Mitsubishi Electric MXZ-SM72TAM-U1 Service Manual page 170

6. Electrical work
Example of a group operation with 2 or more outdoor units and MA remote controllers. (Address settings are necessary.)
I Examples of wiring transmission cables
OC
(51)
TB3 TB7
M1 M2 S M1 M2 S
D
L
2
OC
(53)
TB3
TB7
M1 M2 S M1 M2 S
L
5
Power Supply
Unit
M1 M2 S
System
controller
M1 M2 S
I Wiring Method 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 and
M2 on the terminal S on the transmission cable terminal block of the CITY MULTI series indoor unit (M-IC).
3. Connect terminals 1 and 2 on the terminal block for MA remote controller line (TB15) on the indoor unit (M-IC) to the terminal block on the MA remote controller (MA-
RC). (Nonpolarized two-wire)
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. 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
Single refrigerant
en
Connection with indoor/outdoor
Multiple refrigerants
Connection with central control
25
L
1
A
M-IC
(01)
TB5
TB15
M1 M2 S
1 2
A B
MA-RC
L
3
M-IC
(03)
TB5 TB15
M1 M2 S
1 2
Range
01 to 50 Use the smallest address within the same group of indoor units.
01 to 50 Use an address, other than the M-IC (Main) in the same group of
M-NET indoor units. This must be in sequence with the M-IC (Main).
51 to 100 Use the smallest address of all the 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
2
M-IC M-IC
(02) (05)
TB5 TB5
TB15 TB15
M1 M2 S M1 M2 S
1 2 1 2
A B A B
MA-RC MA-RC
E
L
4
M-IC
M-IC
(04)
(07)
TB5 TB15 TB5 TB15
M1 M2 S M1 M2 S
1 2
1 2
A B
MA-RC
B
Setting Method
Transmission line Group operation in different
power supply unit refrigerant systems
–
–
Not required
Required
m
2
( ) : Address
M-IC
(06)
TB5
TB15
M1 M2 S
1 2
Group
A :
Group
B :
C : Group
D : Shielded Wire
Sub MA Remote Controller
E :
Power supply switching
–
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