Mitsubishi Electric City Multi CMH-WM250V-A, Service Handbook

Page: 56 / 436

[2-7 Example System with an MA Remote Controller ]
BS_02_E
chapter 2 -
19
2
Rest
rict
io
ns
2-7-5 System with a Connection of System Controller to Indoor-Outdoor
Transmission Line
(1) Sample control wiring
(2) Cautions
1) ME 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 jumper connector (CN41) must
be performed only on one of the outdoor units (not required
if power to the transmission line for centralized control is
supplied from a controller with a power supply function, such
as GB-50ADA).
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 three system controllers can be connected to
the indoor-outdoor transmission line. (AE-200, AG-150A,
GB-50ADA, or G(B)-50A are not connectable.)
7) When the total number of indoor units exceeds 26, it may
not be possible to connect a system controller on the indoor-
outdoor transmission line.
In a system to which more than 18 indoor units including one
or more indoor units of 200 model or above are connected,
there may be cases in which the system controller cannot be
connected to the indoor-outdoor transmission line.

Refer to the DATABOOK for further information about how
many booster units are required for a given system.
(3) Maximum allowable length
1) Indoor/outdoor transmission line
Maximum distance (1.25mm
2
[AWG16] or larger)
L11+L12 200m [656ft]
L21+L22 200m [656ft]
L25 200m [656ft]
2) Transmission line for centralized control
L31+L21 200m [656ft]
3) MA remote controller wiring
Same as 2-7-1
4) Maximum line distance via outdoor unit
(1.25mm
2
[AWG16] or larger)
L25+L31+L12(L11) 1000 m [3280ft] (500 m [1640ft])
*1
L12(L11)+L31+L22(L21) 1000 m [3280ft] (500 m
[1640ft])
*1
*1 If a given system includes one or more unit or remote con-
troller that does not support the maximum allowable cable
distance of 1,000 m [3280 ft], the maximum allowable ca-
ble distance in the system will be 500 m [1640 ft]. Refer
to the latest catalog for information on which units and re-
mote controllers support the maximum allowable cable
distance of 1,000 m [3280 ft].
IC
TB5
S
TB15
1 2
01
IC
TB5
S
TB15
1 2
02
A B
MA
A B
MA
LC
TB5
S
07
IC
TB5
S 1 2
TB15
IC
TB5
S
TB15
1 2
05 04
LC
TB5
S
08
IC
TB5
S
TB15
1 2
03
A B
MA
IC
TB5
S
TB15
1 2
06
A B
MA
A B
MA
M1 M2 M1 M2 M1 M2 M1 M2
M1 M2 M1 M2 M1 M2 M1 M2
OC
TB3
TB7
S
51
m2
m1
HU
TB3
52
M1 M2 S M1 M2
M1 M2
OC
TB3
TB7
S
54
HU
TB3
55
M1 M2 S M1 M2
M1 M2
L31
A B S
L25
Note1 LM adapters cannot be connected to the
indoor-outdoor transmission line.
Note1
System controller
SW5-1 OFF ON
Move the male connector
from CN41 to CN40.
SW5-1 OFF ON
Leave the male
connector on
CN41 as it is.
Group Group Group
Group Group
Interlock operation with
the ventilation unit
To be left
unconnected
To be connected
L12 L11
L22 L21
m3
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