En-7
5.2. Wiring
method
Example
*2
*2
*2
Outdoor unit or RB unit *1
Breaker 1: Ground Fault Equipment
Breaker (GFEB)
Breaker 2: Maximum Circuit Breaker
(MAX. CKT. BKR)
Transmission
Transmission
Indoor unit
Remote controller
(Master)
Power supply
Indoor unit
Indoor unit
Power supply
Remote
control
Breaker 2
Breaker 2
Breaker 2
Breaker 1
Breaker 1
Breaker 1
Remote controller
(Slave)
Remote
controller
*1: When connecting to the Heat Recovery System, refer to the installation manual of the
RB unit.
*2: The 3-wire type remote controller is not used.
(Crossover wiring of power supply)
Indoor unit
Pull box
Pull box
Power supply
Power supply
Power supply
Indoor unit
Indoor unit
Breaker 2
Breaker 1
Power supply
: Disconnect switch
5.3. Unit
wiring
• Before attaching the cable to terminal block.
5.3.1 Power supply cable
A
B
Conduit connector
Conduit holder
Earth
(ground) cable
A [in (mm)]
B [in (mm)]
4/7/9 model
7-7/8 (200)
8-1/4 (210)
30/36 model
9-7/16 (240)
10-1/4 (260)
A. For solid core wiring
(1) To connect the electrical terminal, follow the below diagram and connect after looping
it around the end of the cable.
(2) Use the specified cables, connect them securely, and fasten them so that there is no
stress placed on the terminals.
(3) Use an appropriate screwdriver to tighten the terminal screws. Do not use a screw-
driver that is too small, otherwise, the screw heads may be damaged and prevent the
screws from being properly tightened.
(4) Do not tighten the terminal screws too much, otherwise, the screws may break.
(5) See the table for the terminal screw tightening torques.
(6) Please do not fix 2 power supply cables with 1 screw.
Strip 1 in
(25 mm)
Screw with
special washer
Screw with
special washer
Cable end (Loop)
Loop
Terminal block
Cable end (Loop)
Cable
Cable
WARNING
When using solid core cables, do not use the attached ring terminal. If you use the solid
core cables with the ring terminal, the ring terminal's pressure bonding may malfunction
and cause the cables to abnormally heat up.
B. For strand wiring
(1) Use ring terminals with insulating sleeves as shown in the figure below to connect to
the terminal block.
(2) Securely clamp the ring terminals to the cables using an appropriate tool so that the
cables do not come loose.
(3) Use the specified cables, connect them securely, and fasten them so that there is no
stress placed on the terminals.
(4) Use an appropriate screwdriver to tighten the terminal screws. Do not use a screw-
driver that is too small, otherwise, the screw heads may be damaged and prevent the
screws from being properly tightened.
(5) Do not tighten the terminal screws too much, otherwise, the screws may break.
(6) See the table for the terminal screw tightening torques.
(7) Please do not fix 2 power supply cables with 1 screw.
Strip 3/8 in
(10 mm)
Ring terminal
Sleeve
Screw with
special washer
Screw with
special washer
Ring terminal
Terminal block
Ring terminal
Cable
Cable
WARNING
Use ring terminals and tighten the terminal screws to the specified torques, otherwise,
abnormal overheating may be produced and possibly cause heavy damage inside the
unit.
Terminal number
Tightening torque
M4 screw (Power supply/L1, L2(N), GND)
11 to 16 lbf·in (1.2 to 1.8 N·m)
5.3.2 Transmission and Remote controller cable
Transmission cable
Remote controller cable
Shield
cable
(no film)
13/16 in (20 mm)
1-3/8 in
(35 mm)
13/16 in (20 mm)
• Connect remote controller and transmission cables as shown in figure below.
GOOD
Different diameter
Connect to 1 side
PROHIBITED
WARNING
Tighten the terminal screws to the specified torques, otherwise, abnormal overheating
may be occurred and possibly cause serious damage inside the unit.
Terminal number
Tightening torque
M3 screw (Transmission /X1, X2)
(Remote controller /Y1, Y2)
4.4 to 5.3 Ibf·in (0.5 to 0.6 N·m)
CAUTION
To peel the sheath from the lead cable, use a dedicated tool that will not damage the
conductor cable.
When installing a screw on the terminal block, do not cut the wire by overtightening the
screw. On the other hand, an under tightened screw can cause faulty contact, which will
lead to a communication failure.
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9373370420-02_IM.indb 7
2017/12/20 9:49:00
2017/12/20 9:49:00
