JamesJJJ

Have now had a good look inside the unit and control panel, no dip switches. Reading through the manual again it looks like the 400/e is configured through the control panel. The 400/ec (I assume a higher model) looks like it has a control panel and the dip switches, presumably to allow finer tuning of the configuration. We ran the unit overnight on the min setting as usual and co2 reached a peak of 1543ppm. When we got up I switched it to normal mode (where the service measurements were taken) and co2 fell steadily to 876ppm in 2 hours. I then opened the outside door on our room and co2 fell to 434 in 25mins! Tonight we are going to try the normal setting and see what happens to co2 levels. At some point I want to test with the villavent completely off and see if co2 rises significantly higher.

Thanks, perhaps us gravitating towards the minimum setting is actually closer to optimal.

Scotland. House is 175m2, ceiling height is 2.6m. I had a look at the unit and it seems fairly straightforward, but I couldn't find the dip switches or rotary dial to check the current setting.

Thanks, that is a useful doc. Dont have the commission doc but do have the engineer report from when it was serviced. This shows flow rates in the 8-13 l/s for all rooms with the kitchen extract highest. This flow rate was achieved on 'norm' setting which is definitely audible... The filters look pretty black and dirty, I will try to get some replacements.

I think it is this: https://www.systemair.com/xen/Villavent-UK/Products/UnPublished/VR-400-EEC-warmtewiel-WTW/ Have ordered an air monitor so I can compare windows vs mvhr. I also need to work out how to make it quieter, my wife cannot sleep when it is running in normal mode. None of this is an issue now but I need to sort it before winter...

Thanks. Boost mode seems to add another 60-100w ontop of normal mode.

I completely get the benefit of mhrv in the winter, but I am struggling to see the same in summer. We recently moved into a house which has a villavent system installed, it has been serviced recently and is working to spec. I noticed high energy usage and tracked it down to the villavent. In normal mode (with summer bypass) it is chewing through approx 130w and in minimum mode approx 60w. It is also noisy at 130w. In the winter I can understand that heat loss would outweigh the power consumption, but in summer I can open a few windows and get fresh air with 0 cost? Is this level of power consumption typical for a 5 bed system, or is it pointing to a potential issue? Tia,