EFC21-EU-01 Controller
 
The control EFC21 was developed for gas fired appliances that are connected to an exodraft chimney fan.

The control monitors the failsafe function and if there is not sufficient  draft, the EFC21 stops the gas supply to the appliance. This is to ensure that no gas enters the appliance.
 
When the EFC21 is activated the fan runs at full speed. If the flowmeter confirms that the airflow is sufficient then the fireplace can be lit and the speed of the chimney fan can be regulated to a pre-set value. The chimney fan stops when the EFC21 is turned off. However, it is possible to set a shut-off delay time of three minutes so that any residual particles can be extracted.

If the flue draft cuts off under normal operating conditions, the control automatically increases the speed of the fan to compensate for this difference. This may be the case, for example, on extremely windy days with the corresponding downward stroke in the flue system.

If the airflow is not sufficient, the EFC21 turns off the gas supply.

The control was developed in accordance with BS 5440: Part 1 (2000), BS 6644 (1991), Directive on gas appliances 90/396 / EEC, EN 298 (2003) and other relevant European standards.