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  1. #1
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    Linde Integral Chillers with Sticking Relay


    Could anyone shed some light on this please.

    I have replaced a few relays which control the compressor on the above chiller. The relay sticks on causing the compressor to run continuously resulting in too low a temperature and eventually icing of the coil.

    Upon inspection of the relay, the contact are burnt and presumaly sticking them together causing the fault.

    Replace the relay and all is well. Some seem to last a while, others only a few months.

    The relay is rated at 16A and has about 6A running through it when operating.

    I presume the initial start current is what eventually ****s the thing up. Is that correct?



  2. #2
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    Re: Linde Integral Chillers with Sticking Relay

    Yep! Relay should be rated for 5-6 times higher current than FLA!

    If it is for PCB mounting, this is good one.

    If it is not than this is good one:
    Last edited by nike123; 06-01-2009 at 10:37 AM.
    Now, when I am officialy citizen off EU, I am looking for decent job! For any job offer please check my profile!

  3. #3
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    Re: Linde Integral Chillers with Sticking Relay

    Hi Tayters
    It sounds like a vibration problem, is there another problem with chiller causing excess vibration? U could use a solid state relay or isolate relays from vibration. Snubbers or suppressors could be used across coil to minumise spikes to control circuit. Almost forgot low coil voltage will also cause contacts to chatter.
    Last edited by Tesla; 06-01-2009 at 06:10 AM. Reason: Forgot something

  4. #4
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    Re: Linde Integral Chillers with Sticking Relay

    I just fit a smalll contactor to take the load of the comp after relay . No more problems.

  5. #5
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    Re: Linde Integral Chillers with Sticking Relay

    If it has 2 comps fit a timer .Set at about 1 min for delay.

  6. #6
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    Re: Linde Integral Chillers with Sticking Relay

    Thank you chaps.

    Also suggested to me was to fit a contactor (as suggested above) and link across any spare poles so all 3 of them take the current thereby reducing the load on each individual set of contacts.

  7. #7
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    Re: Linde Integral Chillers with Sticking Relay

    This has been a problem with Linde cases for years,I always used to replace these relays with a 16 Amp Contactor and never used to get a problem after that.

  8. #8
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    Re: Linde Integral Chillers with Sticking Relay

    Not just linde cases . Iv had it on verco cases too and very cheap cases

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