Gree GMV5E Series Service Manual page 57

GREE
A: External Diameter of the Pipe (mm) B: Minimum Insertion Depth (mm)
Φ6.35
Φ9.52
Φ12.7
Φ15.8
Φ19.05
Φ22.2
Φ25.4
Φ28.6,
Φ31.8
Φ38.1
Φ44.5
Φ54.1
c) Bell Socket Welding
The bell socket welding is another form of socket welding. It uses the sleeve or pipe in a larger size
for welding. The insertion depth cannot be smaller than that required by socket welding.
d) Flange Connection
The pipes with large caliber and the devices are always connected by using a flange, which must be
clean and intact. Before installation, apply lubricant on the surface of the flange. Two flanges must be
symmetrical. Fasten with screws at the diagonal direction to avoid inclination.
(5) Welding Protection
Aerate with nitrogen before and during welding and keep aerating for 30 s after the welding is
finished.
Equip a pressure regulator valve to the nitrogen cylinder.
The nitrogen flow is above 4-6 L/min (pressure of 0.02 to 0.05 MPa) and must be regulated based
on the pipe caliber.
(6) Requirements on Manifold Installation
Manifolds are used to divert refrigerant. Requirements on manifold installation are as follows:
A. Ensure that the manifold is close to the IDU to reduce impact on refrigerant assignment by IDU
branches.
B. The manifold must be that specified by the manufacture and match with the devices.
C. Ensure that the manifold model is correct.
D. If the outdoor unit is connected with several indoor units, you can also adopt Y-type manifold pipe.
Please comply with the following rules when connecting T-type manifold pipe and Y-type manifold
pipe. The downstream of Y-type manifold pipe can connect with T-type manifold pipe, but the
downstream of T-type manifold pipe cannot connect with Y-type manifold pipe.
E. Y-type manifold can be laid in the following ways:
E1. Horizontal installation: The three ports must be on the same level. The shaping size and
assembly angle cannot be changed.
E2. Vertical installation: The direction can be upwards or downwards. Three ports must be on the
same elevation without inclination.
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
6
7
8
10
12
19
24
53
D-A: Gap between Pipes (mm)
0.05-0.21
0.05-0.27
0.05-0.30
0.15-0.35
0.15-0.35