Rheem Guardian PowerVent Training Manual page 15

Guardian PowerVent Training Manual
Main valve on gas valve
opens.
You will have 120V at the
blue #6 main valve wire.
Main burner ignition.
The flame rectification
circuit is constantly "ON"
during pilot and main
burner. If the control
module thinks flame is
suppose to be present, then
the circuit constantly
'looks' for the presence of
flame.
Water heats to thermostat
setting.
(4th Safety)
Blower motor thermal
safety switch is monitoring
venting temperatures.
Flammable Vapor (FV)
sensor is monitoring.
The "trial for ignition" will
last for 75 seconds. If the
control is not able to
establish a pilot flame, it will
initiate the inter-purge. This
is a 30 second purge without
spark or gas to clear the
combustion chamber. Then
the unit will retry for
ignition. The unit will try 3
times total for ignition. If
ignition fails, it will initiate a
post-purge (30 seconds) to
clear the combustion
chamber; then go into
lockout. LED flashes 1/1.
Check for 120V power to the
main valve (blue wire) side
of the gas valve.
If the unit rectifies flame for
at least 10 seconds, the
internal counter resets to
zero.
If the flame is established
and then lost, the control will
turn off the main and pilot
valve, execute an inter-purge
(30 seconds) and then start a
new trial for ignition
sequence.
ECO is monitoring water
temperature.
Blower motor thermal safety
switch set to 180°F with
automatic reset.
FV Sensor is monitoring
local environment for
presence of flammable
vapors
SVC900; Rev 1
Page 14