Mitsubishi Electric CITY MULTI PUMY-P112VKM Manuel D'installation page 7

4. Installing the refrigerant piping
A+a+b+c+d+e+f
L = A+f 150 m, ℓ = f 30 m
H 50 m (Outdoor lower H
h 15 m
A
L
ℓ
a b c d e
Fig. 4-1
45°± 2°
A Flare cutting dimensions
B Flare nut tightening torque
Fig. 4-2
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
B (Fig. 4-2)
Copper pipe O.D. Flare unt O.D.
(mm)
ø6.35
ø6.35
ø9.52
ø12.7
ø12.7
ø15.88
ø15.88
Fig. 4-3
A+B+C+D+a+b+c+d+e 300 m
L = A+B+C+D+e 150 m
ℓ = B+C+D+e 30 m
H 50 m (Outdoor lower H
h 15 m
A
L
ℓ
B C D e
a b c d
300 m
40 m)
A : Outdoor Unit
B : First Branch
C : Indoor unit
f D : Cap
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
A
A Die
B Copper pipe
A
PUMY-P112-140
40 m)
B, C, D
Ê Total capacity of indoor units
a, b, c, d, e, f
Ë Model number
15, 20, 25, 32, 40, 50
63, 80, 100, 125, 140
Í 4-Branching header
CMY-Y64-G-E
* When connecting the CONNECTION KIT (PAC-LV11M-J) and an M-series indoor
unit, refer to the installation manual for the CONNECTION KIT when selecting the
pipe size and piping length.
4.2. Connecting pipes (Fig. 4-2)
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. (In-
sulation 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
Gas side Pipe size (mm)
Liquid side Pipe size (mm)
• 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 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.
* To connect the CONNECTION KIT (PAC-LV11M-J), refer to the installation manual
for the CONNECTION KIT.
Table 3 (Fig. 4-3)
Copper pipe O.D. (mm)
ø6.35
ø9.52
ø12.7
ø15.88
ø19.05
È Liquid pipe É Gas pipe
ø9.52 ø15.88
È Liquid pipe É Gas pipe
ø9.52 ø15.88
È Liquid pipe É Gas pipe
ø6.35 ø12.7
ø9.52 ø15.88
Ì Branch kit model
CMY-Y62-G-E
Î 8-Branching header
CMY-Y68-G-E
Indoor unit
15-50 63-140
ø12.7 ø15.88
ø6.35 ø9.52
A (mm)
Flare tool for R410A Flare tool for R22·R407C
Clutch type
0 - 0.5
0 - 0.5
0 - 0.5
0 - 0.5
0 - 0.5
(mm)
(mm)
(mm)
Outdoor unit
112-140
ø15.88
ø9.52
1.0 - 1.5
1.0 - 1.5
1.0 - 1.5
1.0 - 1.5
1.0 - 1.5
7