Mitsubishi PUMY-P NHMU-BS Installation Manual page 6

4. Installing the refrigerant piping
A
B
a
C
A+a+b+c+d 120 m [394 ft]
L = A+d 80 m [262 ft],
H 30 m [100 ft] (Outdoor lower H
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]
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]
A
Fig. 4-3
6
A+B+C+a+b+c+d 120 m [394 ft]
L = A+B+C+d 80 m [262 ft]
ℓ
= B+C+d 30 m [100 ft]
H 30 m [100 ft] (Outdoor lower H 20 m [70 ft])
h 12 m [39 ft]
L
ℓ
d
B C
b c
C C
C
ℓ
= d 30 m [100 ft]
20 m [70 ft])
A : Outdoor 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]
A
A Die
B Copper pipe
B
A
PUMY
B, C, D
Total capacity of indoor units
a, b, c, d, e, f
Model number
P06, P08, P12, P15, P18
P24, P30, P36, P48, P54
Branch kit model
CMY-Y62-G-E
4-Branching header
CMY-Y64-G-E
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 [212°F]
or more, thickness of 12 mm [1/2 inch] or more).
• 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
Gas side Pipe size
Liquid side Pipe size
• 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
(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.
Warning:
When installing the unit, securely connect the refrigerant pipes before start-
ing 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]
(mm [inch])
Liquid pipe Gas pipe
ø9.52 [3/8] ø15.88 [5/8]
(mm [inch])
Liquid pipe Gas pipe
ø9.52 [3/8] ø15.88 [5/8]
(mm [inch])
Liquid pipe Gas pipe
ø6.35 [1/4] ø12.7 [1/2]
ø9.52 [3/8] ø15.88 [5/8]
8-Branching header
CMY-Y68-G-E
(mm [inch])
Indoor unit Outdoor unit
P06-P18 P24-P54
ø12.7 [1/2] ø15.88 [5/8] ø15.88 [5/8]
ø6.35 [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]
P48