Description
Honeywell TC300B-G Commercial BACnet Thermostat The Honeywell TC300B-G is a highly configurable 24 VAC commercial thermostat and HVAC controller designed for fan coil units, heat pumps and conventional heating and cooling systems. The TC300B-G integrates directly with building automation systems through BACnet MS/TP or Modbus RTU over RS485, making it an excellent choice for commercial HVAC applications requiring centralized monitoring and control. A 2.4-inch capacitive color touchscreen, onboard temperature and humidity sensors, flexible inputs and outputs, and extensive fan and valve configuration options allow the TC300B-G to support a wide range of commercial HVAC equipment. TC300B-G Specifications Manufacturer: Honeywell Part Number: TC300B-G Series: TC300 Product Type: Commercial Communicating Thermostat / HVAC Controller Supply Voltage: 24 VAC Operating Voltage Range: 20–30 VAC Frequency: 50/60 Hz Communication: BACnet MS/TP Communication: Modbus RTU Network Connection: RS485 Display: 2.4" Capacitive Color Touchscreen Display Resolution: 320 × 240 Built-In Temperature Sensor: Yes Built-In Humidity Sensor: Yes Operating Temperature: 32°F to 122°F Operating Humidity: 10–90% RH, Non-Condensing Maximum Combined Digital Output Current: 4A Color: Gray Compatible HVAC Applications The Honeywell TC300B-G supports multiple commercial HVAC configurations, including: 2-pipe fan coil units 4-pipe fan coil units 2 Heat / 1 Cool heat pumps Water-source heat pumps 1 Heat / 1 Cool conventional systems Multi-speed fan applications Variable-speed fan applications On/off valve control Floating valve control Modulating valve control 6-way valve applications BACnet MS/TP & Modbus Integration The TC300B-G is designed for integration with commercial building automation systems. It communicates over RS485 using: BACnet MS/TP Modbus RTU This allows facility managers and building-control systems to monitor thermostat operation, setpoints and HVAC equipment through a central BAS. Fan Coil Unit Control The TC300B-G can control both 2-pipe and 4-pipe fan coil units and supports a variety of fan and valve configurations. Applications can include: Multi-speed fans Variable-speed fans Modulating heating and cooling valves Floating-control valves On/off valves 6-way valves Dehumidification with reheat Color Touchscreen Display The Honeywell TC300B-G features a 2.4-inch capacitive TFT touchscreen with a 320 × 240 pixel display. The thermostat also uses a color LED ring to indicate system operation: Blue for cooling Orange for heating Built-In Temperature & Humidity Sensors The TC300B-G includes onboard sensors for both: Room temperature Relative humidity Honeywell specifies temperature accuracy of approximately ±1.5°F over the full operating range, with improved accuracy in typical occupied-room temperatures. Is the TC300B-G a Wi-Fi Thermostat? No. The TC300B-G is the wired communication version of the Honeywell TC300 family. It connects to a building automation system using RS485 with BACnet MS/TP or Modbus RTU. For Wi-Fi and BACnet IP connectivity, see the Honeywell TC320B-G. What Is the Difference Between TC300B-G and TC320B-G? Both models are 24 VAC commercial thermostats designed for fan coil, heat-pump and conventional HVAC systems. TC300B-G BACnet MS/TP Modbus RTU RS485 wired communication TC320B-G BACnet MS/TP Modbus RTU Wi-Fi BACnet IP Bluetooth Honeywell Connect Me app support Choose the TC300B-G when wired BAS communication is required and the TC320B-G when Wi-Fi or BACnet IP connectivity is needed. Common TC300B-G Applications The TC300B-G is well suited for commercial HVAC installations including: Office buildings Hotels Schools Hospitals Apartments and condominiums Retail facilities Commercial fan coil systems Building automation systems Need Help With TC300B-G Configuration? Memphis Control Center supplies Honeywell commercial thermostats, building controls and HVAC control components. Contact Memphis Control with your fan coil unit, heat pump or BAS requirements if you need help confirming whether the TC300B-G is the correct thermostat for your application.
