Vulcan-Hart GRS25 Service Manual page 9

SECTION I
GRD AND GRC SERIES (ONLY) SERVICE CHECKS
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MV PV PV GND
WARNING: UNPLUG FRYER BEFORE SERVICING.
WARNING: SHUT OFF GAS BEFORE SERVICING.
WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR
MEASUREMENTS WHILE POWER IS APPLIED TO THE FRYER. EXERCISE EXTREME
CAUTION AT ALL TIMES. IF TEST POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT
POWER, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.
If erratic ignitor operation is experienced check for the following:
1. If you are experiencing system lock out, reset system by turning power switch off wait several minutes and
turn switch on.
2. Check for good metal to metal contact between the pilot bracket and main pilot burner.
3. Check that all lead connections from the ignition module to the ignitor system are solid.
4. Check that GRD (BUR) lead from the module to the pilot burner are solid and that there is not any damage
to the wiring. If damage is detected either replace the ignitor assembly or the ignitor wire with no.14-18
gauge, moisture-resistant, thermoplastic insulated wire with a min. 105 degrees C (221 degrees F.) rating.
5. Check the ceramic flame rod insulator of the ignitor for cracks or evidence of extreme heat. If one or both
of these conditions are found replace the pilot ignitor assembly.
6. Check to insure that ignitor boot is not loose or damaged.
If the above visual checks are positive the following checks should be performed using a jumper
wire and voltage meter.
CHECKING THE SPARK IGNITION CIRCUIT
WARNING: THE IGNITION CIRCUIT GENERATES OVER 10,000 VOLTS AND ELECTRIC SHOCK CAN
RESULT. DO NOT TOUCH THE STRIPPED END OF JUMPER TO THE SPARK
TERMINAL.
NOTE: You will need a short jumper wire made from ignition cable or other heavily insulated wire.
1. Close the manual gas valve.
2. Disconnect the ignition cable at the SPARK terminal on the module.
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MV BUR 24V 24V W
GNDHOT TH
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SEN SPK