willo air pump flow settings

[flying_squirall]

Hi All.
I have an air to water heating pump and wondering what settings should I choose on the flow control device.
The options are:
- Variable differential pressure
- Constant differential pressure
- Constant

I have a mixed heating system with underfloor heating downstairs and radiators upstairs.

Thanks a lot.

Control Modes And Functions; Operating Button; Variable Differential Pressure Δp-V; Pressure Δp-V - Wilo -Para Series Installation And Operating Instructions Manual [Page 9]​

Wilo -Para Series Manual Online: control modes and functions, Operating Button, Variable Differential Pressure Δp-V, Pressure Δp-V, Constant Differential Pressure Δp-C, Pressure Δp-C. Recommended For Two-Pipe Heating Systems With Radi- Ators To Reduce The Flow Noise At Thermostatic...

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