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Thread: ASHP Icing over

  1. #1

    ASHP Icing over

    Hi

    my ashp unit is completely freezing over on the rear grille and inside as well, its still running and keeping temperature.

    Is this normal, temp has dropped last night down South

    Thanks



  2. #2
    Simple answer "yes".

    Longer answer yes, because the heat pump takes so much heat out of the air that it cools damp air below the point at which the water in it will freeze. The build up of ice can damage the inflow heat exchanger (input grille thingy) so you can either fit a heater to combat this or turn it off when the air temperature is predicted to be that low.

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  4. #3
    Mine has a de-icer function on it to something like -5c.

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  6. #4
    It should if it freezes up it wont be heating it should i think automatically melt the ice (mine does) on the grill, when the ice covers the grill it wont be heating as no air will be passing through, takes a couple of minutes thaw it will then run as normal again for a while depending on the moisture in the air and will then freeze again, the water from melted ice should run into the drip tray, this can freeze up though which then as more ice melts more freezes in the tray, there was an optional extra I fitted on mine which was the facility to heat the drip tray, well worth it.

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  8. #5
    Extreme Koi Member Rank = Hassai Scamp's Avatar
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    Yep as above all normal, should defrost itself, then when done switches back to heating pond with big steam cloud!

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  10. #6
    Extreme Koi Member Rank = Sansai sammy66's Avatar
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    glad i put in a gas boiler and a rad in the filter house , no ice here

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  12. #7
    Just a point of clarification; not all heat pumps have a deicing feature so ice will continue to build on those that haven't until the inflow heat exchanger is damaged. I've seen units with solid blocks of ice several inches thick hanging out of them. Middleton's unit doesn't or it wouldn't have completely frozen over in the first place. For those types of heat pumps, it's best to fit a heater or to not use them when the air temperature is forecast to be lower than about 2C or 3C.

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  14. #8
    Thanks everyone, i have the Hydro-pro inverter unit, I have cleared the ice build up today and back up and running. Reading the instructions it has a defrost feature built in but this must be faulty.

    I will hopefully get someone out to look at it this week

    The whole grille was covered in about 10mm of ice

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  16. #9
    Heres a question.

    If you had an indoor koi pond and sited the ashp indoors with the cold air vented straight outside as far as I can see this should never freeze up, it would also help with condensation or nitrogen build up by pulling some air flow through the indoor building, I am guessing costs would be around the same as it will be stripping some heat at the same time as heating up the water when on.

    Stuart

  17. #10
    Whatever room or shed you have it in it would very quickly take the warm air out, would soon become an ice box.

  18. #11
    Im not sure it would

  19. #12
    I understand that if I tried siting it in a shed

  20. #13
    My thoughts are the air pulling through the building from outside will also pick up some ambient heat from the pond/interior of the building on its way into the ashp and as said the cold air vented through wall outside not back into the building

  21. #14
    Air source heat pumps pump huge quantities of air through themselves so, if the heat pump is in an enclosed space, it will remove the warm air very quickly, extract the heat from it and replace it with very cold air.

    If the heat pump is in a shed but exhausts the cold air outside, it will rapidly draw out the air in the shed and ventilation will draw in outside air at whatever temperature it is so the shed will be the same temperature as the outside. (The same will happen if the heat pump is outside but drawing its air from inside the shed through ducting etc.). So there is no advantage in doing this other than the initial few minutes.

    If the heat pump is in a room but exhausts the cold air outside, it will rapidly draw out the air in the room and ventilation will draw in warm air from the rest of the house. (The same will happen if the heat pump is outside but drawing its air from inside the room through ducting etc.). The heat pump obviously will be able to take more heat from a house in this way, but it will put a massive load on the house central heating, similar to having it on with all windows open on a windy day.

    Before I met him, one of my customers had a similar arrangement installed to heat his indoor swimming pool from heat in the plant room (within the house). His swimming pool was nice and warm but his heating bills for the house literally went up from about 400 per quarter to over 1,700 per quarter until I installed appropriate ducting and reduced his gas bill to about 500 per quarter i.e. the original 400 for the house plus a more realistic 100 fror his swimming pool and pool hall.

    Moral of the story - leave your heat pump where it was designed to be 'cos you ain't gettin' nuffink for nuffink.


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  23. #15
    Senior Member Rank = Hassai Tom Koi's Avatar
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    Hi Manky, I've a 2nd hand Duratec 10+, its not up and running yet as my pond isn't finished, if I wanted to see if its got a protective heater installed how would I find it and what does it look like, I'd rather check before I spend out on one and then find out that there's one already on it

    Cheers

  24. #16
    Thanks for the above.

    While I get the fact you wont get nuffink for nuffink I still cant see how it could possibly be any less efficient in an isolated fish house and would have the addedbenefit of removing nitrogen from filters such as shower and condensation ?.

  25. #17
    Quote Originally Posted by Tom Koi View Post
    Hi Manky, I've a 2nd hand Duratec 10+, its not up and running yet as my pond isn't finished, if I wanted to see if its got a protective heater installed how would I find it and what does it look like, I'd rather check before I spend out on one and then find out that there's one already on it

    Cheers
    Your Duratec +10 will be able to thaw the frost and it will melt into the drip tray. The drip tray can freeze though, the more frost that runs into the tray is added the ice berg it is creating. There is a drip tray heater you can fit though, have a look inside, there is a foil tray in the bottom below the condenser, if there is a length of what looks like braided wire laid in it the option is fitted.

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  27. #18
    Extreme Koi Member Rank = Hassai Scamp's Avatar
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    Hi, this is a drip tray heater I have fitted to mine...works fantastic last 3 years..
    https://www.heatpumps4pools.com/prod...ay-heater-kit/

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  29. #19
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    Ive got the heatpumpsforpools drip tray heater on my duratech 10 plus also. Installed it myself when the heat pump was new. it prevents the ASHP freezing up. Only downside is that it does use some extra electricity itself when temps are low.
    During the 'beast from the east' my heat pump worked fine and the area surrounding my ASHP was the only bit of garden without a couple of feet of snow.

    IMG_4750 by Lara Day, on Flickr

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  31. #20
    Moderator Rank = Supreme Champion Feline's Avatar
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    This picture shows the 'hot wire' fixed underneath the fins with aluminium tape on the drip tray

    IMG_3685 by Lara Day, on Flickr

    You do have to follow the instructions to connect it up to the right terminals since there a lot of stuff inside these things
    IMG_3683 by Lara Day, on Flickr

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