Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 51

[ II Restrictions ]
6. An example of a system in which a system controller is connected to the indoor-outdoor transmission
line (except LM adapter)
In the case of R2
CN41 CN40
L1
Replace
SW2-1 OFF ON
OC
51
TB3
TB7
M1M2 S M1M2
Connect
In the case of R2
Leave the male
connector
L21
on CN41 as it is.
SW2-1 OFF ON
OC
53
TB7 TB3
M1M2 S M1M2
NO
*1 BC and BS are found only in the R2 system.
Don'ts
1. M-NET remote controller and MA remote controller cannot
both be connected to the same group of indoor units.
2. No more than 2 MA remote controllers can be connected to
a group of indoor units.
3. Do not connect the terminal blocks (TB5) on the indoor units
that are connected to different outdoor units with each other.
4. Replacement of male power supply switch connector
(CN41) must be performed only on one of the outdoor units.
5. Provide grounding to S terminal on the terminal block for
transmission line for centralized control (TB7) on only one of
the outdoor units.
6. A maximum of 3 system controllers can be connected to the
indoor-outdoor transmission line, with the exception that
only one G-50 may be connected.
7. When the total number of indoor units exceeds 26, it may not
be possible to connect a system controller on the indoor-out-
door transmission line.
8. In a system to which more than 18 indoor units including one
or more indoor units of 72 model or above are connected,
there may be cases in which the system controller cannot be
connected to the indoor-outdoor transmission line.
Sample control wiring
In the case of Y
L2 CN41 CN40 Replace
SW2-1 OFF ON
OC
*1 BC
51
52
TB02 TB7
M1M2 S M1M2 S
Connect
M1M2 S
TB02
55
*1 BS
In the case of Y
L22
Leave the male connector
on CN41 as it is.
SW2-1 OFF ON
OC
*1 BC
53
54
TB02 TB7
M1M2 S M1M2 S
NO
System controller
M1M2 S
L2
L3
Group
Group
IC
01
TB3
TB5 TB15 TB5
M1M2
M1M2 S 1 2 M1M2 S
A1 B2
MA
L22
L23
Group
IC IC
03 04
TB3 TB5 TB5 TB15
TB15
M1M2 M1M2 S 1 2 M1M2 S 1 2
Note1
A1 B2
MA
Note1 LM adapters cannot be connected to the
indoor-outdoor transmission line.
Maximum allowable length
(1) Indoor/outdoor transmission line
Maximum distance (1.25mm
(L1)* +L2+L3+L4 200m [656ft]
(L21)* +L22+L23+L24 200m [656ft]
L25 200m [656ft]
*L1 and L21 are applicable only in the R2 system.
(2) Transmission line for centralized control
Maximum line distance via outdoor unit
2
(1.25mm [AWG16] or larger)
L25+L31+(L1)* +L2+L3+L4 500m [1640ft]
(L1)* +L2+L3+L4+L31
+(21)* +L22+L23+L24 500m [1640ft]
*L1 and L21 are applicable only in the R2 system.
(3) MA remote controller wiring
Same as [4] 1.
- 42 -
Interlock operation with
the ventilation unit
L4
LC
IC
05 07
TB15 TB5
1 2 M1M2 S
A1 B2
MA
NO
L24
LC
06
TB5
M1M2 S
2
[AWG16] or larger)