Lennox XC21 Series User Manual

Page 46
XC21
Fan Motor (B4) Test Procedure
A simple test can be used to test the fan motor operation. A fully charged 9V battery will be required for this procedure.
J2
FAN PWM OUT
PARK
COM
BLACK LEAD
BROWN LEAD
BROWN LEAD
BLACK LEAD
REMOVE BOTH LEADS
FROM J2 TERMINALS
CONNECT FAN MOTOR BLACK
COMMON WIRE TO 9V BATTERY
NEGATIVE TERMINAL
FAN MOTOR CONTROL (A177)
BLACK LEAD
BROWN LEAD
FAN MOTOR TEST
FULLY CHARGED 9V BATTERY
THIS IS A TEST THAT WILL VERIFY THAT THE MOTOR DOES OPERATE.
J2
1. VERIFY MAIN (240 VOLT) POWER IF OFF TO UNIT.
2. REMOVE BOTH WIRES (BROWN AND BLACK) FROM THE J2 TERMINAL ON THE FAN MOTOR CONTROL
(A177).
3. ROOM THERMOSTAT SHOULD BE IN OFF POSITION (UNIT IN IDLE MODE − NO HEATING OR COOLING
DEMANDS)
4. TURN MAIN POWER (240 VOLT) ON TO UNIT.
5. CONNECT 9 VOLT BATTERY TO FAN MOTOR PLUGS AS NOTED IN PICTURE BELOW.
6. FAN MOTOR SHOULD RUN AT A REDUCED FAN SPEED.
7. IF FAN MOTOR DOES NOT RUN, THEN REPLACE FAN MOTOR ASSEMBLY.
NEGATIVE TERMINAL POSITIVE TERMINAL
CONNECT FAN MOTOR WIRE TO
9V BATTERY POSITIVE TERMINAL
V
Figure 24. Fan Motor (B4) Test  XC21−XXX−230−05 AND LATER

Lennox XC21 Series Specifications

General

Brand	Lennox
Model	XC21 Series
Category	Air Conditioner
Language	English