SERVICING
31
S-1 CHECKING VOLTAGE ..........................................................................................................................35
S-2 CHECKING WIRING .............................................................................................................................35
S-3A THERMOSTAT AND WIRING ...............................................................................................................35
S-3B HEATING ANTICIPATOR ......................................................................................................................35
S-4 CHECKING TRANSFORMER AND CONTROL CIRCUIT .................................................................. 36
S-16A CHECKING AIR CIRCULATOR BLOWER MOTOR (MULTI-SPEED ECM MOTOR) ......................36
S-200 CHECKING DUCT STATIC ................................................................................................................... 37
S-201 CHECKING TEMPERATURE RISE .....................................................................................................37
S-300 CHECKING PRIMARY LIMIT CONTROL ............................................................................................38
S-302 CHECKING FLAME ROLLOUT CONTROL .........................................................................................39
S-303 INDUCED DRAFT BLOWER MOTOR .................................................................................................40
S-304 CHECKING GAS VALVE (REDUNDANT) ............................................................................................40
S-305 CHECKING MAIN BURNERS ..............................................................................................................40
S-306 CHECKING ORIFICES .........................................................................................................................40
S-307 CHECKING GAS PRESSURE ..............................................................................................................41
S-308 CHECKING HOT SURFACE IGNITOR ................................................................................................43
S-309 CHECKING FOR FLASHBACK ............................................................................................................ 43
S-310 CHECKING PRESSURE SWITCH .......................................................................................................43
S-311 HIGH ALTITUDE APPLICATION (USA) .............................................................................................43
S-312 CHECKING FOR DELAYED IGNITION ...............................................................................................44
S-313 CHECKING INTEGRATED IGNITION CONTROL BOARDS ........................................................... 44
S-314 CHECKING FLAME SENSOR ............................................................................................................ 46
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