OPERATING INSTALLATION MANUAL FOR AHU-KIT UNIT
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4.2 Piping Installation
4.2.1 Diagram of Piping Connection
Fig.4.2
(1) Air handling unit
(2) Connection pipe from expansion valve kit to air handling unit
(3) Valve kit
(4) Liquid pipe
(5) Gas pipe
Notes:
A: When the air handling unit is installed at the top of the EXV box, vertical distance between
the bottom of the air handling unit to the EXV box is no more than 2 m; if the air handling unit is
installed under the EXV box, vertical distance between the bottom of the air handling unit to the
EXV box is no more than 2 m.
L: The length of liquid pipe between the air handling unit to EXV box is no more than 2 m.
L is to be considered as a part of the total maximum piping length. See installation manual of
the outdoor unit for piping installation.
4.2.2 Piping Connections
Make sure to install gas and liquid pipe diameters in function of the air handling unit capacity
class.
Model
Capacity(kW)
Gas pipe(mm)
Connection pipe
Liquid pipe(mm)
GMV-N140U/A-T
9.0
Φ15.9
Φ9.52
11.2
Φ15.9
Φ9.52
14.0
Φ15.9
Φ9.52
GMV-N280U/A-T
22.4
Φ19.05
Φ9.52
28.0
Φ22.2
Φ9.52
GMV-N560U/A-T
45.0
Φ28.6
Φ12.7(*)
50.4
Φ28.6
Φ15.9
56.0
Φ28.6
Φ15.9
(*)Note:
The internal diameter of both inlet tube and outlet tube of EXV box for
GM
V-N560U/A-T is
Φ16.3mm. It needs engineering treatment on the scene if you want to connect liquid pipe of
Φ12.7mm( expanding the copper tube of Φ12.7mm or using a connection copper tube) in order to
