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29
Sequence of Operation
During initial start-up or a call for heat, the
control will verify the vacuum switch is
open.
Once the control verifies the blower vacuum
switch is open, the control will energize the
blower motor for the pre-purge sequence
(approximately 5 seconds).
The control will verify the blower vacuum
switch has closed, ensuring that the blower
is functioning properly and that the venting
system is not blocked.
The control will then proceed through a
sequence of self-diagnostics before initiating
a trial for ignition.
During the trial for ignition, the hot surface
ignitor will warm up.
Once the hot surface ignitor warms up, the
main gas control (thermostat) will open
allowing gas to flow to the main burner.
Once the main burner ignites, the control
will verify that the burner flame is present
through the flame sense circuit. The hot
surface ignitor will then turn off.
The main burner will remain lit throughout
the heat cycle until the water temperature
setting is reached.
Once the water temperature setting is
reached, the control will close the main gas
control (thermostat) which will extinguish
the main burner flames.
The blower motor will stay energized for
an additional 30 seconds after the control
verifies that the burner flame is extinguished
in order to clear combustion gases from the
water heater.
After the post-purge sequence, the control
will de-energize the blower motor and go
into a stand-by mode awaiting the next call
for heat.
This water heater is equipped with a
flammable vapor sensor that is monitored
continuously by the electronic control in all
modes of operation.
In the event that flammable vapors are
detected, the control will automatically shut
down the water heater and prevent the water
heater from being started again.
The following is a list of materials that will
cause the Flammable Vapor Sensor to shut
down the water heater.
Vapors of Gasoline.
Vapors of certain flammable paints,
stains, and thinners.
Vapors of vent pipe Cement & Solvents.
Bleach (direct contact with flammable
vapor sensor).
Some other flammable materials and their
vapors.
If the flammable vapor sensor shuts down
the water heater, then the electronic control
will display the appropriate error code
and you should then promptly contact a
qualified service technician.
Refer to the “NOTICE” on page 3 for
additional information.
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