Mitsubishi Electronics MSY-D30/36NA Purging PROCEDURES, Leak TEST, and Test RUN, Flare Connection

		Nut		A inch (mm)		Tightening torque
Pipe diameter
		inch	Clutch	Clutch	Wing nut		ft•lb
inch (mm)
		(mm)	type tool	type tool	type tool	N•m
							(kgf•cm)
			for R410A	for R22	for R22
ø 1/4	(6.35)	1/4				13.7 to	10 to 13
					0.06 to		(140 to
		(17)				17.7
							180)
					0.08
		3/8			(1.5 to	34.3 to	25 to 30
ø 3/8	(9.52)				2.0)
				0.04 to			(350 to
		(22)				41.2
			0 to 0.02				420)
				0.06
		1/2	(0 to 0.5)	(1.0 to		49.0 to	36 to 42
ø 1/2	(12.7)			1.5)
					0.08 to		(500 to
		(26)				56.4
							575)
					0.10
		5/8			(2.0 to	73.5 to	54 to 58
ø 5/8	(15.88)				2.5)
							(750 to
		(29)				78.4
							800)

3-2. FLARE CONNECTION

1)Cut the copper pipe as straight as possible with a pipe cutter. (Fig. 1, 2)

2)Remove all burrs from the cut section of the pipe, ensuring that precautions are taken to avoid getting metal shavings into the piping. (Fig. 3)

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4)Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension shown in the table. Select A mm from the table according to the tool you use.

5)Check

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		Good	No good
	Copper
	pipe
		Tilted	Uneven	Burred
	Fig. 1			Fig. 2
Burr	Copper pipe
	Spare reamer
		Pipe cutter
				Fig. 3
Flaring tool
		Die	Copper pipe
Clutch type	Wing nut type	Flare nut
	Fig. 4			Fig. 5
Smooth all around	Inside is shin-
	ing without any
	scratches.
Even length
all around	Fig. 6

3-3. PIPE CONNECTION

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Indoor unit connection

Connect both liquid and gas piping to indoor unit.

• Apply a thin coat of refrigerant oil (J) on the seat surface of pipe.

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• Use tightening torque table above as a guideline for indoor unit side joints, and tighten

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Outdoor unit connection

Connect pipes to stop valve pipe joint of the outdoor unit following the same procedure detailed in Indoor unit connection.

• For tightening, use a torque wrench or spanner.

3-4. INSULATION AND TAPING

1)Cover piping joints with pipe cover.

2)For outdoor unit side, insulate the piping, including valves.

3)Apply piping tape (G) starting from the connection on the outdoor unit.

•When piping has to be installed through a ceiling, closet or where the temperature

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4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN

4-1. PURGING PROCEDURES AND LEAK TEST

1)	Remove service port cap of stop valve on the side of the outdoor unit gas pipe.
2)	Connect gauge manifold valve and vacuum pump to service port of stop valve on the
	gas pipe side of the outdoor unit.
3)	Run the vacuum pump 15 minutes or more.
4)	Check the vacuum with the gauge manifold valve, then close it and shut off the vacuum
	pump.
5)	Leave as it is for one or two minutes. Make sure pointer gauge manifold valve remains
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6)	Quickly remove gauge manifold valve from service port of stop valve.
7)	After refrigerant pipes are connected and evacuated, fully open all stop valves on both
	sides of gas pipe and liquid pipe. Operating the unit without fully opening the valves
	lowers the performance and causes problems.
8)	Refer to 1-3. SPECIFICATIONS, and charge the prescribed amount of refrigerant if
	needed. Be sure to charge slowly with liquid refrigerant. Otherwise, composition of the
	refrigerant in the system may be changed and affect performance of the air conditioner.
9)	Tighten cap of service port.

*4 to 5 turns

*Close

*Open

Hexagonal wrench

Service port cap (Torque 13.7 to

17.7N•m, 140 to

180 kgf•cm)

Stop valve cap (Torque 19.6 to

29.4N•m, 200

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Stop valve for LIQUID

Handle

Low

Stop valve for

GAS

Adapter for pre- venting the back

ÀRZ

Compound pressure gauge (for R410A)

Pressure gauge (for R410A)

Gauge manifold valve (for R410A)

Handle High

Charge hose (for R410A)

Vacuum pump (or the vacuum pump with the function to SUHYHQWWKHEDFNÀRZ

10) Conduct a leak test

Precautions when using the control valve

Service port

A

Control valve

Open

Close Charge hose

Body

When attaching the control valve to the service port, valve core may deform or loosen if excess pressure is applied. This may cause gas leak.

When attaching the control valve to the service port, make sure that the valve core is in closed position, and then tighten part A. Do not tighten part A or turn the body when valve core is in open position.