75,100 Btu/h (22Kw)
50.3
Compare the actual input rate to that given on the heater’s rating plate.
In the example, the full input rate should be 75,000 Btu/h (22 Kw) for
natural gas.
VENT SYSTEM
Examine the venting system every 6 months for obstructions and/or
deterioration of vent piping.
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, replace 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.
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 ow
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.
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 qualied servicemen, using appropriate test
equipment, be allowed to service the heater.
FOR YOUR SAFETY AND SATISFACTORY OPERATION, IT IS
RECOMMENDED THAT THIS HEATER BE CHECKED ONCE A YEAR
BY A COMPETENT SERVICE PERSON.
USERS OF THIS WATER HEATER SHOULD BE AWARE THAT GAS
COMPONENTS WEAR OUT OVER A PERIOD OF TIME. THE GAS
CARRYING COMPONENTS OF THIS WATER HEATER 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
ame characteristics. The main burner should display the following
characteristics:
FIGURE 7. MAIN BURNER AND IGNITER ASSEMBLY
Type of Gas BTU Per Cu. Ft. Time Required To Con-
sume 1 Cu. Ft. of Gas
Natural 1050 50.3 Seconds
BURNER HEAD
ASSEMBLY
BURNER TUBE
ASSEMBLY
H.S.I.
ASSEMBLY

13
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 ow. 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.
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 qualied service technician
to nd 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.
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, ush thoroughly, and rell. If the problem persists,
chlorination of the heater and replacement of the factory installed
magnesium anode with aluminum anode may correct the condition.
Occasionally water softener companies recommend removal of heater
anodes for odor reasons.
CAUTION
Unauthorized removal of heater anode will void the warranty. Replace
the anode as necessary to maintain corrosion protection. For further
information contact your dealer.
WINTER PROTECTION
In regions where freezing weather is encountered, all water must be
drained from unit and piping when out of service (water shut off). Drain
valve must be left open until unit is returned to service.
REPLACEMENT PARTS
Replacement parts may be ordered from the manufacturer,
authorized service agencies or distributors. When ordering parts
be sure to have the complete water heater Model Number, Serial
Number and Series Number available. This information can be
found on the rating label affixed to the water heater. Refer to the
parts list included with the water heater from the factory for more
information or call the parts department or technical support phone
number listed on the back cover of this manual for further assistance.
PREVENTIVE MAINTENANCE
RECOMMENDED PROCEDURE FOR PERIODIC
REMOVAL OF LIME DEPOSITS FROM TANK TYPE
COMMERCIAL WATER HEATERS
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.
Lime accumulation not only reduces the life of the equipment but also
reduces efciency 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.
The time between cleaning will vary from weeks to months depending
upon water conditions and usage.
UN•LIME®and the booklet may be obtained through your dealer
or distributor.
DELIMING SOLVENTS
UN•LIME is recommended 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.
UN•LIME may be obtained from your dealer, distributor or water heater
manufacturer. Order Part Number 9005416105, 1 gallon, packed 4
gallons per case or Part Number 9005417105, 5 gallon container.
NOTE: Un•Lime is not available for use in Canada. Hydrochloric base
acids are not recommended for use on glass-lined tanks.
CAUTION
Observe handling instructions on label of product being used.

14
TANK CLEANOUT PROCEDURE
The following practices will ensure longer life and enable the unit to
operate at its designed efciency:
1. Once a month the heater should be ushed. 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.
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.
6. Install cleanout plate. Be sure to draw plate up tight by tightening
screws securely.
7. Replace outer jacket cover plate.
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, UN•LIME
Professional Delimer should be used.
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 ttings. Contact your dealer
or distributor.
Figure 9 illustrates most of the following steps.
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.
3. Lift the Flo-Jug to the POUR POSITION and permit the UN•LIME
to ow 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.
• 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.
5. Lower the Flo-Jug to the DRAIN POSITION and allow the UN•LIME
to ow 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.
6. Continue the deliming process:
• Raise jug to POUR POSITION. Allow solution to ow 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 ow 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 the clamp, hose and the pipe nipple from heater
drain opening.
• Observe interior through opening - a small ashlight 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.
8. When deliming has been completed, the heater should be ushed
for 3 to 5 minutes with fresh water.
• Remove the deliming equipment, install the drain valve, open the

15
cold water inlet line and allow water to ow through heater and out
drain valve. Don’t forget to plug vent and cap opening in Flo-Jug.
9. When ushing 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.
• Replace relief valve if removed for deliming.
• Restore gas, oil or electrical supply to heater.
• Check for water leakage.
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.
CHECKLIST
Before contacting your dealer, check the water heater to see if the apparent
malfunction is caused by some external fault. Consulting this checklist
may eliminate the need for a repair call and restore hot water service.
NOT ENOUGH OR NO HOT WATER
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 underred heater will not produce hot water at its
normal recovery rate.
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.
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.
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.
2. The apparent leakage might be condensation. In warm or humid
locations, condensation can accumulate and run from within the
heater or its piping.
• When a water heater is rst installed and lled, the bottom of the
tank might condense water. The water accumulation, if excessive,
can drip into the oor 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 qualied service technician should be called to determine the
cause of the problem and to correct it.
4. If you cannot identify or correct the source of water leakage:
• Close the main 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
ame. This is a normal sound and may be disregarded.
2. Sediment and water scale accumulations may cause rumbling
noises. See MAINTENANCE or contact your dealer for details of
ushing the heater.
3. If you cannot identify or remedy the condition, contact your dealer.
CONDENSATION
Water vapor can condense on the cooler surfaces of the tank forming
droplets, these drip into the re or run out on the oor. 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 ue may be due to corrosive combustion
products or improper vent. Check with your dealer for more information.
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 sacrices
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.
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 qualied technician, and at a minimum should be
checked annually after the warranty period.
A hydrogen sulde (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).

16
NOTE: Anode must remain installed (except for inspection) to
avoid shortening tank life. See LIMITED WARRANTY. Replace
as necessary.
SERVICE AND REPAIR
The 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.
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.
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.
For your safety, water heater service should be performed only
by a qualified service technician. Read the GENERAL SAFETY
INFORMATION section rst.
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
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
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

17
TROUBLESHOOTING
For your safety, water heater service should be performed only by a qualied service technician.
Read the GENERAL SAFETY INFORMATION section rst.
PROBLEM POSSILBE MALFUNCTION SERVICE TO BE PERFORMED
NOT ENOUGH OR NO HOT WATER
1) Blower will not run.
A) "ON/OFF" control switch turned off. Turn switch to the on position.
B) Blower unplugged. Plug blower back into 115 vac. outlet.
C) No power at outlet. Repair service to outlet.
D) "ON/OFF" switch defective. Replace switch.
E) Control harness defective. Replace control harness.
F) Blower motor defective. Replace blower and motor.
2) Blower running, burner not on Replace switch.
A) Fan not running fast enough to close
air switch contacts.
Check for low voltage, less than 102 vac.,
have service checked and repaired.
B) Air pressure switch defective. Replace switch.
C) Gas valve defective. Replace gas control valve/ thermostat.
D) Control harness defective. Replace harness.
E) Igniter defective. Replace ignitor.
F) Unit has completed three trials to light
and fail.
Reset cycle by turning switch off and then
back on. If unit does not light in three tri-
als, contact a qualied person for service.
3) Thermostat problems
A) Thermostat set too low. Set temperature control higher.
B) Thermostat or ECO defective. Replace gas control valve/thermostat.
C) High limit control circuit open. Replace high limit control.
4) Others
A) Heater undersized. Reduce hot water usage.
B) Low gas pressure. Contact a qualied person for service.
C) Incoming water is unusually cold. Allow more time for heater to re-heat.
D) Leaking hot water pipes or xtures. Have plumber check and repair leaks.
CONDENSATION A) Water on the oor under heater. See "Condensation"
WATER LEAKS
Improperly sealed, hot or cold supply
connections, relief valve, drain valve or
thermostat threads.
Turn off heater & water, repair unit.
Leakage from other appliances or water
lines.
Inspect other appliances near water
heater.
Condensation of ue products. Refer to "CONDENSATION"
LEAKING T&P VALVE
Thermal expansion in closed water sys-
tem
Install thermal expansion tank (DO NOT
PLUG T&P VALVE)
Improperly seated valves Check relief valve for proper operation
(DO NOT PLUG T&P VALVE)
HOT WATER ODORS OR COLOR
(Refer to CATHODIC PROTECTION)
High sulfate or mineral content in water
supply or iron or sulfate reducing bacteria
in water supply
Drain and ush heater thoroughly, chlori-
nate, rel and ush again then chlorinate
water supply.

18
TROUBLESHOOTING GUIDELINES
TROUBLE SHOOTING
Please check guidelines below. For your safety, water heater service should be performed only by a qualied service technician.
Read the GENERAL SAFETY INFORMATION section rst.
INTELLI-VENT TROUBLESHOOTING CHART - USER CONTROL
PROBLEM SOLUTION
Inadequate or no earth ground 1. Ensure the wall outlet is properly grounded.
1 sensed by the Intelli-Vent™
control. 2. Ensure all ground connections/wires on the
water heater are secure.
Power supply to Intelli-Vent™ 1. Ensure the wall outlet is properly wired.
2 control has reversed polarity or a
high resistance to earth ground. 2. Ensure all internal 120 VAC wiring connections and
wiring harness have no reversed wires. 120 VAC
“hot” wire must connect to the on/off switch.
3. Ensure the wall outlet is properly grounded.
4. Ensure all ground connections/wires on the water
heater are secure.
Pressure switch circuit remaining 1. Ensure air pressure switch circuit wiring is correct
3 closed for more than 5 seconds and the air pressure switch is not jumpered.
after heating cycle begins.
Blower does not start. 2. Secure power to water heater, check continuity of air
pressure switch contacts with wires disconnected.
Service Note:
Disconnect power - disconnect one A If pressure switch contacts show continuity (closed
wire from the air pressure switch circuit) replace the pressure switch.
or the vent temperature limit
switch. Turn power back on - B If pressure switch contacts are open and all wiring
blower should start. is correct - turn the power off for 10-20 seconds
then on again to clear the error code - if the error
code persists replace the Intelli-Vent™ control.
Pressure switch circuit remains open 1. Ensure the blower is running - check for 120 VAC to
4 longer than 5 seconds after the blower the blower when the heating cycle begins, check the
is energized. wiring. If the control does not energize the blower -
replace the Intelli-Vent™ control. If the blower fails to
Blower may run continuously in start when energized - replace the blower assembly.
this condition.
2. Ensure the air pressure switch sensing tube is properly
connected - not kinked or damaged.
3. Check continuity of vent temperature limit switch - replace
switch if contacts remain open under 160ºF (71°C).
4. Ensure the correct size of vent pipe (2”, 3”, 4”) was used
Service Note: per installation manual for vent length. Ensure maximum
To learn more about performing Air number of elbows or equivalent feet of vent pipe has not
Pressure Switch tests visit our web exceeded maximum limits.
site www.hotwater.com to download
technical bulletin A-023-06 Air Pressure 5. Ensure there are no obstructions in the vent pipe.
Switches.
6. Check air pressure switch performance - check pressure
with a digital manometer - check continuity of contacts.
(see service note in left column) If the switch proves
defective - replace the air pressure switch and or the
blower assembly as required.
7. If air pressure switch performance test results prove
the air pressure switch is working properly and error
code 4 persists - replace the Intelli-Vent™ control.
The Intelli-Vent™ control has detected 1. Check wiring to the hot surface ignitor - replace ignitor
5 an open ignitor circuit. assembly if wiring is damaged or worn.
Service Note: 2. Check ignitor assembly plug and the socket on the
The resistance (ohms) of a hot surface Intelli-Vent™ body for good connection. Replace
ignitor will increase over time. If the ignitor assembly and/or control if necessary.
resistance at room temperature is near
18.8 ohms - consider replacing the ignitor 3. Check resistance of ignitor at room temperature 77ºF
as a preventative measure. (25°C) at the plug end. Replace ignitor if resistance
is not within 11.5 and 18.8 ohms at room temperature.
4. If results from the above tests were good and error
code 5 persists - replace the Intelli-Vent™ control.
B C D E F
# LED STATUS
WATER HEATER CONTROL
B C D E F
B C D E F
B C D E F
B C D E F

19
TROUBLESHOOTING GUIDELINES
TROUBLE SHOOTING
Please check guidelines below. For your safety, water heater service should be performed only by a qualied service technician.
Read the GENERAL SAFETY INFORMATION section rst.
INTELLI-VENT TROUBLESHOOTING CHART - USER CONTROL
PROBLE
MS
OLUTION
Ignition/flame failure.
6
The water heater has reached the
maximum number of retries and is
currently lockedout for one hour.
Cycle the power to the water heater
off and on to reset.
Service Note:
Theresistance(ohms) of a hot surface
ignitor will increaseovertime. If the
resistanceatroom temperatureis near
18.8 ohms - consider replacing the ignitor
as a preventative measure.
Self diagnostic tests have found a problem 1. Turn the power off for 10-20 seconds then on again to
7with the gas valve driver circuit, internalclear these error codes.
microprocessor, or other internal circuits. 2. If any of these error codes persist or cannot be cleared-
replace the Intelli-Vent™ control.
8
9
Flame signal has been sensed out of 1. Turn the power off for 10-20 seconds and then on again
10 proper sequence. to clear this error code.
2. Replace the Intelli-Vent™ control if this error code persists.
Water temperature in the tank has 1. Turn the power off for 10-20 seconds then on again
11 exceeded 195°F(91°C) and has to clear this error code.
activated the ECO. 2. Replace the Intelli-Vent™ if the error code persists.
The self diagnostic check detected one
12
13
14
or both of the temperature adjust buttons
are stuck.
The self diagnostic test has detected the
watertemperature sensor (thermistor)is
either open or shorted. 2. Replace the Intelli-Vent™ control if this error code persist.
# LED STATUS
WATERHEATERCONTROL
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
B C D E F
1. Press and release temperature adjust buttons. If above
action does not clear error, control will continue to regulate
water temperature at last setting. However, settings will no
longer be adjustable - the control should be replaced.
1. Turn power off for 10-20 seconds then on again to
clear this error code.
4. Ensure the flame sensor is clean - use ultra fine steel
wool or Scotch-Brite™ pad to clean flame sensor.
5. Ensure the hot surface ignitor is positioned to provide
consistent ignition.
6. Check for any cracks in ignitor assembly ceramic
insulators - replace ignitor assembly if damaged.
7. Check resistance of ignitor at room temperature (77ºF)
(25°C) at the plug end. Replace ignitor if resistance is
not within 11.5 and 18.8 ohms at room temperature.
8. Ensure correct size of vent pipe (2”, 3”, 4”) was used per
installation manual for vent length. Using larger pipe than required
may cause excessive air turbulance in combustion chamber.
1. Turn off power to the water heater.
2. Insure black resistor wire is not cut, missing, and is installed
between pins 3 & 4 of ignitor assembly plug. Replace ignitor
assembly if damaged or defective.
3. Unplug ignitor assembly plug from control. Check resistance
of black resistor wire between pins 3 & 4 with an ohm meter.
3.1 If reading taken is less than 2000 (5000 for date code 0617
through 0709) or more than 1.7 million ohms, replace ignitor
assembly. 3.2 If reading taken is between 2000 (5000 for date
code 0617 through 0709) and 1.7 million ohms, replace
Intelli- Vent™ control.
Service Note: Raised ridges on ignitor assembly plug identify
#1, #2, and #3 pins. The four-digit date code can be found on
side of the controller.
Self-diagnostic test found a problem with black
resistor wire on the ignitor assembly plug; resistor
wire is open or shorted.
Service Note: To perform this test ohm meter
used must be capable of reading up to 2,000,000
ohms. Unless ohm meter used has an auto-range
feature resistance should be checked twice. First
reading will be taken using an ohms scale above
1,700,000 ohms. Second reading is taken using
ohms scale just above 2,000 or 5,000 ohms.
2. Low supply voltage - should be 115 -125 VAC.
3. Ensure flame sensor is making good contact with burner
flame, ensure flame is steady see #8 below.
1. Gas supply
is turned off-pressure too low. Ensure supply and
manifold
gas pressures are within requirements in installation
manual. Manifold gas pressure is non-adjustable if pressure is
off by more than
0.3” W.C. (75 Pa)
replace Intelli-Vent™ control.

20
TROUBLESHOOTING GUIDELINES
TROUBLE SHOOTING
Please check guidelines below. For your safety, water heater service should be performed only by a qualied service technician.
Read the GENERAL SAFETY INFORMATION section rst.
INTELLI-VENT TROUBLESHOOTING CHART - USER CONTROL
PROBLE
MS
OLUTION
15
# LED STATUS
B C D E F 1. Turn off power to the water heater.
2. Unplug the ignitor assembly plug from the control. Check
the resistance of the black resistor wire between pins
3 & 4 with an ohm meter. 2.1 If the reading taken is more
than 100,000 (50,000 for data code before 0616; 70,000
for data code 0617 through 0709) ohms replace the ignitor
assembly. 2.2 If the reading taken is less than 100,000
(50,000 for data code before 0616; 70,000 for data code
0617 through 0709) ohms replace Intelli-Vent™ control.
The self-diagnostic test determined resistance
of the black resistor wire on ignitor assembly
plug is not within tolerance.
1. Ensure air pressure switch hose is not kinked or clogged;
ensure the blower housing is clear of any condensation.
2. Check vent temperature limit switch - if it is determined
that the vent temperature limit switch is opening its
contacts at normal operating temperatures during heating
cycle - replace the vent temperature limit switch.
3. Ensure water heater is not over-firing. 3.1 Check burner
orifice size and ensure the correct orifice is installed;
replace as necessary. 3.2 Check manifold gas pressure
and ensure it is within
0.3” W.C. (75 Pa) of listed rating on
Intelli-Vent™ control valve. Manifold gas pressure is
non-adjustable, if manifold gas pressure is off by more
than
0.3” W.C. (75 Pa), replace the Intelli-Vent™ control.
4. Ensure condensate lines are not obstructed. Check and
clear all condensate lines including the floor condensate
drain line.
Air pressure switch circuit is opening
repeatedly during one heating cycle. May be
caused by air pressure switch and/or the vent
temperature limit switch (these two switches
are wired together in a “series” circuit).
16
B C D E F
WATER HEATER CONTROL