Flaring Work And Pipe Connection - Mitsubishi Electric MXZ-2B20NA Installation Manual

3. FLARING WORK AND PIPE CONNECTION

3-1. FLARING WORK
remove burrs in order to avoid to let burrs drop in the piping.
on pipe having completed burr removal. (Not possible to put them on
shown in the table. Select A mm from the table according to the tool
Pipe diameter Nut
3-2. PIPE CONNECTION
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.
When installing the unit, securely connect the refrigerant
pipes before starting the compressor.
3-3. INSULATION AND TAPING
unit.
• When piping have to be arranged through above ceiling, closet or
6
for R410A
17
22
0 to 0.5
26
29
WARNING
Copper pipe
Burr
Spare reamer
Pipe cutter
Die
Flare nut
for R22 for R22
1.5 to 2.0
1.0 to 1.5
2.0 to 2.5
-
-
No good
Good
Copper
pipe
Tilted Uneven Burred
Fig. 1
Flaring tool
Fig. 3
Inside is shin-
Smooth all
scratches.
around
Copper pipe
Even length
all around
Fig. 5
Tightening torque
N•m kgf•cm
13.7 to 17.7 140 to 180
34.3 to 41.2 350 to 420
49.0 to 56.4 500 to 575
73.5 to 78.4 750 to 800
Fig. 2
Fig. 4
Fig. 6
ft·Ib
10 to 13
25 to 30
36 to 42
54 to 58