Fig. 34
6.
Turn temperature knob to call for heat.
7.
Verify thermostat cycle light on the front panel
turns on and burner lights.
A.
If thermostat cycle light and burner come on
but turn off within 10 seconds, perform
THERMOCOUPLE TEST.
NOTE:
Temperature controller will de-energize
internal relay if the circuitry detects an open
thermocouple and the thermostat cycle light will
display a blink code.
B.
If thermostat cycle light and burner do
not
come on, verify internal relay contact
operation. Check for 120VAC at terminals 1
& 2 on gas solenoid valve. If voltage is not
present, install a replacement temperature
controller and perform TEMPERATURE
CONTROLLER CALIBRATION.
IGNITION MODULE TEST
NOTE:
Igntion module has 10 second ignition trial
time, 5 second inter-purge (delay) before retry and will
attempt to light pilot 7 times then lockout if
unsuccessful.
1.
Cycle the power switch and set temperature knob
to call for heat.
2.
Ignition module is energized and ignition cycle
starts. Observe ignition module LED thru front
panel sight glass.
A.
If LED is Red and blinking an error code,
there may be a problem with pilot burner,
flame sense or ignition module. To identify
error code, refer to IGNITION MODULE -
LED DIAGNOSTICS AND OPERATING
STATUS .
B.
LED is Green and blinking during ignition
trial and inter-purge. LED then turns to solid
Green when pilot flame is established (flame
is sensed).
Fig. 35
3.
Pilot solenoid valve energized by pilot valve
output from ignition module (pin 2) allowing gas
flow to the pilot burner. Ignition module generates
spark voltage and ignitor begins sparking. If there
is no spark then check the following.
A.
Check for 120VAC at ignition module pin 3
(NEUTRAL) and pin 4 (120V).
B.
Inspect ignitor cable for damage and
continuity.
C.
Verify spark gap is set at 1/8".
D.
If component passes the above tests and is
not sparking, then replace ignition module.
4.
Pilot burner lights and flame is sensed. If
electrode continues to spark after pilot is lit then
check the following.
A.
On models with Radiant burner, verify the
electrode is fully engulfed by pilot flame.
B.
Verify ground wire (pin 1) from ignition
module is securely grounded to chassis.
5.
As long as the ignition module is sensing flame
current, then the pilot will stay lit.
VCCG Series Heavy Duty Gas Griddle - SERVICE PROCEDURES AND ADJUSTMENTS
F45533 (1014)
Page 18 of 26
