Specialist in Climate Control Since 1945

Switchbox C12


Switchbox for Mark Calflo

Switchbox for controlling a Calflo with on/off fan based on room temperature with minimum inlet temperature restriction.


  • Steel box with cylinder lock
  • Regulator for the room temperature and minimum inlet temperature restriction using 2-10Vdc control signal
  • Selector for heat / off / ventilate
  • Digital time switch with weekly programme
  • Holiday switch to allow devices to operate at the night-time temperature over longer periods
  • Overtime timer adjustable from midnight to 6.00 a.m.
  • Failure lamps for:
    • Burner failure
    • Intake air failure
    • Burner fan thermally off
    • Maximum/gas pressure failure;
    • Dirty filter failure;
  • Operating lamps for:
    • Burner on
    • Burner in operation
    • Supply fan on
    • Release control
    • Reset button to reset a burner failure.
  • Voltage free contact to operate extraction (24Vmax)
  • Voltage free contact (supply to third parties) to check whether extraction is operating
  • A room temperature sensor supplied separately
  • A duct temperature sensor supplied separately for the minimum inlet temperature restiction

Order code

  • 3002233


Controls/to be applied for:

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