Gree Ultra Heat GMV-VQ72W/A-F, Service Manual

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Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial INSTALLATION
80
PART 9 REFRIGERANT PERFUSION
1 CALCULATION METHOD FOR PERFUSING REFRIGERANT
Outdoor unit has been charged refrigerant before delivery.
If field-installed connecting pipeline is longer than 1m(39-3/8inch), please refer to the following table
for charging amount of refrigerant. (Liquid pipe prevails)
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 = Added refrigerant quantity A1 for liquid piping + Added
refrigerant quantity A2 for high pressure gas piping
Added refrigerant quantity A1 for liquid piping = ∑Liquid pipe length × Added refrigerant quantity for
each meter (inch) of liquid pipe
Diameter of liquid pipe mm(inch)
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/inch 0.61 0.47 0.31 0.22 0.15 0.10 0.05 0.02
Added refrigerant quantity A2 for high pressure gas piping = ∑high pressure gas pipe length ×
Added refrigerant quantity for each meter (inch) of high pressure gas pipe
Diameter of high pressure gas pipe mm(inch)
28.6(1-1/8) 25.4(1) 22.2(7/8) 19.05(3/4) 15.9(5/8) 12.7(1/2)
kg/m 0.054 0.046 0.032 0.024 0.017 0.009
OZ/inch 0.048 0.041 0.029 0.022 0.015 0.008
Note: high pressure gas pipe lengths means all the lengths between ODU and mode exchangers.
(2) ∑Refrigerant charging amount B of every module
Refrigerant charging amount B of every module kg(lb) Rated Capacity(1000Btu/h)
IDU/ODU rated capacity
collocation ratio C
Quantity of included
IDUs(N)
72 96
50%≤C≤90%
N
＜
4
0 0
N
≥
4
0.5(1.1) 1(2.2)
90%
＜
C≤105%
N
＜
4
0 0.5(1.1)
8
＞
N
≥
4
0.5(1.1) 1.5(3.3)
N
≥
8
2(4.4) 3(6.6)
105%
＜
C≤135%
N
＜
4
0.5(1.1) 1(2.2)
8
＞
N
≥
4
2.5(5.5) 3.5(7.7)
N
≥
8
4(8.8) 5(11.0)
For example 1:
The OUD is GMV-VQ192WM/A-F(U) including GMV-VQ96W/A-F(U) and GMV-VQ96W/A-F(U). The
IDUs are made up of 10 sets of GMV-ND18PHS/A-T(U).