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PROBLEM
Indoor blower motor does not operate at
the correct speed.
YES
NO
CHECK SPEED SETTINGS
Check blower speed jumpers on blower control module to ensure proper selection.
Is motor operating properly?
Recheck all wiring connections.
YES
NO
CHECK WIRING
D
Ensure that 6−pin connector is securely plugged into blower control module.
D
Ensure that 3−pin motor connector is securely connected.
D
Check power supply wiring to blower control module from 120HOT and neutral
terminals on SureLight® control board.
D
Ensure that leads from 6−pin connector are securely connected to the proper terminals
on the SureLight® control board.
D
Make sure blower access panel is replaced properly to close door interlock switch and
energize SureLight® control board.
D
Check for proper demand from thermostat.
Is motor operating properly?
Recheck all wiring connections.
CHECK BLOWER CONTROL MODULE
Proper blower control module must be installed:
D
79M82 −− 3−ton models.
D
79M83 −− 4−ton models.
D
79M84 −− 5−ton models.
YES
Blower control module is not working
properly. Replace blower control
module.
CAUTION
The blower control module and single−tap motor used in G50UHi units are
designed specifically for use with one another. If a PSC blower motor is used
to provide emergency operation, the PSC motor must be connected to the
SureLight® control board, rather than the blower control module. If the
SureLight® control board is used to control blower operation in an emergency
situation, the single−tap motor must be temporarily replaced using a PSC
motor. If these instructions are ignored, control board or blower motor failure
may result, causing a potentially hazardous condition.
Summary of Contents for G50UHi Series
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