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BAC-12xxxx/13xxxx/14xxxx Series FlexStat

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The award-winning FlexStat is a controller and sensor in a single, attractive package that creates a flexible solution to stand-alone control challenges or BACnet network challenges. Temperature sensing is standard with optional humidity, motion, and CO2 sensing. Flexible input and output configurations and built-in or custom programming ensure that a variety of application needs can be met. Such applications include single- and multi-stage packaged, unitary, and split systems (including high SEER/EER variable speed packaged equipment), as well as factory-packaged and field-applied economizers, water-source and air-to-air heat pumps, fan coil units, central station air handling units, and other similar applications. In addition, an on-board library of programs permits a single model to be rapidly configured for a wide range of HVAC control applications. Thus, a single “one size fits all” FlexStat model can replace multiple competitor models.

A single BAC-120163CW, for example, can be quickly configured for any of these application options:

  • Air handling unit, with proportional heating and cooling valves, and with optional economizer, dehumidification, and/or fan status

  • Fan coil unit, 2-pipe or 4-pipe, proportional or 2-position valves, with optional dehumidification (w/ 4-pipe option) and/or fan status

  • Heat pump unit, with up to two compressor stages, and with optional auxiliary heat, emergency heat, dehumidification, and/or fan status

  • Roof top unit, with up to two H/C stages, and with optional economizer, dehumidification, and/ or fan status

FlexStats also provide the capability to customize the standard library of sequences using a KMC programming tool (BACstage or TotalControl). This enables a local authorized KMC installing contractor to adapt the standard library to the unique site needs and application- specific requirements of a particular project. BACnet over MS/TP communication is standard. “E” versions, with an RJ-45 jack, add BACnet over Ethernet, BACnet over IP, and BACnet over IP as Foreign Device (for communication across the Internet).



Interface and Function

  • User-friendly English-language menus (no obscure numeric codes) on a 64 x 128 pixel, dot-matrix LCD display with 5 buttons for data selection and entry

  • Multiple display options include selectable space temperature display precision, degrees F/C toggle, rotation values, display blanking, hospitality mode, and locked mode

  • Built-in, factory-tested libraries of configurable application control sequences

  • Integral energy management control with optimum start, deadband heating and cooling setpoints, and other advanced features to assure comfort while maximizing energy savings

  • Schedules can easily be set uniquely by the entire week (Mon.–Sun.), weekdays (Mon.–Fri.), weekend (Sat.–Sun.), individual days, and/or holidays; six On/Off and independent heating and cooling setpoint periods are available per day

  • Three levels of password-protected access (user/ operator/administrator) prevent disruption of operation and configuration—plus Hospitality mode and Locked User Interface mode offer additional tamper resistance

  • Integral temperature and optional humidity, motion (shown in photo above), and/or CO2 sensors

  • All models have 72-hour power (capacitor) backup and a real time clock for network time synchronization or full stand alone operation

  • Models functionally replace most Viconics and other competitors’ products


  • Six analog inputs for additional configurable remote external sensors, such as remote space temperature (with averaging, highest, and lowest options), remote CO2, OAT, MAT, DAT, water supply temperature, fan status, and other sensors

  • Inputs accept industry-standard 10K ohm (Type II or III) thermistor sensors, dry contacts, or 0–12 VDC active sensors

  • Input overvoltage protection (24 VAC, continuous)

  • 12-bit analog-to-digital conversion on inputs


  • Nine outputs, analog and binary (relays)

  • Each short-circuit protected analog output capable of driving up to 20 mA (at 0–12 VDC)

  • The NO, SPST (Form “A”) relays carry 1 A max. per relay or 1.5 A per bank of 3 relays (relays 1–3 and 4–6) @ 24 VAC/VDC 

  • 8-bit PWM digital-to-analog conversion on outputs



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