VCES-DDC-IOM-1C
4
The DDC control package includes a four-button user in-
terface called the BacStat II. This device can be mounted
anywhere and when room air tempering is needed, can be
configured as a room thermostat. A wide range of config-
uration options are included and can be accessed through
the BacStat (see Figure 2).
For stand alone operation an external dry contact (ex: re-
mote time clock, CO
2
sensor or manual selector switch,
etc.) for scheduling mode must be provided by others or is
available as an accessory item. This is the only connection
required to start single-speed units.
The Delta DDC is a native BACnet device that can com-
municate over an RS-485 network running between 9,600
and 76,800 baud. Delta products are tested for interoper-
ability between multiple vendors at the BACnet Testing
Laboratory (BTL). The use of a BTL listed front end will
greatly simplify network installation and allow problemfree
communication.
When connected to the network, all scheduling can be
taken over by the front end control system (provided by
others). Additional access is provided to dozens of control
variables which give the Building Management System
as much control as needed (with the exception of critical
functions, such as the defrost strategy and other fail safes).
Occupied Ventilation (Ov)
Jumper across FW 304–305. This is the main mode that
will enable the unit to run in 100% fresh air mode. Free
cooling and defrost will initiate based on the setpoint.
Unoccupied (Un)
No jumpers on any of the terminals 304, 305, 306, 307 or
308. The unit will turn off.
Unoccupied Recirculation (Ur) (Optional)
Jumper across FW 305–306. The unit will turn off un-
less there is a call for heating/cooling or dehumidification
across the heating/cooling or dehumidification contacts.
This call must come from an optional thermostat or hu-
midistat. The unit will run in recirc mode upon a call.
Occupied Recirculation (Or) (Optional)
Jumper across FW 306–307. The unit will run and recirc
a percentage of air. The outside and exhaust air dampers
may be adjusted to open a certain percentage, thus reduc-
ing the amount of fresh air and increasing the amount or
recirc air.
Adjust the following parameters:
#143 – Outside Air Damper Minimum Setpoint
• Limits: 0–100%
• Factory set: 100%
• BACnet variable: AV150
• Function: The outside air damper minimum setpoint
is set in conjunction with the exhaust air damper
minimum setpoint to allow for the required recircula-
tion air.
#144 – Exhaust Air Damper Minimum Setpoint
• Limits: 0–100%
• Factory set: 100%
• BACnet variable: AV151
• Function: The exhaust air damper minimum setpoint
is set in conjunction with the outside air damper
minimum setpoint to allow for the required recircula-
tion air.
Building Management System Scheduling
Alternatively the software point MV12 can be used to
schedule the unit as described above. If this method is
Control Details
Stand Alone Operation
Network Operation
Ventilation Control Scheduling Modes
Figure 2: BacStat II
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