66
SERVICING
S-1
CHECKING VOLTAGE ................................. 67
S-2
CHECKING WIRING ..................................... 67
S-3A
THERMOSTAT AND WIRING ....................... 67
S-3B
HEATING ANTICIPATOR/ CYLCE RATE ....... 68
S-4
CHECKING TRANSFORMER
AND CONTROLCIRCUIT ........................... 68
S-300 CHECKING PRIMARY LIMIT CONTROL ...... 68
S-30
CHECKING AUXILIARY LIMIT CONTROL ..... 68
S-302 CHECKING FLAME ROLLOUT CONTROL ... 69
S-303 INDUCED DRAFT BLOWER MOTOR ......... 69
S-304 CHECKING MODULATING GAS VALVE ..... 69
S-304A CHECKING INDUCTOR COIL ....................... 69
S-305 CHECKING MAIN BURNERS ...................... 71
SERVICING
S-306 CHECKING ORIFICES ................................. 71
S-307 CHECKING GAS PRESSURE ..................... 71
S-308 CHECKING HOT SURFACE IGNITOR .......... 72
S-309 CHECKING FOR FLASHBACK .................... 72
S-310 CHECKING PRESSURE CONTROL ............ 72
S-311 HIGH ALTITUDE APPLICATION .................... 73
S-312 CHECKING FOR DELAYED IGNITION ........ 73
S-313 CHECKING INTEGRATED
IGNITION CONTROL BOARDS ............... 73
S-314 CHECKING FLAME SENSOR ................... 74
