BACnet Communicating Thermostat for Modulating Fan Coil Operation Now Available

Nov. 22, 2021
BACnet-compliant communicating thermostats ensure effortless integration.

Contemporary Controls now offers BACnet-compliant wired or wireless communicating thermostats suitable for modulated 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, Sales Manager at Contemporary Controls. “By providing modulated control, the thermostats work with FCUs to provide a more consistent and comfortable environment within a building.”

The new models join Contemporary Controls’ popular BASstat Communicating Thermostat series. They are BACnet compliant [KN1] to ensure seamless integration into a BACnet/IP (Wi-Fi) or BACnet MS/TP (EIA-485) networks.

The BAST-421C-B2 wired thermostat (BTL Listed) is BACnet MS/TP connected utilizing an EIA-485 serial connection. The BAST-421C-BW2 wireless thermostat is BACnet/IP connected using a wireless connection to a nearby Wi-Fi router/access point which supports IEEE 802.11b/g/n.

Both models provide modulated heating and cooling control in an attractive wall-mounted enclosure with a large LCD display. Intended for use with 4-pipe heated/chilled water FCUs, the thermostats can control 2 analog modulating water valve actuators and one binary supply fan. A large and easy to read LCD display indicates setpoint, space temperature, and current mode of operation using graphical icons.

The thermostats help 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. 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 the occupants. Three sensing options are available: built-in temperature sensor, input for remote temperature sensor, or temperature override network command from Building Automation System. Occupancy status can be set from thermostat buttons, a wired ESI input, or over the BACnet network. Thermostat buttons can be locked to prevent tampering. Digital display with graphical icons is easy to read and understand.

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