SERVICING
27
S-1 CHECKING VOLTAGE ................................................................................................................................32
S-2 CHECKING WIRING ................................................................................................................................... 32
S-3A THERMOSTAT AND WIRING .....................................................................................................................32
S-3B HEATING ANTICIPATOR ............................................................................................................................32
S-4 CHECKING TRANSFORMER AND CONTROL CIRCUIT .......................................................................33
S-16A CHECKING AIR CIRCULATOR BLOWER MOTOR (MULTI-SPEED ECM MOTOR) ............................ 33
S-200 CHECKING DUCT STATIC .........................................................................................................................34
S-201 CHECKING TEMPERATURE RISE ........................................................................................................... 34
S-300 CHECKING PRIMARY LIMIT CONTROL .................................................................................................. 35
S-301 CHECKING AUXILIARY LIMIT CONTROL ............................................................................................... 36
S-302 CHECKING FLAME ROLLOUT CONTROL ..............................................................................................36
S-303 INDUCED DRAFT BLOWER MOTOR ....................................................................................................... 37
S-304 CHECKING GAS VALVE (REDUNDANT) .................................................................................................37
S-305 CHECKING MAIN BURNERS ....................................................................................................................37
S-306 CHECKING ORIFICES ............................................................................................................................... 37
S-307 CHECKING GAS PRESSURE ...................................................................................................................38
S-308 CHECKING HOT SURFACE IGNITOR ..................................................................................................... 40
S-309 CHECKING FOR FLASHBACK .................................................................................................................40
S-310 CHECKING PRESSURE CONTROL ........................................................................................................ 41
S-311 HIGH ALTITUDE APPLICATION (USA) ..................................................................................................... 41
S-312 CHECKING FOR DELAYED IGNITION .....................................................................................................41
S-313 CHECKING INTEGRATED IGNITION CONTROL BOARDS ................................................................42
S-314 CHECKING FLAME SENSOR .................................................................................................................44