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

(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.
(2) Because air extraction from outdoor unit's liquid valve, high pressure gas valve and low pressure
gas valve must be performed simultaneously, 2 sets of vacuum pump must be used at the same time to
guarantee the required vacuum degree.
Ultra Heat GMV Multi VRF_Heat Recovery Serial
Fig.30
Fig.31
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