Mitsubishi Electric PUHZ-P100VHA2 Service Manual page 33

M-NET wiring
(1) Use 2-core × 1.25 mm² shield wire for electric wires.
(Excluding the case connecting to system controller.)
(2) Connect the wire to the M-NET terminal block. Connect one core of the trans-
mission wire (no-polarity) to A terminal and the other to B. 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
(A, B, S) on M-NET terminal block should be individually wired to the other
outdoor unit's terminal, i.e. A to A, B to B 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.
9-4-1. 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 1s digit and SW12 for 10s digit), which
is located on the M-NET board of outdoor unit.
(Factory setting: all addresses are set to "0".)
9-4-2. Refrigerant address setting
In the 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 setting 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
9-4-3. Regulations in address settings
In the case of multiple grouping system, M-NET and refrigerant address settings should be done as explained in the above
section. 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".
OCH415F
<Setting example>
ON ON ON
OFF OFF OFF
1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6
0 1 2
ON ON ON
OFF OFF OFF
1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6
8 9 10
■
The black square ( ) indicates a switch position.
Group A
Refrigerant Refrigerant
address 00 address 00
M-NET M-NET
address 01 address 02
A-control A-control
remote remote
controller controller
Group A
Refrigerant Refrigerant
address 00 address 01
M-NET M-NET
address 01 address 02
A-control
remote
controller
33
M-NET Address No.
SW11
1s
Switch
digit
setting
SW12
10s
digit
ON ON ON
OFF OFF OFF
1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6
3 4 5
ON ON ON
OFF OFF OFF
1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6
11 12 13
Group B
Refrigerant
address 01
M-NET
address 03
TB5
Refrigerant
address 00
M-NET
address 04
TB5
A-control
remote
controller
M-NET
terminal
Earth
block
wire
A B S
Transmission Shield
wire part
1 2 50
~
ON ON
OFF OFF
1 2 3 4 5 6 1 2 3 4 5 6
6 7
ON ON
OFF OFF
1 2 3 4 5 6 1 2 3 4 5 6
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