52
SERVICING
S-1
CHECKING VOLTAGE ...................................... 53
S-2
CHECKING WIRING ........................................ 53
S-3A
THERMOSTAT AND WIRING .............................. 53
S-3B
HEATING ANTICIPATOR/ CYLCE RATE .................. 54
S-4
CHECKING TRANSFORMER AND CONTROL CIRCUIT . 54
S-300
CHECKING PRIMARY LIMIT CONTROL ................. 54
S-301
CHECKING AUXILIARY LIMIT CONTROL ................ 54
S-302
CHECKING FLAME ROLLOUT CONTROL .............. 55
S-303
INDUCED DRAFT BLOWER MOTOR ..................... 55
S-304
MODULATING GAS VALVE
CHECK / ADJUSTMENT ................................ 55
S-304A CHECKING INDUCTOR COIL ............................. 56
SERVICING
S-305
CHECKING MAIN BURNERS ............................. 57
S-306
CHECKING ORIFICES ..................................... 57
S-307
CHECKING GAS PRESSURE .............................. 57
S-308
CHECKING HOT SURFACE IGNITOR ................... 58
S-309
CHECKING FOR FLASHBACK ............................ 58
S-310
CHECKING PRESSURE CONTROL ...................... 58
S-311
HIGH ALTITUDE APPLICATION .......................... 59
S-312
CHECKING FOR DELAYED IGNITION ................... 59
S-313
CHECKING INTEGRATED
IGNITION CONTROL BOARDS ....................... 59
S-314
CHECKING FLAME SENSOR ............................ 60
