Field Configuration And Testing - Lennox Collection XC21 System Installation Instructions Manual

Field Configuration and Testing

This section provides procedures for configuring,
adjusting and testing various components of this unit.
S
Fan Motor (B4) Test Procedure
S
Fan Motor Control (A177) Configuration and Testing
S
Top Grille and Fan Motor Mounting Adjustment (Fan
Clearance)
S
Heat Pump Control (A175) Unit Nominal Capacity
Code configuration
FAN MOTOR (B4) TEST PROCEDURE
The following procedure can be used to test the fan
motor operation. A fully charged 9V battery will be
required for this procedure. See figure 30 for complete
test procedure.
This is a test that will verify that the motor does operate.
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.
REMOVE BOTH LEADS
FROM J2 TERMINALS
BLACK LEAD
BROWN LEAD
506587−01
FAN MOTOR CONTROL
BLACK LEAD
J2
CONNECT B4 FAN
MOTOR BLACK COMMON
WIRE TO 9V BATTERY
NEGATIVE TERMINAL
NEGATIVE TERMINAL
Figure 30. Fan Motor (B4) Test
Page 42
FAN MOTOR CONTROL (A177) LED CODES AND
SEQUENCE OF OPERATION
This section provides information concerning operation
and testing of the fan control.
Fan Motor Control Sequence of Operation
During start up, the following sequence is followed:
1. Display error conditions (see table 12), if present
2. If no errors are detected, then the LED code indicating
stage operation (see table 13) will display the
applicable code and then a long pause.
3. The fan motor speed / RPM (revolutions per minute)
indicator is displayed next (see table 11).
4. There is a short pause.
The above sequence will continue to repeat if a thermostat
demand is present. See figure 31 for LED sequence. See
table 13 for description of flash and pause durations.
BLACK LEAD
BROWN LEAD
FULLY CHARGED
9V BATTERY
BROWN LEAD
CONNECT B4 FAN MOTOR
WIRE TO 9V BATTERY
V
POSITIVE TERMINAL
POSITIVE TERMINAL