THIS PAGE APPLIES ONLY TO THE ACTIVAIR ACE FAN HEATER

Element control
The elements may be controlled either:

• ON/OFF using a electromechanical relay (contactor)

• PHASE ANGLE control using electronic switching.

   

  Element currents

  Heater size	kW	6	10	13.2	20
  Single phase (240V)	A	25	42	55	84
  Three phase (415V)	A		14		28

Element current per phase for different models is given in the table opposite, whatever control method is chosen it must be current rated correctly.

Fan motor control
Speed control MUST NOT be used.

The fan motor may be switched on/off with the element assembly, or run continuously. Some systems incorporate an additional relay to:

• start the fan before the switching the elements on. This is useful in high humidity environments where moisture build up on the element ceramics may cause nuisance tripping of the element mcb.

• run the fan for a short period after the element switches off to purge residual heat, extending the elements lifespan.

The fan motor in all models (including 3phase heaters) is 240V, single phase, 50Hz. 1.8A full load current.

Operation of fan motor overload or over current protective circuits MUST disconnect the elements.

The cutout is rated 4A (resistive) at 240V. Operation of the cutout should immediately shut down the elements AND fan.

Earth
Activair fan heaters MUST BE earthed.  

Terminal connections
For 3 phase Activair electric fan heater:

In single phase heaters terminals 2 and 3 are omitted.

This example illustrates a basic wiring design for a single 3 phase electrical fan heater. It can be expanded on in several ways:

• Incorporate a time switch in series with the thermostat.
• Add a fan overrun relay to purge excess heat
• Replace the contactor with an electronic device. Note the fan will have to be controlled separately.
• Add fan motor overload protection. Note because the fan motor is less than 250W, in the UK overload protection is optional.

Activair control panels

• Rugged steel enclosure
• Isolator fitted with door interlock
• Element contactor
• Element over current protection (optional)
• Fan motor over current protection
• Fan mode switch - continuous operation or switch with elements
• Visual indication of fan running and elements on

The only external item required is a suitable thermostat, humidisat or time switch.

Control device

Activair manufactures electronic programmable thermostats specifically designed for use in harsh industrial environments, all of which are suitable for use with our heaters.

In addition we also supply a range of thermostats, humidistats and time switches from other manufacturers.