Thermostats use BACnet to communicate

Dec. 10, 2021
Contemporary Controls offers BACnet-compliant wired or wireless thermostats for modulating fan coil operation.

Contemporary Controls recently announced the availability of BACnet-compliant wired or wireless thermostats that are suitable for modulating heating, cooling, and ventilation for 4-pipe HVAC systems.

“The new thermostats are intended for modulated control of fan coil units (FCUs), which are often used on job sites because they allow the HVAC system to react to load changes within a space quickly and efficiently,” said Joe Stasiek, Contemporary Tools sales manager. “By providing modulated control, the thermostats work with FCUs to provide a more consistent and comfortable environment within a building.”

The new models join the company’s BASstat Communicating Thermostat series. They are BACnet compliant to ensure seamless integration into a BACnet/IP (WiFi) or BACnet MS/TP (EIA-458) networks, the company pointed out. The BAST-421C-B2 wired thermostat is BACnet MS/TP connected using an EIA-485 serial connection. The BAST-421C-BW2 wireless thermostat is BACnet/IP connected using a wireless connection to a nearby WiFi access point that supports IEEE 802.11b/g/n.

Both models provide modulated heating and cooling control in a wall-mount enclosure with an LCD. Intended for use with 4-pipe heated/chilled water FCUs, the thermostats can control two analog modulating water valve actuators and one binary supply fan. The LCD display indicates setpoint, space temperature, and current mode of operation using graphical icons.

“The thermostat helps to improve the control and delivery of conditioned air to suit the temperature requirements of an immediate space, which is ideal for applications that require individual temperature control, such as hotel rooms, offices, and apartments,” Contemporary Controls said. “As a result, FCUs maintain a more constant air temperature control, minimizing the time, energy, and cost to ramp up the system to maintain and deliver the desired temperature.”

A configurable control algorithm allows adaptability to the specific application. This adaptive control algorithm applied to modulated valve control saves energy and ensures comfort for occupants, the company added. Three sensing options are available: built-in temperature sensor, input for remote temperature sensor, or temperature override network command from the building automation system. Occupancy status can be set from thermostat buttons, a wired input, or over the BACnet network. Thermostat buttons can be locked to prevent tampering.

Voice your opinion!

To join the conversation, and become an exclusive member of Buildings, create an account today!

Sponsored Recommendations

Building Better Schools

Download this digital resource to better understand the challenges and opportunities in designing and operating educational facilities for safety, sustainability, and performance...

Tips to Keep Facility Management on Track

How do you plan to fill the knowledge gap as seasoned facility managers retire or leave for new opportunities? Learn about the latest strategies including FM tech innovations ...

The Beauty & Benefits of Biophilic Design in the Built Environment

Biophilic design is a hot trend in design, but what is it and how can building professionals incorporate these strategies for the benefits of occupants? This eHandbook offers ...

The Benefits of Migrating from Analog to DMR Two-Way Radios

Are you still using analog two-way radios? Download this white paper and discover the simple and cost-effective migration path to digital DMR radios that deliver improved audio...