Gree GMV-36WL/A-T(U) - Page 84

DC Inverter Side Discharge VRF Ⅱ for North America
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working, charge additional R410a with specific amount to the unit through the filling
opening of the liquid pipe valve of the outdoor unit. If required amount cannot be quickly
filled due to pressure increase of the pipe, then set the unit in cooling startup and fill
refrigerant from the low pressure check valve of the outdoor unit.
(3) Calculation example
Fig. 23
IDU:
No.
IDU ①
IDU ②
IDU ③
IDU ④
Model
Duct type
GMV-ND18PLS/A-
T(U)
Duct type
GMV-ND12PLS/A-T
(U)
Duct type
GMV-ND09PLS/A-T
(U)
Duct type
GMV-ND09PLS/A-T
(U)
Liquid pipe:
No.
A
B
C
D
Pipe size
Φ9.52mm
(Φ3/8inch)
Φ9.52mm
(Φ3/8inch)
Φ9.52mm
(Φ3/8inch)
Φ6.35mm
(Φ1/4inch)
Length
10m
(32-3/4feet)
5m
(16-3/8feet)
5m
(16-3/8feet)
5m
(16-3/8feet)
No.
a
b
c
d
Pipe size
Φ9.52mm
(Φ3/8inch)
Φ6.35mm
(Φ1/4inch)
Φ6.35mm
(Φ1/4inch)
Φ6.35mm
(Φ1/4inch)
Length
3m
(9-3/4feet)
3m
(9-3/4feet)
2m
(6-5/8feet)
1m
(3-1/4feet)
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! Liquid pipe that is within 20m(65-5/8 feet) 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)