Mitsubishi Electric CITY MULTI PUMY-P200YKM2 Installation Manual page 11

4. Installing the refrigerant piping
45°± 2°
A Flare cutting dimensions
B Flare nut tightening torque
Fig. 4-8
A (Fig. 4-8)
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
ø19.05 23.6 - 24.0
B (Fig. 4-8)
Copper pipe O.D. Flare unt O.D.
(mm)
ø6.35
ø6.35
ø9.52
ø12.7
ø12.7
ø15.88
ø15.88
ø19.05
Fig. 4-9
D
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
4.2. Connecting pipes (Fig. 4-8)
Fig. 4-1 is a sample of piping system.
• Conduct sufficient anti-condensation and insulation work to prevent water dripping
from the refrigerant piping. (liquid pipe/gas pipe)
• Increase insulation depending on the environment where the refrigerant piping
is installed, or condensation may occur on the surface of the insulation material.
(Insulation material Heat-resistant temperature: 120 °C, Thickness: 15 mm or more)
* When the refrigerant piping is used in locations subject to high temperature and
humidity such as in the attic, further addition of insulation may be required.
• To insulate the refrigerant piping, apply heat-resistant polyethylene foam between
the indoor unit and insulation material as well as to the net between the insulation
material filling all gaps.
(Condensation forming on the piping may result in condensation in the room or
burns when contacting the piping.)
• The indoor parts of the drain pipe should be wrapped with polyethylene foam insula-
tion 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
Unit series Model number
10 - 50
City Multi 63 - 140
200
15 - 42
M series or 50
S series 60
71 - 80
35 - 50
P series
60 - 100
Outdoor unit
• 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 (Ap-
plied on site).
• When usual pipe sealing is used, refer to Table 3 for flaring of R410A refrigerant
pipes.
The size adjustment gauge can be used to confirm A measurements.
Warning:
When installing the unit, securely connect the refrigerant pipes before starting
the compressor.
Note:
To connect the CONNECTION KIT (PAC-LV11M-J), refer to the installation manual
for the CONNECTION KIT.
Table 3 (Fig. 4-9)
Copper pipe O.D. (mm)
Flare tool for R410A
ø6.35
ø9.52
ø12.7
ø15.88
ø19.05
Liquid side Gas side
Pipe size (mm) Pipe size (mm)
ø6.35 ø12.7
ø9.52 ø15.88
ø9.52 ø19.05
ø6.35 ø9.52
ø6.35 ø12.7
ø6.35 ø15.88
ø9.52 ø15.88
ø6.35 ø12.7
ø9.52 ø15.88
ø9.52 ø19.05
A (mm)
Flare tool for R22·R407C
Clutch type
0 - 0.5 1.0 - 1.5
0 - 0.5 1.0 - 1.5
0 - 0.5 1.0 - 1.5
0 - 0.5 1.0 - 1.5
0 - 0.5 1.0 - 1.5
en
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