The TF428 series digital thermostat is designed for 3-speed fan and valve control in a fan coil system, including:   

• 2-pipe cool only/heat only/manual changeover
• 4-pipe cool/heat manual /automatic changeover
• Ventilation mode
• Manual or automatic 3-speed fan control
• 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.

Features

• Memorized time off
• Cycle Per Hour (CPH)
• 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 with power loss
• Freeze protection available
• Four keypad lock options
• Heating and cooling setpoint limitation