American Water Heater 74 Gallon 80 Thermal Efficiency UltraLow NOx Heavy Duty Commercial Gas Water Heater User Manual

							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 .americanwaterheate r.co m
American Wa ter Heater
Johnson Cit y, TN 37605 
						

							2
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 (stati\
c and dynamic) conditions.
Recovery ratings are based on 80% thermal efficiency. 
TABLE 1, DIMENSIONS
Units
AB CDEFGHJK 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.kPaVoltz/Hz Amperes
Natural Gas 4.01.12 120/160 
						

							3
GENERAL SAFETY INFORMATION
PRECAUTIONS
DO NOT USE THIS WATER HEATER IF ANY PART HAS BEEN UNDER 
WATER.  Immediately  call  a  qualified  service  technician  to  inspect  the 
appliance and to replace any part of the control system and any gas 
control which has been under water.
IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT OPERATE 
HEATER UNTIL ALL CORRECTIVE STEPS HAVE BEEN MADE BY A 
QUALIFIED SERVICEMAN.
1.  EXTERNAL FIRE.
2. DAMAGE.
3.  FIRING WITHOUT WATER.
4. SOOTING.
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
 WARNINGCORROSION 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 condition\
ing 
refrigerants, swimming pool chemicals, calcium and sodium chloride (wat\
er 
softener salt), waxes, and process chemicals are typical compounds whic\
h 
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
 WARNINGHYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM 
SERVED BY THIS HEATER THAT HAS NOT BEEN USED FOR A LONG 
PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE). HYDROGEN 
GAS IS EXTREMELY FLAMMABLE. To reduce the risk of injury under 
these conditions, it is recommended that the hot water faucet be opened 
for several minutes at the kitchen sink before using any electrical appliance 
connected to the hot water system. If hydrogen is present, there will 
probably be an unusual sound such as air escaping through the pipe as 
the water begins to flow. THERE SHOULD BE NO SMOKING OR OPEN 
FLAME NEAR THE FAUCET AT THE TIME IT IS OPEN.
 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 ASHR AE/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 floor to prevent 
blockage of combustion air flow to the burner.
•  Do not  cover the instruction manual.  Keep it on the side of the water 
heater or nearby for future reference.
•  Do obtain new warning and instruction labels from 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 flow.
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 
TR ADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR 
SUPPLY, VENTING, ELECTRICAL AND GAS SUPPLY WORK 
ARE REQUIRED.
L O C AT I N G  T H E  H E AT E R
  WARNING
THERE IS A RISK IN USING FUEL BURNING APPLIANCES SUCH 
AS GAS WATER HEATERS IN ROOMS, GAR AGES OR OTHER 
AREAS WHERE GASOLINE, OTHER FLAMMABLE LIQUIDS OR 
ENGINE DRIVEN EQUIPMENT OR VEHICLES ARE STORED, 
OPER ATED OR REPAIRED.  FLAMMABLE VAPORS ARE HEAV Y 
AND TR AVEL ALONG THE FLOOR AND MAY BE IGNITED BY THE 
HEATER’S PILOT OR MAIN BURNER FLAMES CAUSING FIRE 
OR EXPLOSION.  SOME LOCAL CODES PERMIT OPER ATION 
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 floor shall be covered 
by the panel.  Also, see the drain requirements.
THIS HEATER SHALL BE LOCATED OR PROTECTED SO IT IS 
NOT SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.
  WARNING
FLAMMABLE ITEMS
, PRESSURIZED CONTAINERS OR ANY 
OTHER POTENTIAL FIRE HA ZARDOUS 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 
LEAK AGE 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 
DR AIN 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/
C SA - 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.
 WARNINGATTIC AND/OR EXHAUST FANS OPERATING ON THE PREMISES 
WITH A WATER HEATER CAN RESULT IN CARBON MONOXIDE 
POISONING AND  DEATH.
OPERATION OF THESE FANS CAN PRODUCE A NEGATIVE DRAFT IN 
THE AREA OF THE WATER HEATER PREVENTING THE PRODUCTS 
OF COMBUSTION FROM EXHAUSTING THROUGH THE CHIMNEY 
OR VENT PIPE.
The venting of the water heater should be inspected by a qualified service 
technician at the time of installation and periodically thereafter to ensure 
a down-draft condition does not exist.
 WARNING
FOR SAFE OPERATION PROVIDE ADEQUATE AIR FOR COMBUSTION 
AND VENTILATION. AN INSUFFICIENT SUPPLY OF AIR WILL CAUSE 
RECIRCULATION OF COMBUSTION PRODUCTS RESULTING IN 
AIR CONTAMINATION THAT MAY BE HAZARDOUS TO LIFE. SUCH 
A CONDITION OFTEN WILL RESULT IN A YELLOW, LUMINOUS 
BURNER FLAME, CAUSING CARBONING OR SOOTING OF THE 
COMBUSTION CHAMBER, BURNERS AND FLUE TUBES AND 
CREATES A  RISK  OF ASPHYXIATION.
Where an exhaust fan is supplied in the same room with a heater, 
sufficient openings for air must be provided in the walls.   UNDERSIZED 
OPENINGS WILL CAUSE AIR TO BE DRAWN INTO THE ROOM 
THROUGH THE CHIMNEY, CAUSING POOR COMBUSTION. 
SOOTING MAY RESULT IN SERIOUS DAMAGE TO THE HEATER 
AND RISK OF FIRE OR EXPLOSION.
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, 
unconfined spaces may provide adequate air for combustion, ventilation 
and draft hood dilution.
If the unconfined space is within a building of tight construction (buildings  
using the following construction: weather stripping, heavy insulation, 
caulking, vapor barrier, etc.), air for combustion, ventilation and draft hood 
dilution must be obtained from outdoors.  The installation instructions 
for confined spaces in tightly constructed buildings must be followed to 
ensure adequate air supply.
CONFINED SPACE
When drawing combustion and dilution air from inside a conventionally 
constructed building to a confined space, such a space shall be provided 
with two permanent openings, ONE IN OR WITHIN 12 INCHES (30.5cm) 
OF THE ENCLOSURE TOP AND ONE IN OR WITHIN 12 INCHES 
(30.5cm) OF THE ENCLOSURE BOTTOM.  Each opening shall have 
a free area of at least one square inch per 1000 Btuh (2,225mm
2/Kw) of 
the total input of all appliances in the enclosure, but not less than 100 
square inches (645 square cm).
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 
(8,900mm
2/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 (4,450mm
2/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 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.
CIRCULATING RETURN LINE CONNECTIONS
TEMPERED WATER LOOP, IF USED, CONNECT TO POINT "A".  
STORED TEMPERATURE WATER LOOP, IF USED, CONNECT TO 
COLD WATER INLETWARNING
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 fired equipment to 
the duct work of ventilation systems.
•  Where  a  separate  vent  connection  is  not  available  and  the  vent 
pipe from the heater must be connected to a common vent with an 
oil burning furnace, the vent pipe should enter the smaller common 
vent or chimney at a point above the large vent pipe.
FIGURE 2.
VENT CONNECTION
Vent connections must be made to an adequate stack or chimney. Size 
and install proper size vent pipe.  Do not reduce pipe size to less than 
that of the blower outlet.
Horizontal runs of vent pipe must have a minimum upward slope toward 
the chimney of 1/4 inch per foot (2cm per meter).  Dampers or other 
obstructions must not be installed in between the heater and the blower.  
Be sure that the vent pipe does not extend beyond the inside wall of 
the chimney.
Where a continuous or intermittent back draft is found to exist, the 
cause must be determined and corrected.  A special vent cap may be 
required.  If the back draft cannot be corrected by the normal methods or 
if a suitable draft cannot be obtained, a blower type flue gas exhauster 
must be employed to assure proper venting and correct combustion.
MIXING VALVE APPLICATION FOR TWO TEMPERATURE WATER
VACUUM RELIEF
       VA LV E
*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 
o n l y.
 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 w\
ater 
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 figures shown 
are for straight lengths of pipe at 0.5 in. W.C. pressure drop, which is 
considered normal for low pressure systems.  Note:  Fittings such as 
elbows, tees and line regulators will add to the pipe pressure drop.  Also 
refer to the current edition of the National Fuel Gas Code. For Canadian 
installations consult Canadian Installation Code CAN/CSA-B149.1.
 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 threa\
ds 
of  pipe  joints.    Do  not  apply  compounds  to  the  first  two  threads.    Use 
compounds resistant to the action of liquefied 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 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. 
						

							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.
  CAUTIONPURGING SHOULD BE PERFORMED BY PERSONS EXPERIENCED 
IN THIS TYPE GAS SERVICE. TO AVOID RISK OF FIRE OR 
EXPLOSION, PURGE DISCHARGE MUST NOT ENTER CONFINED 
AREAS OR SPACES WHERE IGNITION CAN OCCUR. THE AREA 
MUST BE WELL VENTILATED AND ALL SOURCES OF IGNITION 
MUST BE INACTIVATED OR REMOVED.
GAS METER SIZE — NATURAL GASES ONLY
Be sure the gas meter has sufficient capacity to supply the full rated gas 
input of the water heater as well as the requirements of all other gas fired 
equipment supplied by the meter.  If gas meter is too small, ask the gas 
company to install a larger meter having adequate capacity.
GAS PRESSURE REGULATOR
The gas pressure regulator is built into the gas valve and is equipped to 
operate on the gas specified on model and rating plate. The regulator is 
factory adjusted to deliver gas to burner at correct water column pressure 
allowing for a nominal pressure drop through the controls.
The minimum gas supply pressure for input adjustment must not be less 
than 6" w.c. (1.49 kPa) for natural gas and 11" w.c. (2.73 kPa).
Do not subject the combination gas valve to inlet gas pressures of more 
than 14.0" w.c. (3.48 kPa) - natural gas.  A service regulator is necessary 
if higher gas pressures are encountered.
Gas pressure specified in Table 5, refer to flow pressure taken at pressure 
tap of automatic gas valve while heater is operating.
TABLE 5.
Type ofGas InputManifold 
Pressure
Natural 75,100 Btu/hr
22 KW/hr 4.0 in. W.C.
1.12 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.
  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 175360680 1400 21003960630011000 230000
20 120250485 950 146027504360 7700 15800
30 97200 375 770 118022003520 6250 12800
40 82170 320 660 9901900 3000 5300 10900
50 73151 285 580 9001680 2650 4750 9700
60 66138 260 530 8101520 2400 4300 8800
70 61125 240 490 7501400 2250 3900 8100
80 5711 8 220 460 6901300 2050 3700 7500
90 5311 0 205 430 6501220 1950 3450 7200
100 50103 195 400 6201150 1850 3250 6700
125 4493175 360 5501020 1650 2950 6000
150 4084160 325 5009501500 2650 5500
175 3777145 300 4608501370 2450 5000
200 3572135 280 4308001280 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 51105199410 615 11601845 32216735
6.1 3573142278 428 8051277 22554626
9.1 285911 0225 346 6441031 18303748
12.2 245094193 290 556878 15523192
15.2 214483170 264 492776 13912840
18.3 194076155 237 445703 12592577
21.3 183770143 220 410659 11422372
24.4 173564165 202 381600 10832196
27.4 163260126 190 357571 10102108
30.5 15305711 7 182 337542 9521962
38.1 132751105 161 299483 8641757
45.7 12254795 146 278439 7761610
53.3 11234288 135 249401 7171464
61.0 10214082 126 234375 6881347 
						

							105. 
Wait five (5) minutes                   to clear out any gas.  
If you then smell gas,           STOP!  Follow "B" in 
the safety information                above on this label.
  If you don't smell gas, go to next step.
6.  Turn on all electrical power to the appliance.
7.   Set thermostat to desired setting by first pressing the 
COOLER 
  and HOTTER   buttons together and 
holding for 1 second. Then press the HOTTER 
  
button.
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 fire or explosion 
may result causing property damage, personal injury or loss of life.
•   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
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 first 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 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.
CAUTION:  Hotter water increases the risk 
of scald injury.  Consult the instruction 
manual before changing temperatures.
WARNING:  TURN OFF ALL ELECTRIC
POWER BEFORE SERVICING