Advanced Unitary Controller (AUC) Technical Requirements for IAS

This article is about general and technical requirements for Advanced Unitary Controller (AUC) used in Integrated Automation System or Building Automation System.

Advanced Unitary Controller (AUC) Technical Requirements for IAS

1. The Advanced Unitary Controller (AUC) platform shall be designed specifically to control HVAC – ventilation, filtration, heating, cooling, humidification, and distribution. Equipment includes: constant volume air handlers, VAV air handlers, packaged RTU, heat pumps, unit vents, VAV boxes, fan coils, natural convection units and radiant panels. The control shall use <LonMark or BACnet> based devices where the application has a LonMark profile or BTL Listed PICS defined. Where LonMark devices are not available for a particular application, devices based on LonWorks shall be acceptable. For each LonWorks device that does not have LonMark certification, the device supplier shall provide an XIF file for the device. The controller platform shall provide options and advanced system functions, programmable and configurable, using Niagara 4 Framework, that allow standard and customizable control solutions required in executing the “Sequence of Operation” in Section 25 90 00.
2. Minimum Requirements:
   1. The AUC shall be fully programmable in Honeywell WEBs or configurable with full functionality on any Niagara 4 brand platform.
      • Support downloads to the controller in Honeywell WEBs Niagara 4 platform.
      • Support uploads from the controller to Honeywell WEBs Niagara 4 platform.
      • Support simulation/debug mode of the controller.
      • Maintain native GUI.
      • Native function-block programming software and all controller “Setup Wizards” shall be embedded within the Niagara 4 environment.
   2. The AUC shall be capable of either integrating with other devices or stand-alone operation.
   3. For VAV box applications, the AUC shall have an internal velocity pressure sensor.
      • Sensor Type: Microbridge air flow sensor with dual integral restrictors.
      • Operating Range: 0 to 1.5 inch H2O (0 to 374 Pa).
      • Accuracy: +/- 2% of full scale at 32 degrees to 122 degrees F (0 degrees to 50 degrees C); +/- 1% of full scale at null pressure.
   4. The AUC shall have two microprocessors. The Host processor contains on-chip FLASH program memory, FLASH information memory, and RAM to run the main HVAC application. The second processor for network communications. AUC memory minimum requirements include:
      • FLASH Memory Capacity: 60 Kilobytes with 8 Kilobytes for application program.
      • FLASH Memory settings retained for ten years.
      • RAM: 2 Kilobytes
   5. The AUC shall have an internal time clock with the ability to automatically revert from a master time clock on failure.
      • Operating Range: 24 hour, 365 day, multi-year calendar including day of week and configuration for automatic day-light savings time adjustment to occur on configured start and stop dates.
      • Accuracy: +/- 1 minute per month at 77 degrees F (25 degrees C).
      • Power Failure Backup: 24 hours at 32 degrees to 122 degrees F (0 degrees to 50 degrees C)
   6. The AUC shall have Significant Event Notification, Periodic Update capability, and Failure Detect when network inputs fail to be detected within their configurable time frame.
   7. The AUC shall have an internal DC power supply to power external sensors.
      • Power Output: 20 VDC +/- 10% at 75 mA.
   8. The AUC shall have a visual indication (LED) of the status of the devise:
      • Controller operating normally.
      • Controller in process of download.
      • Controller in manual mode under control of software tool.
      • Controller lost its configuration.
      • No power to controller, low voltage, or controller damage.
      • Processor and/or controller are not operating.
   9. The minimum AUC Environmental ratings.
      • Operating Temperature Ambient Rating: -40 degrees to 150 degrees F (-40 degrees to 65.5 degrees C) for an AUC in unconditioned
      • Storage Temperature Ambient Rating: -40 degrees to 150 degrees F (-40 degrees to 65.5 degrees C) for an AUC in unconditioned
      • Operating Temperature Ambient Rating: 32 degrees to 122 degrees F (0 degrees to 50 degrees C) for an AUC in conditioned
      • Storage Temperature Ambient Rating: 32 degrees to 122 degrees F (0 degrees to 50 degrees C) for an AUC in conditioned
      • Relative Humidity: 5% to 95% non-condensing.
   10. The AUC shall have the additional approval requirements, listings, and approvals:
       • UL/cUL (E87741) listed under UL916 (Standard for Open Energy Management Equipment) with plenum rating.
       • CSA (LR95329-3) Listed.
       • Meets FCC Part 15, Subpart B, Class B (radiated emissions) requirements.
       • Meets Canadian standard C108.8 (radiated emissions).
       • Conforms requirements European Consortium standard EN 61000-6-1; 2001 (EU Immunity).
       • Conforms requirements European Consortium standard EN 61000-6-3; 2001 (EU Emission).
   11. The AUC housing shall be UL plenum rated mounting to either a panel or DIN rail (standard EN50022; 7.5mm x 35mm).
   12. For VAV box applications, the AUC shall provide an integrated actuator option.
       • Actuator type: Series Floating.
       • Rotation stroke: 95 degrees +/- 177;3 degrees for CW or CCW opening dampers.
       • Torque rating: 44 lb-inch (5 Nm).
       • Run time for 90 degree rotation: 90 seconds at 60 Hz.
   13. The AUC shall have a mix of Universal Inputs (UI), Digital Inputs (DI), Analog Outputs (AO), and Digital Triac Outputs (DO), as well as a 2-wire, polarity insensitive, AUC communication bus providing Sensor, Actuator, and I/O expandability.
       • Analog outputs (AO) shall be capable of being configured as digital outputs (DO).
       • Input and Output wiring terminal strips shall be removable from the AUC without disconnecting wiring.
       • Input and Output wiring terminals shall be designated with color coded labels.
       • Universal inputs shall be capable of being configured as binary inputs, resistive inputs, voltage inputs (0-10 VDC), or current inputs (4-20 mA).
   14. The AUC shall provide “continuous” automated loop tuning with an Adaptive Integral Algorithm Control Loop.
   15. The AUC platform shall have standard HVAC application programs that are modifiable to support both the traditional and specialized “sequence of operations” as outlined in Section 25 90 00.
       1. Discharge air control and low limit.
       2. Pressure-dependent dual duct without flow mixing.
       3. Variable air volume with return flow tracking.
       4. Economizer with differential enthalpy.
       5. Minimum airflow coordinated with CO2.
       6. Unit ventilator cycle (1, 2, 3) 2-pipe.
       7. Unit ventilator cycle (1, 2, 3) 2-pipe with face/bypass.
       8. Unit ventilator cycle (1, 2, 3) 4-pipe.
       9. Unit ventilator cycle (1, 2, 3) 4-pipe with EOC valve.
       10. VAV terminal unit.
       11. VAV terminal unit fan speed control.
       12. Series fan.
       13. Parallel fan.
       14. Regulated air volume (room pressurization/de-pressurization).
       15. CV dual-duct.
       16. Room CO2 control.
       17. Room Humidity.
       18. TOD occupancy sensor stand-by set points.