Mitsubishi Electric PUHY-HP144TSHMU-A Service Handbook page 41

[ II Restrictions ]
4. A system in which a system controller is connected to the transmission line for centralized control and which is pow-
ered from an outdoor unit
(1) Sample control wiring
Leave the male
connector on
CN41 as it is.
SW2-1 OFF ON
OS
52
TB3
M1 M2
TB7
M1 M2 S
Leave the male
connector on
CN41 as it is.
SW2-1 OFF ON
OS
55
TB3
M1 M2
TB7
M1 M2 S
(2) Cautions
1) M-NET remote controller and MA remote controller can-
not 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 jumper connector (CN41)
must be performed only on one of the outdoor units.
5) Short-circuit the shield terminal (S terminal) and the
earth terminal ( ) on the terminal block for transmission
line for centralized control (TB7) on the outdoor unit
whose power jumper connector is mated with CN40.
6) When a power supply unit is connected to the transmis-
sion line for centralized control, leave the power jumper
connector on CN41 as it is (factory setting).
HWE0716A
L11
CN41 CN40 Replace
SW2-1 OFF ON
Group
OC
IC
51
01
TB3
TB5 TB15
M1 M2 M1 M2 S 1 2
TB7
M1 M2 S
Not
connect
Connect
A B
MA
L21
Leave the male
connector on
CN41 as it is.
SW2-1 OFF ON
Group
OC
IC
54
04
TB3
TB5
TB15
M1 M2
M1 M2 S 1 2
TB7
M1 M2 S
Not
connect
Not A B
connect
MA
Note1
System controller
A B S
Interlock operation with
the ventilation unit
L12
Group Group
IC IC
02 03
TB5 TB15 TB5
M1 M2 S 1 2 M1 M2 S
A B
MA
L22
Group
IC
IC
05 06
TB5 TB15
TB5 TB15
M1 M2 S 1 2 M1 M2
S 1 2
A B
m3
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.
(3) Maximum allowable length
1) Indoor/outdoor transmission line
Same as [5] 3.
2) Transmission line for centralized control
Maximum line distance via outdoor unit
2
(1.25mm [AWG16] or larger)
L32+L31+L12(L11)
L32+L22(L21) 500m [1640ft]
L12(L11)+L31+L22(L21)
3) MA remote controller wiring
Same as [5] 1.
- 32 -
LC
07
TB15 TB5
1 2 M1 M2 S
A B
MA
LC
08
TB5
M1 M2 S
MA
500m [1640ft]
500m[1640ft]
GB