MIV V5 Heat Recovery DC Inverter R410A
DM14-01.01.18en
139
MS Unit Installation
5.4 Pipe connection
1. Flare
Use a pipe cutter to cut off the pipe.
Pull the pipe into the rear flare of the connective nut.
Outer diameter
mm
A mm
Max. Min.
Φ
6.35 8.7 8.3
Φ
9.53 12.4 12.0
Φ
12.7 15.8 15.4
Φ
15.9 19.0 18.6
Φ
19.1 23.3 22.9
2. Tighten the nut
Align with the connective pipe, screw up the connection pipe nut manually, and use a spanner to tighten it.
According to the installation conditions, too large torque will damage the flaring, and too small torque will lead
to looseness and leakage. Determine the tightening torque by reference to below table.
Liquid and gas pipes without connecting must be tightened with copper tube sealing piece.
Pipe size mm
Tightening torque N.M
Φ
6.35
14.2
～
17.2
Φ
9.53
32.7
～
39.9
Φ
12.7
49.5
～
60.3
Φ
15.9
61.8
～
75.4
Φ
19.1
97.2
～
118.6
5.5 Welding the copper pipe
Use braze-welding for the low pressure gas pipe, high pressure gas pipe, liquid pipe which connected with MS
and the outdoor unit.
During welding, use wet cloth to pack the copper pipe which near the MS.
During welding, use nitrogen gas to protect welding.
90
Burr
Slant
Coarse
R1/61~1/32inch
(0.4~0.8mm)
45 °±
2
90 °± 4
A
