Mitsubishi Electric PUHY-HP144TSHMU-A Service Handbook page 39

[ II Restrictions ]
3. Group operation of units in a system with multiple outdoor units
(1) Sample control wiring
Leave the male
connector on
CN41 as it is.
SW2-1 OFF
OS
52
TB3
M1 M2
TB7
M1 M2 S
Leave the male
connector on
CN41 as it is.
SW2-1 OFF
OS
55
TB3
M1 M2
TB7
M1 M2 S
Not
connect
(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) Provide grounding to S terminal on the terminal block for
transmission line for centralized control (TB7) on only
one of the outdoor units.
HWE0716A
L11
CN41 CN40 Replace
Group
SW2-1 OFF
OC
IC
01
51
TB5 TB15
TB3
M1M2 S 1 2
M1 M2
TB7
M1 M2 S
Not
connect
Connect
A B
MA
L21
Leave the male
connector on
CN41 as it is.
SW2-1 OFF
OC
IC
02
54
TB5
TB15
TB3
M1M2
S 1 2
M1 M2
TB7
M1 M2 S
Not
connect
Interlock operation with
the ventilation unit
L12
Group
Group
IC IC
03 06
TB5 TB15 TB5
M1 M2 S 1 2 M1 M2 S
A B
MA
L22
Group
IC
04
TB5 TB15
M1M2 S 1 2 M1M2
A B
MA
(3) Maximum allowable length
1) Indoor/outdoor transmission line
Maximum distance (1.25mm
L11+L12 200m [656ft]
L21+L22 200m [656ft]
2) Transmission line for centralized control
Maximum line distance via outdoor unit
2
(1.25mm [AWG16] or larger)
L12+L31+L22 500m [1640ft]
L11+L31+L21 500m [1640ft]
3) MA remote controller wiring
Same as [5] 1.
- 30 -
LC
07
TB15 TB5
1 2 M1 M2 S
A B
MA
IC
05
TB5 TB15
S 1 2
2
[AWG16] or larger)
GB