The TF428 series digital thermostat is designed for 3-speed fan and valve control in a fan coil system, including: 2-pipe cooling only/heating only/manual changeover, 4-pipe cool/heat manual/automatic changeover, ventilation mode, manual or automatic 3-speed fan control and water valve control. Besides the basic controls, TF428 series featuring CPH (Cycle Per Hour) better maintains the room temperature to the setpoint and Random Start-up Function would help 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