BAS Controls and Refrigeration Equipment
Refer to the Chapel Hill Controls Standards.
The building automation system (BAS) is a BACnet or LON based open protocol system. Consult with UNC Engineering Services regarding which system to use. The UNC Controls Standards are prescriptive in nature. The designer is responsible for editing the controls standards to fit the project scope. The standardized schematic drawings must be edited with changes bubbled. The standardized specification shall be edited in Word format with track changes on for review. Provided the edited digital controls documents to UNC Engineering Services for review. Refer to UNC Controls Preface and Implementation Guidance document for specific instructions.
The BAS will be a stand-alone system, capable of operating the building by itself. The University requires the BAS to be connected to a central location called the Energy Management Control System (EMCS) located at the Giles F. Horney Building. The project will provide graphics, data trending, scheduling, etc. Refer to the UNC-Chapel Hill Controls Guidelines.
Connect the following to the Life Safety campus monitoring system: lab freezers, environmental rooms, and lift station high level alarms.
Additional Controls Requirements
- For demolition of existing HVAC, specify that all cut pneumatic tubes to be sealed w/ pneumatic plugs. Crimping and taping are prohibited.
- The designer shall provide a controls valve schedule.
Refrigerant Isolation Valves
Provide refrigerant ball valves at individual components for servicing without the need of pumping the entire system down. This applies to environmental cold rooms, VRF systems or any condensing unit that is not equipped with factory isolation valves.
Mini-Split AC and Heat Pumps
Approved brands: LG, Mitsubishi or Trane. Specify LG as basis of design. (UNC stocks LG parts)
Air-cooled condensing units must not be installed indoors. Provide water-cooled condensing units when process water is available.