Gree GMVVQ1015WM/C-X, Руководство по обслуживанию

Страница: 360 / 433

Gree GMV6 HR DC Inverter VRF Units Service Manual
358
(2) Remove the pipe fixing blocks near the connection of the four-way valve and pipeline
and the pressure vessel (gas-liquid separator, oil separator), condenser gas collection pipe,
check valve (high and low pressure gas pipe, liquid pipe), and the fixing blocks and sheet
metal brackets that fix other pipelines on four-way valves and pipelines. Prevent the pipe
fixing blocks from being burnt during welding.
(3) Use gas welding to heat up the connections between the four-way valve and pipeline
and the pressure vessel (gas-liquid separator, oil separator), condenser gas collection pipe,
and check valve (high and low pressure gas pipe, liquid pipe), and then pull out the four-way
valve and pipes, it should be filled with nitrogen for protection during welding. Refer to Table 1
for nitrogen pressure.
Table 1 Nitrogen Pressure for Pipeline Assembly Welding
Pipe diameter range
(mm)
Nitrogen pressure
range (MPa)
Pipe length (m)
Shortest pre-charge
time (s)
Shortest hysteresis
nitrogen charging time
(s)
Φ6~Φ9.52
0.01~0.05
≤2
10 10
Φ12~Φ16
0.01~0.08
≤2
15 20
Φ19~Φ2
2 0.03~0.1
≤3
30 20
Φ25~Φ28
0.03~0.1
≤3
30 30
Φ34.9~Φ41.3
0.03~0.1
≤3
35 60
Φ53.9~Φ104.8
0.03~0.1
≤3
75 400
(1) Before the 4-way valve is welded, record the direction of the 4-way valve and the
installation position of each nozzle.
Note:
When welding, wrap the surrounding components with a damp cloth carefully, and do not get
the other components burnt.
(2) Remove the old 4-way valve from the pipeline.
Installation procedure
(1) Install the new 4-way valve and pipeline to the correct position.
(2) Nitrogen protection should be applied during welding. Refer to Table 1 for nitrogen