Lennox XC17 Series Unit Information page 43

FAN MOTOR CONTROL (A177)
PULSE−WIDTH MODULATION (PWM)
CONTROL BOX
AIR
CONDITIONER
CONTROL (A175)
VERIFY DC VOLTAGE OUTPUT USING FAN PWM OUT AND
COM TERMINALS. SEE TABLE 14 FOR OPTIMAL DC
VOLTAGE BASED ON CFM PROFILE USED.
GREEN
RED
RED
YELLOW
YELLOW
YELLOW
Figure 21. Fan Motor Control, Wiring, Jumper Settings, Testing and LED Location
J2
COM
FAN PWM OUT
HIGH PRESSURE SWITCH (S4)
AIR CONDITIONER CONTROL
Page 43
CFM Profile Pin Select
JUMPER
JUMPER
OFF
ON
J2
YELLOW
BLUE
BLACK
YELLOW
YELLOW
FAN MOTOR
CONTROL
SEE TABLE 14 FOR CFM PROFILE
SELECTION OPTIONS.
LED
GREEN
RED
RED
B4 FAN
MOTOR
BLACK
BROWN
XC17