R410A DC Inverter VRF V4 Plus W Series 50Hz MCAC-VTSM-2016-04
216 Troubleshooting
Extend the power line of the inverter compressor of system B, connect compressor A to the control box of
system B, make sure that the U, V, W terminals are connected in right order, then start system B.
If compressor A can start normally, that means compressor is OK, the control box of system A is malfunction,
then raplace the main PCB of system A with correct wire connection.
If compressor A can not start normally, that means compressor A is demaged, needs to be replaced.
If there is not a normal system nearby:
Replace the main PCB of system A with correct connection, if compressor A can start normally, it means the
main PCB which is replaced is damaged. If compressor A still can’t start normally, replace the compressor.
5) Guide for compressor replacement
Step 1: Take out the compressor from the faulted outdoor unit, pour out the oil from the compressor according
to the method illustrated. Normally the oil will outflow from the discharge pipe of the compressor.
Step 2: check the oil of the system
Normally the oil is clear and transparent, if it is a little yellowing, it is also OK. However, if the oil is become
Power line (U, V, W terminal)
the control box of a
normal system B, check
whether compressor A
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