Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 43

[ II Restrictions ]
4. An example of a system in which a system controller is connected to the transmission line for central-
ized control
In the case of R2
CN41 CN40
L1
Replace
SW2-1 OFF ON
Note1
OC
51
TB3
TB7
M1M2 S M1M2
Connect
In the case of R2
Leave the male
connector on
L21
CN41 as it is.
SW2-1 OFF ON
Note1
OC
53
TB3
TB7
M1M2 S M1M2
NO
Note1 When only the LM adapter is connected,
leave SW2-1 to OFF (as it is).
Note2 LM adapters require the power supply
capacity of single-phase AC 208/230V.
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 transmission booster must be connected to a system to
which more than 26 indoor units including one or more in-
door units of 72 model or above are connected.
Sample control wiring
In the case of Y
CN41 CN40
L2
Replace
SW2-1 OFF ON
Note1 OC
*1 BC
51
52
TB02 TB7
M1M2 S M1M2 S
Connect
M1M2 S
TB02
55
*1 BS
In the case of Y
Leave the male connector
L22
on CN41 as it is.
SW2-1 OFF ON
Note1
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
A1 B2
MA
Note2
*1 BC and BS are found only in the R2 system.
Maximum allowable length
(1) Indoor/outdoor transmission line
Same as [4] 3.
(2) Transmission line for centralized control
Maximum line distance via outdoor unit
2
(1.25mm [AWG16] or larger)
L32+L31+(L1)* +L2+L3+L4 500m [1640ft]
L32+(L21)* +L22+L23+L24 500m [1640ft]
L1+L2+L3+L4+L31
+(L21)* +L22+L23+L24 500m [1640ft]
*L1 and L21 are applicable only in the R2 system.
(3) MA remote controller wiring
Same as [4] 1.
- 34 -
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