Service Manual

SERVICING
69
TABLE OF CONTENTS
S-1 CHECKING VOLTAGE ............................................................................................................................................. 72
S-2 CHECKING WIRING ............................................................................................................................................... 72
S-3A THERMOSTAT AND WIRING ................................................................................................................................... 72
S-3B HEATING ANTICIPATOR ......................................................................................................................................... 72
S-4 CHECKING TRANSFORMER AND Control CIRCUIT............................................................................................ 73
S-16A CHECKING AIR CIRCULATOR BLOWER MOTOR (ECM)..................................................................................... 73
S-200 CHECKING DUCT STATIC ..................................................................................................................................... 76
S-201 CHECKING TEMPERATURE RISE ........................................................................................................................ 77
S-300 CHECKING PRIMARY LIMIT CONTROL ................................................................................................................ 77
S-301 CHECKING AUXILIARY LIMIT CONTROL .............................................................................................................. 78
S-302 CHECKING FLAME ROLLOUT CONTROL ............................................................................................................ 79
S-303 INDUCED DRAFT BLOWER Motor ........................................................................................................................ 80
S-304 CHECKING GAS VALVE (Redundant) .................................................................................................................... 80
S-305 CHECKING MAIN BURNERS ................................................................................................................................. 80
S-306 CHECKING ORIFICES ........................................................................................................................................... 80
S-307 CHECKING GAS PRESSURE ................................................................................................................................ 81
S-308 CHECKING HOT SURFACE IGNITOR ................................................................................................................... 83
S-309 CHECKING FOR FLASHBACK ............................................................................................................................... 84
S-310 CHECKING PRESSURE SWITCH ......................................................................................................................... 84
S-311 HIGH ALTITUDE APPLICATION (USA).................................................................................................................... 84
S-312 CHECKING FOR DELAYED IGNITION ................................................................................................................... 85
S-313 CHECKING INTEGRATED IGNITION CONTROL BOARDS ................................................................................ 85
S-314 CHECKING FLAME SENSOR ............................................................................................................................... 86