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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthorBeardedMan
    • CommentTimeNov 21st 2016
     
    Hi All,

    I have a Vent Axia Sentinel Kinetic MVHR which I self installed and has been running since July. It is located in the loft and I did my first maintenance check a couple of weeks ago. I noticed water leaking out the front of the unit, as I investigated further I discovered the heat exchanger was full of water.

    I took it out and drained it and surprised at the amount of water it contained, checked the condensate pipe which was fine. I have run it since and again the heat exchanger is filling up with water, for some reason it is not releasing the water in the direction of the drain hole but instead it is accumulating in the heat exchanger and when full the water is coming out of the front of the unit.

    Can anyone give any guidance as to why this may be?

    Thanks

    BeardedMan
    • CommentAuthorDarylP
    • CommentTimeNov 21st 2016
     
    .... is the MVHR unit outside the thermal envelope of your house ? If so I would 'insulate' it first.
    I did not think you are supposed to install the units/HEs in a 'cold' loft? :confused:
    • CommentAuthortony
    • CommentTimeNov 21st 2016
     
    It should have a condensate drain, often in the form of a copper spigot to connect to a drainage pipe, they all collect condensation.

    It is OK to install in the loft.
    • CommentAuthorTimSmall
    • CommentTimeNov 21st 2016
     
    If you temporarily boost the fan speed, does is chuck the water out of the condensate drain? I'd guess surface tension is keeping it in the exchanger, maybe something like a mild detergent would help (e.g. soap), but I'd guess Vent Axia technical will say no (maybe not tho - they've been helpful when I've contacted them in the past).

    Tim.
    • CommentAuthortony
    • CommentTimeNov 21st 2016
     
    you could try tipping the unit very slightly towards the drain outlet, is there some kind of a siphon mechanism in the machine?
    • CommentAuthorsnyggapa
    • CommentTimeNov 21st 2016 edited
     
    I would ask whether the heat exchanger is installed the right way round - I have a recollection of arrows on the unit should align with arrows inside the case (mine were stuck on with paper so could wear out if you wash it too often) - and perhaps if it is backwards that the geometry gets screwed up and the water is expected to flow uphill? I think the unit can be installed one of 12 ways (being hexagonal and can go in either way round). I don't know how many of those ways are "correct"

    Definitely worth a call to Vent Axia though

    -edit- see here, 45 seconds in the 2 black arrows pointing at each other

    https://www.youtube.com/watch?v=6HLTXFQMaN4



    -Steve
    • CommentAuthorBeardedMan
    • CommentTimeNov 21st 2016
     
    Thanks everyone for your suggestions.

    My unit did not come with the arrows, but I will try and rotate the heat exchanger and see if it helps.

    I will also give Vent Axia a call and see what they say
    • CommentAuthorborpin
    • CommentTimeNov 21st 2016
     
    Had a similar problem (with a different unit) and needed to tip the unit back by a couple of degrees.
    • CommentAuthoralex2504
    • CommentTimeNov 23rd 2016
     
    Had the same problem with my Vent Axia which is in uninsulated loft space. I could hear water splashing and when inspected the MVHR was full of water. Disconnected the hose on bottom of unit and black gunk came out of the unit, which was blocking the drain. Flushed out the drain and drain line and poured couple of caps milton sterilizing fluid into the unit and all was good again. When cleaning the filters (6 months) i pour a cap of milton into the drain and has been fine last couple of years.
    • CommentAuthorpaul81
    • CommentTimeNov 21st 2017
     
    Hi @BeardedMan, I'm having a similar problem with a recently installed Sentinel Kinetic Plus B unit.
    Did you get your issue resolved in the end?
    If so, how?
    Many thanks,
    Paul
    • CommentAuthorCWatters
    • CommentTimeNov 21st 2017 edited
     
    Blow through the condensate drain pipe to see if blocked?

    When I used to do a lot of camping spiders would seal themselves into the air intake pipe of our gas lights blocking them.
    • CommentAuthorpaul81
    • CommentTimeMar 8th 2018
     
    Hi CWaters,

    Sorry missed your reply! I can blow through the drain no problem.
    So the issue isn't a blockage there.
    When I disconnect the drain and run the fan on full speed I can see water being thrown out of the unit then. It just seems to be holding onto it when the fan is on low or normal speed.

    Thanks,
    Paul
  1.  
    Any suggestions for a slightly different problem? We have some condensation dripping through the case of our MVHR. It's in a cupboard in the house.

    As advised it's mostly rigid pipe with rigid insulation but the last 1m or so in the cupboard was done with flexi pipe. The condensation appears to be an issue at the very end where it connects to the MVHR.
    •  
      CommentAuthordjh
    • CommentTimeMar 9th 2018
     
    Posted By: Simon StillAny suggestions for a slightly different problem? We have some condensation dripping through the case of our MVHR. It's in a cupboard in the house.

    As advised it's mostly rigid pipe with rigid insulation but the last 1m or so in the cupboard was done with flexi pipe. The condensation appears to be an issue at the very end where it connects to the MVHR.

    Too vague. Which duct do you suspect? How is it all insulated and air-sealed? Have you opened the case and determined more precisely where the liquid is coming from?
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