Outdoor Unit Installation; Flaring Work - Mitsubishi Electric MSZA09NA Installation Manual

3. OUTDOOR UNIT INSTALLATION

3-1. CONNECTING WIRES FOR OUTDOOR UNIT
1) Remove the service panel.
2) Remove the conduit cover.
3) Fix the conduit connector to conduit plate (A models)/conduit cover (B models) with lock nut
then secure it against unit with screws.
4) Loosen terminal screw, and connect indoor/outdoor unit connecting wire (A) from the indoor
unit correctly on the terminal block. Be careful not to make mis-wiring. Fix the wire to the ter-
minal block securely so that no part of its core is appeared, and no external force is conveyed
to the connecting section of the terminal block.
5) Firmly tighten the terminal screws to prevent them from loosening. After tightening, pull the
wires lightly to confirm that they do not move.
6) Connect power supply cord (K).
7) Connect ground wires of indoor/outdoor unit connecting wire (A) and power supply cord (K)
to the TB support.
8) Install the conduit cover.
9) Install the service panel securely.
A
MU-A09WA
MUY-A15/17NA
MUZ-A09/12/15/17NA
B
MU-A12WA

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 remove 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 com-
pleted 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.
Nut
Pipe diameter
Clutch
inch
inch (mm)
type tool
(mm)
for R410A
1/4
ø 1/4 (6.35)
(17)
3/8
ø 3/8 (9.52)
(22)
0 to 0.02
(0 to 0.5)
1/2
ø 1/2 (12.7)
(26)
5/8
ø 5/8 (15.88)
(29)
A inch (mm) Tightening torque
Clutch Wing nut
type tool type tool N•m
for R22 for R22
0.06 to
13.7 to 17.7
0.08
(1.5 to
0.04 to
34.3 to 41.2
2.0)
0.06
(1.0 to
0.08 to
49.0 to 56.4
1.5)
0.10
(2.0 to
73.5 to 78.4
2.5)
1 in.
(25 mm)
Lead wire
Terminal block
Terminal block
ft•lb
(kgf•cm)
Clutch type
10 to 13
(140 to 180)
25 to 30
Smooth all
(350 to 420)
around
36 to 42
(500 to 575)
Even length
all around
54 to 58
(750 to 800)
MU-A09/12WA
19/32 in.
(15 mm)
MUY-A15/17NA
MUZ-A09/12/15/17NA
• Make earth wire a little longer than others.
(More than 1-12/32 in. 35 mm)
• For future servicing, give extra length to
the connecting wires.
Indoor/outdoor unit
connecting wire (A)
Power supply cord (K)
Conduit cover
• Make earth wire a little longer than others.
(More than 1-12/32 in. 35 mm)
• For future servicing, give extra length to
the connecting wires.
Power supply cord (K)
Indoor/outdoor unit
connecting wire (A)
Good
90°
Copper
pipe
Fig. 1
Copper pipe
Burr
Spare reamer
Pipe cutter
Flaring tool
Die
Wing nut type
Flare nut
Fig. 4
Inside is shin-
ing without any
scratches.
Fig. 6
L1 N
Power supply cord (K)
L1 L2
Power supply cord (K)
No good
Tilted Uneven Burred
Fig. 2
Fig. 3
A
Copper pipe
Fig. 5