Fitting fans to a fridge

Discussion in 'Fridges & Ovens' started by Hymie, Aug 6, 2016.

  1. Hymie

    Hymie Funster

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    Due to an underperforming fridge over the recent hot weather I have Purchased 2 X 120mm fans, which will be switched individually so I can test performance.

    My question to the panel is, where do I fit them on the fridge vents.

    1 top and 1 bottom, both sucking, lower blowing in and upper sucking out?

    Any help gratefully received.

    Hymie
     
  2. Minxy Girl

    Minxy Girl Funster Life Member

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    Good question, I'm going to do the same but can't remember either! :D
     
  3. Robert Clark

    Robert Clark Funster Life Member

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    Fit them both to the top
    I attached mins to the ton vent with cable ties and then used a quick release cable plug in case the vent needed removing
     
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  4. Hymie

    Hymie Funster

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    Both blowing out then Robert?
     
  5. Robert Clark

    Robert Clark Funster Life Member

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  6. Speve

    Speve Funster

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    Do these fans make a noticeable difference as there seems to be information on fitting etc but have seen no reports on whether they have any effect?
     
  7. Robert Clark

    Robert Clark Funster Life Member

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    Also - I used a computer fan cable splitter which enables me to plug both fans into a shared power supply, so that if either of the fans packs up I only have to unplug the faulty unit.
     
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  8. DBK

    DBK Funster

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    You want them blowing out for safety. If they are blowing in they could blow fumes into the vehicle. It also makes sense as hot air rises so sucking at the top just helps the natural convection current. But I fitted mine close to the evaporator (the finned bit) not in the vent itself because that is some distance away from the back of the fridge in our vehicle. But if the evaporator is just behind the vent you should be fine. I only fitted one but am going to buy a second.

    P8080011.jpg
     
  9. Robert Clark

    Robert Clark Funster Life Member

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    They're only useful if it's above 25 degrees C outside. Above this temperature a Dometic fridge can lose performance. I heard this direct from a Dometic service engineer.
     
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  10. Tootles

    Tootles Funster

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    I fitted two mini computer fans at the back, but set them on 'blow'. They pull air over the top of the fridge, and are directed at the cooling vanes, as DBK has shown. Started doing this about ten years ago with the narrowboat fridge, marked difference in actuation time of the fridge switch on/off cycle. Powered from the 12 volt takeoff from the fridge itself. (used 12volt fans instead of 5.5 volts).
     
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  11. matamoros

    matamoros Funster

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    I have just bought 2 120mm computer fans for the fridge and whilst I know where to fit them I am a little at sea as to the electrical connection.

    How do I wire a digital thermostat or a surface mounted switch to enable one fan or two, is there a standard colour for the 12v feed to the fridge which powers the light as opposed to the main 12 volt feed which is only activated when the engine is running.

    Where do I buy the digital thermostat or surface mounted switch a google search as not found a suitable switch. I did try and buy a kit but everyone is out of dtock.
     
  12. Littlewheels

    Littlewheels Funster

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    Dometic actually produce a fan and thermostat, I've just ordered one through a Dometic Engineer though I am not sure of the exact cost.
     
  13. Hymie

    Hymie Funster

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  14. matamoros

    matamoros Funster

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  15. Robert Clark

    Robert Clark Funster Life Member

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  16. Robert Clark

    Robert Clark Funster Life Member

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    I connected my thermostat to a totally different supply than the fridge or fridge light.
    I connected mine to a power supply I found in my Toilet Casette cabinet. Used a multimeter to check the correct polarity as my van is German. Blue was live and black is Negative. I fitted a 1a Lin line fuse too.

    I bought one thermostat on EBay - the other identical one from Amazon

    Hope this makes sense
     
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  17. Nirvanauk

    Nirvanauk Funster

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    @Littlewheels do you have a kit number or anything like that I could use please?
     
  18. DBK

    DBK Funster

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    There's a link on here to the thermostat I bought: http://www.motorhomefun.co.uk/forum/threads/fridge-cooling-fan.113667/
    The problem with the fans is getting the polarity right, they don't run backwards if you connect them the wrong way round - they just die in my experience having burned out two before I realised this! For the electrical supply I can only suggest poking around with a cheap multi-meter to find a suitable supply and check what it does when the ignition is turned off.
     
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  19. Baggers53

    Baggers53

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    I am just in the process of fitting 3x SATA 90cm computer fans to the upper vents on my
    Dometic fridge.
    I am using WAGO spring lever push fit connectors. I know they are a little pricey
    but should anything fail, or I may want to modify this arrangement then its simple
    to open these connectors and change the set up.
     
  20. Hymie

    Hymie Funster

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    Thanks Robert, I did realise my mistake when the confirmation email came through, I will alter it this morning,

    I won't go down the fan in fridge route as my fridge is the original antique that came with the van 25 years ago.

    Hymie
     
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