Gree GMV-VQ680WM/C-X Service Manual page 271

Gree
Marks are made on the 4-way valve: D indicates connection to the exhaust side, E indicates
connection to the IDU evaporator, S indicates connection to the air inlet of gas-liquid separator, C
indicates connection to the condenser; when the system runs in the cooling mode, C indicates that the
pipeline is in the high-pressure and high-temperature status, while E and S indicate that the pipeline is in
the low-pressure and low-temperature status; when the system runs in the heating mode, E indicates
that the pipeline is in the high-pressure and high-temperature status, while C and S indicate that the
pipeline is in the low-pressure and low-temperature status; the pipe marked by D is connected to the air
outlet and remains in the high-pressure and high-temperature status. When the unit is being started,
defrosting and conducting oil return, the 4-way valve produces obvious valve pushing sound. Do not
touch the pipeline with hands. Otherwise, you may get scalded.
3) Oil-return solenoid valve: It can be diagnosed based on the oil-return valve status displayed on
the monitor program and the actual operation. When the balance valve is open, the coil heats
up and the lubricant flow before and after the valve is obvious.
Step 4:
GMV6 HR DC Inverter VRF Units Service Manual
D - Connecting to
the exhaust side.
Warning: high
temperature!
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