Part 9: Refrigerant Perfusion; Calculation Method For Perfusing Refrigerant - Gree GMV5 Series Service Manual

Part 9: Refrigerant Perfusion

I. Calculation Method for Perfusing
Refrigerant
Quantity of refrigerant perfused for the pipe (R) = Quantity of refrigerant perfused for the pipe (A) + ∑
Quantity of refrigerant perfused for each module (B)
1. Method for calculating the quantity of refrigerant perfused for the pipe (A):
Quantity of perfused refrigerant for the pipe (A) = ∑ Length of the liquid pipe x Quantity of perfused
refrigerant for the liquid pipe per meter
Diameter of the Liquid
Pipe
kg/m
3. Method for calculating ∑ for the quantity of refrigerant perfused for each module (B)
Refrigerant charging amount B of every module(kg)（2）
IDU/ODU rated capacity collocation
ratio C （1）
50%≤C≤70%
70%＜C≤90%
90%＜C≤105%
105%＜C≤135%
Note:
(1) Rated capacity configuration rate C for IDUs and ODUs = Sum of rated cooling capacity of IDUs/Sum
of rated cooling capacity of ODUs
(2) If all IDUs are fresh air IDUs in GMV-NX series, the quantity of refrigerant perfused for each module
(B) is 0 kg.
Examples
Example 1:
The ODU consists of modules GMV-280WM/B-X, GMV-400WM/B-X, and GMV-450WM/B-X. The IDU
consists of 8 pieces of GMV-ND140PLS/A-T.
Rated capacity configuration rate C for IDUs and ODUs = 140 x 8/(280+400+450) = 99%. The number of
IDUs is greater than 4, according to the above table,
The quantity of refrigerant perfused for module GMV-280WM/B-X (B) is 2.0kg.
The quantity of refrigerant perfused for module GMV-400WM/B-X (B) is 3.5kg.
The quantity of refrigerant perfused for module GMV-450WM/B-X (B) is 3.5kg.
Therefore,
∑ Quantity of refrigerant perfused for each module (B) = 2.0+3.5+3.5 = 9.0 kg
Assume that the quantity of refrigerant perfused for the pipe (A) = ∑ Length of the liquid pipe x Quantity
of refrigerant perfused for the liquid pipe per meter = 25 kg
Total quantity of refrigerant perfused for the system (R) = 25+9 = 34 kg
Example 2:
The ODU consists of one GMV-450WM/B-X and the IDU consists of one fresh air IDU GMV-NX450P/A
GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
Φ28.6 Φ25.4
0.680 0.520
Quantity of
included IDUs
＜4
≥4
＜4
≥4
＜4
≥4
＜4
≥4
Φ22.2 Φ19.05 Φ15.9
0.350 0.250 0.170
Module capacity(kW)
22.4 28.0 33.5
0 0 0
0.5 0.5 0.5
0.5 0.5 1
1 1 1.5
1 1 1.5
2 2 3
2 2 2.5
3.5 3.5 4
75
Φ12.7 Φ9.52
0.110 0.054
40.0 45.0 50.4 56.0
0 0 0 0
0.5 0.5 0.5 1.0
1.5 1.5 1.5 2.0
2 2 2.5 3.0
2 2 2.5 3.0
3.5 3.5 4.0 4.5
3 3 3.5 4
5 5 5.5 6
Φ6.35
0.022
61.5
0
1.5
2
3.5
3.5
5
4
6