American Water Heater 40 Gallon 36000 BTU UltraLow Nox Direct Vent Natural Gas Water Heater DVUG6240S36NV user manual

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Do not store or use gasoline or other 
flammable vapors and liquids in the 
vicinity of this or any other appliance.
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.
Installation and service must be...

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Table Of Contents
Water Heater Safety .............................................................................. 1-3
Installing Your Gas Water Heater ........................................................ 4-16
  Unpacking the Water Heater ........................................................... 4
 Location Requirements ................................................................ 5-6
 Gas Supply .................................................................................. 7-8...

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For all side wall terminated, horizontally vented power vent, direct vent, and power direct vent gas fueled water heaters 
installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or 
operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished 
grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satis-
fied:...

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INSTALLING YOUR GAS WATER HEATER
Important Information About 
This Water Heater
This gas water heater was manufactured to voluntary 
safety standards to reduce the likelihood of a flammable 
vapor ignition incident. New technology used in meeting 
these standards makes this product more sensitive to  
installation errors or improper installation environments.  
Please review the Installation Checklist found at the end of 
the installation instructions section and make any required 
installation...

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Location Requirements
This water heater design has been tested by CSA 
International and complies with ANSI Z21.10.1, Section 
2.35 Flammable Vapors Resistance. Therefore this water 
heater does not need to be installed 18 inches above the 
floor unless specifically required by state or local codes. 
The water heater  must be located or protected to avoid 
physical damage by vehicles or flooding.
Do not use or store flammable products such as gasoline, 
solvents, or adhesives in the same room or area...

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IMPORTANT: The water heater should be located 
in an area where leakage of the tank or connections 
will not result in damage to the area adjacent to the 
water heater or to lower floors of the structure. Due 
to the normal corrosive action of the water, the tank 
will eventually leak after an extended period of time. 
Also any external plumbing leak, including those from 
improper installation, may cause early failure of the tank 
due to corrosion if not repaired.  If the homeowner is 
uncomfortable...

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Gas Supply
Gas Requirements
IMPORTANT: Read the data plate to be sure the water 
heater is made for the type of gas you will be using in 
your home. This information will be found on the data 
plate located near the gas control valve/thermostat. If the 
information does not agree with the type of gas available, 
do not install or light. Call your dealer.
NOTE: An odorant is added by the gas supplier to the gas 
used by this water heater. This odorant may fade over an 
extended period of time. Do not...

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Combustion Air Supply and 
Ventilation
IMPORTANT:  Air for combustion and ventilation must 
not come from a corrosive atmosphere. Any failure due 
to corrosive elements in the atmosphere is excluded from 
warranty coverage.
IMPORTANT:  Do not common vent this water heater with 
any power vented appliance.
Vent Pipe System
This is a direct vent water heater which draws its 
combustion air from outside of the structure and exhausts 
all products of combustion to the outside of the structure.
Carbon...

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Optional through the Wall Venting
1.  Make sure a proper location has been selected for the   
water heater installation.  Consider the following:
•   Water piping
•   Gas Piping
•    Access for service
•    Proper clearance for combustibles
•    Drainage for the temperature and pressure 
relief valve and drain pan.
•    Vent cap termination
2.  Determine the “A” dimension for your specific water 
heater by referencing figure 4B.  Cut a 6 inch opening 
through the  wall in the location as shown....

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“B”
“A”
Figure 4B
Optional Installation
NOTE:
1. Dim. “A” measured from center of cutout to bottom of heater.
2. Dim. “B” measured from center of heater to outside of wall.
3” Elbow
Screws 
& 
Sealant
   1
   2
5” Pipe
3” Elbow
Inside Cover 
Plate
Screws 
& Sealant
Figure 5
Vertical Installation
4.  Extend the 3” telescoping pipe to its maximum length.   
Place the smaller section onto the 3” elbow at least 1 
and 1/2 inches (See Figure 6).  Drill two holes 180° 
apart and secure with the two #8 sheet...