American Water Heater 40 Gallon 38000 BTU Direct Vent Natural Gas Water Heater DVG6240S38NOV user manual

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LOCATING THE NEW WATER HEATER
 
 FACTS TO CONSIDER ABOUT THE LOCATION
Carefully choose an indoor location for the new water 
heater because the placement is a very important 
consideration for the safety of the occupants in the building 
and for the most economical use of the appliance. This 
water heater is not for use in manufactured (mobile) homes 
or outdoor installation.
Whether replacing an old water heater or putting the water 
heater in a new...

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 AIR  REQUIREMENTS
For safe operation an adequate supply of fresh, 
uncontaminated air must be provided for combustion.
This gas-fi red water heater is a direct vent model. It 
connects directly to the outside of the building through 
the vent termination hood. The hood operates as both 
the combustion air intake and the heater exhaust port 
(see Figure 16).
All combustion air is obtained from outside the building 
through this hood. Ensure the area around the...

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FLAMMABLE
Do not store or use gasoline or other flammable vapors and 
liquids in the vicinity of this or any other appliance.  Storage or 
use of gasoline or other flammable vapors or liquids in the 
vicinity of this or any other appliance can result in serious injury 
or death.
Can result in serious injury or deathFIRE AND EXPLOSION HAZARD
Flammable VaporsFLAMMABLES
WARNING
For continued protection against 
risk of fire:
• Do not install water heater on...

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 WATER  PIPING
 Water  Pressure
The water supply pressure should not exceed 80 psi. If this 
occurs, a pressure reducing valve with a bypass should 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. See also “Closed Water 
Systems” and “Thermal Expansion” sections.
 Mixing  Valves
HOT WATER CAN SCALD:
Water heaters are intended to heat water. Water...

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INSTALLING THE NEW WATER HEATER
 WATER PIPING INSTALLATION
Note: Water piping and vent piping occupy the space 
above the water heater. Plan the water piping to ensure 
it does not cause interference with the vent piping (see 
“Venting”).
• 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...

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A properly-sized and charged thermal expansion tank must 
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.
Note: To protect against untimely corrosion of hot and cold 
water fi ttings, it is recommended that di-electric unions or 
couplings be installed on this water heater when connected 
to copper pipe.
•...

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The T&P valve must be manually operated at least once 
a year. Caution should be taken to ensure
1.  no one is in front of or around the outlet of the 
discharge line, and
2.  the water manually discharged will not cause any 
bodily injury or property damage because the water 
may be extremely hot.
If after manually operating the valve, it fails to completely 
reset and continues to release water, immediately close 
the cold water inlet to the water heater,...

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 SPACE HEATING AND POTABLE WATER SYSTEMS
This appliance has been design certifi ed as complying 
with American National Standard/CSA Standard for water 
heaters and are considered suitable for Water (Potable) 
Heating and Space Heating. Note: This water heater 
may be used in combination potable water/space heating 
system. Do not use in a space heating only application.
Toxic Chemical Hazard
WARNING
• Do not connect to non-potable water system.
Note: Ensure the...

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 COMBO  HEATING
This section serves as a guide for the installation and use 
of “Combo” heating systems utilizing a domestic water 
heater that has been specifi cally approved for such use. 
It is written for those knowledgeable in the required trades 
and professionals involved in the design and installation 
of Combo Heating Systems.
It is the responsibility of the installer/designer to follow all 
applicable codes to ensure the effectiveness and safety 
of...

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 GAS  PIPING
• Do not use water heater with 
any gas other than the gas 
shown on the rating plate.
• Excessive pressure to gas 
control valve can cause serious 
injury or death.
• Turn off gas lines during 
installation.
• Contact qualified installer or 
service agency.Fire and Explosion Hazard
WARNING
Explosion Hazard
Have a qualified technician make sure that the L.P. 
gas operating pressure does not exceed 13 water 
column.
Failure to do so can result in...