Gree GMV-80WL/A-T Manual Del Propietário página 24

DC Inverter Multi VRF System User Manual
(2) Calculation of the amount of additional refrigerant
Calculation method of the quantity of additional refrigerant (based on liquid pipe)
Quantity of additional refrigerant = ∑length of liquid pipe X quantity of additional refrigerant
per meter+（quantity of indoor unit -2）×0.3
Φ22.2
0.35
First confirm that there is no leakage from the system. When compressor is not working,
charge additional R410A with specific amount to the unit through the filling opening of the liquid
pipe valve of the outdoor unit. If required amount cannot be quickly filled due to pressure
increase of the pipe, then set the unit in cooling startup and fill refrigerant from the low pressure
check valve of the outdoor unit.
(3) Calculation example
IDU
No.
Duct type
Model
GMV-ND72PL/B-T
Liquid pipe:
No.
Pipe size
Length
No.
Pipe size
Length
Total length of each liquid pipe
Φ9.52：A+B+C+a=10+5+5+3=23m
Φ6.35: D+b+c+d=5+3+2+1=11m
Quantity of indoor unit: 4 sets
Therefore, the minimum quantity of additional refrigerant = (23×0.054+11×0.022)+(4-2)
×0.3＝2.084kg
Copyright 2018. This translation is property of GREE PRODUCTS SL. All rights reserved. Total or partial reproduction without its express authorization is prohibited.
Quantity of additional refrigerant per meter for liquid pipe（kg/m）
Φ19.05
0.25
IDU ① IDU ②
Duct type
GMV-ND50PL/B-T
A
Φ9.52
10m
a
Φ9.52
3m
Φ15.9 Φ12.7
0.17 0.11
Fig. 24
IDU ③
Duct type
GMV-ND36PL/B-T
B
Φ9.52
5m
b
Φ6.35
3m
21
Φ9.52 Φ6.35
0.054 0.022
IDU ④
Duct type
GMV-ND25PL/B-T
C D
Φ9.52 Φ6.35
5m 5m
c d
Φ6.35 Φ6.35
2m 1m