98
SERVICING
S-1 CHECKING VOLTAGE.............................................................................................................. 99
S-2 CHECKING WIRING ................................................................................................................. 99
S-3 CHECKING THERMOSTAT, WIRING, AND ANTICIPATOR ....................................................99
S-3A Thermostat and Wiring ............................................................................................................ 99
S-3B Heating Anticipator................................................................................................................... 99
S-4 CHECKING TRANSFORMER AND CONTROL CIRCUIT....................................................100
S-15 CHECKING CAPACITOR ....................................................................................................... 101
S-15A Resistance Check .................................................................................................................. 101
S-16A CHECKING AIR CIRCULATOR BLOWER MOTOR ............................................................. 101
S-200 CHECKING DUCT STATIC .................................................................................................... 113
S-201 CHECKING TEMPERATURE RISE ....................................................................................... 113
S-300 CHECKING PRIMARY LIMIT CONTROL.............................................................................. 114
S-301 CHECKING AUXILIARY LIMIT CONTROL ............................................................................ 115
S-302 CHECKING FLAME ROLLOUT CONTROL ......................................................................... 117
S-303 TEST INDUCED DRAFT MOTOR ......................................................................................... 118
S-304 CHECKING GAS VALVE .........................................................................................................118
S-305 CHECKING MAIN BURNERS ................................................................................................ 118
S-306 CHECKING ORIFICES ........................................................................................................... 118
S-307 CHECKING GAS PRESSURE................................................................................................ 119
S-308 CHECKING HOT SURFACE IGNITOR.................................................................................. 122
S-309 CHECKING FOR FLASHBACK .............................................................................................. 123
S-310 CHECKING PRESSURE CONTROL .................................................................................... 123
S-311 HIGH ALTITUDE APPLICATON (USA) ................................................................................... 124
S-312 CHECKING FOR DELAYED IGNITION ................................................................................. 124
S-313 CHECKING IGNITION CONTROL BOARDS ....................................................................... 124
S-314 CHECKING FLAME SENSOR................................................................................................ 128
SERVICE NUMBERS