Electronic Ignition System; Flame Sense Current Check - Vulcan-Hart GRC35 Service Manual

GR SERIES GAS FRYERS - SERVICE PROCEDURES AND ADJUSTMENTS
A. If the average temperature reading is within
tolerance, cooking control is properly calibrated.
B. If the average temperature reading is out of
tolerance, perform the following:
1) Solid State Control - Adjust the offset
temperature accordingly as outlined in "SOLID
STATE CONTROL" under "SERVICE
PROCEDURES" and "ADJUSTMENTS".
2) Computer Control - Adjust the offset
temperature accordingly as outlined in
"COMPUTER CONTROL" under "SERVICE
PROCEDURES" and "ADJUSTMENTS".
C. Allow the fryer to cycle twice and calculate the
average temperature.
8. If the above adjustment can not be obtained, check
the temperature probe as outlined under
"TEMPERATURE PROBE TEST".

ELECTRONIC IGNITION SYSTEM

Operation
When the main power switch is turned on the ignition
control module is energized with 24 volts between
terminals 5 and 6.
An output of 24 volts is sent from terminals 2 and 3 to
the pilot coil on the combination valve, allowing gas flow
to the pilot; and spark voltage is sent from terminal 9 to
begin sparking at the ignitor/flame sense electrode. The
sparking will continue until an adequate pilot flame is
sensed or for a maximum of 90 seconds.
If pilot ignition is not established within the first several
seconds of ignition trial time, the cooking control
displays a message indicating "pilot out" or "ignition
failure" as the ignition module continues to generate a
spark at the ignitor/flame sense electrode.
If pilot is not established within the 90 second ignition
trial time, the ignition module locks out power to the gas
valve. A message is displayed by the control indicating
"ignition lockout"; keypad is disabled and the electronic
alarm will sound continuously.
The system remains locked out until the power switch is
cycled to reset the system and re-start the ignition trial
cycle.
F-25114 Rev.A (07-03)
Once the pilot flame is confirmed, a 24 volt output from
terminal 1 will provide the ignition status input signal to
the cooking control. When the cooking control calls for
heat, the heat output is activated and power is applied to
the heat control Triac on the Control Interface Board.
With the Triac powered, the main valve coil on the
combination valve is then energized, allowing gas flow
to the burners.
Terminal
1
2
3
4
5
6
9

FLAME SENSE CURRENT CHECK

1. Turn the power switch off.
2. Access the ignition control module in the power
supply box.
3. Remove the jumper wire between terminals marked
with an asterisk (*) & 8.
– 20 –
Description
MV (main voltage) - 24VAC
output will be present, providing
the ignitor/flame sense electrode
is sensing an adequate pilot
fame.
MV/PV (common).
PV (pilot voltage) - 24VAC
output will be present after the
ignition module is powered. The
voltage will remain present,
providing an adequate pilot
flame is sensed. If the pilot flame
is not sensed within the ignition
trial time, the ignition module
locks out which removes the
output voltage.
Burner ground.
24VAC ground.
24VAC hot (input).
Spark voltage output to ignitor/
flame sense electrode; and for
pilot flame current "rectification".