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6. Electrical work
Example of a system using branch box and A-Control indoor unit
I Examples of wiring transmission cables
OC
(51)
TB3
TB7
M1 M2 S M1 M2 S
L
3
A
OC
(53)
TB7
L
TB3
4
M1 M2 S
M1 M2
S
Power Supply
A
Unit
M1 M2 S
System
controller
M1 M2 S
A: Shielded wire
I Wiring Method Address Settings
1. Always use shielded wire when making connections between the outdoor unit (OC) and the Branch Box, as well for all OC-OC and BC-BC wiring.
2. Use feed wiring to connect terminals M1 and M2 and the ground terminal on the transmission cable terminal block (TB3) of each outdoor unit (OC) to terminals M1 and
M2 on the terminal S on the transmission cable terminal block (TB5) of the Branch Box.
3. Connect terminals 1 and 2 on the transmission cable terminal block (TB5/TB15) of the A-control indoor unit (A-IC), to the terminal block on the MA remote controller
(MA-RC).
4. Connect together terminals M1, M2 and terminal S on the terminal block for centralized control (TB7) for the outdoor unit (OC).
5. The earth processing of S terminal for the centralized control terminal block (TB7) is unnecessary. Connect the terminal S on the power supply unit to the earth.
6. Set the address setting switch as follows.
Unit
A-IC
Branch Box
OC
MA-RC
7. When the system controller is connected to the system, set SW2-1 on all outdoor units to ON.
Also, set the power supply switching connectors (CN40, CN41) as follows.
Refrigerant system
Connection with system controller
en
Single refrigerant
Connection with indoor/outdoor
Multiple refrigerants
Connection with central control
27
Branch Box
L
1
TB5
M1
M2
S
L
2
A
Branch Box
TB5
M1
M2
S
Range
01 to 50
According to the set address of connected Branch Box, set the A-IC addresses
sequentially by SW1, SW11, SW12 on Branch Box.
(For example, when the Branch Box address is set to 01, set the A-IC addresses to 01,
02, 03, 04 and 05.)
01 to 50
Use a number within the range 1–50, but it should not make the highest address of
connected A-IC exceed 50.
51 to 100
Use the smallest address of all the Branch Box plus 50.
* The address automatically becomes "100" if it is set as "01–50".
-
Address setting is not necessary.
–
No
transmission line
system transmission line
L
m
6
1
TB3A
TB
TB5/TB15
S1
S1
1
A-IC
S2
S2
2
(01)
S3
S3
TB3B
TB
TB5/TB15
S1
S1
A-IC
1
S2
S2
2
(02)
S3
S3
TB3C
TB
TB5/TB15
S1
A-IC
1
S1
S2
2
S2
(03)
S3
S3
(01)
TB3D
TB
S1
S1
A-IC
S2
S2
(04)
S3
S3
TB3E
TB
S1
S1
A-IC
S2
S2
(05)
S3
S3
TB3A
TB
TB5/TB15
S1
S1
1
A-IC
S2
S2
2
(06)
S3
S3
TB3B
TB
(06)
S1
S1
A-IC
S2
S2
(07)
S3
S3
TB3C
TB
S1
S1
A-IC
S2
S2
(08)
S3
S3
Setting Method
Transmission line
Group operation in different
power supply unit
–
–
Not required
Required
( ) : Address
A
MA-RC
B
A
MA-RC
B
A
MA-RC
B
WL-RC
WL-RC
A
MA-RC
B
WL-RC
WL-RC
Power supply switching
refrigerant systems
–
Remains CN41 (default setting)
No
Yes
For one outdoor unit only, switch the
power supply switching connector
(CN41) to (CN40).
* Short-circuit the S (shield) terminal
Yes/No
and the ground terminal (
terminal block (TB7) of one outdoor
unit switched to CN40.
Yes/No
Remains CN41 (default setting)
connector settings
) of the
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