Mitsubishi Electric MXZ-3C54VA Скачать руководство пользователя страница 5

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En-4

35 mm

15 mm

Lead wire

• Be sure to attach each screw to its correspondent terminal

when securing the cord and/or the wire to the terminal block.

• Make earth wire a little longer than others. (More than 35 mm)
• For future servicing, give extra length to the connecting wires.

Indoor/outdoor unit
connecting wire

Terminal block

POWER SUPPLY
~/N 230 V 50 Hz

Terminal block

Terminal block for
power supply

Terminal block

D unit is for 4C71VA only

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. After tighten-

ing, 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 CONNECTION is

completed.
• After making connections between both power supply cord (A) and indoor/out-

door unit connecting wire (B), be sure to ﬁx both cable and wire with cable
clamps.

4C71VA

Terminal block for power supply

Service panel

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

3. FLARING WORK AND PIPE CONNECTION

3-1. FLARING WORK

Pipe diameter

(mm)

Nut

(mm)

A (mm)

Tightening torque

Clutch

type tool

for R410A

Clutch

type tool

for R22

Wing nut

type tool

for R22

N•m

kgf•cm

ø6.35 (1/4”)

0 to 0.5

1.0 to 1.5

1.5 to 2.0

13.7 to 17.7 140 to 180

ø9.52 (3/8”)

34.3 to 41.2 350 to 420

ø12.7 (1/2”)

2.0 to 2.5

49.0 to 56.4 500 to 575

ø15.88 (5/8”)

73.5 to 78.4 750 to 800

Tilted Uneven Burred

Good

No good

Burr

Copper pipe

Spare reamer

Pipe cutter

Smooth all
around

Even length
all around

Inside is shin-
ing without any
scratches.

Flare nut

Die

Copper pipe

Clutch type

Flaring tool

Wing nut type

3-2. PIPE CONNECTION

1) Apply a thin coat of refrigeration oil (G) to the ﬂared ends of the pipes and

the pipe connections of the outdoor unit.

2) Align the center of the pipe with that of the pipe connections of the outdoor

unit, then hand tighten the ﬂare nut 3 to 4 turns.

3) Tighten the ﬂare nut with a torque wrench as speciﬁed in the table.

• Over-tightening may cause damage to the ﬂare nut, resulting in refrigerant

leakage.

• Be sure to wrap insulation around the piping. Direct contact with the bare

piping may result in burns or frostbite.

3-3. INSULATION AND TAPING

1) Cover piping joints with pipe cover.
2) For outdoor unit side, surely insulate every piping including valves.
3) Using piping tape (E), apply taping starting from the entry of outdoor unit.

• Stop the end of piping tape (E) with tape (with adhesive agent attached).
• When piping have to be arranged through above ceiling, closet or where

the temperature and humidity are high, wind additional commercially sold
insulation to prevent condensation.

Copper
pipe

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)

• Aim the copper pipe downward while removing burrs to prevent burrs from

dropping in the pipe.

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 selected.

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