INSTALLATION INSTRUCTIONS R40403-003 Blower Control Replaces R40403-001, R40403-002 & 20054502 997-050150-1 These instructions must be read and understood completely before attempting installation. WARNING Improper installation, adjustment, service, or maintenance can cause property damage, personal injury, or death. Consult a qualified installer, service agency, or the gas supplier for information or assistance. TABLE OF CONTENTS Specifications Application...
R40403-003 CONTROL BOARD LAYOUT S153 TRANSFORMER PRIMARY HOT (CONNECTED T0 1) — BI-NE TRANSFORMER PRIMARY NEUTRAL DO) “UNUSED UNCONNECTED TERMINALS FOR UNUSED MOTOR SPEED TAPS J [led] COOL COOL SPEED CIRCULATING BLOWER TAP (SOT) £08 HEAT HEAT SPEED CIRCULATING BORER TAP (HOD) ~ CO COSSETTING TAN BONER TAP Bs FUSE “we TRADUCER QUTPYT ‘ol EAC POKER FOR ELECTRICAL AIR CLEANER (HOT) 7 op THERMOSTAT CALL FOR COOL MOUNTING HOLES cr COON /GROOVED Ki 24 VAC FROM SYSTEM TRANSFORMER “HN 120 VAC ROPER FOR WEIGHTLIFTER
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If a replacement blower control was ordered by number 20054502 it is important to read and follow this section of the instructions! IMPORTANT If this board is replacing a Honeywell ST9120A or 8T9120B board on a dedicated horizontal furnace equipped with a spark ignition system, the following procedures MUST be performed to avoid potential nuisance lockouts. Cut all wire ties holding the red ignition cable in the bundle with low voltage wires.