Flaring Work And Pipe Connection - Mitsubishi Electric MXZ-2C20NA3 Notice D'installation

3 . F L A R I N G
3 - 1 . F L A R I N G W O R K
1) Cut the copper pipe correctly w ith pipe cutter. (Fig. 1, 2)
2) Completely remove all burrs from the cut cross section of
pipe. (Fig. 3)
• Aim the copper pipe do n ard hile removing burrs to
prevent burrs from dropping in the pipe.
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 or .)
4) Flaring w ork (Fig. 4, 5). Firmly hold copper pipe in the
dimension show n in the table. Select A inch (mm) from
the table according to the tool selected.
5) Check
• Compare the flared or
• If flare is noted to be defective, cut off the flared section
and do flaring or again.
Pipe diameter B
[inch (mm)] [inch (mm)]
1/4 (ø6.35) 21/32 (17)
e n
3/8 (ø9.52) 7/8 (22)
1/2 (ø12.7) 1-1/32 (26)
5/8 (ø15.88) 1-5/32 (29)
3 - 2 . P I P E C O N N E C T I O N
• The connected pipe size differs depending the models and the capacities of indoor units.
Indoor unit capacity
Indoor unit: M series
Indoor unit: S series
Indoor unit: P series *1
*1 Refer to the installation manual of P series for details of MVZ-A and SVZ-KP.
• Use tightening torque table above as a guideline for indoor unit side union
joint section, and tighten using t o renches. Excessive tightening damages
the flare section.
1) Apply a thin coat of refrigeration oil (G) to the flared ends of the pipes and the
pipe connections of the outdoor unit. Do not apply refrigeration oil on screw
threads. Excessive tightening torque ill result in damage on the scre .
2) or connection, first align the center, then tighten the first 3 to 4 turns of flare
nut by hand.
3) Tighten the flare nut ith a torque rench as specified in the table.
• Over-tightening may cause damage to the flare nut, resulting in refrigerant
leakage.
• Be sure to w rap insulation around the piping. Direct contact w ith the bare
piping may result in burns or frostbite.
3 - 3 . I N S U L A T I O N A N D T A P I N G
1) Cover piping joints ith pipe cover.
2) or 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) ith tape ( ith adhesive agent attached).
• When piping have to be arranged through above ceiling, closet or
the temperature and humidity are high, w ind additional commercially sold
insulation to prevent condensation.
5
W O R K A N D P I P E C O N N E C T I O N
ith ig. 6.
Clutch type tool for R410A Clutch type tool for R22
0 to 0.02
(0 to 0.5)
06 ~ 09
Liquid pipe size ø6.35 ø6.35
Gas pipe size ø9.52 ø9.52
Liquid pipe size ø6.35 ø6.35
Gas pipe size ø9.52 ø9.52
Liquid pipe size ø6.35 ø6.35
Gas pipe size ø9.52 ø12.7
Copper
pipe
Fig. 1
Flaring tool
Die
Wing nut type
Clutch type
Fig. 4
A [inch (mm)]
Wing nut type tool for R22
0.06 to 0.08
(1.5 to 2.0)
0.04 to 0.06
(1.0 to 1.5)
0.08 to 1.0
(2.0 to 2.5)
12 15
ø6.35
ø12.7
ø6.35
ø12.7
ø6.35
ø12.7
W h e n i n s t a l l i n g
c o n n e c t t h e re fri g e ra n t p i p e s b e fo re
s t a rt i n g t h e c o m p re s s o r.
W h e n t h e r e a r e t h e p o r t s w h i c h a r e
here
n o t u s e d , m a k e s u re t h e i r n u t s a re
t i g h t e n e d s e c u re l y .
No good
Good
Burr
Tilted Uneven Burred
Fig. 2
Smooth all
around
Copper pipe
Flare nut
B
Fig. 5
Tightening torque
ft-Ib
10 to 13 13.7 to 17.7
25 to 30 34.3 to 41.2
36 to 42 49.0 to 56.4
54 to 58 73.5 to 78.4
WARNING
t h e u n i t , s e c u r e l y
CAUTION
Copper pipe
Spare reamer
Pipe cutter
Fig. 3
Inside is shin-
ing w ithout any
scratches.
Even length
all around
Fig. 6
N•m kgf•cm
140 to 180
350 to 420
500 to 575
750 to 800