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Weather Compensation & Load Compensation Controls

How it works

Weather Compensation (WC) controllers work by adjusting the boilers flow temperature in relation to the outside air temperature, insuring the lowest possible flow temperature is delivered into the heating system at all times. This helps to the boilers operation in condensing mode, maximising boiler efficiency and saving energy consumption whilst increase comfort levels within the property.

An outside sensor is fitted to the fabric of the building on a North or North West facing wall. The sensor registers the outside temperature and sends this information to the boiler, the boiler uses this to determine what temperature the flow should be set to, as the outside temperature increases or decreases so does the flow temperature. The aim is to keep the inside temperature constant or within a set parameter controlled by the controller, set up correctly users would not notice the weather has changed outside.

Heating Curves and Slope

The heat curve is what most weather compensation controllers use to determine what temperature the flow should be set to in relation to the outside temperature. Adjustments to the heat curve and slope are to be made when setting up parameters within the controller, information can be obtained from a graph in the manufacturer’s instructions (MI’s) to understand what settings should be used. This may be a process of adjustment over some time to hit the sweet spot.

Thermal insulation used within in the property is an important factor when setting up any heating system, it determines what temperature the boiler should operate at to reach the desired target room temperature.

Poor thermal insulation would result in higher heating curves. Improving the thermal insulation within the property and adding lagging around the heating pipework will help lower temperatures further.

Next article Pipework Insulation

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