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