DAB Advanced Hybrid AHU - Wiring/ Configuration

6 Minute Read

| How it Works

The 75F DAB Advanced Hybrid AHU profile provides a hybrid profile of configurable relays and analog outputs to operate within our Dynamic Airflow Balancing application.  Once you select the DAB Advanced Hybrid AHU profile from the system selection, you can enable the applicable relays or analog outputs for your packaged unit.  You may also re-map the equipment stages for any enabled relays.  Do this by selecting any of the drop-downs under 'Mapping'.  Lastly, under 'Test Signal' you may enable that relay for testing purposes.  

Below the profile configuration is additional parameters for adjusting the analog output voltage to each piece of equipment.  You may program min/max output voltage for min/max system operation.  

Each zone is configured for parameters such as size of damper and min/max damper positions as input for tracking in the algorithms.  A zone is assigned different priority levels based on individual needs - low, medium, high, or no priority; this lets the user designate which zones are more important than others for the operation of the AHU.  With this in mind, the system will actively monitor the average zone temperature while weighing individual priority levels.  As the load in the spaces shifts, the system will determine if an additional cooling, heating or fan speed is needed. 

Cooling - When modulating cooling, as your cooling loop output (0-100%) rises above 0%, the 0-10v analog signal will modulate with it.  When staging cooling, the algorithm will divide your stages evenly among the cooling loop output scale.  

5-stages of cooling:

• Cooling loop output > 0%, Cooling Stage 1   Turns On
• Cooling loop output > 20%, Cooling Stage 2   Turns On
• Cooling loop output > 40%, Cooling Stage 3   Turns On
• Cooling loop output > 60%, Cooling Stage 4   Turns On
• Cooling loop output > 80%, Cooling Stage 5   Turns On

• Cooling loop output <= 70%, Cooling Stage 5  Turns Off
• Cooling loop output <= 50%, Cooling Stage 4  Turns Off
• Cooling loop output <= 30%, Cooling Stage 3  Turns Off
• Cooling loop output <= 10%, Cooling Stage 2  Turns Off
• Cooling loop output <= 0%, Cooling Stage 1  Turns Off

Heating - When modulating heating, as your heating loop output (0-100%) rises above 0%, the 0-10v analog signal will modulate with it.  When staging heating, the algorithm will divide your stages evenly among the heating loop output scale.  

• Heating loop output > 0%, Heating Stage 1   Turns On
• Heating loop output > 20%, Heating Stage 2   Turns On
• Heating loop output > 40%, Heating Stage 3   Turns On
• Heating loop output > 60%, Heating Stage 4   Turns On
• Heating loop output > 80%, Heating Stage 5   Turns On

• Heating loop output <= 70%, Heating Stage 5  Turns Off
• Heating loop output <= 50%, Heating Stage 4  Turns Off
• Heating loop output <= 30%, Heating Stage 3  Turns Off
• Heating loop output <= 10%, Heating Stage 2  Turns Off
• Heating loop output <= 0%, Heating Stage 1  Turns Off

Recirculate -  When recirculating with a VFD, the default output voltage will be 4v.   Or if the fan is staged, it will utilize stage-1 fan to recirculate.  

| Wiring

| Configuration

Relays 1-6 - By default are configured as a traditional thermostat connections. However, depending on your equipment, you can reconfigure (Mapping) any of these relays to act as heating, cooling, or fan. 

Relay 7 - Auxillary relay for humidifier or dehumidifier contact. This is a wet contact. If your equipment needs a dry contact, please see wiring information for which jumper to pull from the CM board. 

Test Signal - At any point you can override the value the output the algorithm decided. This is used for troubleshooting and testing your equipment. 

Analog-out1 - Cooling output scaled to the cooling load. 0Vdc = No cooling demand. 10Vdc = Max cooling demand. 

Analog-out2 - Fan Speed. Scaled based on the demand for pressure. 

Analog-out3 - Heating. Output scaled to the heating load. 0Vdc = No heating demand. 10Vdc = Max heating demand. 

Analog-out4 - Composite. This assumes no demand at the mid point. Very configurable. (E.g. 5Vdc = No demand. 0Vdc = Max Cooling demand. 10Vdc = Max Heating Demand) 

Analog-out1-3 at Min and Max - Set the minimum output at minimum load or maximum load. Typically synced with your equipment. 

Analog-out4 at Min and Max - Here you need to be careful because it is so customizable. Your Min can be more than the max values depending on unit configuration. What you need to know is that however you set this up, must be matched up with your unit. (A common example would be an RTU where you are setting up a DAT reset. AO4 @ Min Cooling = 5, AO4 @ Min Heating = 5, AO4 @ Max Cooling = 0, and AO4 @ Max Heating = 10V. Then you'd need to sync your DAT setpoints at the RTU to match. 0Vdc = 55F and 10Vdc = 100F)