|How it works
Overview
The 75F® DAD Dual Duct is a custom terminal profile that is introduced to support the VAV dual-duct systems. It consists of a air handling unit that has two coils, a continuously operating cooling coil and a continuously operating heating coil.
Operation
The cooling coil feeds chilled air into a cold air duct and the heating coil feeds hot air into a hot air duct, the ducts run parallelly throughout the building. The air is tapped from the two ducts by a terminal unit at each space. The terminal unit can have a hot or cold air damper. When the zone requires heating, the hot air damper opens. When cooling is required, the cold air damper opens.
Advantages
- The system Dual duct variable air volume (DDVAV)) is used to obtain zone level temperature control by mixing the cold and warm air in various volume combinations.
- The fan used is of a size that anticipates the maximum hot or cold air volume, and not the sum of the instantaneous peaks.
- With control provided with customized DAB Dual Duct Terminal zone , we can install 75F products in Buildings which have VAV dual-duct systems.
|Wiring
|Configuration
You are provided with the following configurable options in the configuration screen.
- Temp Offset
- Analog-out1
- Analog-out2
- Thermistor-1
- Thermistor-2
- Max and Min damper Pos Cooling
- Max and Min damper Pos Cooling
- Enable Occupancy sensor
- Enable CO2 Control
- Enable IOQ control
Configuration Parameters
|
Parameter |
Purpose |
Default Value |
Values in the drop-down list |
|
Temperature Offset |
To set the offset temperature |
0 (°F) |
Range from -10 to + 10 in .1 increments
|
|
Analog-out1 |
To actuate the dampers Set to Composite Damper Actuator |
Composite Damper Actuator |
|
|
Analog-out2 |
To actuate the dampers Set to Not used |
Composite Damper Actuator |
|
|
Thermistor-1 |
To enable connection to Discharge airflow 10K sensor |
Discharge airflow 10K sensor |
|
|
Thermistor-2 |
To enable connection to Supply Air Temperature |
Cooling Supply Air Temperature |
|
|
Max damper Pos Cooling |
To define maximum position for the cooling damper |
0 |
0-100 |
|
Min damper Pos Cooling |
To define minimum position for the cooling damper |
0 |
0-100 |
|
Max damper Pos Heating
|
To define maximum position for the heating damper |
0 |
0-100 |
|
Min damper Pos Heating
|
To define minimum position for the heating damper |
0 |
0-100 |
|
Enable Occupancy sensor |
To enable control based on occupancy |
Disabled |
NA |
|
Enable CO2 Control |
To enable control based on CO2 level |
Disabled |
NA |
|
Enable IOQ control |
To enable control based on input and output air quality |
Disabled |
NA |
- Configure and enable the required parameters and click Set to confirm the configuration.
The Profile takes effect in CCU and portals as follows.
Comments
0 comments
Please sign in to leave a comment.