Calculation Of Additional Refrigerant Charge Amount; Example Of Calculation - Gree GMV-S120WL/A-S Service Manual

13.2 Calculation of Additional Refrigerant Charge Amount

13.2.1 Constitution of additional refrigerant charge
Additional refrigerant charge amount = additional refrigerant charge of liquid pipe ×additional
refrigerant charge of hydro box + additional refrigerant charge of high pressure gas pipe
（1）Additional refrigerant charge of liquid pipe
Additional refrigerant charge of liquid pipe(kg)=∑length of liquid pipe × refrigerant charge
amount of every meter of liquid pipe.
φ28.6 φ25.4
0.680 0.520
Note:
① Liquid pipe includes the liquid pipe which ODU connects IDU and the liquid pipe which
ODU connects hydro box.
② For GMV-S120WL/A-S, GMV-S140WL/A-S, GMV-S160WL/A-S, if the total liquid pipe
length is within 20m, no additional refrigerant charge is needed.
（2）Additional refrigerant charge of hydro box
Additional refrigerant charge of hydro box(kg)=0.3*quantity of hydro box
（3）Additional refrigerant charge of high pressure gas pipe
Additional refrigerant charge of high pressure gas pipe(kg)=Σlength of high pressure pipe ×
refrigerant charge amount of every meter of high pressure pipe.
Refrigerant charge amount of every meter of high pressure pipe(kg/m)
φ19.05
0.15
Note: High pressure pipe includes the high pressure pipe which ODU connects hydro
box.

13.2.2 Example of calculation

Top discharge GMV-S280W/A-X is taken for example (three sets of indoor unit
GMV-NHD90PLS/ES are connected and two sets of hydro box NRQD16G/A-S are connected:
GMV5 Home DC Inverter Multi VRF Units
Refrigerant charge amount of every meter of liquid pipe(kg/m)
φ22.2 φ19.05
0.350 0.250
φ15.9
0.12
φ15.9 φ12.7
0.170 0.110
φ12.7
0.09
192
φ9.52 φ6.35
0.054 0.022
φ9.52
0.05