Flare Connection; Pipe Connection - Mitsubishi Electric MSZ-GA24NA Installation Manual

3-1. CONNECTING WIRES FOR OUTDOOR UNIT
1) Remove the service panel.
2) Remove the conduit cover.
3) Attach the conduit connector to conduit cover with lock nut then secure it against unit
with screws.
4) Connect ground wires of indoor/outdoor unit connecting wire (A) and power supply cord
(K) to the TB support.
5) Loosen the terminal screw, and attach indoor/outdoor unit connecting wire (A) from the
indoor unit correctly on the terminal block. Attach the wire to the terminal block securely
so that its core cannot be seen, and no external force affects the connecting section of
the terminal block.
6) Firmly tighten the terminal screws. After tightening, verify that the wires are tightly fas-
tened.
7) Connect power supply cord (K).
8) Install the conduit cover.
9) Install the service panel securely.
5/8 in.
1-3/8 in.
I _(15mm)
(35 ram)
wead
_ Power supply
cord (K)
Service panel
Lock nut
Conduit cover
/ Connector
Power supply cord (K)
Indoor/outdoor unit
(A)
to conduit cover
Grounding
terminal
TB support
i ake ground wire a little longer than oth-
ers. (More than 1-3/8 in. [35 mm])
For future servicing, leave some slack in
the connecting wires.
A inch (mm) Tightening torque
Nut
Pipe diameter inch Clutch Clutch Wing nut ftolb
inch (mm) (mm) type tool type tool type tool Nom (kgf°cm)
for R410A for R22 for R22
1/4 13.7 to
1/4 (6.35) (17) 0.06 to 17.7
0.08
(1.5 to
3t8 2.0) 34.3 to
3/8 (9.52) (22) 0.04 to 41.2
0 to 0.02 0.06
(O to 0.5) (1 .O to
1/2 1.5) 49.0 to
o 1/2 (12.7) (26) 0.08 to 56.4
0.10
(2.0 to
5/8 2.5) 73.5 to
o 5/8 (15.88) (29) 78.4
10 to 13
(140 to
180)
25 to 30
(350 to
420)
36 to 42
(500 to
575)
54 to 58
(750 to
800)
3-2. 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 mm from the table according to the tool you use.
5) Check
• Compare the flared work with Fig. 6.
• If flare is defective, cut offthe section and repeat procedure.
3-3. PIPE CONNECTION
• Fasten flare nut with a torque wrench as specified in the table above.
• When fastened too tight, flare nut may eventually break and cause refrigerant leakage.
Indoor unit connection
Connect both liquid and gas piping 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.
3-4. 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.
_ opper
pipe
Fig. 1
Good No good
Tilted Uneven Burred
Fig. 2
Copper pipe
pare reamer
Pipe cutter
Fig. 3
Ftaring tool
tutch type Wing nut type
Fig. 4
Smooth all around Inside is shin-
ing without any
/_ scratches.
Even ,ength _ -[_ _
all around
I Fig. 6
A
Die / _'_-- Copper prpe
Flare nut
"Nc;_. 5