GREE U-Match 6 SERIES UNIT SERVICE MANUAL
86
D- Connect to the exhaust side
Caution! High temperature!
Labels on the 4-way valve:
D-connect to the exhaust side; E-connect to the evaporator of indoor unit;
S-connect to the inhalation side of the liquid separator; C-connect to the condenser;
When the system is in cooling mode, C-the pipeline is with high pressure and high temperature; E,
S-the pipeline is with low pressure and low temperature;
When the system is in heating mode, E-the pipeline is with high pressure and high temperature; C,
S-the pipeline is with low pressure and low temperature;
Because D is connected to the exhaust side, it is with high pressure and high temperature regardless
of the operating mode. When the unit is powered on, in defrosting or oil return mode, the 4-way valve will
produce some noise. Do not touch the pipes directly with your hands and be cautious of the hot
temperature.
Step 4:
Check the drive board of compressor, i.e. the IPM module.
Please refer to the IPM checking method in the section of troubleshooting.
Check the drive board of compressor, i.e. the IPM module.
Please refer to the IPM checking method in the section of troubleshooting.
B
．
On condition that the unit cannot be started up
Step 1:
Cut off the power supply and detach the cover of the wiring box of the compressor. Check the wiring
of the compressor.
Step 2:
Check the resistance between the wiring terminals (U, V, W) of compressor.
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