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Fancoil controller for 2 or 4-pipe systems, gold, remote sensor input

Product Description

The TF428 RSBS/RSS series digital thermostat are designed for 3 speed fan and on/off valve control in a fancoil system, including:

  • 2-pipe cool only/heat only/manual changeover
  • 4-pipe manual/auto changeover(VC4013 valve only)
  • Ventilation mode
  • Manual or automatic 3-speed fan control
  • On/off water valve control

Besides the basic controls, TF428 RSBS/RSS series featuring CPH (Cycle Per Hour) better maintains the room temperature to the setpoint and Random Start-up Function helps maintain power grid stability. In addition, the Memorized Time Off function can automatically turn off the thermostat to save energy. 

Technical Properties

Protection class


Switch function/capacity


Temp. setpoint range 10 ... 32 oC
Control output signal

PI, on/off output 

Additional Descriptions
  • Auto Cycle times 100,000 times
  • Manual Cycle times 10,000 times
  • Display range 0 ~ 37C
  • Ambient storage limits -30 ~ +60C
  • Humidity limits 5~90% RH, non-condensing
  • Pollution Degree 2
  • Protection against electric shock class Class II
  • Rated Impulse Voltage: 2500V
  • Maximum Temperature for relay wiring 155C
Temperature control accuracy +/- 1 oC
Ambient temp. limit

0~ +49C 

Power supply

220/230VAC, 50/60Hz 

Product description

Fancoil controller for 2 or 4-pipe systems, gold, remote sensor input