SERVICING
59
S-1 CHECKING VOLTAGE................................................................................................................................. 62
S-2 CHECKING WIRING .................................................................................................................................... 62
S-3A THERMOSTAT AND WIRING ..................................................................................................................... 62
S-3B HEATING ANTICIPATOR ............................................................................................................................. 62
S-4 CHECKING TRANSFORMER AND CONTROL CIRCUIT ............................................................................. 63
S-16A CHECKING AIR CIRCULATOR BLOWER MOTOR (ECM) ........................................................................... 63
S-200 CHECKING DUCT STATIC ........................................................................................................................... 66
S-201 CHECKING TEMPERATURE RISE ............................................................................................................. 67
S-300 CHECKING PRIMARY LIMIT CONTROL...................................................................................................... 67
S-301 CHECKING AUXILIARY LIMIT CONTROL .................................................................................................... 68
S-302 CHECKING FLAME ROLLOUT CONTROL .................................................................................................. 69
S-303 INDUCED DRAFT BLOWER MOTOR.......................................................................................................... 70
S-304 CHECKING GAS VALVE (REDUNDANT) .................................................................................................... 70
S-305 CHECKING MAIN BURNERS ...................................................................................................................... 70
S-306 CHECKING ORIFICES ................................................................................................................................70
S-307 CHECKING GAS PRESSURE..................................................................................................................... 71
S-308 CHECKING HOT SURFACE IGNITOR ......................................................................................................... 74
S-309 CHECKING FOR FLASHBACK ................................................................................................................... 74
S-310 CHECKING PRESSURE SWITCH............................................................................................................... 74
S-311 HIGH ALTITUDE APPLICATION (USA) ....................................................................................................... 75
S-312 CHECKING FOR DELAYED IGNITION ........................................................................................................ 75
S-313 CHECKING INTEGRATED IGNITION CONTROL BOARDS........................................................................ 75
S-314 CHECKING FLAME SENSOR................................................................................................................... 77
SERVICING TABLE OF CONTENTS