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Photovoltaic Multi VRF
than 1m(39-3/8in.), please refer to the following table for charging amount of refrigerant. (Liquid
pipe prevails)
How much additional refrigerant should be charged
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 = ∑Liquid pipe length × Added refrigerant quantity
for each meter(in.) of liquid pipe
28.6(1-1/8)
kg/m
0.680
OZ/in.
0.61
(2) ∑Refrigerant charging amount B of every module
Refrigerant charging amount B of every module kg(Pounds)
IDU/ODU rated capacity
collocation ratio C
50%≤C≤90%
90%<C≤105%
105%<C≤135%
①
IDU/ODU rated capacity collocation ratio C = Sum of rated cooling capacity of indoor unit / Sum of rated
cooling capacity of outdoor unit
②
If all of the indoor units are fresh air indoor units, the quantity of refrigerant added to each module is 0kg.
③
If outdoor air processor is connected with normal VRF indoor unit, adopt the perfusion method for normal
indoor unit for perfusion.
For example1:
The OUD is composed of 1 module: 96kBtu/h. The IDUs are made up of 5sets of 18
kBtu/h.
IDU/ODU rated capacity collocation ratio C= 18×5/96=93.75%. The quantity of included
IDUs is more than 4 sets. Please refer to the above table.
Refrigerant charging amount B for 96 kBtu/h module is 2.0kg(4.4pounds).
Suppose the Pipeline charging amount A=Σ Liquid pipe length × refrigerant charging
amount of every 1m (or 1in.) liquid pipe=5kg (11.0 pounds)
Total refrigerant charging amount R=5+2=7kg (11.0+4.4=15.4pounds).
For example 2:
Outdoor unit is a 96kBtu/h module and the indoor unit is a 96kBtu/h fresh air unit. The
quantity (B) of refrigerant added to this module is 0kg (0pounds).
Diameter of liquid pipe mm(in.)
25.4(1)
22.2(7/8)
19.05(3/4)
0.520
0.350
0.47
0.31
Quantity of included IDUs(N)
15.9(5/8)
0.250
0.170
0.22
0.15
N<4
N≥4
N<4
8>N≥4
N≥8
N<4
8>N≥4
N≥8
23
12.7(1/2)
9.52(3/8)
0.110
0.054
0.10
0.05
Rated Capacity(1000Btu/h)
96
0
0.5(1.1)
1(2.2)
2(4.4)
3.5(7.7)
2(4.4)
3.5(7.7)
4.5(9.9)
6.35(1/4)
0.022
0.02
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