En-7
6.2. Wiring method
Example
*2
*2
*2
Outdoor unit or RB unit *1
Transmission
Transmission
Indoor unit
Remote controller
(master)
Power supply
Indoor unit
Indoor unit
Power supply
Remote
control
Breaker
Breaker
Breaker
Remote controller
(slave)
Remote controller
*1: When connecting to the Heat Recovery System, refer to the installation manual of the
RB unit.
*2: Earth (Ground) the remote controller if it has an earth (ground) cable.
(Crossover wiring of power supply)
Indoor unit
Pull box
Pull box
Power supply
Power supply
Power supply
Indoor unit
Indoor unit
Breaker
Power supply
6.3. Unit wiring
Before attaching the cable to terminal block.
6.3.1. Cable specifications
Adjust the length of power supply cable to avoid excessive tension with referring figure
below.
20 mm
30 mm
Earth (Ground)
cable
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 screwdriver that is too small, otherwise, the screw heads may be dam
-
aged and prevent the screws from being properly tightened.
(4) Do not tighten the terminal screws too much, otherwise, the screws may break.
(5) Refer to the table for the terminal screw tightening torques.
(6) Please do not fix 2 power supply cables with 1 screw.
Strip 25 mm
Screw with
special washer
Screw with
special washer
Cable end (loop)
Loop
Terminal block
Cable end (loop)
Cable
Cable
Do not apply branch wiring. It may result electric shock or fire.
WARNING
When using solid core cables, do not use the 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) Refer to the table for the terminal screw tightening torques.
(7) Please do not fix 2 power supply cables with 1 screw.
Strip 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.
Tightening torque
M4 screw (Power supply/L, N, GND)
1.2 to 1.8 N·m (12 to 18 kgf·cm)
6.3.2. Transmission and Remote controller cable
Transmission cable
Remote controller cable
Shield cable
(no film)
25 mm
40 mm
20 mm
• Connect remote controller and transmission cables as shown in following figure.
GOOD
PROHIBITED
Different diameter
Connect to 1 side
WARNING
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
M3 screw (Transmission/X1, X2)
(Remote controller/ Y1, Y2)
0.5 to 0.6 N·m
(5 to 6 kgf·cm)
CAUTION
To peel the film 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 cable by overtightening the
screw. On the other hand, an undertightened screw can cause faulty contact, which will
lead to a communication failure.
6.4. Connection of wiring
(1) Remove the control box cover.
Control box cover
Screw
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