Bypasses and how to adjust them (or how to obtain a delta of 2°C for your heat pump).

To obtain a delta T value of 2 °C (temperature difference between the water input and output) required for correct operation of your heat pump, you will need to adjust the bypass.
In this example, the bypass valve is 100% open so the flow will be divided between the two hydraulic networks.

 

Closing this valve diverts the flow into the heat pump.

• If the delta T is too great: the flow in the heat pump is insufficient and we will therefore partially close the valve to increase the flow into the heat pump.
• If the delta T is too small: the flow in the heat pump is too strong, so we will partially open the valve to reduce the flow into the heat pump.

If the filtration system is equipped with a VSTD pump, the bypass should be set to the speed applicable for the longest during the day (changing the speed will change the flow, and therefore the delta T will not be the same).