Daikin Perfera RXM R Series Service Manual page 139

To install the main PCB
RXM20~71R + ARXM25~71R + FTXM20~71R + ATXM25~50R +
FVXM25~50A
Split New Perfera R32
ESIE20-11 – 2021.01
i Ferrite core (compressor harness)
j Screw
k Main PCB
3 Remove the screw and remove the ground wiring from the switch box. Route
the ground wire out of the ferrite core.
4 If applicable: Disconnect the connector X12A.
5 Disconnect the compressor connector.
6 Cut the tie straps that fix the compressor harness to the switch box.
7 Route the compressor harness out of the ferrite core.
8 Disconnect all other connectors from the main PCB.
9 Remove the screws from the main PCB.
10 Remove the main PCB from the unit.
11 To install the main PCB, see
1 Apply grease to the PCB contact surface of the heat sink. Distribute the grease
as evenly as possible.
CAUTION
ALWAYS apply new grease on the PCB heat sink. NOT doing so may cause the PCB to
fail due to insufficient cooling.
2 Install the main PCB in the correct location in the switch box.
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a Power supply wires from X1M
b Ferrite core (power supply wires)
c Tie strap (power supply wires)
d Screw (ground wiring)
e Ferrite core (ground wiring)
f Connector X12A
g Compressor connector
h Tie strap (compressor harness)
i Ferrite core (compressor harness)
j Screw
k Main PCB
3 Install and tighten the screws.
4 Route the compressor harness through the ferrite core and connect the
compressor connector.
5 Install new tie straps to fix the compressor harness to the switch box.
"Repair procedures" [
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Service manual
139