Mitsubishi Electric MLZ-KA25VA Notice D'installation page 8

3-2. 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 re-
move 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.
Pipe diameter Nut
Clutch
(mm) (mm)
type tool
for R410A
ø6.35 (1/4") 17
ø9.52 (3/8") 22
0 to 0.5
ø12.7 (1/2") 26
ø15.88 (5/8") 29
3-3. 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.
• Be sure to wrap insulation around the piping. Direct contact with the
bare piping may result in burns or frostbite.
Indoor unit connection
Connect both liquid and gas pipings to indoor unit.
• Apply a thin coat of refrigeration oil on the seat surface of pipe.
• For connection, first align the center, then tighten the first 3 to 4 turns
of flare nut.
• Use tightening torque table above as a guideline for indoor unit side
union joint section, and tighten using two wrenches. Excessive tight-
ening damages the flare section.
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.
3-4. INSTALLING THE PIPE COVER
Make sure to install the pipe cover. Incorrect installation results in water
leakage.
• No insulation is needed on the pipe connecting part of the indoor side
for this unit. The pipe cover gathers the water condensed around the
pipe connecting part.
1) Install the pipe band removed in 2-5. to secure the connecting pipes.
* The pipe band should hold down the insulating material of connect-
ing pipe. Insulating material should protrude 10 mm or more than the
pipe band, as shown in the illustration on the right.
2) Install pipe cover.
When using pipe with super insulating material
(about ø48 mm liquid pipe, ø51 mm gas pipe)
1) Make sure that the plate is turned over, and the concave part is fac-
ing upward. (Refer to 2-5)
2) Use band (6) provided with the unit. (Do not use the pipe band at-
tached to the unit)
3) Connecting pipe exit of pipe cover is precut. Cut it along the line.
4) Install pipe cover.
Note:
Install pipe cover and pipe band securely. Incomplete installation will
cause water to drip from the unit, soaking and damaging household
goods.
En-
All manuals and user guides at all-guides.com
A (mm) Tightening torque
Wing nut
Clutch type
type tool for N•m
tool for R22
R22
13.7 to 17.7 140 to 180
1.5 to 2.0
34.3 to 41.2 350 to 420
1.0 to 1.5
2.0 to 2.5 49.0 to 56.4 500 to 575
- 73.5 to 78.4 750 to 800
Copper
pipe
Fig. 1
Copper pipe
Burr
Spare reamer
Pipe cutter
Fig. 3
A
kgf•cm
Copper pipe
Die
Flare nut
Fig. 5
WARNING
When installing the unit, securely
connect the refrigerant pipes before
starting the compressor.
Insulating material
should protrude 10
mm or more than
the edge of pipe
band
Insulating material
should protrude 10
mm or more than
the edge of pipe
band
Fixing screw (7)
No good
Good
90°
Tilted Uneven Burred
Fig. 2
Flaring tool
Clutch type Wing nut type
Fig. 4
Inside is shin-
ing without any
Smooth all
scratches.
around
Even length
all around
Fig. 6
Pipe band
Insulating material
should protrude 10 mm
or more than the edge
of pipe band
Pipe cover
Band (6) (accessory part)
Insulating material
should protrude 10
mm or more than the
edge of pipe band
Fixing screw (7)
Cut
Pipe cover