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  1. #1
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    Ice on evaporator



    We manufactured a refrigerated service case, with an evaporator who has fans. Our customer is using it for selling meat . And refrigerator must work at -3 degrees . And it causes ice on refrigeration. I made natural defrost 10 minutes every hour but it didnot solve the problem. So i used heaters to melt the ice. Do you have any experiences and solutions about this problem. Thamkyou



  2. #2
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    Re: Ice on evaporator

    If the room is to be -3 how do you expect the ice to melt below freezing/

    Yes the evaparator unit should be able to be fitted with heater kit. Contact supplier of evaparator and order it plus you may need new controller/ panel and additional wiring to suit.

  3. #3
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    Re: Ice on evaporator

    double post...
    Last edited by r.bartlett; 23-07-2012 at 10:45 AM.

  4. #4
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    Re: Ice on evaporator

    it is not a room. it is a refrigerated service case. for selling meat.

  5. #5
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    Re: Ice on evaporator

    .

    With meat also check the evaporating temperature of the refrigerant.

    If it is too low it will cause complications. Normal evaporators
    have about a ten degree differance over the coil but if you do
    this to fresh meat it can cause the meat to dry out, so the
    temp diff needs to be less.

    If it is a display case then it will defrost naturaly but if it
    is a cold room then it will need heat added to defrost.

    If it is a display then set the defrost for about 30 to 40 mins
    every four to six hours. But now you have put heaters in they
    will require less time.

    Regards

    Rob

    .

  6. #6
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    Re: Ice on evaporator

    thankyou Rob

  7. #7
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    Re: Ice on evaporator

    Quote Originally Posted by napter38 View Post
    thankyou Rob
    Your welcome.

    Oh by the way it is very common for manufacturers to run
    meat cases, deli, dairy and such like (air off down to
    about -5 deg C) with off cycle defrost and you were correct
    in the first but you did not allow enough time for the defros
    to happen.

    Remember if the coil is iced up as the air flow passes over the
    coil and defrosts it the air off the evap is still suficiantly low
    so that there is no noticable differance in case temp.

    That is why off cycle defrost needs to be for a longer time
    and times of 45 mins are not unusual......

    Regards

    Rob

    .

  8. #8
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    Re: Ice on evaporator

    we were using digital thermostat with one prob. I will change it with the thermostat which has two probs. Refrigerator will make defrost untill evaporator prob temp. is +8 deegrees

  9. #9
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    Re: Ice on evaporator

    Quote Originally Posted by napter38 View Post
    we were using digital thermostat with one prob. I will change it with the thermostat which has two probs. Refrigerator will make defrost untill evaporator prob temp. is +8 deegrees
    Yes, the best way is with two probes.

    Regards

    Rob

    .

  10. #10
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    Re: Ice on evaporator

    Or even better, use hotgas defrost.
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

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