Mitsubishi Electric SUZ-SWM40 Installationshandbuch Seite 8

5. Refrigerant piping work
a
90°
b
a
en
a
b
c
B
a
c
6
a
b
b c
c
d e f
d
e
f
Fig. 5-3
a
c
b
c
d
d
Fig. 5-4
a
a
b
b
Fig. 5-5
A
a
e
b
c
b
d
d
e
c
Fig. 5-6
b
d e f g h
i
Fig. 5-7
Fig. 5-8
5.2. Flaring work
Copper tubes
Good
• Main cause of gas leakage is defect in flaring work.
No good
Carry out correct flaring work in the following procedure.
Tilted
Uneven
5.2.1. Pipe cutting (Fig. 5-3)
Burred
• Using a pipe cutter cut the copper tube correctly.
5.2.2. Burrs removal (Fig. 5-4)
• Completely remove all burrs from the cut cross section of pipe/tube.
• Put the end of the copper tube/pipe to downward direction as you remove burrs in
order to avoid burrs drop in the tubing.
Burr
Copper tube/pipe
5.2.3. Putting nut on (Fig. 5-5)
Spare reamer
• Remove flare nuts attached to indoor and outdoor unit, then put them on pipe/tube
Pipe cutter
having completed burr removal.
(not possible to put them on after flaring work)
5.2.4. Flaring work (Fig. 5-6)
• Carry out flaring work using flaring tool as shown at the right.
Flare nut
Copper tube
Pipe diameter
(mm)
6.35
Flaring tool
9.52
Die
12.7
Copper tube
15.88
Flare nut
Yoke
Firmly hold copper tube in a die in the dimension shown in the table at above.
5.2.5. Check (Fig. 5-7)
• Compare the flared work with a figure in right side hand.
• If flare is noted to be defective, cut off the flared section and do flaring work again.
Smooth all around
a
Inside is shining without any scratches
b
Even length all around
c
Too much
d
Tilted
e
• Apply a thin coat of refrigeration oil on the seat surface of pipe. (Fig. 5-8)
• For connection first align the center, then tighten the first 3 to 4 turns of flare nut.
• Use tightening torque table below as a guideline for indoor unit side union joint
section, and tighten using two wrenches. Excessive tightening damages the flare
section.
Copper pipe O.D.
(mm)
ø6.35
ø9.52
ø12.7
ø15.88
Warning:
When installing the unit, securely connect the refrigerant pipes before starting
the compressor.
Warning:
Be careful of flying flare nut! (Internally pressurized)
Remove the flare nut as follows:
1. Loosen the nut until you hear a hissing noise.
2. Do not remove the nut until the gas has been completely released (i.e., hiss-
ing noise stops).
3. Check that the gas has been completely released, and then remove the nut.
Dimension
A (mm)
When the tool for R32 is used
Clutch type
0 - 0.5
0 - 0.5
0 - 0.5
0 - 0.5
Scratch on flared plane
f
Cracked
g
Uneven
h
Bad examples
i
Flare nut O.D.
(mm)
17
22
26
29
+0
(mm)
B
-0.4
9.1
13.2
16.6
19.7
Tightening torque
(N·m)
14 - 18
34 - 42
49 - 61
68 - 82