M-Net Address Setting; Refrigerant Address Setting; Regulations In Address Settings; M-Net Wiring - Mitsubishi Electric PUHZ-RP250YHA2 Service Manual

M-NET wiring

(1) Use 2-core x 1.25mm
2
(Excluding the case connecting to system controller.)
(2) Connect the wire to the M-NET terminal block. Connect one core of the
transmission wire (non-polar) to M1 terminal and the other to M2. Peel the
shield wire, twist the shield part to a string and connect it to S terminal.
(3) In the system which several outdoor units are being connected, the terminal
(M1, M2, S) on M-NET terminal block should be individually wired to the other
outdoor unit's terminal, i.e. M1 to M1, M2 to M2 and S to S. In this case, choose one of those outdoor units and drive a
screw to fix an ground wire on the plate as shown on the right figure.

8-4-1. M-NET address setting

In A-control models, M-NET address and refrigerant address should be set only for the outdoor unit. Similar to CITY MULTI
system, there is no need to set the address of outdoor unit and remote controller. To construct a central control system, the
setting of M-NET address should be conducted only upon the outdoor unit. The setting range should be 1 to 50 (the same as
that of the indoor unit in CITY MULTI system), and the address number should be consecutively set in a same group.
Address number can be set by using rotary switches
(SW11 for ones digit and SW12 for tens digit), which
is located on the M-NET board of outdoor unit.
(Initial setting: all addresses are set to "0".)

8-4-2. Refrigerant address setting

In case of multiple grouping system (multiple refrigerant circuits in one group), indoor units should be connected by remote
controller wiring (TB5) and the refrigerant address needs to be set. Leave the refrigerant addresses to "00" if the group set-
ting is not conducted. Set the refrigerant address by using DIP SW1-3 to -6 on the outdoor controller board. [Initial setting: all
switches are OFF. (All refrigerant addresses are "00".)]
Refrigerant
address

8-4-3. Regulations in address settings

In case of multiple grouping system, M-NET and refrigerant address settings should be done as explained in the above sec-
tion. Set the lowest number in the group for the outdoor unit whose refrigerant address is "00" as its M-NET address.
System
controller
Power
supply
unit for
transmission
wire
Refrigerant addresses can be overlapped if they are in the different group.
System
controller
Power
supply
unit for
transmission
wire
In group B, M-NET address of the outdoor unit whose refrigerant address is "00" is not set to the minimum in the group. As
"3" is right for this situation, the setting is wrong. Taking group A as a good sample, set the minimum M-NET address in the
group for the outdoor unit whose refrigerant address is "00".
shield wire for electric wires.
ON ON ON
OFF OFF OFF
1 2 3 4 5 6 1 2 3 4 5 6
0 1
ON ON
ON
OFF OFF OFF
1 2 3 4 5 6 1 2 3 4 5 6
8 9
Group A
Refrigerant
address 00
M-NET
address 01
A-control
remote
controller
Group A
Refrigerant
address 00
M-NET
address 01
A-control
remote
controller
<Setting example> M-NET Address No.
Switng
setting
ON ON ON
OFF OFF OFF
1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6
2 3 4
ON ON ON
OFF OFF OFF
1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6
10 11 12
Group B
Refrigerant Refrigerant
address 00 address 01
M-NET M-NET
address 02 address 03
TB5
A-control
remote
controller
Refrigerant Refrigerant
address 01 address 00
M-NET M-NET
address 02 address 04
TB5
A-control
remote
controller
18
M-NET
terminal
block
M1 M2 S
Transmission Shield
wire part
1 2
SW11
ones
digit
~
SW12
tens
digit
ON ON
OFF OFF
1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6
5 6 7
ON ON
OFF OFF
1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6
13 14 15
Group C
Refrigerant
address 00
M-NET
address 04
A-control
remote
controller
Group B
Refrigerant Refrigerant
address 01 address 02
M-NET M-NET
address 03 address 05
Ground
wire
50