Refrigerant Pipe Installation - Midea MOBA30U-12HN1-Q Service Manual

DM17-01.01.08en

5. Refrigerant pipe installation

5.1 Maximum pipe length and height drop
Considering the allowable pipe length and height drop to decide the installation position. Make sure the
distance and height drop between indoor and outdoor unit not exceeded the date in the following table.
Capacity
12,000Btu/h
18,000Btu/h~24,000Btu/h
36,000Btu/h
48,000Btu/h~60,000Btu/h
5.2 The procedure of connecting pipes
5.2.1 Choose the pipe size according to the specification table.
5.2.2 Confirm the cross way of the pipes.
5.2.3 Measure the necessary pipe length.
5.2.4 Cut the selected pipe with pipe cutter
Make the section flat and smooth.

5.2.5 Insulate the copper pipe
 Before test operation, the joint parts should not be heat insulated.
5.2.6 Flare the pipe
 Insert a flare nut into the pipe before flaring the pipe
 According to the following table to flare the pipe
Pipe diameter
1/4" (6.35)
3/8" (9.52)
1/2" (12.7)
5/8" (15.9)
3/4" (19)
 After flared the pipe, the opening part must be seal by end cover or adhesive tape to avoid duct or
exogenous impurity come into the pipe.
5.2.7 Drill holes if the pipes need to pass the wall.
5.2.8 According to the field condition to bend the pipes so that it can pass the wall smoothly.
5.2.9 Bind and wrap the wire together with the insulated pipe if necessary.
5.2.10 Set the wall conduit
156
Lean
Flare dimension A (mm)
Min Max
8.3 8.7
12.0 12.4
15.4 15.8
18.6 19.1
22.9 23.3
Max. Length
15m
25m
30m
50m
Crude Burr
Light Commercial R410A on-off
Max. Elevation
8m
15m
20m
30m
Flare shape
- +
90 ° 4
A
R0.4~0.8