Outdoor Unit Installation; Flaring Work And Pipe Connection - Mitsubishi Electric MXZ-3A54VA Installationsanleitung

2. OUTDOOR UNIT INSTALLATION

2-1. CONNECTING WIRES FOR OUTDOOR UNIT
1) Remove the service panel.
2) Loosen terminal screw, and connect indoor/outdoor unit connecting
wire (B) from the indoor unit correctly on the terminal block. Be careful
not to make mis-wiring. Fix the wire to the terminal 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.
3) Firmly tighten the terminal screws to prevent them from loosening. Af-
ter tightening, pull the wires lightly to confirm that they do not move.
4) Perform 2) and 3) for each indoor unit.
5) Connect power supply cord (A).
6) Fix indoor/outdoor unit connecting wire (B) and power supply cord (A)
with the cable clamps.
7) Close the service panel securely. Make sure that 3-2. PIPE CONNEC-
TION is completed.
• After making connections between both power supply cord (A) and
indoor/outdoor unit connecting wire (B), be sure to fix both cable and
wire with cable clamps.
Indoor/outdoor unit connecting wire
Terminal
block
UNIT
UNIT
*D unit is for 4A71VA only
• Make earth wire a little longer than others. (More than 35 mm)
• For future servicing, give extra length to the connecting wires.

3. FLARING WORK AND PIPE CONNECTION

3-1. 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 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.
A (mm)
Pipe diameter Nut
Clutch Clutch
[mm (in.)] (mm)
type tool type tool
for R410A
for R22
ø6.35 (1/4") 17
ø9.52 (3/8")
22
0 to 0.5 1.0 to 1.5
ø12.7 (1/2")
26
ø15.88 (5/8") 29
Terminal Terminal
block block
UNIT UNIT
UNIT UNIT
<INDOOR UNIT>
Tightening torque
Wing nut
type tool
N•m kgf•cm
for R22
13.7 to 17.7 140 to 180
1.5 to 2.0
34.3 to 41.2 350 to 420
2.0 to 2.5 49.0 to 56.4 500 to 575
73.5 to 78.4 750 to 800
-
Service panel
<OUTDOOR UNIT>
Terminal Terminal block for
power supply
block
UNIT
POWER SUPPLY
~/N 230 V 50 Hz
UNIT
Copper
pipe
Fig. 1
Copper pipe
Burr
Spare reamer
Pipe cutter
Fig. 3
Copper pipe
Die
Flare nut
Fig. 5
Terminal block
for power supply
4A71VA
D unit is for 4A71VA only
15 mm
35 mm
Lead wire
No good
Good
Tilted Uneven Burred
Fig. 2
Flaring tool
Wing nut type
Clutch type
Fig. 4
Inside is shin-
ing without any
Smooth all
scratches.
around
Even length
all around
Fig. 6
5