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If the flame flutters or is blown out, combustion products are escaping
from the relief opening. If this occurs, do not operate the water heater
until proper adjustments or repairs are made to the vent pipe system
and/or air supply requirements.
Checking the Draft
WARNING
Burn Hazard
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 30). Make sure all other appliances in the
area are operating and all doors/windows are closed when
performing the draft test. Pass a match flame or smoke around
the relief opening of the draft hood. A steady flame or smoke
drawn into the opening indicates proper draft.
Water Heater Operation
Figure 29 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 38 and/or status
code 8 page 39).
Flue Products Vented
to Ouside of Building
Draft Hood
Dilution Air
Air is drawn in for
combustion. Keep
area clean and free
from combustibles
and flammable vapors.
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.
Dilution Air
(Relief Opening)
Dilution Air
Match
Outer Door
Floor Drain
6” Maximum
Air Gap
FIGURE 30.
FIGURE 29.
SEQUENCE OF OPERATION
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 is de-
energized and air intake fan
continues for a post purge time
of approximately 5 seconds.
Water heater returns to standby
mode.
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 will do a
relay check (relay clicks will be
heard).
Display will show temperature
set point during call for heat.
Gas valve/thermostat will open
for 4 second trial for ignition
and fan will turn on.
Call for heat indicated by
flashing of display screen
status codes.
Draft Blower is energized.