Sequence Of Operation - Rheem GG50T06PVT Use And Care Manual

Sequence of Operation...

1. During initial start-up or a call
for heat, the control will verify the
vacuum switch is open.
2. 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).
3. 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.
4. The control will then proceed
through a sequence of self-
diagnostics before initiating a trial
for ignition.
5. During the trial for ignition, the
pilot will spark in an attempt to
light the pilot. Once the pilot flame
is established, the main gas valve
will open allowing gas to flow to the
main burner.
6. The main burner and pilot will
remain lit throughout the heat
cycle until the water temperature
setting is reached.
7. Once the water temperature
setting is reached, the control will
close the main gas valve and pilot
valve which will extinguish both the
main burner and pilot burner flames.
8. 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.
9. 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 "WARNING" on page 3 for
additional information.
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