En-4
4D72VA
35 mm
5 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.
<OUTDOOR UNIT>
Indoor/outdoor unit
connecting wire
<INDOOR UNIT>
Terminal block
POWER SUPPLY
~/N 230 V 50 Hz
Terminal block
Terminal block
Terminal block for
power supply
Terminal block
D unit is for 4D72VA only
2. OUTDOOR UNIT INSTALLATION
2-1. CONNECTING WIRES FOR OUTDOOR UNIT
) 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.
Terminal block for power supply
Service panel
Fig.
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 R40A
Clutch
type tool
for R22
Wing nut
type tool
for R22
N•m
kgf•cm
ø6.35 (/4”)
7
0 to 0.5 .0 to .5
.5 to 2.0
3.7 to 7.7 40 to 80
ø9.52 (3/8”)
22
34.3 to 4.2 350 to 420
ø2.7 (/2”)
26
2.0 to 2.5
49.0 to 56.4 500 to 575
ø5.88 (5/8”)
29
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. Do not apply refrigeration oil on
screw threads. Excessive tightening torque will result in damage on the
screw.
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
) 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
) Cut the copper pipe correctly with pipe cutter. (Fig. , 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
again.
WARNING
When installing the unit, securely
connect the refrigerant pipes before
starting the compressor.
CAUTION
When there are the ports which are
not used, make sure their nuts are
tightened securely.
JG79A627H01_en.indd 4
2012/09/07 11:32:15