Control Box - Lennox XP21 Series Installation Instructions Manual

FAN MOTOR CONTROL (A177)
PULSE−WIDTH MODULATION (PWM)

CONTROL BOX

HEAT PUMP
CONTROL (A175)
Verify DC voltage output using fan pwm out and com
terminals. see table 15 for optimal DC voltage based on
CFM profile used.
GREEN
RED
RED
YELLOW
YELLOW
YELLOW
Figure 35. Fan Motor Control, Wiring, Jumper Settings, Testing and LED Location
J2
COM
FAN PWM OUT
HIGH PRESSURE SWITCH (S4)
HEAT PUMP CONTROL
Page 51
CFM Profile Pin Select
JUMPER
JUMPER
OFF
ON
J2
YELLOW
BLUE
BLACK
YELLOW
YELLOW
FAN MOTOR
CONTROL
SEE TABLE 15 FOR CFM PROFILE
SELECTION OPTIONS.
LED
GREEN
RED
RED
B4 FAN
MOTOR
BLACK
BROWN
XP21 SERIES