17
SERVICING
S-1 CHECKING VOLTAGE .......................................................................................................................................... 18
S-2 CHECKING WIRING .............................................................................................................................................. 18
S-3A THERMOSTAT AND WIRING ................................................................................................................................ 18
S-3B HEATING ANTICIPATOR ...................................................................................................................................... 18
S-4 CHECKING TRANSFORMER AND CONTROL CIRCUIT .................................................................................... 19
S-16 CHECKING AIR CIRCULATOR BLOWER MOTOR .......................................................................................... 19
S-200 CHECKING DUCT STATIC .................................................................................................................................... 20
S-201 CHECKING TEMPERATURE RISE ....................................................................................................................... 20
S-300 CHECKING PRIMARY LIMIT CONTROL .............................................................................................................. 21
S-301 CHECKING AUXILIARY LIMIT CONTROL ............................................................................................................ 22
S-302 CHECKING FLAME ROLLOUT CONTROL........................................................................................................... 22
S-303 INDUCED DRAFT BLOWER MOTOR .................................................................................................................. 23
S-304 CHECKING GAS VALVE (REDUNDANT) .......................................................................................................... 23
S-305 CHECKING MAIN BURNERS ............................................................................................................................... 24
S-306 CHECKING ORIFICES .......................................................................................................................................... 24
S-307 CHECKING GAS PRESSURE............................................................................................................................... 24
S-308 CHECKING HOT SURFACE IGNITOR ................................................................................................................. 27
S-309 CHECKING FOR FLASHBACK ............................................................................................................................. 27
S-310 CHECKING PRESSURE SWITCH ........................................................................................................................ 27
S-311 HIGH ALTITUDE APPLICATION (USA) ................................................................................................................. 28
S-312 CHECKING FOR DELAYED IGNITION ................................................................................................................. 28
S-313 CHECKING INTEGRATED IGNITION CONTROL BOARDS .............................................................................. 28
S-314 CHECKING FLAME SENSOR ............................................................................................................................. 29
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