Installation Of The Connection Pipe - Gree GMV-144WM/B-U Owner's Manual

GMV DC Inverter VRF
Rated capacity of indoor unit
C(Btu/h)
C≤9500
9500＜C≤17100
17100＜C≤48500
48500＜C≤72000
72000＜C

4.3 Installation of the Connection Pipe

4.3.1 Precautions when installing the connection pipe
NOTICE！
Before welding the pipeline sealing cap, please make sure there's no refrigerant in
pipeline. If welding it directly, it may cause unnecessary property damage or personal
injury.
(1) Before welding pipes and sealing caps, please release the residual pressure in the pipes.
Direct welding may lead to property loss or personal injury.
(2) Conform to the following principles during piping connection: Connection pipeline should
be as short as possible. The height difference between indoor and outdoor units should
be as short as possible. Keep number of bends as little as possible. The radius of
curvature should be as large as possible.
(3) Weld the connection pipes between indoor and outdoor unit. Please strictly conform to
the requirements for welding process. Rosin joints and pin holes are not allowable.
(4) When laying the pipes, be careful not to deform them. The radius of bending parts
should be more than 200mm(7-7/8in.). The pipes cannot be repeatedly bent or stretched,
otherwise the material will get harden. Do not bend or stretch the pipe over three times
at the same position.
(5) Please use a torque wrench to connect union nut on the indoor unit. See Fig. 4.3.1.
1) Align the expansion end of copper pipe with the center of threaded joint. Tighten the
flare nuts with your hands.
Pipe between indoor branch and IDU
Gas Pipe mm(in.)
Φ9.52(3/8)
Φ12.7(1/2)
Φ15.9(5/8)
Φ19.05(3/4)
Φ22.2(7/8)
Fig.4.3.1
23
Liquid Pipe mm(in.)
Φ6.35(1/4)
Φ6.35(1/4)
Φ9.52(3/8)
Φ9.52(3/8)
Φ9.52(3/8)