Mitsubishi Electronics MXZ-2A20NA Flaring Work and Pipe Connection, Insulation and Taping

3. FLARING WORK AND PIPE CONNECTION

3-1. FLARING WORK

1)Cut the copper pipe correctly with pipe cutter. (Fig. 1, 2)

2)Completely remove all burrs from the cut cross section of pipe. (Fig. 3)

•Put the end of the copper pipe to downward direction as you remove burrs in order to avoid to let burrs drop in the piping.

3)Remove flare nuts attached to indoor and outdoor units, then put them on pipe having completed burr removal. (Not possible to put them on after flaring work.)

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

•Compare the flared work with Fig. 6.

•If flare is noted to be defective, cut off the flared section and do flaring work again.

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

Pipe diameter		Nut		A [mm (inch)]		Tightening torque
[mm (inch)]		(mm)	Clutch type tool	Clutch type tool	Wing nut type tool	N•m	kgf•cm	ft·Ib
			for R410A	for R22	for R22
ø6.35	(1/4)	17			1.5 to 2.0	13.7 to 17.7	140 to 180	10 to 13
ø9.52	(3/8)	22	0 to 0.5	1.0 to 1.5	(0.06 to 0.08)	34.3 to 41.2	350 to 420	25 to 30
ø12.7	(1/2)	26	(0. to 0.02)	(0.04 to 0.06)	2.0 to 2.5	49.0 to 56.4	500 to 575	36 to 42
ø15.88	(5/8)	29			(0.08 to 1.0)	73.5 to 78.4	750 to 800	54 to 58

3-2. PIPE CONNECTION

•Fasten flare nut with a torque wrench as specified in the table.

•When fastened too tight, flare nut may brake after a long period and

cause refrigerant leakage.

Outdoor unit connection

Connect pipes to stop valve pipe joint of the outdoor unit in the same manner applied for indoor unit.

•For tightening, use a torque wrench or spanner and use the same tightening torque applied for indoor unit.

3-3. INSULATION AND TAPING

1)Cover piping joints with pipe cover.

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

3)Using piping tape (E), apply taping starting from the entry of outdoor unit.

•Stop the end of piping tape (E) with tape (with adhesive agent at- tached).

•When piping have to be arranged through above ceiling, closet or where the temperature and humidity are high, wind additional com- mercially sold insulation to prevent condensation.

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5/9/2008 2:23:43 PM