GREE Photovoltaic Direct-driven Inverter Multi VRF Units
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9.2.2.2 Precautions:
(1) The gas pipe and liquid pipe must be vacuumized at the same time.
(2) Turn off the valve before powering off the vacuum pump.
(3) Keep vacuuming for 2 hours. The vacuum meets the requirement if the pressure displayed by
the vacuum gauge does not increase.
(4) The units parallel connected to the module and oil-equalizing pipe also need to be vacuumized.
10 REFRIGERANT PERFUSION
10.1 Calculation Method for Perfusing Refrigerant
Outdoor unit has been charged refrigerant before delivery.
Charge additional refrigerant for field-installed connecting pipe. If the pipeline is longer than
1m(39-3/8in.), please refer to the following table for charging amount of refrigerant. (Liquid pipe prevails)
How much additional refrigerant should be charged.
Total refrigerant charging amount R= Pipeline charging amount A + ∑charging amount B of every
module.
(1) Pipeline charging amount
Added refrigerant quantity A for piping = ∑Liquid pipe length × Added refrigerant quantity for each
meter(in.) of liquid pipe.
Diameter of liquid pipe mm(in.)
28.6(1-1/8) 25.4(1) 22.2(7/8) 19.05(3/4) 15.9(5/8) 12.7(1/2) 9.52(3/8) 6.35(1/4)
kg/m 0.680 0.520 0.350 0.250 0.170 0.110 0.054 0.022
OZ/in. 0.61 0.47 0.31 0.22 0.15 0.10 0.05 0.02
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