Gree GMV-1015WM/G-U, Service Manual

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Gree GMV6 DC Inverter VRF Units Service Manual
265
Inspection procedure
1. Preparations
(1) Use the wired controller or remote controller to shut down the unit.
(2) Remove the front cover and open the electrical appliance box.
2. Inspection of low-pressure sensor
(1) Connect the pressure gauge to the gas valve and check if the gas and liquid valves are open.
(2) Switch the unit to the cooling mode. After the system stabilizes, check the reading of the pressure
gauge.
(3) Check the unit’s suction pressure via the wired controller and compare it with the reading of the
pressure gauge on the gas valve. If the value shown on the wired controller is within the range of
±10% of the reading of the pressure gauge, the pressu re sensor is normal. Otherwise, it is abnormal.
3. Inspection of high-pressure sensor
(1) Connect the pressure gauge to the gas valve and check if the gas and liquid valves are open.
(2) Switch the unit to the heating mode. After the system stabilizes, check the reading of the pressure
gauge.
4. Check the unit’s exhaust pressure via the wired controller and compare it with the reading of the
pressure gauge on the gas valve. If the value shown on the wired controller is within the range of
±10% of the reading of the pressure gauge, the pressure sensor is normal. Otherwise, it is abnormal.