BACNET TOUCHSCREEN COMMUNICATING THERMOSTAT (BCT) TECHNICAL REQUIREMENTS

This article is about general and technical requirements for BACNET TOUCHSCREEN COMMUNICATING THERMOSTAT (BCT) used in Integrated Automation System or Building Automation System.

BACNET TOUCHSCREEN COMMUNICATING THERMOSTAT (BCT) TECHNICAL REQUIREMENTS

1. BACnet Conformance

   • BCT shall be approved by the BTL as meeting the BACnet Advanced Unitary Controller requirements.
   • BCT shall, at a minimum, support MS/TP BACnet LAN types. They shall communicate directly through this BACnet LAN at 9.6, 19.2, 38.4 and 76.8 Kbps, as a native BACnet device.
   • Standard BACnet object types supported shall include, as a minimum, Analog Input, Analog Output, Analog Value, Binary Input, Binary Output, Binary Value, Device, File, and Program Object Types.
   • All proprietary object types, if used in the system, shall be thoroughly documented and provided as part of the submittal data. All necessary tools shall be supplied for working with proprietary information.
2. BCT hardware shall:
   • Include a 32 Bit processor
   • Include a backlit touchscreen for the user interface, buttons are not allowed.
   • Include Three (3) universal inputs with 12-bit resolution that can accept 3K and 10K Type II thermistors, 0-10VDC, 0–5 VDC, 4-20mA, and dry contact signals. Inputs on controller may be either analog or digital.
   • Include built-in temperature sensor.
   • Include built-in humidity sensor.
   • Include Six (6) relay outputs on board.
   • Include Two (2) analog outputs with 12-bit resolution. Each auto-detecting for 0-10 V or 4-20 mA control signals.
   • Meet the requirements of Listed Underwriters Laboratory for Open Energy Management Equipment (PAZX) under the UL Standard for Safety 916.
   • Meet the requirements of EMC Directive (European CE Mark) EN 60950.
   • Meet the requirements for FCC Part 15, Class B.
   • Be powered by 24VAC power.
3. <Note to Specifier: The following section D is only needed for projects where the wireless sensor version is required and appropriate sensors are used. Delete for all other projects.>

4. <Wireless sensors shall be supported by the BCT

   • Support up to eight (8) magnetic contact switches with CR2032-battery powered wireless transmitter.
   • Support up to three (3) passive infrared (PIR) motion detectors with 140-degree detection angle and AAA battery-powered wireless transmitter.
   • Meet the requirements for FCC Part 15, Class B.
   • Individual wireless sensor inputs can be used by fully programmable DDC to create custom sequence of operations in controller.
   • Sensors operate in the 433.92 MHz wireless frequency with 50-foot range>