Mitsubishi Electric CITY MULTI PUMY-P NKMU Series Installation Manual page 6

4. Installing the refrigerant piping
A
a
B
C
A+a+b+c+d 150 m [492 ft]
L = A+d 80 m [262 ft],
H 50 m [164 ft] (Outdoor lower H 40 m [131 ft])
h 12 m [39 ft]
A
L
ℓ
B
a b c
C C
C
Fig. 4-1
A
45° ±2°
A Flare cutting dimensions
B Flare nut tightening torque
Fig. 4-2
A (Fig. 4-2)
Flare dimensions
Copper pipe O.D.
øA dimensions
ø6.35 [1/4] 8.7 - 9.1 [11/32-23/64]
ø9.52 [3/8] 12.8 - 13.2 [1/2-33/64]
ø12.7 [1/2] 16.2 - 16.6 [41/64-21/32]
ø15.88 [5/8] 19.3 - 19.7 [49/64-25/32]
ø19.05 [3/4] 23.6 - 24.0 [15/16-61/64]
B (Fig. 4-2)
Copper pipe O.D. Flare nut O.D.
(mm [inch]) (mm [inch])
ø6.35 [1/4]
ø6.35 [1/4]
ø9.52 [3/8]
ø12.7 [1/2] 26 [1-3/64]
ø12.7 [1/2] 29 [1-9/64]
ø15.88 [5/8] 29 [1-9/64]
ø15.88 [5/8] 36 [1-27/64]
ø19.05 [3/4] 36 [1-27/64]
A
Fig. 4-3
6
A+B+C+a+b+c+d 150 m [492 ft]
L = A+B+C+d 80 m [262 ft]
ℓ
= B+C+d 30 m [100 ft]
H 50 m [164 ft] (Outdoor lower H 40 m [131 ft])
h 12 m [39 ft]
L
ℓ
B C d
b c
C C
C
ℓ
= d 30 m [100 ft]
A : O utdoor Unit
B : First Branch
C : Indoor unit
d
C
(inch)
B
C
D
(mm [inch])
Tightening torque
(N·m [ft·lbs])
17 [43/64] 14 - 18 [10-13]
22 [7/8] 34 - 42 [25-30]
22 [7/8] 34 - 42 [25-30]
49 - 61 [35-44]
68 - 82 [49-59]
68 - 82 [49-59]
100 - 120 [71-87]
100 - 120 [71-87]
A
A Die
B Copper pipe
B
A
A Liquid pipe
PUMY
B, C, D
C Total capacity of indoor units
a, b, c, d, e, f
D Model number
P06, P08, P12, P15, P18
P24, P30, P36, P48, P54
P72
E Branch kit model
CMY-Y62-G-E
F 4-Branching header
CMY-Y64-G-E
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.
(Insulation material Heat-resistant temperature: 120 °C [248 °F], Thickness: 15 mm
[19/32 inch] 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 [23/64 inch] 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
P06-P18
Gas side Pipe size ø12.7 [1/2] ø15.88 [5/8] ø19.05 [3/4] ø19.05 [3/4]
Liquid side Pipe size ø6.35 [3/8]
• When bending the pipes, be careful not to break them. Bend radius of 100 mm
[3-15/16 inch] to 150 mm [5-27/32 inch] 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 1 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.
Table 1 (Fig. 4-3)
Copper pipe O.D.
(mm [inch])
ø6.35 [1/4]
ø9.52 [3/8]
ø12.7 [1/2]
ø15.88 [5/8]
ø19.05 [3/4]
(mm [inch])
B Gas pipe
ø9.52 [3/8] ø19.05 [3/4]
(mm [inch])
A Liquid pipe B Gas pipe
ø9.52 [3/8] ø19.05 [3/4]
(mm [inch])
A Liquid pipe B Gas pipe
ø6.35 [1/4] ø12.7 [1/2]
ø9.52 [3/8] ø15.88 [5/8]
ø9.52 [3/8] ø19.05 [3/4]
G 8-Branching header
CMY-Y68-G-E
(mm [inch])
Indoor unit Outdoor unit
P24-P54 P72
ø9.52 [3/8] ø9.52 [3/8] ø9.52 [3/8]
A (mm [inch])
Clutch type
1.0 - 1.5 [3/64-1/16]
1.0 - 1.5 [3/64-1/16]
1.0 - 1.5 [3/64-1/16]
1.0 - 1.5 [3/64-1/16]
1.0 - 1.5 [3/64-1/16]
P60