Gree GMV-450WM/B-X - Part 9: Refrigerant Perfusion; Calculation Method for Perfusing Refrigerant

GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
75
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
Φ28.6
Φ25.4
Φ22.2
Φ19.05
Φ15.9
Φ12.7
Φ9.52
Φ6.35
kg/m
0.680
0.520
0.350
0.250
0.170
0.110
0.054
0.022
3. Method for calculating ∑ for the quantity of refrigerant perfused for each module (B)
Refrigerant charging amount B of every module(kg)（2）
Module capacity(kW)
IDU/ODU rated capacity collocation
ratio C （1）
Quantity of
included IDUs
22.4
28.0
33.5
40.0
45.0
50.4
56.0
61.5
50%≤C≤70%
＜4
0
0
0
0
0
0
0
0
≥4
0.5
0.5
0.5
0.5
0.5
0.5
1.0
1.5
70%＜C≤90%
＜4
0.5
0.5
1
1.5
1.5
1.5
2.0
2
≥4
1
1
1.5
2
2
2.5
3.0
3.5
90%＜C≤105%
＜4
1
1
1.5
2
2
2.5
3.0
3.5
≥4
2
2
3
3.5
3.5
4.0
4.5
5
105%＜C≤135%
＜4
2
2
2.5
3
3
3.5
4
4
≥4
3.5
3.5
4
5
5
5.5
6
6
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