Si30-408 Adaptors for Connection of Air Conditioners
Appendix 221
5.4 DIII-NET Expander Adaptor <DTA109A51>
Even though the present D-BACS controls 64 groups and 128 indoor units at maximum of VRV
system by a single centralized controller, a combined use with the DIII-NET enables the control
of 64 groups and 1024 indoor units at maximum.
5.4.1 Part Names, Functions and Advantages
Extending the number of centralized controllable indoor units for VRV system to 64 groups
and 1024 units at maximum
Facilitating response to requirements for wiring in longer length due to large-scale systems
and extending flexibility in system design.
Enabling the protection of control lines by the DIII-NET expander adapter unit, which
achieves system design to diversify the risk of centralized control.
The DIII-NET expander adapter enables the connection of eight units at maximum in one
and the same control line.
A single unit of the DIII-NET expander adapter enables the connection of 10 outdoor unit
and 128 indoor units at maximum.
5.4.2 System Configuration
1. The number of units for centralized control can be extended up to 64 groups and 1024 units.
(Using two centralized controllers extends the number up to 128 groups and 1024 units.)
A limit for the number of connectable units with the DIII-NET comes to constitute that for the
expander adapter units.
In the ranges of B and C, a maximum of 128 indoor units and 10 outdoor units are connectable, respectively.
F1 F2
X1M
Power supply connector
To adapter power supply
connector of outdoor unit
Transmission wiring (F1, F2)
To terminal block of
outdoor unit to be
branched (Branch line)
Refer to information in
the section "Wiring".
Microcomputer normal monitor (HAP: Green)
If the microcomputer operates normally, this
LED will blink.
Transmission terminal block
Refer to information in the
section "Wiring".
DIII-NET expander adapter
A maximum of:
128 indoor units
10 outdoor units
A maximum of:
128 indoor units
10 outdoor units
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