Rheem Guardian PowerVent - Pilot Flame Ignition

Guardian PowerVent Training Manual SVC900; Rev 1
Page 13
(2nd Safety)
Control turns on blower
motor. This creates enough
venting to close the vacuum
safety switch.
Blower is in pre-purge stage
for about 15 seconds.
You will have 120V at the
yellow (#5-blower motor)
wire. If you hear spark, then
there is 120V power at the
yellow #5 location.
In normal operation, the
control checks for a closed
vacuum switch within 12
seconds before starting the
pre-purge time. The vacuum
switch measures the vacuum
created by the blower and
verifies the blower is
operating at speed. The
control attempts to close the
switch by cycling (turning
off blower, then on) the
blower motor. After 5 cycles
(attempts), the control will
lockout. LED flashed 3/3.
Ignition attempt
Spark ignitor begins to
spark. (Orange wire)
120V voltage opens pilot
vein of gas valve.
You will have 120V at the
yellow #7 pilot valve wire.
Listen for spark ignitor.
Visually verify spark at the
pilot electrode.
Check to make sure the
valve is turned ON.
Check for voltage to the pilot
valve yellow #7 wire
connection.
Visually verify pilot flame is
present.
(3rd Safety)
Flame is rectified.
Pilot lights.
After pilot flame has been
recognized (rectified), the
spark will stop
Main valve is energized.
Note: There is always a
flame rectification circuit
check while the main burner
is operating. When the main
burner fails, the unit will
recycle and attempt ignition.