Cooper & Hunter Alpha NG Series, Owner'S Manual

Page: 17 / 156

Refrigerant piping connection
1. Flaring work
Main cause for refrigerant leakage is due to defect in the flaring work. Carry out
correct flaring work using the following procedure:
A: Cut the pipes and the cable.
1. Use the piping kit accessory or pipes purchased locally.
2. Measure the distance between the indoor and the outdoor unit.
3. Cut the pipes a little longer than the measured distance.
4. Cut the cable 1.5m longer than the pipe length.
B: Burr removal
1. Completely remove all burrs from the cut cross section of pipe/tube.
2. Put the end of the copper tube/pipe in a downward direction as you remove burrs
in order to avoid dropping burrs into the tubing.
C: Putting nut on
Remove flare nuts attached to indoor and outdoor unit, and then put them on pipe/tube having completed burr removal. (Not
possible to put them on after flaring work).
D: Flaring work
Firmly hold copper pipe in a die in the dimension shown in the table below.
Outer dia m . (m m )
A (m m )
M a x. M in
Φ 6,35
Φ 9,52
Φ 12,7
Φ 16
1,3
1,6
1,8
2
0,7
1
1
1
Tightening Connection
●
Align the center of the pipes.
●
Sufficiently tighten the flare nut with fingers, and then tighten it with a spanner
and torque wrench as shown.
CAUTION:
●
Excessive torque can break nut depending on installation conditions.
Hex nut diam. (mm) Tightening torque (N.m)
Φ 6,35
Φ 9,52
Φ 12,7
Φ 16
1 5 ~ 20
3 1 ~ 35
5 0 ~ 55
6 0 ~ 65
Pipe
1
4