6
4.2. Connecting pipes (Fig. 4-2)
Fig. 4-1 is a sample of piping system.
• 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 insu-
lation 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 com-
pleted.
• Apply refrigerating machine oil over the entire flare seat surface.
C
• Use the flare nuts for the following pipe size.
D
Indoor unit
Outdoor unit
20-50
63-140
100-140
Gas side
Pipe size (mm)
ø12.7
ø15.88
ø15.88
Liquid side
Pipe size (mm)
ø6.35
ø9.52
ø9.52
• When bending the pipes, be careful not to break them. Bend radius of 100 mm to
150 mm is 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
(Applied on site).
• When usual pipe sealing is used, refer to Table 1 for flaring of R410A refrigerant
pipes.
The size adjustment gauge can be used to confirm A measurements.
A
(mm)
Å
Liquid pipe
ı
Gas pipe
PUMY-P100-140
ø9.52
ø15.88
B, C, D
(mm)
Ç
Total capacity of indoor units
Å
Liquid pipe
ı
Gas pipe
ø9.52
ø15.88
a, b, c, d, e, f
(mm)
Î
Model number
Å
Liquid pipe
ı
Gas pipe
20, 25, 32, 40, 50
ø6.35
ø12.7
63, 80, 100, 125, 140
ø9.52
ø15.88
‰
Branch kit model
CMY-Y62-G-E
Ï
4-Branching header
Ì
8-Branching header
CMY-Y64-G-E
CMY-Y68-G-E
A
Flare cutting dimensions
B
Flare nut tightening torque
90
°
±
0.5
°
ø
A
R0.4~R0.8
A
45
°±
2
°
B
C
D
A
Die
B
Copper pipe
Fig. 4-2
A
A
B
Fig. 4-3
A
(Fig. 4-2)
Copper pipe O.D.
Flare dimensions
(mm)
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
Copper pipe O.D.
Flare nut O.D.
Tightening torque
(mm)
(mm)
(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
B
(Fig. 4-2)
Copper pipe O.D.
A (mm)
(mm)
Flare tool for R410A
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
Table 1 (Fig. 4-3)
4. Installing the refrigerant piping
B
A
H
B
C
L
r
D
e
a
h
b
c
d
C
C
C
C
C
B
A
a
b
c
d
C
D
C
C
C
C
C
e
f
H
h
L
r
A
: Outdoor Unit
B
: First Branch
C
: Indoor unit
D
: Cap
A+B+C+D+a+b+c+d+e
=
120m
L = A+B+C+D+e
=
80m
R
= B+C+D+e
=
30m
H
=
30m (Outdoor lower H
=
20m)
h
=
12m
A+a+b+c+d+e+f
=
120m
L = A+f
=
80m,
R
= f
=
30m
H
=
30m (Outdoor lower H
=
20m)
h
=
12m
Fig. 4-1
