Mitsubishi Electric CITY MULTI PEFY-P22VMS-E-S Data Book page 266

3. System remote controller
Power supply unit
PAC-SC51KUA
AT-50A
ON/OFF remote controller
* This figure omits the power supply line and only shows the transmission line.
<Restrictions>
Maximum of 50 units (50 channels) per AT-50A
However, the number of units that can be connected to a AT-50A is up to 50 including the number of contacts used on
this device, an indoor unit, LOSSNAY unit, etc.
Up to 6 contacts can be connected to the DIDO controller (1 M-NET address). One contact connected to this device is calculated as
the equivalent of one indoor unit connected to AT-50A.
For example, 5 contacts connected to the DIDO controller are calculated as the equivalent of 5 indoor units connected to
AT-50A.
• For the shield ground of the M-NET centralized control line, use single-point grounding at the power unit for
the transmission line.
However, when supplying electric power to the M-NET centralized control line from the R410A series outdoor
unit
outdoor unit. *1 : Except PUMY model.
Furthermore, when connecting this device to the M-NET indoor control line, use grounding at the TB3 for each
NOTE
outdoor unit system.
• If the M-NET transmission line of this device is connected to the M-NET indoor control line and the outdoor
unit is down because, for example, the power supply is interrupted for servicing or there is a failure, the DIDO
controller cannot be controlled from the system controller.
• Controlling the ON/OFF remote controller is only possible with channel 1 of a standard terminal block.
Centralized control line
M-NET M-NET
DIDO control
(a) (b)
(c) (d)
Ventilation fan,
lighting, etc.
*1
without using a power supply unit for the transmission line, use single-point grounding at the TB7 of that
CONTROLLER
Indoor control line
DIDO controller
CITY MULTI
(a) (b)
Ventilation fan,
lighting, etc.
24 VDC
Power supply
× up to 6 units
24 VDC
Power supply
(c) (d)
× up to 6 units
(a) ON/OFF, (ON) output
(b) (OFF) output
(c) ON/OFF input
(d) Error/Normal input
Standard: Terminal block (for 2 units)
Expansion: Connectors (for 4 units)
Total: 6 units
C7-R Rev.
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