– 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.)
Note
2. M-NET wiring design
(1) M-NET transmission cable specifications and restrictions
Address setting
Address range
Indoor 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
1~50
Outdoor unit
Assign an address that equals the lowest indoor unit address in the same refrigerant system plus
50.
51~100
Auxiliary outdoor unit
(BC controller)
Assign an address that equals the address of the outdoor unit in the same refrigerant system
plus 1.
52~100
LOSSNAY unit
Assign an arbitrary but unused address to each LOSSNAY unit after assigning an address to all
indoor units.
1~50
Mr. Slim
®
unit
Same rules as for the indoor units apply. An M-NET adapter (sold separately) is required.
1~50
MXZ unit
Same rules as for the indoor units apply. An M-NET interface (sold separately) is required.
1~50
M-NET remote controller
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.
101~200
Sub system controller
Assign an address that equals the lowest number of the group to be controlled plus 200.
201~250
DIDO
(PAC-YG66DCA)
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)
1~50
MA remote controller
Address setting is not required. The connection of two remote controllers requires the main/sub
setting for each controller to be made.
–
Cable
Specifications
Facility type
All facility types
Type
Shielded cable
CVVS · CPEVS · MVVS
No. of cores
2-core
Size
CVVS, MVVS: 1.25 mm² (AWG16) or larger
CPEVS: ø1.2 mm (AWG16 or its equivalent) or larger
Maximum indoor-outdoor transmission cable length
200 m [656 ft]
Maximum length of transmission line for centralized control and
indoor-outdoor transmission cables
(Maximum cable distance via outdoor unit)
500 m [1640 ft]
*The maximum cable distance from the power supply unit to each outdoor
unit or to the system controller is 200 m [656 ft].
• 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.
►
Sub controllers cannot be controlled by two or more main controllers.
►
Each group cannot be controlled by two or more main
controllers.
Group
Group
Group
Group
Group
Group
Group
Group
Group
Group
Main system controller 2
Main system controller 1
Main system controller
Sub system controller
Sub system controller
Main system controller 1
Main system controller 2
