Mitsubishi Electric CRHV-P600YA-HPB Service Handbook page 160

[ IX Troubleshooting ]
Heat Source Water Side Heat Exchanger Replacement Procedure
1
Service pane FU
Service panel FB
2
Service panel BB-PIPE
Service panel BB
3
High-voltage
wiring
Clamps 2
Power wires
and ground wire
Clamp 4
Clamp 3
HWE1312A
<MAIN>
control box
<SUB>
control box
<MAIN> high-pressure check joint
<SUB> high-pressure check joint
Low-voltage
wiring
Clamps
Communication
wires
1. At the front of the product, remove the service panel FU and
then remove the cover of the <MAIN> control box.
2. Set the SWS1 switch of the control board to OFF and then
turn the main power (breaker) OFF.
3. Remove the service panel FB and then remove the cover of
the <SUB> control box.
Caution
If the main power (breaker) is not turned OFF, the compressor
terminal part will be a live part even if you set the SWS1 switch
to OFF.
1. At the back of the product, remove the service panel BB and
BB-PIPE.
2. Perform refrigerant recovery from the high-pressure check
joints.
(If the refrigerant is recovered from low-pressure check joint,
there is a possibility that a compressor may break by the
shortage of lubricant.)
1. Disconnect the connector of the low-voltage wiring connected
to the control board of the <SUB> control box and then
remove the 4 clamps 1 securing the low-voltage wiring.
2. Disconnect the communication wires connected to the
terminal block.
3. Disconnect the exhaust fan power wires (CN510 white and
CNAC2 black), cooling fan connector (relay connector white),
belt heater wiring (CN502 white), solenoid coil wiring (CN501
white), and high-voltage switch wiring (CN801 yellow), and
then remove the 2 clamps 2 securing the high-voltage wiring.
4. Remove the 1 clamp 3 securing the compressor power
1
wiring.
5. Disconnect the power wires and ground wire and then remove
the 1 clamp 4 securing the wiring.
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GB