Gree GMV-Pdhm1800W4/Na-M, Installation And Operating Instruction Manual

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27
Connection of Indoor and Outdoor Unit
The diameter of the piping (the main pipe) from the Outdoor Unit to the first branch joint
A. For a single-module system, the diameter of the piping from the Outdoor Unit to the first branch joint shall
be selected according to the diameter of refrigerant piping for outdoor unit. The diameter of connection pipes
for basic module outdoor unit is as below:
Piping Connections
Basic Model
Liquid
(mm)
Suction Gas
(mm)
Discharge Gas
(mm)
GMV-Pdhm224W/Na-M Φ
9.5
Φ
22.2
Φ
19.1
GMV-Pdhm280W/Na-M Φ
9.5
Φ
22.2
Φ
19.1
GMV-Pdhm335W/Na-M
Φ 12.7 Φ 28.6 Φ 19.1
GMV-Pdhm400W/Na-M Φ 12.7 Φ 28.6 Φ 22.2
GMV-Pdhm450W/Na-M Φ 12.7 Φ 28.6 Φ 22.2
B. If it is multi-module system,
The diameter of the branch piping between modules and outdoor unit shall be selected based on the
diameter of the connection pipe of basic module outdoor unit. The diameter of the connection pipe of basic
module outdoor unit is as below:
Piping Connections
Basic Model
Lquid
pipe
(mm)
Low-pressure
gas pipe
(mm)
High-pressure
gas pipe
(mm)
GMV-Pdhm224W/Na-M Φ
9.5
Φ
22.2
Φ
19.1
GMV-Pdhm280W/Na-M Φ
9.5
Φ
22.2
Φ
19.1
GMV-Pdhm335W/Na-M Φ
12.7
Φ
28.6
Φ
19.1
GMV-Pdhm400W/Na-M Φ 12.7 Φ 28.6 Φ 22.2
GMV-Pdhm450W/Na-M Φ 12.7 Φ 28.6 Φ 22.2
The diameter of the connection pipe between the branch pipes of basic module outdoor unit is as follows:
Diameter of the refrigerant piping between the branch
pipes of outdoor unit
Lquid pipe
(mm)
High-pressur
e gas pipe
(mm)
Low-pressur
e gas pipe
(mm)
450
≥
Q
Φ
12.7
Φ
28.6
Φ
28.6
960
≥
Q
＞
450
Φ 19.1 Φ 34.9 Φ 34.9
1580 ≥ Q ＞
960 Φ
22.2
Φ
41.3
Φ
41.3
Total rated
capacity Q
of upstream
outdoor unit
Q
＞
1580
Φ
25.4
Φ
41.3
Φ
54.1