Pipe Connection; Welding Protection - Gree GMV-S120WL/A-S Service Manual

insulation after installation cannot affect the pipe location and elevation. There shall not be flat
bending or corrugation on the pipe after piping.
Use angle steel support, bracket, round steel hanger, U-type pipe clip, or flat steel to fix pipes
outside the insulation layer. It is better that the insulation materials be not compressed to ensure
good insulation.
The style and workmanship of supports, hangers, and brackets must follow the standard T616
HVAC Systems Design Handbook.
The minimum distance between supports, hangers, and brackets is listed in the table below:
The pipe led through a wall or beam must be fixed by a support, hanger, or bracket on both
ends at the position 300 mm away from the hole.

9.5.1.2.4 Pipe connection

1）Flaring connection:
The refrigerant pipes and IDUs are connected by using the flare opening. Therefore, the
quality of flaring connection must be ensured. The flaring depth of the bell mouth cannot be
smaller than the caliber. The flaring direction must face towards the direction of medium flow. Use
two torque wrenches to fasten the connection.
2）Socket welding:
The gap between socket components should be proper to ensure that the connection will not
loose from the friction surface. The flaring direction of the socket component must face towards
the direction of medium flow .During pipe connect, protect the braze welding part according the
length specified below:
A: External Diameter of the
Pipe (mm)
ф6.35
ф9.52
ф12.7
ф15.8
Ф19.05
ф22.2
ф25.4
ф28.6,
ф31.8
ф38.1
ф44.5
ф54.1
3）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.
4）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.

9.5.1.2.5 Welding protection

Aerate with nitrogen before and during welding and keep aerating for 30 s after the welding is
GMV5 Home DC Inverter Multi VRF Units
External Diameter
ф≤16
of the Pipe (mm)
Distance between
Horizontal Pipes 1000
(mm)
Distance between
Vertical Pipes 1500
(mm)
B: Minimum Insertion Depth (mm)
40＞ф≥19.05
1500
2000
D-A: Gap between Pipes (mm)
6
7
8
10
12
19
24
154
ф≥40
2000
2500
0.05～0.21
0.05～0.27
0.05～0.30
0.15～0.35
0.15～0.35