Mitsubishi MFZ-KA09NA Installation Manual page 5

2-4. FLARE CONNECTION
1) Cut the copper pipe as straight as possible with a pipe cutter. (Fig. 1, 2)
2) Remove all burrs from the cut section of the pipe, ensuring that precautions are
taken to avoid getting metal shavings into the piping. (Fig. 3)
3) Remove flare nuts attached to indoor and outdoor units, then put them on pipe.
4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension shown in the
table. Select A inch (mm) from the table according to the tool you use.
5) Check
• Compare the flared work with Fig. 6.
• If flare is defective, cut off the section and repeat procedure.
A inch (mm)
Pipe
Nut
diameter
Clutch type Clutch type
inch
inch
tool tool
(mm)
(mm)
for R410A for R22
ø 1/4 1/4
(6.35) (17)
ø 3/8 3/8
(9.52) (22)
0 to 0.02 0.04 to 0.06
(0 to 0.5) (1.0 to 1.5)
ø 1/2 1/2
(12.7) (26)
ø 5/8 5/8
(15.88) (29)
2-5. PIPE CONNECTION
• Fasten flare nut with a torque wrench as specified in the table (refer to 2-4.).
• When fastened too tight, flare nut may eventually break and cause refrigerant leakage.
Indoor unit connection
Connect both liquid and gas pipings to indoor unit.
• Apply a thin coat of refrigerant oil (J) on the seat surface of pipe.
• To connect, 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 joints, and tighten using two wrenches. Excessive
tightening damages the flare section.
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit following the same procedure detailed in Indoor unit connection.
• For tightening, use a torque wrench or spanner.
WARNING
When installing the unit, securely connect the refrigerant
pipes before starting the compressor.
2-6. INSULATION AND TAPING
1) Cover piping joints with pipe cover.
2) For outdoor unit side, insulate the piping, including valves.
3) Apply piping tape (G) starting from the connection on the outdoor unit.
• When piping has to be installed through a ceiling, closet or where the temperature and humidity are high, use additional field-supplied insulation to prevent
condensation.
2-7. PIPE FORMING AND INSTALLATION
Connecting Pipe Installation
• Install the connecting pipes so that the piping can move slightly to the front, back, left, and right.
RIGHT DOWNWARD PIPING
Pipe cover (4)
Band (5)
Remove the
cover.
• Be sure to insulate the connecting pipes and place them near the rear of the indoor unit so that they do not contact the front panel.
• Be careful not to crush the connecting pipes when bending them.
Cut and use the lower side panels on the left and right sides of the indoor unit as shown below.
Smooth the cut edges of the side panels so that they will not damage the insulation coating.
• Installing flush against a
wall with molding
Molding
Tightening torque
Wing nut
ft•lb
type tool N•m
(kgf•cm)
for R22
10 to 13
13.7 to 17.7
(140 to 180)
0.06 to 0.08
(1.5 to 2.0)
25 to 30
34.3 to 41.2
(350 to 420)
36 to 42
49.0 to 56.4
(500 to 575)
0.08 to 0.10
(2.0 to 2.5)
54 to 58
73.5 to 78.4
(750 to 800)
OTHER PIPING
Band (5)
• For left or right piping
Cut the lower side panels to match the
height of the molding.
Copper
pipe
Copper pipe
Burr
Spare reamer
Pipe cutter
Copper pipe
Die
Flare nut
LEFT OR LEFT-REAR PIPING
• Bundle the connecting pipes and drain hose together, and then wrap them in
felt tape (11).
• Route the conduit pipe above and along the drain hose.
• There are conduit pipes that the left or left-rear piping connection cannot be
performed.
Wrap the felt tape
(11) tightly around
the pipes and hose
starting near where
the pipes and hose
are routed from the
indoor unit. (The
o v e r l a p w i d t h o f
the felt tape (11)
should not be more
than 1/2 of the tape
width.)
Felt tape (11)
No good
Good
Tilted Uneven Burred
Fig. 1
Flaring tool
Clutch type Wing nut type
Fig. 3
Inside is shin-
ing without any
Smooth all
scratches.
around
Even length
all around
Fig. 5
Start wrapping the piping
tape (G) around the pipes
and hose 3/8 in. (10 mm)
inside the indoor unit.
Fasten the end of the
felt tape (11) with a
bandage stopper.
Make sure that the drain hose
is not routed upward.
Fig. 2
Fig. 4
Fig. 6
En-