Pete Posted January 3, 2021 Share Posted January 3, 2021 More moving questions folks!! Whilst sat having my coffee I notice you can feel air movement around my feet. It feels like a draft and just wondered if this is the norm with mvhr? Where I am sat is in a space from living room to large open dining/kitchen and the supply air comes into the lounge and the extraction is in the kitchen. I new it would flow this way but did not realise I would feel a draft. The mvhr is a vent axia sentinel which I have just switched on and not balanced yet. It shows 30 to 35% fan speed so i am going to have a look at the setting up controls but just wondered what/how people have set theirs up? I have also noticed that the supply vents feel cool when I put my hand near them, is that normal? I know most people run them on a really low setting but some experiences would be beneficial to understand how to run ours. TIA Link to comment Share on other sites More sharing options...
MJNewton Posted January 3, 2021 Share Posted January 3, 2021 Does the apparent draft stop with the MVHR turned off? Link to comment Share on other sites More sharing options...
ToughButterCup Posted January 3, 2021 Share Posted January 3, 2021 41 minutes ago, Pete said: ... Whilst sat having my coffee I notice you can feel air movement around my feet ... is that normal? ... Tryin' to tell us you are sitting starkers while having a coffee? This weather? Brave lad. Link to comment Share on other sites More sharing options...
Pete Posted January 3, 2021 Author Share Posted January 3, 2021 21 minutes ago, MJNewton said: Does the apparent draft stop with the MVHR turned off? Yes. My head is absolutely mashed at the moment and I am struggling to get my head round all the new technology ( I am nearer 60 than 50). I have a pile of booklets relating to mvhr, ashp, shower controls, ovens, tv's, etc and it is mind boggling. The mvhr is bad enough but I have managed to reduce the normal run rate to 20% and this has made a difference so will wait and see how this goes. Feeling cool/cold air is not what I expected but may be this is the norm, what do other people experience is what I am trying to understand as I have nothing to compare it to? Link to comment Share on other sites More sharing options...
Pete Posted January 3, 2021 Author Share Posted January 3, 2021 15 minutes ago, ToughButterCup said: Tryin' to tell us you are sitting starkers while having a coffee? This weather? Brave lad. If you want to fantasize about me Ian feel free as I have enough on my plate trying to do technology than worry about your needs!! In fact after 3 years it is bloody marvellous to be sat having a coffee and trying to switch off all things self-build in my mind!! Link to comment Share on other sites More sharing options...
MJNewton Posted January 3, 2021 Share Posted January 3, 2021 (edited) I've not noticed drafts arising as a result of our MVHR, but then of course there has to be some air movement between rooms as that is required for it to properly function so it may just a case of me not having noticed it (perhaps by virtue of the fact ours might not be running as fast as yours). Regarding the temperature of the outlets do remember it is not a heating system and so any moving air below body temperature has the potential to have a cooling effect when felt immediately after exit (it'd soon mix with the ambient air at ceiling level). Furthermore, with it not operating at 100% (not far off though - ours seems to generally hover at >90%) the air it pumps in will always be slightly cooler than the air it sucks out. The limited volume and heat capacity of air though means it shouldn't be noticeably cooling the house down much (and certainly nowhere near what a trickle vent admitting untempered outside air in would). Edited January 3, 2021 by MJNewton 1 Link to comment Share on other sites More sharing options...
Russell griffiths Posted January 3, 2021 Share Posted January 3, 2021 Are you feeling it at low level due to the gap under a door close to you, my extract system in another house sucks air under a door that you could fly a kite in the draft, open the door and you would never notice it, it just seems concentrated on that 10mm gap so feels more powerful than it is. 1 Link to comment Share on other sites More sharing options...
Gone West Posted January 3, 2021 Share Posted January 3, 2021 (edited) 4 hours ago, Pete said: More moving questions folks!! Whilst sat having my coffee I notice you can feel air movement around my feet. It feels like a draft and just wondered if this is the norm with mvhr? Where I am sat is in a space from living room to large open dining/kitchen and the supply air comes into the lounge and the extraction is in the kitchen. I new it would flow this way but did not realise I would feel a draft. The mvhr is a vent axia sentinel which I have just switched on and not balanced yet. It shows 30 to 35% fan speed so i am going to have a look at the setting up controls but just wondered what/how people have set theirs up? I have also noticed that the supply vents feel cool when I put my hand near them, is that normal? I know most people run them on a really low setting but some experiences would be beneficial to understand how to run ours. TIA If you have a narrow gap under a door then the air will move faster and it is possible to have a slight draught for that reason. I think a minimum gap of 10mm is usual. The air from the supply vents will always be a degree or two cooler than the air in the room so will always feel cooler. You can fit a small post heater to overcome the heat loss if you find it uncomfortable. Setting it up correctly will probably result in reduced air flow. I put a section in my blog about commissioning my MVHR system. Some cross posting with Russell. Edited January 3, 2021 by PeterStarck 2 Link to comment Share on other sites More sharing options...
ProDave Posted January 3, 2021 Share Posted January 3, 2021 No draughts from ours at normal rate unless you stand on a stool right by a vent. Full boost mode when showering is a different matter, quite noisy and I can feel a draught on my (bald) head in places. 1 1 Link to comment Share on other sites More sharing options...
Pete Posted January 3, 2021 Author Share Posted January 3, 2021 12 minutes ago, Russell griffiths said: Are you feeling it at low level due to the gap under a door close to you, my extract system in another house sucks air under a door that you could fly a kite in the draft, open the door and you would never notice it, it just seems concentrated on that 10mm gap so feels more powerful than it is. No doors involved. I think it is like my ASHP and getting it set up right but it is not my forte being patient!. I have reduced the normal airflow to 20% rather than 30% and this has made a difference Link to comment Share on other sites More sharing options...
ToughButterCup Posted January 3, 2021 Share Posted January 3, 2021 7 hours ago, Pete said: If you want to fantasize about me Ian feel free as I have enough on my plate trying to do technology than worry about your needs!! ... Thats turned my Sunday night dram of single malt sour in my mouth .... need another to wash out the taste. Link to comment Share on other sites More sharing options...
SteamyTea Posted January 3, 2021 Share Posted January 3, 2021 Is it too late to fit and extra extract in the living room to balance the flowrates there? Link to comment Share on other sites More sharing options...
Pete Posted January 3, 2021 Author Share Posted January 3, 2021 13 minutes ago, SteamyTea said: Is it too late to fit and extra extract in the living room to balance the flowrates there? No, no and no but thanks for the idea. Feet up and tools are put away (at the mo) Link to comment Share on other sites More sharing options...
Pete Posted January 3, 2021 Author Share Posted January 3, 2021 1 hour ago, ToughButterCup said: Thats turned my Sunday night dram of single malt sour in my mouth .... need another to wash out the taste. You started it!? Link to comment Share on other sites More sharing options...
Pete Posted January 4, 2021 Author Share Posted January 4, 2021 Right just an update on all things mvhr. Massive difference to the drafts now the unit is running at 20% instead of 30% so not as much air being moved around and the house is staying warmer for longer without the need to have the heat pump on. The house has stayed at 19.5 degrees for nearly 24 hours without the heat pump coming on so I am gradually getting my head round the way things work. Link to comment Share on other sites More sharing options...
SteamyTea Posted January 4, 2021 Share Posted January 4, 2021 You need to get the system balanced and the correct airflows. Then it will be cheaper to run, quieter, no noticeable drafts and feel just as fresh airy. Link to comment Share on other sites More sharing options...
ToughButterCup Posted January 4, 2021 Share Posted January 4, 2021 24 minutes ago, Pete said: ... The house has stayed at 19.5 degrees for nearly 24 hours without the heat pump coming on .... That's a good result. Jezza of Blessed Memory said it took him about a fortnight of fiddling about with his settings. Link to comment Share on other sites More sharing options...
Pete Posted January 4, 2021 Author Share Posted January 4, 2021 50 minutes ago, SteamyTea said: You need to get the system balanced and the correct airflows. Then it will be cheaper to run, quieter, no noticeable drafts and feel just as fresh airy. I realise this but have two rooms to finish plastering and then I can finish the balancing. 34 minutes ago, ToughButterCup said: That's a good result. Jezza of Blessed Memory said it took him about a fortnight of fiddling about with his settings. The way I am shaping I will break that record easily! Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now