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

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Gree GMV6 DC Inverter VRF Units Service Manual
290
Pipe diameter range
(mm)
Nitrogen pressure
range (MPa)
Pipe length (m)
Shortest pre-charge
time (s)
Shortest hysteresis
nitrogen charging time
(s)
Φ53.9 ~ Φ104.8 0.03~0.1 ≤3 75 400
(1) Before the 4-way valve is welded, record the direction of the 4-way valve and the installation
location of each nozzle.
When welding, wrap the surrounding components with a damp cloth carefully, and do not get the
other components burnt.
(2) Remove the old 4-way valve from the pipeline.
1 ---- 4-way valve
D - Gas pipe, connecting to the exhaust pipe of the cooling compressor;
C - Gas pipe, connecting to the inlet pipe of the condenser.
S - Gas pipe, connecting to the suction pipe of the cooling compressor;
E - Gas pipe, connecting to the air return pipe of the evaporator.
Installation procedure
(1) Install the new 4-way valve to the exact position.
(2) Connect the new 4-way valve to the pipeline.
(3) When welding the 4-way valve, wrap the valve body with a damp cloth to prevent the slider in
the valve from being burned out and the water from flowing into the pipe.
(4) Nitrogen protection should be applied during welding. Refer to Table 1 for nitrogen pressure.
(5) Install the 4-way valve coil by referring to 5.5 Installing 4-way Valve Coil (YV1).
(6) Fix the wires according to the original requirements. Refer to the unit wiring diagram.
(7) Make sure that the components and cables are properly connected.
(8) After checking that there is no problem, buckle the front panel and tighten the screws.
5.7 Removing and Installing Electronic Expansion Valve
Preparations
(1) Use the power circuit breaker to switch off the power of the GMV6 VRF system. Make sure that
the unit pipeline system is free of refrigerant.