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The UNISTER electronic draft regulator is designed to control the temperature of a solid fuel boiler by opening and closing the flap regulating the air supply to the firebox. Additionally, the device controls the activation of the circulation pump in central heating systems.
COMFORT SYSTEM Function
The built-in COMFORT SYSTEM function in the controller prevents the circulation pump from being blocked by scale deposits between the pump impeller and stator. The controller automatically turns on the circulation pump outside the heating season for about 30 seconds every 14 days.
FROST PROTECTION Function
The controller protects the central heating system from freezing by permanently turning on the circulation pump when the sensor temperature drops to 4 °C or lower.
BOILER OVERHEAT PROTECTION Function
The controller protects the central heating boiler from overheating in case of sensor failure. In this situation, the circulation pump will be turned on permanently.
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