Pocster Posted January 6, 2023 Posted January 6, 2023 It’s been been a while ; so perhaps I haven’t noticed . Inlet valves in rooms I can feel a definite air flow . Outlets ( to the outside ) ; so bathrooms etc. I can feel nothing at the vent . Even a piece of tissue infront the vent doesn’t stutter . This correct ? . Though if I take a shower the mvhr kicks in - so I assume working ???
JohnMo Posted January 6, 2023 Posted January 6, 2023 I can't feel anything at my extract points but if I put a sheet of toilet roll at the terminal the air flow holds it there. When did you last check the filters? Do you have filters in the extract terminals, if so you should be changing 6 to 12 monthly.
Pocster Posted January 6, 2023 Author Posted January 6, 2023 16 minutes ago, JohnMo said: I can't feel anything at my extract points but if I put a sheet of toilet roll at the terminal the air flow holds it there. When did you last check the filters? Do you have filters in the extract terminals, if so you should be changing 6 to 12 monthly. Changed the filters 3 months ago - they were filthy
Pocster Posted January 6, 2023 Author Posted January 6, 2023 11 minutes ago, ProDave said: Has it been balanced with an anemometer? No . Even I did that - how do I adjust airflow from outlets ?
dpmiller Posted January 6, 2023 Posted January 6, 2023 what style of outlets are they? Some screw in and out, some systems need orifices changing, and then you've got overall fan speed too.
Pocster Posted January 7, 2023 Author Posted January 7, 2023 (edited) 11 hours ago, dpmiller said: what style of outlets are they? Some screw in and out, some systems need orifices changing, and then you've got overall fan speed too. I’ve taken an outlet off . Still struggling to feel any air movement. But as I said , if I have a shower it doesn’t take long for the mvhr speed to ramp up - so it’s seems to be sensing humidity . Edited January 7, 2023 by pocster
JohnMo Posted January 7, 2023 Posted January 7, 2023 If the system isn't balanced, perhaps it just needs balancing? Any photos of the nozzle assembly, also the manifold?
Pocster Posted January 7, 2023 Author Posted January 7, 2023 6 minutes ago, JohnMo said: If the system isn't balanced, perhaps it just needs balancing? Any photos of the nozzle assembly, also the manifold? Will post photos later . How do you balance the system ?
dpmiller Posted January 7, 2023 Posted January 7, 2023 as above, airflow at each terminal and overall fan speed need controlling for both supply and extract. Plus any overhead you fancy to guarantee positive or negative pressure overall... 1
Pocster Posted January 7, 2023 Author Posted January 7, 2023 9 minutes ago, JohnMo said: If the system isn't balanced, perhaps it just needs balancing? Any photos of the nozzle assembly, also the manifold? So as a test to prove it’s all working could I block all outlet valves ( plug them ) and just leave the bathroom one open . I’m assuming then I should definitively feel air being drawn out as only 1 outlet valve in use .
Pocster Posted January 9, 2023 Author Posted January 9, 2023 Sorry for the delay! About 15 mins after a shower. Outlet have a tiny flow ( even though fully open )
Pocster Posted January 9, 2023 Author Posted January 9, 2023 I completely closed all inlet vents underground apart from 2 outlets MVHR is now going for it!! But still feel very little airflow at the bathroom outlet for example....
Pocster Posted January 9, 2023 Author Posted January 9, 2023 Strange!. Removed all the inlet caps and it's returned to normal speed . Outlet ones didn't appear to change
Pocster Posted January 9, 2023 Author Posted January 9, 2023 I checked and replaced the filters . Atmosphere in almost black ! Air out ; grey with dust . So it seems to be working; but the airflow out in room is hardly there ….
Mr Punter Posted January 9, 2023 Posted January 9, 2023 You are more likely to notice the supply air than the extract air. The supply air will feel slightly cooler. Have you commissioned the system so the valves are set up for the correct flows?
Pocster Posted January 9, 2023 Author Posted January 9, 2023 29 minutes ago, Mr Punter said: You are more likely to notice the supply air than the extract air. The supply air will feel slightly cooler. Have you commissioned the system so the valves are set up for the correct flows? I haven’t tbh . But the inlet valves the airflow is obvious . The outlet valves is so slight it’s almost unnoticeable. I’m fairly certain ( from a year ago when we moved in ) you could feel the outlet valves airflow . What would you suggest I do to ‘check’ the outlets ??
Mr Punter Posted January 9, 2023 Posted January 9, 2023 They do it with an anemometer. There was one on BH that went from person to person, but you can also hire them. 1
Pocster Posted January 9, 2023 Author Posted January 9, 2023 9 minutes ago, Mr Punter said: They do it with an anemometer. There was one on BH that went from person to person, but you can also hire them. But should the outlet airflow be SO slight ???
dpmiller Posted January 9, 2023 Posted January 9, 2023 Unless you've got an anemometer you don't know if it *is* slight. @Conor are you finished with mine? looks like @pocster could do with one for a bit... 1
Conor Posted January 10, 2023 Posted January 10, 2023 11 hours ago, dpmiller said: Unless you've got an anemometer you don't know if it *is* slight. @Conor are you finished with mine? looks like @pocster could do with one for a bit... Oh yeah. Need you to give you a call about it. Can't get it to work. 1
MJNewton Posted January 10, 2023 Posted January 10, 2023 @pocster Can you remove one of your extract valves? If so, do so and put your hand up inside it - perhaps in a small fist if you've got room - and I suspect the air flow will be much more noticeable.
Pocster Posted January 10, 2023 Author Posted January 10, 2023 31 minutes ago, MJNewton said: @pocster Can you remove one of your extract valves? If so, do so and put your hand up inside it - perhaps in a small fist if you've got room - and I suspect the air flow will be much more noticeable. Did exactly that - got my fist right up in it . Definitely feel the ‘pull’ a bit more - so I guess it’s working ….?
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