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Thermostat Or External Temp. Controller

Discussion in 'Gear and Equipment' started by micblair, 9/7/12.

 

  1. micblair

    Well-Known Member

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    Posted 9/7/12
    Hi, just purchased a 215L Fisher Paykel chest freezer with a view to convert it to a keezer. As far as I can tell I have a couple of options:

    Replace the current thermostat with one from a fridge or aftermarket thermostat (http://negergy.com.au/products/freezer-to-fridge-conversion)

    or;

    Install a temperature controller.

    From what I could imagine, the digital controller gives you a reasonably accurate read-out of what the temperature is however I'm not so keen on having a cable/probe interrupting the seal on the freezer by using this type of modification.

    Just would like to hear peoples opinion or advice, on both options.

    Cheers
     
  2. Hippy

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    Posted 9/7/12
    Replacing the thermostat with a fridge one is a good idea as running a freezer as a fridge with the original thermostat will shorten the life of your compressor. The temp contoller will also give you better control. The probe wire is very thin and you will find with the weight of the lid on it there will be negligable leakage.
     
  3. Wimmig

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    Posted 9/7/12
  4. micblair

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    Posted 9/7/12
    Cheers, so should I do both in other words, or is replacing the thermostat sufficient?

    Also, does the thermostat need to be a specific model, such as a frost free one etc?

    One of the guys from appliances spares recommended a particular model thermostat (883712P) for my H215 freezer, but still advised against doing such a conversion because it probably wouldn't work (which sounds untrue from what I've read).
     
  5. Wimmig

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    Posted 9/7/12
    I'd just contact the seller directly. They seem to be universal type devices. Of course it'll work, it's basic electronics after all. I guess it'll only work as well as the job the person who installed it did.
     
  6. Wolfy

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    Posted 9/7/12
    Digital Temperature controller $15-25 on Ebay, easy enough to setup, should be very accurate and no need to mess with the workings of the freezer and is portable and easy to use on any similar setup.

    Set the freezer to maximum cold and let the controller do all the work, easy and work well for a large number of people on these and other forums.

    Edit: removed ebay links that may not have been suitable ( quick search gave 110V job, sorry )
     
  7. micblair

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    Posted 9/7/12
    So whats the consensus - will the compressor life cycle be affected by an external controller or??
     
  8. Wolfy

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    Posted 9/7/12
    No reason to think that if you get one with a compressor-delay on it, I think mine is set for 3 or 5 mins so that should not hurt the compressor at all.
     
  9. micblair

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    Posted 9/7/12
    Cheers, can you link me up the model your using, or is it the one off ebay, but the 240V variant?

    Edit:

    just found the instructions for the STC-1000, which answered my own question, re delay time...
     
  10. Wolfy

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    Posted 9/7/12
    240V model of the STC-1000 is what I use (and would suggest) as do many others - do a search and you will find a few large threads dedicated to the subject.
    I'm not sure if the cheaper (approx $15) Digital Controller has a compressor delay time or not.
     
  11. barls

    causer of chaos and mayhem

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    Posted 9/7/12
    I like the external controller due to the fact if the fridge or freezer shits it self it's just an unplug and plug into the replacement unit. Also doesn't void warranty on new units
     
  12. seemax

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    Posted 9/7/12
    Plus if you build a collar you can mount the digital controller on the face of it... unless you hate the look of it. Adjust temp without opening keezer or fiddling with the thermostat.
     
  13. gtsbrewer

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    Posted 9/7/12
    hey micblair, I have just purchased a 360litre frost free upright freezer to do the same. I have purchased a temp controller with heating and cooling modes from aliexpress.com cost 30 bucks free postage. I have placed this in a electrical junction box with the main power going to the box. on the box it has ur usual three pin plug therefore freezer and heating element plugs straight in to the controller box and the controller will switch on which ever is needed. i have not fermented in it yet but works well with out beer in it on my trail run.
    i have put some pics up however im at work so these are the only two pics i have. i will put the other in another post as its too big.

    P.S there is a relay in there as well

    so far the whole thing have cost me $120

    photo_1_.JPG
     
  14. gtsbrewer

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    Posted 9/7/12
    other pic :)

    photo.JPG
     
  15. Hippy

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    Posted 10/7/12
    I fitted one of these to my chestie. It comes with detailed instructions and is a hell of a lot easier than wiring a temp controller(which I've also done). I know nothing about fridges and it took me about 10 minutes.
    The compressor in a freezer is not designed to cycle over short periods of a few minutes like a fridge and a temp contoller alone will shorten the compressors life cycle.
    Go with both
     
  16. pcmfisher

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    Posted 10/7/12

    Why the relay?
     
  17. glenwal

    aus Bier hergestellt

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    Posted 10/7/12
    Completely false. Whilst it is true that the compressor is not designed for short cycles, using both will not achieve anything, and using one is not better than using the other.

    Temp controllers like the STC-1000 have a compressor delay built into them to prevent the compressor from cycling on/off/on/off, and neither of them will force the compressor to run for a minimum time.
     
  18. JaseH

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    Posted 10/7/12
    If you also change the allowable temperature variance on the unit to a degree or two and submerse the temp probe in a small sealed container of water, I cant see it would need to cycle the compressor that often. A small amount of water in a chesty isn't going to lose a couple of degrees in temp that quickly.
     
  19. micblair

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    Posted 10/7/12

    Cheers guys, noticed Keg King sells a couple of units for those of us who aren't electircal engineers or electricians, where the wiring has been done for you. Loses some of the steam punk appeal, but for $69 bucks, It's not too much for piece of mind.

    http://www.kegking.com.au/Temperature%20Co...%20Devices.html
     
  20. Wolfy

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    Interestingly that link (the way I read it) implies that the unit is not pre-wired for you, however, I've been in the shop and was sure I saw them all wired up in a box etc.
     

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