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

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CERTIFIED GAS 
SUPPLY FLEX PIPE 
(PROPERLY SIZED 
FOR THE HEATER 
INPUT RATE)
SEDIMENT 
TRAPGAS 
CONTROL 
VA LV E GROUND 
JOINT 
UNION 
(OPTIONAL)
CAP
3” 
MIN.
Figure 13 
BLACK PIPE
SEDIMENT 
TRAPGAS 
CONTROL 
VA LV E GROUND 
JOINT 
UNION 
(OPTIONAL)
CAP
  3”  MIN.
Figure 14 
 SEDIMENT  TRAP
• Contaminants in gas lines can 
cause fire or explosion.
• Clean all gas piping before 
installation.
• Install sediment trap in accor-
dance with NFPA54.Fire and...

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 VENTING
This direct vent water heater uses a sealed venting 
system to supply fresh combustion air to the heater and 
to exhaust the products of combustion (fl ue gases) to the 
outdoors. The venting is a “pipe in a pipe” system. The 
inner (3”) piping carries out the exhaust fl ue gases while 
the outer (6”) piping carries in fresh combustion air. The 
corrugated end of the vent piping connects to the top of 
the water heater and the opposite end connects to...

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FRESH 
COMBUSTION 
AIR IN
HOT 
EXHAUST 
GAS OUT
SCREW
Figure 16 
Be sure venting is properly connected to prevent escape 
of dangerous flue gases which could cause deadly 
asphyxiation.
 DV TERMINATION SAFETY COVER
When the heater is in operation the vent termination hood 
will be hot (see Figure 16).
A Safety cover (see Figure 17) is available to prevent 
accidental contact with the vent terminal. Contact your 
Customer Service Department for ordering...

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 VENT  ASSEMBLY
The vent piping and the vent termination hood are to be 
connected as shown in Figure 20.
Maintain vent clearances to combustibles as shown in 
Figure 21.
Depending on your access to where the vent termination 
passes through the wall, you may wish to connect the 
piping and vent termination hood together fi rst.
Inside the vent piping there are springs that hold the two 
corrugated pipes in position. When the pipes are stretched 
to the required...

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INNER 
CORRUGATED 
PIPEOUTER 
CORRUGATED PIPE
RESTRICTER 
PLATEFLUE TUBE 
REDUCER
APPLY 
SILICONE
Figure 23 
 VENT CONNECTION TO THE WATER HEATER
Bend both the corrugated pipes toward the fl ue connection 
on the water heater. Pull and connect the inner corrugated 
pipe to the water heater’s fl ue tube reducer with hi-temp 
red silicone (included) and gear clamp. Make sure this 
connection is tight and leak proof (see Figure 24).
*The sealant between the inner...

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ABOVE 
ANTICIPATED 
SNOW 
LEVEL OR 
  12”  ABOVE 
GRADE
A
B
Low Vent installation
7
6
8
1
C
519
Figure 28 
DIM. 4038 5040 5047
A 80”  MAX.
B 9”  MIN.
C 
(RECOMMENDED)  63.63”  73.00”  74.00” 
C 
(MINIMUM)  60.75  69.50  70.50 
D 14.25”  MIN.
NOTE: Dimension “C” is the height above to fl oor to the center of the 
termination hole through the exterior wall.
D
4
Minimum Vent installation
C
ABOVE 
ANTICIPATED 
SNOW 
LEVEL OR 
  12”  ABOVE 
GRADE3
  9” 
Figure 29...

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 INSTALLATION  CHECKLIST
Note: Use and complete this checklist before lighting the 
heater. Correct any conditions that do not meet these 
instructions.
 Water Heater Location
  Centrally located with the water piping system. 
Located as close to 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...

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LIGHTING INSTRUCTIONS
1.  Turn the gas control/temperature knob counterclockwise        to the OFF position. The status light will stop 
blinking and stay on for a short time after the water heater is turned off. See Figure ‘A’.
329352-000
TO TURN OFF GAS TO APPLIANCE
1.  STOP! It is imperative that you read all safety warnings before lighting the pilot.
2.  Turn the gas control/temperature knob counterclockwise        to the OFF position.
3.  Wait ten (10)...

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TEMPERATURE REGULATION
 TEMPERATURE  REGULATION
 
 Temperature  Adjustment
Valves for reducing the point-of-use temperature by mixing 
cold and hot water are available (see Figure 8). Also 
available are inexpensive devices that attach to faucets to 
limit hot water temperatures. Contact a licensed plumber 
or the local plumbing authority.
Note: During low demand periods, a lower thermostat 
setting will reduce energy losses and may satisfy your 
normal hot...

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FOR YOUR INFORMATION
 EXTERNAL  DAMAGE
Do not operate the water heater until it has been fully 
checked out by a qualifi ed technician, if the water heater:
• Has been exposed to fi re or damage.
• Displays evidence of sooting.
• Produces steam or unusually hot water.
If the water heater has been fl ooded it must be replaced.
 START UP CONDITIONS
NEVER OPERATE THE HEATER WITHOUT FIRST 
BEING CERTAIN IT IS FILLED WITH WATER AND A 
TEMPERATURE AND PRESSURE RELIEF...