90
°
±
0.5
°
øA
R0.4~R0.8
45
°±
2
°
90°
±
0.5
°
øA
R0.4 - R0.8
45°± 2 °
8
4.2. Connecting pipes (Fig. 4-1)
• When commercially available copper pipes are used, wrap liquid and gas pipes
with commercially available insulation materials (heat-resistant to 100°C or more,
thickness of 12 mm or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam
insulation materials (specific gravity of 0.03, thickness of 9 mm or more).
• Apply thin layer of refrigerant oil to pipe and joint seating surface before tightening
flare nut.
A
• Use two wrenches to tighten piping connections.
B
• Use leak detector or soapy water to check for gas leaks after connections are
completed.
• Apply refrigerating machine oil over the entire flare seat surface.
C
• Use the flare nuts for the following pipe size.
D
ZM35, 50
ZM60, 71
Gas side
Pipe size (mm)
ø12.7
ø15.88
Liquid side
Pipe size (mm)
ø6.35
ø9.52
• When bending the pipes, be careful not to break them. Bend radii of 100 mm to
150 mm are sufficient.
• Make sure the pipes do not contact the compressor. Abnormal noise or vibration
may result.
1
Pipes must be connected starting from the indoor unit.
Flare nuts must be tightened with a torque wrench.
2
Flare the liquid pipes and gas pipes and apply a thin layer of refrigeration oil (Ap-
plied on site).
• When usual pipe sealing is used, refer to Table 1 for flaring of R32 refrigerant
pipes.
The size adjustment gauge can be used to confirm A measurements.
Table 1 (Fig. 4-2)
Copper pipe O.D.
(mm)
A (mm)
Flare tool for R32
Flare tool for R22·R407C
Clutch type
ø6.35 (1/4")
0 - 0.5
1.0 - 1.5
ø9.52 (3/8")
0 - 0.5
1.0 - 1.5
ø12.7 (1/2")
0 - 0.5
1.0 - 1.5
ø15.88 (5/8")
0 - 0.5
1.0 - 1.5
ø19.05 (3/4")
0 - 0.5
1.0 - 1.5
3
Use the following procedure for connecting the gas-side piping. (Fig. 4-3)
1 Braze the
E
Joint pipe provided to the outdoor unit using locally procured brazing
materials and
C
Local piping without oxygen.
2 Connect the
E
Joint pipe to the gas-side Stop valve.
Use 2 wrenches to tighten the flare nut.
* If order is reversed, refrigerant leak occurs because of the part damaging by
brazing fire.
A
(Fig. 4-1)
Copper pipe O.D.
(mm)
Flare dimensions øA
dimensions (mm)
ø6.35
8.7 - 9.1
ø9.52
12.8 - 13.2
ø12.7
16.2 - 16.6
ø15.88
19.3 - 19.7
ø19.05
23.6 - 24.0
B
(Fig. 4-1)
Copper pipe O.D.
(mm)
Flare nut O.D.
(mm)
Tightening torque
(N·m)
ø6.35
17
14 - 18
ø6.35
22
34 - 42
ø9.52
22
34 - 42
ø12.7
26
49 - 61
ø12.7
29
68 - 82
ø15.88
29
68 - 82
ø15.88
36
100 - 120
ø19.05
36
100 - 120
A
Flare cutting dimensions
B
Flare nut tightening torque
A
B
C
A
Die
B
Copper pipe
A
B
A
4. Installing the refrigerant piping
Fig. 4-3
Fig. 4-2
Fig. 4-1
A
B
C
D
E
F
A
Stop valve
B
Seal section
C
Local piping
D
Double spanner section
E
Joint pipe
F
Pipe cover
D
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