Garland AIR-DECK GAS BAKE AND PIZZA OVENS - Manuel (Page 17)

Part # 1382670 (12/07) Page 17
INTERMITTENT PILOT INSTRUCTIONS Continued
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START
TROUBLE SHOOTING
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IS POWER ON -
MEASURE 25 V
THERMOSTAT CALLS
FOR HEAT
SPARK ACROSS
IGNITER / SENSOR GAP
PILOT BURNER LIGHTS
SPARK STOPS WHEN
PILOT IS LIT
MAIN BURNER LIGHTS
SYSTEM RUNS UNTIL
CALL FOR HEAT ENDS
CALL FOR HEAT ENDS:
SYSTEM SHUTS OFF
TROUBLE SHOOTING ENDS
CHECK LINE VOLTAGE POWER, LOW VOLTAGE TRANSFORMER,
AND LOW VOLTAGE WIRING.
CHECK THERMOSTAT AND CONTROLLERS.
PULL IGNITION LEAD
AND CHECK SPARK AT
IGNITION STUD. CHECK IGNITION CABLE,
GROUND WIRING, ELECTRODE
CERAMIC INSULATOR AND
GAP AND CORRECT.
CHECK THAT ALL MANUAL GAS COCKS ARE OPEN, SUPPLY
TUBING AND PRESSURES ARE GOOD, AND PILOT BURNER ORIFICE
IS NOT BLOCKED. CHECK ELECTRICAL CONNECTIONS BETWEEN
CONTROL AND PILOT OPERATOR ON GAS CONTROL. CHECK FOR
24 V AT TERMINALS 1 & 5, IF NO VOLTAGE REPLACE CONTROL.
REPLACE
CHECK CONTINUITY OF IGNITION CABLE AND GROUND WIRE.
CHECK THAT PILOT FLAME COVERS BOTH ELECTRODES. IF
CHECKS ARE OKAY, REPLACE MODULE.
CHECK FOR 24 V AT TERMINALS 3 & 5. IF NO VOLTAGE REPLACE
MODULE. CHECK ELECTRICAL CONNECTIONS BETWEEN
MODULE AND GAS CONTROL. IF OKAY, REPLACE GAS CONTROL.
CHECK CONTINUITY OF IGNITION CABLE AND GROUND WIRE.
NOTE: IF GROUND IS POOR OR ERRATIC SHUTDOWNS MAY OCCUR
OCCASIONALLY EVEN THOUGH OPERATION IS NORMAL AT THE
TIME OF THE CHECKOUT. CHECK FOR EXCESSIVE HEAT AT
ELECTRODE INSULATOR (TEMPERATURE ABOUT 600° F (315° C)
CAUSES SHORT TO GROUND). IF CHECK ARE OKAY, REPLACE
MODULE.
CHECK FOR PROPER THERMOSTAT OR CONTROLLER
OPERATION REMOVE AT MODULE; IF VALVE CLOSES, REPLACE
MODULE, IF NOT, REPLACE GAS CONTROL.
REPEAT PROCEDURE UNTIL TROUBLE FREE OPERATION IS OBTAINED.
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Trouble Shooting
NOTE: The Electronic S86 Control Module cannot be
repaired. If troubleshooting indicates a malfunction in the
S86 the S86 module must be replaced. Intermittent pilot
systems should be serviced only by trained and experienced
personnel.