Mitsumi electronic PLA-ABA Installing the refrigerant piping, Precautions, Connecting pipes Fig

4. Installing the refrigerant piping

45 2

0.5	A
90

Fig. 4-1

Flare cutting dimensions

Copper pipe O.D.	Flare dimensions
(mm, inch)	A dimensions (mm, inch)
6.35, 1/4	8.7	- 9.1, 11/32 - 23/64
9.52, 3/8	12.8 - 13.2, 1/2 - 33/64
12.7, 1/2	16.2	- 16.6, 41/64 - 21/32
15.88, 5/8	19.3	- 19.7, 49/64 - 25/32
19.05, 3/4	23.6	- 24.0, 15/16 - 61/64

B

Die

Copper pipe

Fig. 4-2

Copper pipe O.D.		B (mm, inch)
		Flare tool for R410A
mm (inch)
		Clutch type
6.35	(1/4")	1.0 - 1.5, 3/64 - 1/16
9.52	(3/8")	1.0 - 1.5, 3/64 - 1/16
12.7	(1/2")	1.0 - 1.5, 3/64 - 1/16
15.88	(5/8")	1.0 - 1.5, 3/64 - 1/16
19.05	(3/4")	1.0 - 1.5, 3/64 - 1/16

4.1. Precautions

For devices that use R410A refrigerant

•Use ester oil, ether oil or alkylbenzene oil (small amount) as the refrigera- tion oil applied to the flared sections.

•Use C1220 copper phosphorus for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses specified in the table below. Make sure the insides of the pipes are clean and do not contain any harmful contaminants such as sulfuric compounds, oxidants, debris, or dust.

Warning:

When installing or moving the air conditioner, use only the specified refriger- ant (R410A) to charge the refrigerant lines. Do not mix it with any other refrig- erant and do not allow air to remain in the lines. Air enclosed in the lines can cause pressure peaks resulting in a rupture and other hazards.

	A12, A18	A24, A30, A36, A42
Liquid pipe	ø6.35 mm, ø1/4 inch	ø9.52 mm, ø3/8 inch
	thickness 0.8mm, 1/32 inch	thickness 0.8mm, 1/32 inch
Gas pipe	ø12.7 mm, ø1/2 inch	ø15.88 mm, ø5/8 inch
	thickness 0.8mm, 1/32 inch	thickness 1.0mm, 3/64 inch

• Do not use pipes thinner than those specified above.

4.2. Connecting pipes (Fig. 4-1)

•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 insulation materials (specifi c 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 tighten- ing fl are nut.

•Use two wrenches to tighten piping connections.

•Use refrigerant piping insulation provided to insulate indoor unit connections. In- sulate carefully.

Flare nut tightening torque

Copper pipe O.D.	Flare nut O.D.	Tightening torque
(mm, inch)	(mm, inch)	(N-m, ftlbs)
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, 71-86
ø19.05, 3/4	36, 1-27/64	100-120, 71-86

Apply refrigerating machine oil over the entire fl are seat surface.

Use correct fl are nuts meeting the pipe size of the outdoor unit.

Available pipe size

	A12, A18	A24, A30, A36, A42
Liquid side	ø6.35	ø9.52
Gas side	ø12.7	ø15.88

: Factory fl are nut attachment to the heat exchanger.

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