Air Purging And Refrigerant Charge - Gree Ultra Heat GMV Multi VRF Series Owner's Manual

2) For heat pump unit, liquid pipe should bear 70ºC(158℉) or above, and gas pipe should bear 120
ºC(248℉) or above. For cooling only unit, both liquid pipe and gas pipe should bear 70ºC(158℉)
or above. Example: Polyethylene foam can bear 120ºC(248℉) above and foaming polyethylene
can bear 100ºC(212℉) above.
3) Joints at indoor and outdoor units should be wrapped with insulating material and leave no
clearance between pipe and wall.
4) Manifold attached foam cannot be taken as insulating material.
5) When wrapping the tape, the later circle should cover half of the former one. Don't wrap the tape
so tightly, otherwise the insulation effect will be weakened.
6) After wrapping the pipe, adopt sealing material to completely fill the hole so as to prevent wind
and rain from entering the room.
4.4.4 Support and protection for pipeline
(1) Support should be made for hanging connection pipe. Distance between each support cannot be
over 1m (39-3/8inch).
(2) Protection towards accidental damage should be made for outdoor pipeline. If the pipeline
exceeds 1m (39-3/8inch), a pinch board should be added for protection.

4.5 Air Purging and Refrigerant Charge

4.5.1 Air purging
(1) Confirm outdoor liquid and gas valves are closed. Air purging from the nozzle located on liquid
and gas valves by vacuum pump.
Fig.28
Fig.29
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Ultra Heat GMV Multi VRF