Part 9 Refrigerant Perfusion; Calculation Method For Perfusing Refrigerant - Gree Ultra Heat GMV Multi VRF Heat Pump Series Service Manual

Ultra Heat GMV VRF Technical Service Manual

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 A
Added refrigerant quantity A for liquid piping = ∑Liquid pipe length × Added refrigerant quantity for
each meter (inch) of liquid pipe
28.6(1-1/8)
kg/m 0.680
OZ/inch 0.61
(2) ∑Refrigerant charging amount B of every module
Refrigerant charging amount B of every module kg(lb)
IDU/ODU rated capacity
collocation ratio C
50%≤C≤90%
90%＜C≤105%
105%＜C≤135%
For example:
The OUD is GMV-V96W/A-F(U). The IDUs are made up of 7sets of GMV-ND18PHS/A-T(U).
IDU/ODU rated capacity collocation ratio C=18×7/96=131%.The quantity of included IDUs is more
than 4 sets. Please refer to the above table.
Refrigerant charging amount B for GMV-V96W/A-F(U) module is3.5kg(7.7pounds).
Suppose the Pipeline charging amount A=25kg (55.1 pounds)
Total refrigerant charging amount R=25+3.5=28.5kg (55.1+7.7=62.8pounds).
After confirming that there is no leakage from the system and the compressor is not in operation,
charge additional R410A with specified amount to the unit through the filling opening of the liquid pipe
valve of the outdoor unit. If required additional refrigerant cannot be quickly filled for increase of pressure
in the pipe, set the unit at cooling startup and then fill the refrigerant from gas valve of outdoor unit. If
ambient temperature is low, the unit can't be set to cooling mode but heating mode.
Diameter of liquid pipe mm(inch)
25.4(1) 22.2(7/8)
0.520 0.350
0.47 0.31
Quantity of included
IDUs(N)
N＜4
N≥4
N＜4
8＞N≥4
N≥8
N＜4
8＞N≥4
N≥8
19.05(3/4) 15.9(5/8)
0.250 0.170
0.22 0.15
72
0
0.5(1.1)
0
0.5(1.1)
2(4.4)
0.5(1.1)
2.5(5.5)
4(8.8)
68
12.7(1/2) 9.52(3/8)
0.110 0.054
0.10 0.05
Rated Capacity(1000Btu/h)
INSTALLATION
6.35(1/4)
0.022
0.02
96
0
1(2.2)
0.5(1.1)
1.5(3.3)
3(6.6)
1(2.2)
3.5(7.7)
5(11.0)