Checking The Draft; Water Heater Operation - Whirlpool Gas Water Heater High Efficiency Atmospheric Vent Installation Instructions And Use & Care Manual

Gas water heater high efficiency atmospheric vent
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Water Heater Operation

Figure 17 below shows the water heater's sequence of
operation when a call for heat is initiated. The ignition
control module will attempt to light the burner three times.
If the ignition control does not detect ignition it will enter
lockout mode, indicated by display flashing status code
(see status code 3 page 28 and/or status code 9 page 29).
Call for heat indicated by
flashing of display screen
status codes.
Gas valve/thermostat will do a
relay check (relay clicks will be
Display will show temperature
set point during call for heat.
Draft Blower is energized.
System will verify pressure
switch operation and start a
5 second pre-purge, then air
intake fan will turn off.
Ignitor will start a 12 second
warm up period. "IGN" will
show on display.
Gas valve/thermostat will open
for 4 second trial for ignition
and fan will turn on.
Main burner flame is detected by
flame sense rod. Air intake fan
and main burner will continue to
operate until water temperature
inside the tank reaches
temperature set point.
Gas valve/thermostat is de-
energized and air intake fan
continues for a post purge time
of approximately 5 seconds.
Water heater returns to standby

Checking The Draft

Do not touch vent.
Doing so can result in burns.
After successfully lighting the water heater, allow the unit
to operate for 15 minutes and check the draft hood relief
opening for proper draft (Figure 18). Make sure all other
appliances in the area are operating and all doors are closed
when performing the draft test. Pass a match flame around
the relief opening of the draft hood. A steady flame drawn
into the opening indicates proper draft.
Flue Products Vented
to Ouside of Building
Dilution Air
Draft Hood
Dilution Air
(Relief Opening)
The water heater must be installed according to all local and state
codes or in the adsence of local and state codes, the "National Fuel
Code"' ANSI Z223.1(NFPA 54)- current edition.
Burn Hazard
Dilution Air
Air is drawn in for
combustion. Keep
area clean and free
from combustibles
and flammable vapors.
Outer Door
6" Maximum
Air Gap
Floor Drain

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