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.
