Mitsubishi Electric PUHY-P72THMU-A Service Handbook page 40

[ II Restrictions ]
3. Group operation of units in a system with multiple outdoor units
(1) Sample control wiring
Leave the male Leave the male
connector on connector on
CN41 as it is. CN41 as it is.
SW2-1 OFF SW2-1 OFF
OS2
53
TB3
M1 M2 M1 M2
TB7
M1 M2 M1 M2
S
Not
connect
L21
Leave the male Leave the male
connector on connector on
CN41 as it is. CN41 as it is.
SW2-1 OFF SW2-1 OFF
OS2
56
TB3
M1 M2 M1 M2
TB7
M1 M2 S M1 M2
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.
6) A transmission booster is required in a system to which
more than 32 indoor units (26 units if one or more indoor
units of the 72 model or above is connected) are con-
nected.
HWE08040
L11
CN41 CN40 Replace
Group
SW2-1 OFF
OS1 OC
52 51
TB5
TB3 TB3
M1M2
M1 M2
TB7 TB7
M1 M2
S S
Not
connect
Connect
Leave the male
connector on
CN41 as it is.
SW2-1 OFF
OS1 OC
55 54
TB5
TB3 TB3
M1M2
M1 M2
TB7 TB7
S M1 M2 S
Not
Not
connect
connect
L12
Group
IC IC
01 03
TB15 TB5 TB15
S 1 2 M1 M2 S 1 2
A B A B
MA MA
L22
Group
IC IC
02 04
TB5 TB15
TB15
S 1 2 M1M2 S 1 2
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.
- 31 - 31
Interlock operation with
the ventilation unit
Group
LC
IC
06 07
TB5 TB15 TB5
M1 M2 S 1 2 M1 M2 S
A B
MA
IC
05
TB5 TB15
M1M2 S 1 2
2
[AWG16] or larger)
GB