Service Manual

SERVICING
53
S-1 CHECKING VOLTAGE .................................... 54
S-2 CHECKING WIRING ...................................... 54
S-3A THERMOSTAT AND WIRING ............................ 54
S-3B HEATING ANTICIPATOR/ CYLCE RATE ................ 55
S-4 CHECKING TRANSFORMER
AND CONTROL CIRCUIT............................. 55
S-300 CHECKING PRIMARY LIMIT CONTROL ............... 55
S-301 CHECKING AUXILIARY LIMIT CONTROL .............. 55
S-302 CHECKING FLAME ROLLOUT CONTROL ............. 56
S-303 INDUCED DRAFT BLOWER MOTOR ................... 56
S-304 MODULATING GAS VALVE CHECK/ADJUSTMENT ... 56
S-304A CHECKING INDUCTOR COIL............................ 57
SERVICING
S-305 CHECKING MAIN BURNERS ............................ 58
S-306 CHECKING ORIFICES .................................... 58
S-307 CHECKING GAS PRESSURE ............................. 58
S-308 CHECKING HOT SURFACE IGNITOR................... 58
S-309 CHECKING FOR FLASHBACK ........................... 58
S-310 CHECKING PRESSURE CONTROL...................... 59
S-311 HIGH ALTITUDE APPLICATION ......................... 60
S-312 CHECKING FOR DELAYED IGNITION .................. 60
S-313 CHECKING INTEGRATED IGNITION
CONTROL BOARDS................................... 60
S-314 CHECKING FLAME SENSOR .......................... 61