Calculation Example; Liquid Pipe; Total Length Of Each Liquid Pipe - Gree GMV-24WL/C-T Service Manual

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(3) Calculation example

IDU:
IDU ①
No.
Duct type
Model GMV-ND18PLS/A-T
(U)

Liquid pipe:

No.
Pipe size
Length
No.
Pipe size
Length

Total length of each liquid pipe

Φ9.52：A+B+C+a=10+5+5+3=23m(75-1/2 feet)
Φ6.35: D+b+c+d=5+3+2+1=11m(36feet)
NOTICE! L iquid pipe that is within 20m(65-5/8feet) doesn't need to be added with refrigerant.
Therefore, the minimum quantity of additional refrigerant = (23-20)×0.054+11×0.022 ＝
0.404kg(14oz)
GMV-24WL/C-T(U) 、 GMV-28WL/C-T(U) 、 GMV-36WL/C-T(U) 、 GMV-48WL/C-T(U) 、
GMV-60WL/C-T(U)：
Quantity of additional refrigerant = ∑length of liquid pipe X quantity of additional refrigerant per
meter+（quantity of indoor unit -2）×0.3
Diameter of
Φ22.2
liquid pipe
(Φ7/8)
(mm/inch)
kg/m 0.35
oz/inch 0.314
First confirm that there is no leakage from the system. When compressor is not working, charge
additional R410A with specific amount to the unit through the filling opening of the liquid pipe valve of the
IDU ②
Duct type
GMV-ND12PLS/A-T
(U)
A
Φ9.52mm
(Φ3/8inch)
10m
(32-3/4feet)
a
Φ9.52mm
(Φ3/8inch)
3m
(9-3/4feet)
Φ19.05
(Φ3/4)
0.25
0.224
DC Inverter Side Discharge VRF Ⅱ for North America
Fig. 24
IDU ③
Duct type
GMV-ND09PLS/A-T
B
Φ9.52mm
(Φ3/8inch)
5m
(16-3/8feet)
b
Φ6.35mm
(Φ1/4inch)
3m
(9-3/4feet)
Φ15.9 Φ12.7
(Φ5/8) (Φ1/2)
0.17 0.11
0.152 0.099
82
GMV-ND09PLS/A-T
(U)
C
Φ9.52mm
(Φ3/8inch)
5m
(16-3/8feet)
c
Φ6.35mm
(Φ1/4inch)
2m
(6-5/8feet)
Φ9.52
(Φ3/8)
0.054
0.048
IDU ④
Duct type
(U)
D
Φ6.35mm
(Φ1/4inch)
5m
(16-3/8feet)
d
Φ6.35mm
(Φ1/4inch)
1m
(3-1/4feet)
Φ6.35
(Φ1/4)
0.022
0.020