The TF243 series digital thermostat is designed for 3-speed fan and modulating valve control in a fan coil system, including: 2-pipe cooling only/heating only/manual changeover, ventilation mode, manual or automatic 3-speed fan control and modulating water valve control. Besides the basic controls, TF243 series provide Random Start-up Function to maintain power grid stability. In addition, Honeywell Memorized Time Off Function can automatically turn off the thermostat to save energy.

• Memorized time off
• Random startup
• Remote temperature sensor optional
• Energy saving mode optional
• LCD display with simple user interface
• Room temperature or setpoint temperature display selectable
• Manual or automatic fan speed selectable
• Temperature units in either °C or °F
• User setting can be stored when power loss
• Freeze protection function available
• Keypad lock options
• Heating and cooling setpoint limitation