Gree GMV5E Series Service Manual page 252

GREE
Labels on the 4-way valve and their meanings: D – connects to exhaust; E – connects to IDU
evaporator; S – connects to intake of gas separator; C – connects to condenser. When the system is
cooling, the pipe at side C works at high pressure high temperature, the pipes at sides E and S work at
low pressure low temperature; when the system is heating, the pipe at side E works at high pressure
high temperature, the pipes at sides C and S work at low pressure low temperature. The pipe at side D
connects to exhaust and it is always working at high pressure high temperature. When units are starting,
defrosting, or returning oil, the valve will vibrate obviously. DO NOT touch the pipe; or, you may be
scalded.
③ Oil balance solenoid valve: This valve can be operated based on its state that is shown through
the monitoring software and actual situation. When this valve is opened, the coil will be heated
and lubricant at both sides of the valve flows.
Step 4:
Test the compressor drive, namely the IPM module, to see whether it is normal.
1. Disconnect the power supply. Five minutes later, remove the line of the faulty compressor.
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
D – Connects to exhaust.
Watch out for scald!
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