21
English
•
Outside the units, the transmission wiring must be finished simulta
-
neously with the local refrigerant piping, and wound with tape (field
supply) as shown in the figure below.
1
2
3
4
5
1
Liquid pipe
2
Gas pipe
3
Transmission wiring
4
Insulation material
5
Finishing tape
•
For multi system:
1
Transmission wiring between outdoor units in the same piping
system must be connected to terminals Q1 and Q2 (TO MULTI
UNIT).
Connecting the wires to the F1, F2 (TO OUT/D UNIT) terminals
results in system malfunction.
2
Wiring to other systems should be connected to terminals F1 and
F2 (TO OUT/D UNIT) on the printed circuit board of the master
unit. The outdoor unit that connects transmission wiring to indoor
unit is the master unit. The others are sub unit.
9.5. Power wiring connection procedure
•
Be sure to connect the power supply wiring to the power supply ter
-
minal block and hold it in place using the included clamp as shown
in the figure below.
•
The L1, L2 and L3 phases of the power wiring should be secured
separately to the hook using the included clamp (1).
•
The ground wiring should be bound to the power wiring using the
included clamp (1) to prevent outside force from being applied to the
terminal area.
RXYQ72-168X type
1
4
2
3
7
6
9
8
5
1
Power supply (3-575V 60 Hz)
2
Branch switch, Overcurrent breaker
3
Ground wire
4
Control box
5
Attach insulation sleeves
6
Power supply terminal block
7
Ground terminal
8
Clamp (1) (accessory)
9
Vinyl tube (accessory)
CAUTION
•
Be sure to use crimp-style terminal with insulating sleeves for con
-
nections. (See the figure below.)
Crimp-style terminal
Insulating sleeve
Power wire
•
For wiring, use the designated power wire and connect firmly, then
secure to prevent outside pressure being exerted on the terminal
board.
•
Use an appropriate screwdriver for tightening the terminal screws.
A screwdriver with a small head will strip the head and make proper
tightening impossible.
•
Over-tightening the terminal screws may break them.
See the following table for the tightening torque of the terminal screws.
Screw size
Tightening torque
M8 Power terminal
4.20-5.09 ft
•
lbf (5.7-6.9 N
•
m)
M8 Ground terminal
7.15-8.63 ft
•
lbf (9.7-8.63 N
•
m)
•
When pulling the ground wire out, wire it so that it comes through the
cut out section of the cup washer. (See the figure below.) An improper
ground connection may prevent a good ground from being achieved.
Crimp-style terminal
Cut out section
Cup washer
•
When 2 wires are connected to a single terminal, connect them so
that the rear sides of the crimp contacts face each other. Also, make
sure the thinner wire is on top, securing the 2 wires simultaneously
to the resin hook using the included clamp (1).
Crimp-style
terminal
Wire : narrow
Terminal
block
Wire : thick
Resin hook
9.6. Procedure for Wiring Inside Units
•
Referring to the figure below, secure and wire the power and trans
-
mission wiring using the included clamp (1), (2) and (3).
•
Wire so that the ground wiring does not come into contact with the
compressor lead wiring.
If they touch, this may have an adverse effect on other devices.
•
The transmission wiring must be at least 2 in. (51 mm) away from
the power wiring.
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