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6. Electrical work
Example of a group operation system with 2 or more outdoor units and an M-NET remote controller.
(Address settings are necessary.)
I Examples of wiring transmission cables
OC
(51)
TB3
TB7
M1 M2 S
M1 M2 S
L
2
D
OC
(53)
TB7
L
TB3
5
M1 M2 S
M1 M2
S
Power Supply
Unit
M1 M2 S
System
controller
M1 M2 S
I Wiring Method and Address Settings
1. Always use shielded wire when making connections between the outdoor unit (OC) and the CITY MULTI series indoor unit (M-IC), as well for all OC-OC, and IC-IC wir-
ing.
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, M2
and terminal S on the transmission cable terminal block of the CITY MULTI series indoor unit (M-IC).
3. Connect terminals M1 and M2 on the transmission cable terminal block of the CITY MULTI series indoor unit (M-IC) that has the most recent address within the same
group to the terminal block on the M-NET remote controller (M-NET RC).
4. Connect together terminals M1, M2 and terminal S on the terminal block for centralized control (TB7) for the outdoor unit (OC).
5. Set the address setting switch as follows.
Unit
M-IC (Main)
M-IC (Sub)
OC
M-NET RC (Main)
M-NET RC (Sub)
MA-RC
6. The group setting operations among the multiple CITY MULTI series indoor units are done by the M-NET remote controller (M-NET RC) after the electrical power has
been turned on.
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.
en
Refrigerant system
Connection with system controller
Single refrigerant
Connection with indoor/outdoor
Multiple refrigerants
Connection with central control
21
L
1
A
M-IC
(01)
TB5
M1 M2 S
A B
(101)
M-NET RC
L
3
M-IC
(03)
TB5
M1 M2 S
Range
01 to 50
Use the smallest address within the same group of CITY MULTI series indoor units.
01 to 50
Use an address, other than the M-IC (Main) in the same group of CITY MULTI
series indoor units. This must be in sequence with the M-IC (Main).
51 to 100
Use the smallest address of all the CITY MULTI series indoor units plus 50.
* The address automatically becomes "100" if it is set as "01–50".
101 to 150
Set at an M-IC (Main) address within the same group plus 100.
151 to 200
Set at an M-IC (Main) address within the same group plus 150.
-
Address setting is not necessary. (Main/sub setting is necessary.)
–
No
transmission line
system transmission line
C
M-IC
M-IC
(02)
(05)
TB5
TB5
M1 M2 S
M1 M2 S
A B
A B
(105)
(155)
M-NET RC M-NET RC
E
L
4
M-IC
M-IC
(04)
(07)
TB5
TB5
M1 M2 S
M1 M2 S
A B
(104)
M-NET RC
B
Setting Method
Transmission line
Group operation in different
power supply unit
refrigerant systems
–
–
Not required
Required
( ) : Address
M-IC
(06)
TB5
M1 M2 S
A :
Group
B :
Group
C :
Group
D :
Shielded Wire
E :
Sub M-NET Remote Controller
Power supply switching
connector settings
–
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)
) of the
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