American Water Heater 40 Gallon 42000 BTU UltraLow Nox Power Vent Natural Gas Water Heater PVUG6240T42NV User Manual

							11
Vent Pipe System
This water heater must be properly vented for removal 
of exhaust gases to the outside atmosphere.  Correct 
installation of the vent pipe system is mandatory for the 
safe and efficient operation of this water heater and is an 
important factor in the life of the unit.
The vent pipe must be installed in accordance with state 
and local codes, or in the absence of such, the National 
Fuel Gas Code, NFPA 54, ANSI Z223.1-current edition.   
IMPORTANT: Check to make sure the vent pipe is not 
blocked in any way. NOTE:  Do not common vent this 
water heater with any other appliance. Do not install in the 
same chase or chimney with a metal or high-temperature 
plastic from another gas or fuel burning appliance.
Vent Pipe Material
The following plastic materials may be used for both the 
combustion air inlet and exhaust outlet piping subject to 
state and local codes:
  •  2 or 3 inch Schedule 40 PVC or ABS
  •  2 or 3 inch Schedule 40 or 80 CPVC
  •  2 or 3 inch Schedule 40 PVC, Cellular Core,   ASTM F891
  •  2 or 3 inch Schedule 40 ABS DWV, Cellular Core,    ASTM F628
  •  DWV Pipe is acceptable
Plastic pipe and fittings are available through most 
plumbing suppliers. Always check the marking on the pipe 
to make sure you are using the correct material.
Vent Pipe Connection to Blower
A 3”x2” condensate drain coupler is supplied with every 
40-42K BTU model to connect either 2” or 3” venting to the 
blower.  The initial connection must be made with 2” vent pipe.  
However, after the initial connection, you may use either 2” 
or 3” vent pipe.  See Figure 8 and Table 4.    
IMPORTANT: These connections must be properly sealed to 
prevent the leakage of the products of combustion into the 
living area. If needed, 3”x2” condensate drain couplers are 
available through the Parts Department for new installations or 
retrofits where condensate may run back to the blower.
2-Inch Vent Pipe 
Connection 3-Inch Vent Pipe 
Connection
2-Inch 
Vent Pipe
3-Inch 
Vent Pipe
Reducer
Condensate
Drain 
CouplerHook-up for 
Condensate 
Line
BlowerBlower Screws 
(4 total)
Screws 
(4 total)
Secure the vent  pipe and drain coupler to the 
blower with four  (4) self-drilling  screws as 
shown. Use two  screws per joint  (one on each  side).   
Figure 8  
Blower/Vent Pipe 
Connections
Vent Pipe Installation
The following guidelines should be followed when installing 
the exhaust outlet piping:
•  Venting should be as direct as possible with a    
minimum number of pipe fittings.
•  Vent diameter must not be reduced unless       specifically noted in the installation instructions. •  Support all horizontal pipe runs every four feet    
and all vertical pipe runs every six feet or      
according to local codes. 
•  Vents run through unconditioned spaces where below  freezing temperatures are expected should be properly 
insulated to prevent freezing.  For horizontal runs, 
wrap the vent pipe with self-regulating 3 or 5 watt heat 
tape. The heat tape must be U.L. listed and installed 
per the manufacturer’s instructions.
•  Do not connect this venting system with an existing  vent or chimney.
•  Do not common vent with the vent pipe of  any other water heater or appliance.
The exhaust outlet piping and termination may be installed 
in one of the following type terminations:
      1.) Standard Horizontal; 2.)  Vertical.  
All pipe, fittings, pipe cement, primers and procedures 
must conform to American National Standard Institute and 
American Society for Testing and Materials (ANSI/ASTM) 
standards in the United States. This water heater has been 
design certified by CSA International for use with the listed 
plastic vent pipe material. IMPORTANT: Do not use vent 
elbows in this vent pipe installation. See Figure 8A. All joints 
in the outlet piping must be properly cemented. Size and cut 
all piping before cementing.
1.   Cut the pipe end square and remove all ragged  edges and burrs. Make sure the inside of the pipe is clean 
and free of cuttings and loose dirt.  Chamfer the end 
and apply primer to the fitting and pipe.  
2.   Using a suitable grade of pipe cement, apply a  moderate, even coat inside the fitting.  Apply a liberal 
amount of cement to the outside of the pipe to socket 
depth. NOTE: It is important to select the proper pipe 
cement for the type plastic pipe being used.
3.   Assemble the parts quickly while the cement is still  wet. Twist the pipe 1/4 turn during insertion and hold 
for 30 seconds.
Vent Pipe Length
Size the exhaust outlet as specified in Table 4. This table 
lists the maximum allowable length in feet of the exhaust 
outlet pipe as related to the number of required elbows and 
the termination. The specified maximum lengths are for 
exhaust pipe systems. Minimum pipe length is 3 feet with 
one elbow.
1.   Determine termination type and pipe size.
2.  Determine number of elbows in exhaust pipe.  (Do not include elbows in the termination.)  The corresponding 
number indicates the maximum length of exhaust pipe.
3.  If the total length of vent pipe is less than 20 feet, it is  recommended that you install the debris screen with 
restrictor (provided).  See Figure 8A.  
CORRECT FITTINGS
   Mesh MetalRodent Screen 90° Medium
Sweep Elbow 45° Sweep 
Elbow 90° Long
Sweep Elbow
INCORRECT FITTINGS
90° Vent Elbow
45° Vent
Elbow
Tee Connector
Correct and Incorrect
Pipe Fittings
Figure 8A
Debris Screen
w/ Restrictor 
						

							12
Table 4 - Maximum Allowable Length in Feet of Exhaust Pipe - (42K BTU/Hr models only)
Pipe Size  (in)Number of 90° Elbows (medium or long sweep only)Termination  Options
0123456
2 40 35 30 25 20 15 10 Std. Horizontal
2 40 35 30 25 20 15 10 Vertical
3 120 115 110 105 100 95 90 Std. Horizontal
3 120 115 110 105 100 95 90 Vertical
Notes:
1. N/A - Not Applicable
2. The above maximum lengths are for outlet pipe systems. 
3. Maximum of 6 elbows may be used. Use only medium or long         
    sweep elbows. See figure 8 for details.
4. Two 45° elbows are considered equivalent to one 90° elbow.
5. Minimum length is 3 foot with 1 elbow.
6. Use schedule 40 or 80 CPVC, 40 ABS, or 40 PVC pipe and fittings.
Vent Termination Locations
The exhaust outlet must be installed with the following 
minimum clearances (see figure 9):
•    Twelve inches above grade or maximum 
anticipated snow level.
•    Twelve inch minimum clearance on top or four foot  clearance below or to the side of door or window 
that may be open.  •   Four feet horizontally and vertically from gas    
or electric meters, gas regulators, dryer vents,    
vent hoods, bathroom fan exhaust, attic fans    
and turbines.
•    Two feet from an inside corner formed by two     exterior walls. 
•    Two feet from porches, decks, overhangs and     other obstructions.
In addition to maintaining the minimum clearances, the 
vent should terminate according to the following guidelines:
1.  Do not expose any reducers or bushings to outdoor  ambient temperatures. 
2.   The exhaust outlet must not terminate under a patio,  deck or any covered area.
3.   Do not terminate the vent near walkways or into   alleys or other publicly accessible areas.
4.   Do not terminate the vent in an area where  children or animals could block pipes.
5.   Do not locate the vent terminal too close to shrubs or  bushes.
6.  Caulk all cracks, seams and joints within 6 feet     horizontally above and below the vent.
Figure 9
Minimum Termination Clearance for 
Outlet Vent
A.  12 in (30 cm) min. clearance above grade, veranda, porch, deck, balcony, or maximum 
anticipated snow level.
B.  12 in. (30 cm) min. clearance on top or 4 ft.  clearance below or to the side of door or window 
that may be open.
C.  Clearance to permanently closed window.**
D.  12 in (30 cm) min. vertical clearance to ventilated  soffit located above the terminal within a horizontal  
distance of 2 ft (61 cm) from the center line of the  
terminal.
E.  12 in (30 cm) min. clearance to unventilated soffit.
**Clearance in accordance with local installation codes and the requirem\
ents of the gas supplier. 
US Installations F.  Clearance to outside corner. **
G.  2 ft (61 cm) clearance to inside corner formed by two   exterior walls.
H.  4 ft (122 cm) clearance to each side of center line  extending above meter/regulator assembly.
I.  4 ft (122 cm) clearance to service regulator vent outlet.
J.  12 in (30 cm) clearance on top or 4 ft (122 cm) clear- ance below or to the side of nonmechanical air supply 
inlet to building or the combustion air inlet to any other 
appliance.
K.  3 ft (91 cm) above if within 10 ft (3 m) horizontally  of  mechanical air supply inlet. 
						

							13
Vertical Termination
The vertical exhaust outlet requires a return bend or two 
medium or long sweep radius 90° elbows to keep the 
exhaust outlet downward and prevent entry of rain. Do 
not include these elbows when calculating the maximum 
allowable vent pipe because they have already been 
considered in the vent tables. The vertical exhaust outlet 
termination is a 2 inch or 3 inch pipe which must be at 
least 12 inches above the roof line or anticipated snow 
levels. See Figure 11. 
Follow all applicable code requirements. 
NOTE: A rodent screen is available through the Parts 
Department for installations where animals may be able to 
access the vent system.
Figure 11    
Vertical vent termination 
Anticipated
Snow Level
12” Min.
12” Min.
Exhaust Air 
Outlet
Roof
OUTLET VENT TERMINATIONS
Standard Horizontal Termination
The standard horizontal exhaust outlet termination is a 
2 inch or 3 inch pipe which terminates at least 12 inches 
above grade or anticipated snow levels.  To prevent 
potential condensate from collecting in the venting system, 
slope the vent at a downward pitch of 1/8” per 5 ft. away 
from the water heater.  See Figure 10.
Install the correct size coupling at the outside wall on the 
exhaust to prevent the termination from being pushed inward.   
Follow all applicable code requirements. 
NOTE: A rodent screen is available through the Parts 
Department for installations where animals may be able to 
access the vent system.
Figure 10 
Standard Horizontal Termination    
12” Min. above grade or 
anticipated snow level.Outside Wall
Vent pipe must slope downward 
toward wall: 1/8” per 5 ft.  A Downward 
slope assists condensate drainage.
Vent Pipe
Vent 
Terminal 
						

							14
WATER SYSTEM PIPING
FIGURE 13
Typical Mixing 
Valve Installation
Tempered Water
to fixtures
Cold
Water Inlet
Mixing Valve
(set to 120°F
 or lower)
Piping Installation
Piping, fittings, and valves should be installed according to 
the installation drawing (Figure 12). If the indoor installation 
area is subject to freezing temperatures, the water piping 
must be protected by insulation.
Water supply pressure should not exceed 80 psi. If this 
occurs, a pressure limiting valve with a bypass may need 
to be installed in the cold water inlet line. This should 
be placed on the supply to the entire house in order to 
maintain equal hot and cold water pressures.
IMPORTANT: Heat cannot be applied to the water fittings 
on the heater as they may contain nonmetallic parts. If 
solder connections are used, solder the pipe to the adapter 
before attaching the adapter to the hot and cold water 
fittings.
IMPORTANT: Always use a good grade of joint compound 
and be certain that all fittings are drawn up tight.
1.  Install the water piping and fittings as shown in Figure 
12. Connect the cold water supply (3/4” NPT) to the 
fitting marked “C”. Connect the hot water supply (3/4” 
NPT) to the fitting marked “H”. IMPORTANT:  Some 
models may contain energy saving heat traps to 
prevent the circulation of hot water within the pipes. Do 
not remove the inserts within the heat traps.
2.  The installation of unions in both the hot and cold  water supply lines is recommended for ease of 
removing the water heater for service or replacement.
3.  The manufacturer of this water heater recommends  installing a mixing valve or an anti-scald device in the 
domestic hot water line as shown in Figure 13. These 
valves reduce the point of use temperature of the 
water by mixing cold and hot water and are readily 
available for use. Point of use devices for reducing 
scald hazards that attach to faucets and shower heads 
are also available from plumbing supply houses.
Contact a licensed plumber or the local plumbing 
authority.
4.  If installing the water heater in a closed water system,  install an expansion tank in the cold water line as 
specified under “Closed System/Thermal Expansion”.
5.  Install a shut-off valve in the cold water inlet line. It  should be located close to the water heater and be 
easily accessible. Know the location of this valve and 
how to shut off the water to the heater.
6.  A temperature and pressure relief valve must be  installed in the opening marked “Temperature and 
Pressure (T & P) Relief Valve” on the water heater. 
Add a discharge line to the opening of the T & P relief 
valve. Follow the instructions under Temperature and 
Pressure Relief Valve”.
Hot Water 
Outlet  In a closed system use a 
thermal expansion tank 
Cold Water 
Inlet Valve  Pressure Reducing 
Valve with Bypass 
Main Water 
Supply 
Cold Water Supply 
to Fixture 
Temperature and 
Pressure Relief Valve 
Discharge line 
6” Max. above 
drain  Drain line 3/4” 
ID Min. Drain 
1“ Min. 
Metal Drain 
Pan 1-3/4” 
Depth Max.  Massachusetts: 
Install a vacuum relief 
in cold water line per 
section 19 MGL 142 
Figure 12 
  
Typical water piping installation 
Discharge Line 3/4” Min.
Do not cap or plug.
Please note the following: 
•  The system should be installed only with piping that is 
suitable for potable (drinkable) water such as copper, 
CPVC, or polybutylene. This water heater must not be 
installed using iron piping or PVC water piping.
•  Use only pumps, valves, or fittings that are compatible  with potable water.
•  Use only full flow ball or gate valves. The use of valves  that may cause excessive restriction to water flow is 
not recommended.  
•  Use only 95/5 tin-antimony or other equivalent solder.  Any lead based solder must not be used.
•  Piping that has been treated with chromates, boiler  seal, or other chemicals must not be used.
•  Chemicals that may contaminate the potable water  supply must not be added to the piping system. 
						

							15
Closed System/Thermal Expansion
CAUTION - PROPERTY DAMAGE HAZARD
As water is heated, it expands (thermal expansion). In a 
closed system, the volume of water will increase. As the 
volume of water increases, there will be a corresponding 
increase in water pressure due to thermal expansion. 
Thermal expansion can cause premature tank failure 
(leakage). This type of failure is not covered under the 
limited warranty. Thermal expansion can also cause 
intermittent temperature-pressure relief valve operation: 
water discharged from the valve due to excessive pressure 
build up. The temperature-pressure relief valve is not 
intended for the constant relief of thermal expansion. This 
condition is not covered under the limited warranty.
A properly sized thermal expansion tank should be installed 
on all closed systems to control the harmful effects of 
thermal expansion. Contact a plumbing service agency or 
your retail supplier regarding the installation of a thermal 
expansion tank.   IMPORTANT:  Only a new temperature and pressure relief 
valve should be used with your water heater. Do not use an 
old or existing valve as it may be damaged or not adequate 
for the working pressure of the new water heater. Do not 
place any valve between the relief valve and the tank.
T&P Valve and Pipe Insulation (Some Models)
1.  Locate the temperature and pressure relief valve on the 
water heater (also known as the T&P relief valve).  See 
Figure 14B. 
2.  Locate the slit running the length of the insulation.
3.  Spread this slit open and slip it over the T&P relief valve.  See Figure 14B.  Apply gentle pressure to the insulation 
to ensure it is fully seated on the T&P relief valve.  Once 
seated, secure the insulation with duct tape, electrical 
tape, or equivalent.  IMPORTANT: The insulation or tape 
must not block the discharge opening or hinder access to 
the manual relief lever (Figure 14B).  Ensure a discharge 
pipe is installed into the T&P valve discharge opening per 
the instructions in this manual.
4.  Locate the hot water (outlet) & cold water (inlet) pipes to  the water heater.  
5.  Select one of the sections of pipe insulation and locate the  slit that runs the length of the insulation. 
6.  Spread the slit open at the base of the insulation and slip  it over the cold water (inlet) pipe. Apply gentle pressure 
along the length of the insulation to ensure that it is fully 
seated around the cold water pipe. Also ensure that the 
base of insulation is flush with the water heater. Once 
seated secure the insulation with duct tape, electrical 
tape, or equivalent.  Add additional sections of pipe 
insulation as needed.
7.  Repeat steps 5 and 6 for the hot water (outlet) pipe.
T&P Valve
T&P Valve
Drain Line Manual Relief Lever
T&P Insulation
Figure 14B 
T&P Valve Insulation 
Figure 14A  
Temperature and Pressure 
Relief Valve Installation
Drain Pan Temperature and
Pressure Relief Valve
Discharge line 3/4” Min.
Do not cap or plug.
6” Max.
Drain
Explosion Hazard
WARNING
•  Temperature-pressure relief valve must  comply with ANSI Z21.22-CSA 4.4 and 
ASME code.
•  Properly sized temperature-pressure  relief valve must be installed in opening 
provided.
•  Do not plug, block, or cap the discharge line.
•  Failure to follow this warning can result  in excessive tank pressure, serious 
injury or death.
For protection against excessive pressures and 
temperatures, a temperature and pressure relief valve must 
be installed in the opening marked “T & P RELIEF VALVE” 
(see Figure 14A.) This valve must be design certi fi ed by 
a nationally recognized testing laboratory that maintains 
periodic inspection of the production of listed equipment 
or materials as meeting the requirements for Relief 
Valves for Hot Water Supply Systems, ANSI Z21.22. The 
function of the temperature and pressure relief valve is to 
discharge water in large quantities in the event of excessive 
temperature or pressure developing in the water heater. 
The valve’s relief pressure must not exceed the working 
pressure of the water heater as stated on the data plate.
Temperature and Pressure 
Relief Valve 
						

							16
ELECTRICAL CONNECTIONS
Before plugging in the water heater, always make sure:
•  The voltage and frequency correspond to that specified on the water heater wiring diagram.
•  The electrical outlet has the proper overload fuse or  breaker protection.  IMPORTANT: Do not use an extension cord to connect the 
water heater to an electrical outlet.
•  The water heater and the outlet are properly grounded.
•  Installed in accordance with prevailing provisions of 
local codes, or in the absence of such, National Electric 
Code, ANSI/NFPA  70.
NOTE: Always reference the wiring diagram for the correct 
electrical connections. 
After making all electrical connections, completely fill the 
tank with water and check all connections for leaks. Open 
the nearest hot water faucet and let it run for 3 minutes to 
purge the water lines of air and sediment and to ensure 
complete filling of the tank. The electrical power may then 
be turned on. Verify proper operation after servicing.  
WIRING DIAGRAM
WARNING
Electric Shock Hazard
Disconnect power before 
servicing.
Replace all parts and panels 
before operating.
Failure to do so can result in 
death or electrical shock.
The Temperature and Pressure Relief Valve:
•  Shall not be in contact with any electrical part.
•  Shall be connected to an adequate discharge line.
•  Shall not be rated higher than the working pressure    
  shown on the data plate of the water heater.
The Discharge Line: 
•  Shall not be smaller than the pipe size of the relief    
  valve or have any reducing coupling installed in the    
 discharge line. •  Shall not be capped, blocked, plugged or contain any  
  valve between the relief valve and the end of the    
 discharge line.
•  Shall terminate a maximum of six inches above a  
fl oor drain or external to the building.  In cold climates, it 
is recommended that the discharge pipe be terminated 
at an adequate drain inside the building.
•  Shall be capable of withstanding 250°F (121°C)    
 without  distortion.
•  Shall be installed to allow complete drainage of both   
  the valve and discharge line.
WHITE BLACK
GREEN
GREEN
WHITE
BLACK
MOTOR
120V    60Hz.
120V 60Hz.TEMP.
SWITCH
BLUE
WHITE
WHITE/BLACK TRACER
YELLOW/BLACK TRACER
YELLOW
PRESSURESWITCH
YELLOW
GREEN
BLOWER GROUND
GAS VALVE CONNECTOR
Figure 14C 
						

							17
•  The domestic hot water line from the water heater 
should be vertical past any mixing valve or supply 
line to the air handler to remove air bubbles from the 
system. Otherwise, these bubbles will be trapped in the 
air handler heat exchanger coil, reducing the efficiency.
•  Do not connect the water heater to any system or    
  components previously used with non-potable water  
  heating appliances when used to supply potable water.
Some jurisdictions may require a backflow preventer in 
the incoming cold water line. This may cause the tem-
perature and pressure relief valve on the water heater to 
discharge or weep due to expansion of the heated water. A 
diaphragm-type expansion tank suitable for potable water 
will normally eliminate this weeping condition. Please read 
and follow the manufacturer’s instructions for the installa-
tion of such tanks.
Also see “Water System Piping” section for additional 
instructions on the proper installation and operation of this 
water heater.
Solar Installation
If this water heater is used as a solar storage heater 
or as a backup for the solar system, the water supply 
temperatures to the water heater tank may be in excess 
of 120°F.  A mixing valve or other temperature limiting 
valve must be installed in the water supply line to limit the 
supply temperature to 120°F. 
NOTE: Solar water heating systems can often supply water 
with temperatures exceeding 180°F and may result in 
water heater malfunction.
SPECIAL APPLICATIONS
Combination Space Heating/Potable Water System
Some water heater models are equipped with inlet/outlet 
tappings for use with space heating applications. 
Note: This water heater is suitable for combination water 
(potable) heating and space heating and not suitable for 
space heating applications only. If this water heater is to be 
used to supply both space heating and domestic potable 
(drinking) water, the instructions listed below must be followed.
•  Be sure to follow the manual(s) shipped with the air  handler system.
•  This water heater is not to be used as a replacement  for an existing boiler installation.
•  Do not use with piping that has been treated with  chromates, boiler seal or other chemicals and do not 
add any chemicals to the water heater piping.
•  If the space heating system requires water  temperatures in excess of 120°F, a mixing valve 
or an anti-scald device should be installed per its 
manufacturer’s instructions in the domestic (potable) 
hot water supply to limit the risk of scald injury.
•  Pumps, valves, piping and fittings must be compatible  with potable water.
•  A properly installed flow control valve is required to pre- vent thermosiphoning.  Thermosiphoning is the result of 
a continuous flow of water through the air handler circuit 
during the off cycle. Weeping (blow off) of the temperature 
and pressure relief valve (T & P) or higher than normal 
water temperatures are the first signs of thermosiphoning.
IN 
REMOVE A
MUST BE VERTICAL TO
IR BUBBLES
E
OUT  COIL
AIR
HANDLER 
TO
AIR
HANDLER
SHUT-OFF VA LV E  
*
EXPANSION TANK
VACUUM 
RELIEF
VALVE
COLD WATER INLET
VA
FLOW CONTROL 
LV
 PUMP 
* 
SHUT-OFFCHECK VALVE † 
(1/8” HOLE 
DRILLED IN CLAPPER)VALVECHECK 
 VALVE † 
TEMP/
PRESSURE
RELIEF
VA LV E
TEMPERED WATER
TO FIXTURES
(MUST MEET TEMPS LISTED 
IN MASS. CODE 248 CMR 
† )
MIXING VALVE
(MUST BE INSTALLED BELOW 
TOP OF WATER HEATER
AS PER MANUFACTURER’S 
RECOMMENDATIONS)
UNIONUNION
HOT 
WATER OUT
*   MASSACHUSETTS INSTALLATION REQUIREMENTS: 
  1.)   CONNECT ELECTRONICALLY-CONTROLLED TIMER TO AN ALL-BRONZE PUMP.  PUMP MUS\
T ACTIVATE EVERY 6 HOURS FOR 60 SECONDS.     TURN PUMP TIMER OFF BEFORE CLOSING PIPING LOOP SHUT-OFF VALVE.  
  2.)   ALL WATER PIPING MUST BE INSTALLED AND INSULATED IN ACCORDANCE WITH MASS\
ACHUSETTS CODE (248 CMR & 780 CMR).  
  3.)   PIPING LOOP BETWEEN WATER HEATER AND AIR HANDLER MUST BE INSTALLED IN CO\
MPLIANCE WITH 248 CMR.   
†  REQUIRED FOR MASSACHUSETTS.
‡  PIPING FROM THE TOP OF THE WATER HEATER WITH TEES IS ACCEPTABLE. WATER HEATER ACCEPTED 
BY THE BOARD FOR 
INSTALLATION IN 
MASSACHUSETTS. 
†50 FT. MAX. DEVELOPED 
DISTANCE FROM WATER 
HEATER TO FAN COIL 
†
SEE 
NOTE ‡GAS WATER  HEATER
Figure 14DTYPICAL MIXING VALVE INSTALLATION
COMBINATION SPACE HEATING/POTABLE
WATER HEATING SYSTEM 
						

							18
INSTALLATION CHECKLIST
Water Heater Location
•  Centrally located with the water piping system.    
  Located as close to the gas piping and vent pipe    
  system as possible.
•  Located indoors and in a vertical position. Protected   
from freezing temperatures.
•  Proper clearances from combustible surfaces    
  maintained and not installed directly on a carpeted    
 fl oor.
•  Provisions made to protect the area from      
  water damage. Drain pan installed and piped to an    
 adequate drain.
•  Installation area free of corrosive elements and    
  fl ammable materials.
• Suffi  cient room to service the water heater.
•  Water heater not located near an air-moving device.
Gas Supply and Piping
•  Gas supply is the same type as listed on the water    
  heater data plate.
•  Gas line equipped with shut-off valve, union, and     
 sediment trap.
•  Approved pipe joint compound used.
•  Adequate pipe size and of approved material.
•  Chloride-free soap and water solution or other    
  approved means used to check all connections and    
  fi ttings for possible gas leaks.
Combustion Air Supply/Vent Pipe System
•  Sufficient fresh air supply for proper water heater 
 operation.
•  Fresh air not taken from areas that contain negative 
pressure producing devices such as exhaust fans, 
fi replaces, etc.
•  Fresh air supply free of corrosive elements and  flammable vapors.
•  Fresh air openings sized correctly with consideration  
  given to the blocking effect of louvers and grilles.
•  Ductwork is the same cross-sectional area as the    
 openings. 
•  Vent pipe and fittings of approved material.  •  Acceptable size, length, and number of elbows on    
  exhaust outlet pipe.
•  Installed in accordance with prevailing provisions of
  local codes, or in the absence of such, National Fuel  
  Gas Code, NFPA 54, ANSI Z223.1-Current edition.
•  Slope 2” & 3”  horizontal piping at a downward pitch  
  of 1/8” per 5ft. away from the water heater.  See    
 Figure 10.
•  Not obstructed in any way.
Vent Termination 
Horizontal
•  12” Min. above grade/snow level.
•  Slope 2” & 3”  horizontal piping at a downward pitch  
  of 1/8” per 5ft. away from the water heater.  See    
 Figure 10. 
•  Away from corners, other vents, windows, etc.
Vertical
•  Outlet - 12” Min. above roof/snow level.
Water System Piping
•  Temperature and pressure relief valve properly    
  installed with a discharge line run to an      
  open drain and protected from freezing.
•  All piping properly installed and free of leaks.
• Heater completely  fi lled with water.
•  Closed system pressure build-up precautions    
 installed.
•  Mixing valve installed per manufacturer’s      
 instructions.
Electrical Connections
•  Unit connected to a dedicated power supply.
•  Unit connected to a 120V electrical supply.
• Proper polarity.
•  Water heater properly grounded.
•  Installed in accordance with prevailing provisions of lo- cal codes, or in the absence of such, the current edition 
of the National Electric Code, ANSI/NFPA 70. 
						

							19
OPERATING YOUR WATER HEATER
Lighting Instructions
Read and understand these directions thoroughly before 
attempting to operate the water heater. Make sure the 
tank is completely filled with water before operating the 
water heater. Check the data plate near the gas control 
valve/thermostat for the correct gas. Do not use this 
water heater with any gas other than the one listed on 
the data plate. If you have any questions or doubts, 
consult your gas supplier or gas utility company.Explosion Hazard
Replace viewport if glass is 
missing or damaged.
Failure to do so can result in 
death, explosion or fire.
WARNING
FOR YOUR SAFETY READ BEFORE LIGHTING
OPERATING INSTRUCTIONS
TO TURN OFF GAS TO APPLIANCE
1.   STOP! Read the safety information 
  above on this label.
2.  Connect to a grounded 110/120 volt power  supply.
3.  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. 4.  This appliance is equipped with a device which 
automatically lights the burner.
  DO NOT TRY TO LIGHT THE BURNER BY HAND.
5.  Wait five minutes to clear out any gas. If you then 
smell gas. STOP! Follow the “B” in the safety 
information above on this label. If you don’t smell 
gas, go to the next step.
6.  Set the thermostat to the desired setting by first 
pressing the COOLER           and HOTTER  
buttons  together and holding for 1 second. Then 
press the HOTTER           button.
7.   WATER TEMPERATURE ADJUSTMENT   is approximately 120°F.
CAUTION: Hotter water increases the risk of scald injury. Consult the instruction manual before 
changing the temperature.
8.  If the appliance will not operate, follow the  instructions “TO TURN OFF GAS APPLIANCE” 
and call a qualified person or gas supplier.
WARNING: TURN OFF ALL ELECTRIC POWER 
BEFORE SERVICING.
1.  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. 2.  Unplug electrical service to the appliance if 
service is to be performed.
WARNING: If you do not follow these instructions exactly, a fire or explosion 
may result causing property damage, personal injury or loss of life.
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 LIGHTING smell all around the appliance area 
for gas. Be sure to smell next to the floor because some 
gas is heavier than air and will settle on the floor.
 WHAT TO DO IF YOU SMELL GAS: •  Do not try to light any appliance.
•  Do not touch any electrical switch; do not use any 
phone in your building.
•  Immediately call your gas supplier from a  neighbor’s phone. Follow the gas supplier’s 
instructions.  •  If you cannot reach your gas supplier, call 
the fire department.
C.  Do not use this appliance if any part has been  under water. Immediately call a qualified service 
technician to inspect the appliance. Water heaters 
subjected to flood conditions or anytime the gas 
controls, main burner or pilot have been 
submerged in water require replacement of the 
entire water heater. 
						

							20
Water temperature over 125°F can cause 
severe burns instantly or death from scalds.
Children, disabled and elderly are at highest 
risk of being scalded.
Feel water before bathing or showering.
Temperature limiting valves are available.
WARNING
Water Heater Operation
Figure 15 below shows the water heater’s sequence of 
operation when a call for heat is initiated. The ignition con-
trol module will attempt to light the burner three times. If 
the ignition control does not detect ignition it will enter lock-
out mode, indicated by a three flash error code. 
Burner Flames
Inspect the burner flames through the viewport. Flames 
should be very small with a blue haze and small amounts 
of yellow or orange at the edges. After several minutes 
of operation, the burner screen may glow red. If large 
flames are observed at any time, shut-off unit and call a 
qualified person.
Figure 16
Flame CharacteristicsCorrect flamesoft blue
Water Temperature RegulationDue to the nature of the typical gas water heater, the water 
temperature in certain situations may vary up to 30°F (16.7 
°C) higher or lower at the point of use such as, bathtubs, 
showers, sink, etc. 
HOTTER WATER CAN SCALD: Water heaters are intended 
to produce hot water.  Water heated to a temperature which 
will satisfy space heating, clothes washing, dish washing, and 
other sanitizing needs can scald and permanently injure you 
upon contact.  Some people are more likely to be permanently 
injured by hot water than others.  These include the elderly, 
children, the infi  rm, or physically/mentally handicapped. If 
anyone using hot water in your home  fi ts into one of these 
groups or if there is a local code or state law requiring a certain 
temperature water at the hot water tap, then you must take 
special precautions.  In addition to using the lowest possible 
temperature setting that satis fi es your hot water needs, a 
means such as a mixing valve should be used at the hot 
water taps used by these people or at the water heater.   
Mixing valves are available at plumbing supply or hardware stores, 
see Figure 13.  Follow manufacturer’s instructions for installation of 
the valves.  Before changing the factory setting on the thermostat,  see Figure 17 and the table below. Using the lowest hot water 
temperature that meets your needs will also provide the most 
energy effi
 cient operation of the water heater.
Never allow small children to use a hot water tap, or to draw 
their own bath water. Never leave a child or handicapped 
person unattended in a bathtub or shower.
Ta b l e  5 :
Water 
Temperature °F Time for 1st 
Degree Burn  
(Less Severe Burns) Time for 
Permanent Burns 
2nd & 3rd Degree  (Most Severe Burns)
11 0
11 6
11 6
122
131
140
149
154 (normal shower temp.)
(pain threshold) 35 minutes1 minute
5 seconds
2 seconds 1 second
instantaneous 45 minutes
5 minutes
25 seconds 5 seconds
2 seconds
1 second
(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15,1978)
NOTE:  A water temperature range of 120°F-140°F (49°C-60°C) 
is recommended by most dishwasher manufacturers.
The thermostat of this water heater has been factory set at its 
lowest position to reduce the risk of scald injury. It is adjustable 
and must be reset to the desired temperature setting.
The mark (  
 ) (on temperature setting of gas control valve/
thermostat) indicative of approximately 120°F is preferred 
starting point. Some states have a requirement for a lower 
setting. If you need hotter water, follow directions for 
temperature adjustment, but beware of the warnings in this 
section.
Pressing the “COOLER” 
 button decreases temperature and 
pressing the “HOTTER” 
 button increases the temperature.
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 “COOLER” and “HOTTER” temperature adjust-
ment buttons at the same time for one second (See 
Figure 17). One or two of the temperature indicators 
will light up. These indicators will only remain on for 
Figure 15  
Sequence of Operation
CALL FOR
HEAT INDICATED BY FAST FLASH OF LED
CONTROL CHECKS TO ENSURE 
PRESSURE SWITCH IS OPEN
DRAFT INDUCER IS ENERGIZED
 
CONTROL ENERGIZES HOT 
SURFACE IGNITER (HSI)
CONTROL ENERGIZES MAIN 
GAS VALVE ALLOWING THE 
BURNER TO BE LIT BY HSI
WATER IN TANK IS HEATED BY MAIN BURNER AND 
TEMPERATURE REACHES 
THERMOSTAT SETTING
FLAME SENSE ROD DETECTS 
FLAME OF MAIN BURNER
MAIN VALVE DE-ENERGIZES 
AND BLOWER CONTINUES FOR 
A POST PURGE TIME OF 
APPROX. 30 SECONDS 
MAIN VALVE DE-ENERGIZES 
AND BLOWER CONTINUES FOR 
A POST PURGE TIME OF  
APPROX. 5 SECONDS
HEATER RETURNS TO STANDBY MODE
CONTROL CHECKS TO  ENSURE 
PRESSURE SWITCH  CLOSES, 
INDICATING BLOWER OPERATING  
AND THERE ARE NO VENTING 
BLOCKAGES (INLET OR OUTLET)