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Solved: modifying my freezer

Discussion in 'Do It Yourself (Not Computer-Related)' started by wiggyy, May 6, 2010.

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  1. wiggyy

    wiggyy Thread Starter

    Joined:
    Apr 2, 2008
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    I want to modify a domestic Zanussi freezer so that it can be used to store cold drinks in.
    Is it possible to install a refrigerator thermostat instead of the freezer stat so that the temperature can be regulated at around +5-6 degC
    Any one got any ideas?
    Thanks.
     
  2. hewee

    hewee

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    57,793
    So how did this get Solved?
     
  3. jiml8

    jiml8 Guest

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    Fridge controls for the most part use a bulb of gas and set the temperature using a membrane switch that switches state based upon the pressure of the gas.

    That gas bulb will be on the end of a capillary tube, so the sensing can be remote - up to the length of the capillary tube.

    The temperature ranges that these devices work over tend to be fairly narrow - given their function, this is acceptable.

    To do what you want to do, you'll probably have to obtain a different temperature controller that will control in the temperature region that you want to use and wire it in.

    The refrigeration system will be designed to operate with the evaporator coil temperature below freezing. This will be sub-optimum for your purpose; if the temperature is to be controlled above the freezing point, then probably the humidity inside the unit will be higher than expected, and as a consequence, the evaporator coil will tend to freeze up. If the unit is self-defrosting, this could be OK, but you might have to run the defrost cycle at more frequent intervals than would be required if it was operating normally.

    This would probably require a different defrost timer.

    Another alternative would be to remove some refrigerant from the system so that the pressure was lowered and it didn't cool as much.

    Any of these solutions will work, but all will reduce the unit's efficiency. Removing refrigerant COULD shorten the life of the unit if you don't do it exactly right (you don't want to take any oil out, just refrigerant). Also, removing refrigerant requires special tools.
     
  4. wiggyy

    wiggyy Thread Starter

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    Many thanks.
    Wiggyy
     
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