281 Issue 1 - Service Manual - BX3
35
Main Fan Assembly Removal (Cont)
Motor and plate removal
•
Remove the 7 screws that attach motor plate to the fan scroll then remove the motor
plate, motor and fan wheel assembly from the fan scroll.
•
Remove the fan from the motor by loosening the grub screw from the motor shaft. If the
fan wheel is ceased onto the motor shaft then use WD-40 and a puller may be required.
•
The motor may be removed from the motor plate if required by removing the bolts and
nuts that secure the motor to the motor stator brackets.
7.7 HCDSI24-1 Electronic Control Board Removal
1 Isolate the heater’s power supply.
2 Remove the spark igniter lead from the PCB assembly.
3 Remove all other electrical connections from the PCB assembly.
4 Remove the 4 screws that secure the HCDSI 24 -1 to the top plate of the fan
compartment.
WARNING: Care should be taken to prevent any damage to the wiring and PCB.
Installation is a reversal of the removal procedure with attention to the following points:
•
Ensure all wiring connections are positively located and that no looms have been
damaged.
7.8 240 to 24 Volt Transformer Removal
1. Isolate the heaters power supply.
2. Remove all inter-connecting conductors.
3. Remove the 2 screws that secure the transformer to the top plate of the fan compartment
Installation is a reversal of the removal procedure with attention to the following points:
1.75A Transformer
Nominal Voltage/ Maximum
Current
230 VAC / 1.75 A
Secondary Voltage (No Load)
(Blue – Yellow) @ 230 VAC
24 – 28.5 VAC
Secondary Voltage (With Load)
(Blue -Yellow) @ 230 VAC
24
±
3% VAC
Resistance reading on primary wiring @ 20
0
C
63.6
Ω
Resistance reading on Secondary @ 20
0
C
1.45
Ω
