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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