Control Panel - Lennox XC21 Series Unit Information

PULSE−WIDTH MODULATION (PWM)
MAIN 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 22. Fan Control, Wiring, Jumper Settings, Testing and LED Location
XC21
FAN MOTOR CONTROL (A177)

CONTROL PANEL

J2
COM
FAN PWM OUT
HIGH PRESSURE SWITCH (S4)
MAIN CONTROL (A175)
JUMPER
OFF
J2
YELLOW
BLUE
BLACK
YELLOW
YELLOW
FAN MOTOR
Page 44
CFM Profile Pin Select
JUMPER
ON
GREEN
RED
RED
FAN MOTOR
(B4)
BLACK
BROWN
CONTROL
SEE TABLE 15 FOR CFM PROFILE
SELECTION OPTIONS.
XC21−XXX−230−05 AND LATER
LED