Mitsubishi Electronics R410A Connecting pipes Fig, Installing the refrigerant piping

4. Installing the refrigerant piping

H

A+B+C+a+b+c+d = 120 m [394 ft]

A

(mm [inch])

L = A+B+C+d = 80 m [262 ft]

Å Liquid pipe

ı Gas pipe

R= B+C+d = 30 m [100 ft]

PUMY

ø9.52 [3/8]

ø15.88 [5/8]

H =

30 m [100 ft] (Outdoor lower H = 20 m [70 ft])

B, C, D

(mm [inch])

h = 12 m [39 ft]

A

L

Ç Total capacity of indoor units

Å Liquid pipe

ı Gas pipe

ø9.52 [3/8]

ø15.88 [5/8]

H

r

a, b, c, d, e, f

(mm [inch])

B

C

d

B

Î Model number

Å Liquid pipe

ı Gas pipe

a

b

c

P06, P08, P12, P15, P18

ø6.35 [1/4]

ø12.7 [1/2]

C

C

C

P24, P30, P36, P48, P54

ø9.52 [3/8]

ø15.88 [5/8]

h

C

‰ Branch kit model

A+a+b+c+d = 120 m [394 ft]

CMY-Y62-G-E

L = A+d = 80 m [262 ft], R= d = 30 m [100 ft]

H = 30 m [100 ft] (Outdoor lower H = 20 m [70 ft])

Ï 4-Branching header

Ì 8-Branching header

h = 12 m [39 ft]

CMY-Y64-G-E

CMY-Y68-G-E

A

L

A : Outdoor Unit

B

r

B : First Branch

C: Indoor unit

		a		b		c		d
	C		C
					C
h
	C

Fig. 4-1

A	45°±2°	B	(inch)
° ±0.5°	øA
90

AFlare cutting dimensions B Flare nut tightening torque

C

D

		Fig. 4-2
A (Fig. 4-2)				(mm [inch])
Copper pipe O.D.		Flare dimensions
		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.				Tightening torque
(mm [inch])		(mm [inch])				(N·m [ft·lbs])
ø6.35 [1/4]	17 [43/64]					14	- 18 [10-13]
ø6.35 [1/4]	22 [7/8]					34	- 42 [25-30]
ø9.52 [3/8]	22 [7/8]					34	- 42 [25-30]
ø12.7 [1/2]	26 [1-3/64]					49	- 61 [35-44]
ø12.7 [1/2]	29 [1-9/64]					68	- 82 [49-59]
ø15.88 [5/8]	29 [1-9/64]					68	- 82 [49-59]
ø15.88 [5/8]	36 [1-27/64]					100	- 120 [71-87]
			A
					A Die
					B Copper pipe

A

B

Fig. 4-3

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 insu- lation 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 com- pleted.

•Apply refrigerating machine oil over the entire flare seat surface. C

•Use the flare nuts for the following pipe size. D

				(mm [inch])
		Indoor unit		Outdoor unit
		P06-P18	P24-P54	P48
Gas side	Pipe size	ø12.7 [1/2]	ø15.88 [5/8]	ø15.88 [5/8]
Liquid side	Pipe size	ø6.35 [3/8]	ø9.52 [3/8]	ø9.52 [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.

1Pipes must be connected starting from the indoor unit.

Flare nuts must be tightened with a torque wrench.

2Flare 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.

Table 1 (Fig. 4-3)

Copper pipe O.D.	A (mm [inch])
(mm [inch])	Clutch type
ø6.35 [1/4]	1.0 - 1.5 [3/64-1/16]
ø9.52 [3/8]	1.0 - 1.5 [3/64-1/16]
ø12.7 [1/2]	1.0 - 1.5 [3/64-1/16]
ø15.88 [5/8]	1.0 - 1.5 [3/64-1/16]

6