Gree GMV-24WL/C-T, Service Manual

Page: 85 / 150

GREE DC Inverter Side Discharge VRF
Ⅱ
for North America
82
(3) Calculation example
Fig. 24
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! 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
liquid pipe
(mm/inch)
Φ22.2
(Φ7/8)
Φ19.05
(Φ3/4)
Φ15.9
(Φ5/8)
Φ12.7
(Φ1/2)
Φ9.52
(Φ3/8)
Φ6.35
(Φ1/4)
kg/m 0.35 0.25 0.17 0.11 0.054 0.022
oz/inch 0.314 0.224 0.152 0.099 0.048 0.020
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