Si181296_A
BP Unit
Removal Procedure
21
2. BP Unit
2.1
PCB Assembly
Warning
Be sure to wait for 10 minutes or more after turning off all power supplies before
disassembling work.
Step
Procedure
Points
1
Remove the 4 screws
and remove the
electrical box cover.
The PCB is waterproof with
resin. This means that the
fuse and varistor cannot be
replaced.
When reassembling,
conduct test operation for
checking wrong wiring.
2
Disconnect the
connectors for the
electronic expansion
valve [X20A] [X21A]
[X22A] [X23A] and the
connector for the
thermistors [X90A].
[X20A]: bypass
[X21A]: for room A
[X22A]: for room B
[X23A]: for room C
(3-room models only)
[X90A]: thermistors
3
Remove the screw of
the wire harness band.
4
Remove the screw of
the earth / ground wire.
5
Disconnect the terminal
of the earth / ground
wire.
(Q0501)
(R18300)
Wire harness band
[X23A]
[X90A]
[X22A]
[X21A]
[X20A]
(R18516)
Earth / ground wire
(Q0507)
