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XC17
AIR
CONDITIONER
CONTROL (A175)
CONTROL BOX
FAN MOTOR CONTROL (A177)
PULSE−WIDTH MODULATION (PWM)
ONE YELLOW WIRE FROM PS (E24) TERMINAL ON AIR
CONDITIONER CONTROL. AND SECOND YELLOW WIRES ON
PIGGYBACK TERMINALS GOES TO S4 HIGH PRESSURE SWITCH.
GREEN
RED
BROWN
RED
BLACK
RED
RED
GREEN
FAN MOTOR
CONTROL
YELLOW
BLACK
YELLOW
BLUE
SEE TABLE 14 FOR CFM PROFILE
SELECTION OPTIONS.
BLACK WIRE
YELLOW WIRE
VAC
VDC
24
EXT PWR/R (24VAC INPUT
DURING DEMAND ONLY)
BLUE WIRE
YELLOW
YELLOW
YELLOW
S4 HIGH PRESSURE SWITCH
YELLOW
AIR CONDITIONER CONTROL
B4 FAN
MOTOR
INPUT VOLTAGES DURING DEMAND
ECM/Y1 ONLY − 24VDC
Figure 22. Testing for External Power to Fan Motor Control
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