Mitsubishi Electric AT-50A Installation Manual page 4

*1 The power consumption coefficient of AT-50A is 4 and that of an indoor unit is "1"*, which means that each AT-50A unit consumes power equivalent to
four indoor units. (*Indoor units receive power through the M-NET transmission line to maintain communication during power failure.) Refer to the
CITY MULTI DATABOOK for details. The total power consumption of the connected devices should not exceed the capacity of the power supply units.
The Design Tool by MITSUBISHI ELECTRIC allows its user to design air conditioning systems easily.
AT-50A is compatible with the Design Tool version 3.9 or later.
AT-50A can be connected to either TB7 or TB3.
When connected to TB3, no power supply units are required.
• Address settings (Address overlaps are not allowed.)
Indoor unit
Outdoor unit
Auxiliary outdoor unit
(BC controller)
LOSSNAY unit
®
Mr. Slim unit
MXZ unit
M-NET remote controller
Sub system controller
DIDO
(PAC-YG66DCA)
MA remote controller
Note
• The system cannot be configured as shown in the examples below.
►Groups that are not controlled by a main controller cannot be
controlled from a sub controller.
Main system controller
Group
►Sub controllers cannot be controlled by two or more main controllers.
Main system controller 1
Group
2. M-NET wiring design
(1) M-NET transmission cable specifications and restrictions
Facility type
Type
Cable
Specifications
No. of cores
Size
Maximum indoor-outdoor transmission cable length
Maximum length of transmission line for centralized control and
indoor-outdoor transmission cables
(Maximum cable distance via outdoor unit)
Assign the lowest address to the main indoor unit in the group, and assign sequential addresses to
the rest of the indoor units in the same group.
Note: The following models require two addresses: PEFY-AF1200CFM and PEFY-AF1200CFM-R
Assign an address that equals the lowest indoor unit address in the same refrigerant system plus
50.
Assign an address that equals the address of the outdoor unit in the same refrigerant system
plus 1.
Assign an arbitrary but unused address to each LOSSNAY unit after assigning an address to all
indoor units.
Same rules as for the indoor units apply. An M-NET adapter (sold separately) is required.
Same rules as for the indoor units apply. An M-NET interface (sold separately) is required.
Assign an address that equals the address of the main indoor unit with the lowest address in the
group plus 100. Add 150 instead of 100 to set a sub-remote controller.
Assign an address that equals the lowest number of the group to be controlled plus 200.
Assign an arbitrary but unused address to the controller after completing the address setting for
the units with an address between 1 and 50. The number of controllable units depends on the
number of channels used. (1 channel = 1 unit)
Address setting is not required. The connection of two remote controllers requires the main/sub
setting for each controller to be made.
Sub system controller
Group Group
Sub system controller
Group Group
Address setting
►Each group cannot be controlled by two or more main
controllers.
Main system controller 2
Group
CVVS, MVVS: 1.25 mm² (AWG16) or larger
CPEVS: ø1.2 mm (AWG16 or its equivalent) or larger
*The maximum cable distance from the power supply unit to each outdoor
unit or to the system controller is 200 m [656 ft].
– 4 –
Main system controller 1 Main system controller 2
Group Group
All facility types
Shielded cable
CVVS · CPEVS · MVVS
2-core
200 m [656 ft]
500 m [1640 ft]
Address range
1~50
51~100
52~100
1~50
1~50
1~50
101~200
201~250
1~50
–
Group