En-8
6.1.1. Transmission and remote controller wiring specifi cations
Follow the specifi cations below for the transmission and remote controller cable.
Cable size Wire type Remarks
Transmission cable
22 AWG
(0.33 mm²)
LEVEL 4 (NEMA) non-polar
2core, twisted pair solid core
diameter 0.026 in (0.65 mm)
LONWORKS ®
compatible cable
Remote controller
cable
(2-wire type)
22AWG to 16AWG
(0.33 to 1.25 mm²)
Non polar 2 core
Use sheathed
twisted pair cable
18AWG
Thermostat cable
2 core
Use sheathed non
twisted pair cable
Remote controller cable
(3-wire type)
22 AWG
(0.33 mm²)
Sheathed PVC cable
Polar 3 core
Twisted pair
6.2. Wiring method
Example
Outdoor unit or RB unit *1
Breaker 1: Ground Fault Equipment
Breaker (GFEB)
Breaker 2: Maximum Circuit Breaker
(MAX. CKT. BKR)
Transmission
Transmission
Power supply
Breaker2
Breaker2 Breaker2
Breaker1
Breaker1 Breaker1
Power supply
Remote controller
(Master)
Breaker shall be located in sight from and readily accessible from all indoor units.
*1: When connecting to the Heat Recovery System, refer to the installation manual of
the RB unit.
*2: When connecting the 2-wire type remote controller, Y3 is not used.
Remote controller
(Slave)
Remote controller
Indoor unit
Remote
control
*2
*2
*2
Indoor unit Indoor unit
(Crossover wiring of power supply)
Breaker2
Breaker1
Indoor unit
Power supply
Pull box
Pull box
Power supply
: Disconnect switch
Power supply Power supply
Indoor unit Indoor unit
Disconnect switch shall be installed between indoor unit and pull box.
6.3. Unit wiring
• Before attaching the cable to terminal block.
6.3.1. Power supply cable
Adjust the length of power supply cable to avoid excessive tension with referring fi gure
below.
Power supply cable
Earth (Ground)
wire
Conduit connector
4-3/4 in (120 mm)
5-1/8 in (130 mm)
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 specifi ed 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 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 fi x 2 power supply cables with 1 screw.
Strip 1 in
(25 mm)
Loop
Screw with
special washer
Screw with
special washer
Cable end
(Loop)
Cable
Cable
Terminal block
Cable end (Loop)
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 fi gure 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 specifi ed 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 fi x 2 power supply cables with 1 screw.
Sleeve
Strip 3/8 in
(10 mm)
Screw with
special washer
Screw with special
washer
Ring terminal
Cable
Terminal block
Cable
Ring terminal
Ring
terminal
WARNING
Use ring terminals and tighten the terminal screws to the specifi ed torques, otherwise,
abnormal overheating may be produced and possibly cause heavy damage inside the
unit.
Tightening torque
M4 screw
(Power supply/L1, L2 (N), GND)
11 to 16 lbf·in
(1.2 to 1.8 N·m)
9365748237_IM.indb Sec1:89365748237_IM.indb Sec1:8 6/16/2015 4:24:46 PM6/16/2015 4:24:46 PM
To Next Page
Loading...
