FTX återvinningsaggregat

Hey!
I hope english works fine here? We bought a house that was built 1993 and has had the same värmeåtervinningsaggregat in the basement since then. We changed it half year ago to systemair ftx.
my question is…in winter when its around -6 outside we sat the temperatur on the little screan to 28gr and a normal flow. It seems to be working because the air in the basement is stable 20gr. But in the house it gets cold to 13gr unless we use extra element or make fire in kamin. Is that normal or are we doing something wrong?
thank you for answers,

mvh, Veronika

 

I think we have a VSR300 or 500.
why is there a temperature option to go up to 30gr? What is that temperature connected to?

 

thank you for the previous answer

 

Thank you for your answer. It seems like it is activated since the heat symbol is on and its set up for 28 gr. Any idea?

 

Air is heated by hot water from a waterheater through a box that has a radiator and an extra fan to push the air out in the basement. we tend not to use the fan because its expensive

 

We already have FTX aggregat