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4. Installing the refrigerant piping
45° ± 2°
D
Union joint
Male side
Lock the union joint
with a wrench.
A Flare cutting dimensions
D Flare nut tightening torque
Fig. 4-1
A (Fig. 4-1)
Copper pipe O.D.
Flare dimensions
(mm)
øA dimensions (mm)
ø6.35
ø9.52
12.8 - 13.2
ø12.7
16.2 - 16.6
ø15.88
19.3 - 19.7
ø19.05
23.6 - 24.0
D (Fig. 4-1)
Copper pipe O.D.
Flare nut O.D.
(mm)
ø6.35
ø6.35
ø9.52
ø12.7
ø12.7
ø15.88
ø15.88
ø19.05
Fig. 4-2
Flare nut
Female side
Tighten the flare nut
with a torque wrench.
8.7 - 9.1
Tightening torque
(mm)
(N·m)
17
14 - 18
22
34 - 42
22
34 - 42
26
49 - 61
29
68 - 82
29
68 - 82
36
100 - 120
36
100 - 120
A
A Die
B Copper pipe
(mm)
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 110°C or more,
thickness of 12 mm or more). Direct contact with the bare piping may result in
burns on frostbite.
• Apply thin layer of refrigerant oil to pipe and joint seating surface before tightening
flare nut. A
• Apply refrigerating machine oil over the entire flare seat surface. B
• Use the flare nuts for the following pipe size. C
• For connection, first align the center, then tighten the first 3 to 4 turns of flare nut
by hand.
• Use 2 wrenches to tighten piping connections. D
• Use leak detector or soapy water to check for gas leaks after connections are
completed.
Gas side Pipe size (mm)
Liquid side Pipe size (mm)
• 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 and base plate for compres-
sor. 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)
ø6.35 (1/4")
ø9.52 (3/8")
ø12.7 (1/2")
ø15.88 (5/8")
ø19.05 (3/4")
WARNING:
When installing the unit, securely connect the refriger-
ant pipes before starting the compressor.
SWM60 - 140, SHWM60 - 140
ø12.7 or ø15.88
ø6.35
A (mm)
Flare tool for R32
Clutch type
0 - 0.5
0 - 0.5
0 - 0.5
0 - 0.5
0 - 0.5
en
14
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