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When handling PC board, static electricity charged in the body may cause
malfunction of the PC board. Follow the cautions below:
• Establish an earth (ground) for the RB units , indoor units, outdoor units and
peripheral devices.
• Cut power (breaker) off.
• Touch metal part of the RB units, indoor units and outdoor units for more than
10 seconds to discharge static electricity charged in the body.
• Do not touch terminals of parts and patterns implemented on PC board.
7.2. Electrical requirement
Voltage rating
230 V
Operating range
198 to 264 V
• Select the power cable type and size in accordance with relevant local and national
regulations.
• Specifi cations for local wiring power cord and branch wiring are in compliance with
local code.
• Max. wire length: Set a length so that the voltage drop is less than 2%. Increase the
wire diameter when the wire length is long.
Breaker should be installed at every refrigerant system. Do not use a breaker in a
different refrigerant system.
Refer to the table for the breaker specifi cations of each installation condition. Perform
the power crossover wiring within the range of the same refrigerant system. When the
crossover wiring is done, make a connection for RB units to satisfy conditions A and B
below.
A. Current breaker requirements
Model
MCA
UTP-RX01AH
0.13 A
UTP-RX01BH
0.19 A
UTP-RX01CH
0.26 A
MCA: Minimum Circuit Ampacity
MFA: Maximum Fuse Ampacity
When the power crossover wiring is done, make it so that the total of the MCA of the
connected RB units and indoor units does not exceed the 15 A. For indoor unit MCA,
refer to the indoor unit installation manual.
If the capacity of connected RB units and indoor units exceeds the upper limit, either
add breakers or use a breaker with a greater capacity.
B. Earth leakage breaker requirements
Breaker capacity
30 mA, 0.1 sec or less
100 mA, 0.1 sec or less
* If the total number of units connected to the breaker exceeds 44, either add a 30mA
breaker, or use breakers with a greater capacity.
7.2.1. Cable specifi cations
Follow the specifi cations below for the power supply and transmission cable.
Recommended
cable size
2
(mm
)
Power supply
2.5
cable
Transmission
0.33
cable
7.3. Wiring
7.3.1. Power supply cable
Keep the ground cable longer than the other cables.
Earth (Ground)
cable
Power supply cable
(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.
En-7
CAUTION
MFA
20 A
Connectable RB units and indoor units
44 or less *
45 to 148
Cable type
Remark
Type60245
1ø 50 Hz 198 to 264 V
IEC57 or
2 Cable + earth (ground)
equivalent
22 AWG LEVEL 4
LONWORKS
(NEMA) non-polar 2
compatible
core, twisted pair solid
cable
core diameter 0.65 mm
(4) 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.
(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.
Screw with spe-
cial washer
Ring terminal
Cable
Terminal block
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)
7.3.2. Transmission cable
Shielded cable
(no fi lm)
GOOD
Different diameter
Tighten the terminal screws to the specified torques, otherwise, abnormal
overheating may be produced and possibly cause heavy damage inside the unit.
Tightening torque
M3 screw
(Transmission / X1, X2)
To peel the fi lm 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 under tightened screw can cause
faulty contact, which will lead to a communication failure.
Ring terminal
Sleeve
Screw with
special washer
Ring
terminal
Cable
WARNING
1.2 to 1.8 N·m
(12 to 18 kgf·cm)
PROHIBITED
Connect to 1 side
WARNING
0.5 to 0.6 N·m
(5 to 6 kgf·cm)
CAUTION
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