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  1. #1
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    Time delay for multi compressors



    Hi,

    Need another opinion.

    I'm in the process of installing some large split a/c systems to a building. Four of the systems are linked to one controller (looped together-one master and three slaves) These are 16 kW each. When the controller is activated, all the compressors are going to start at the same time, which I don't want to do, because each time they start up, the lights will dim.

    I had thought about making a control system, mounted on a DIN rail linked into each of the compressors to give a time delay on the load side of the contactors, but noticed that there are some manufacturers-Eberle and Aspen who make time delay controls at a decent price.

    I can't decide what to do. They are 3 phase systems 415VAC, so can anyone recommend a product to do the job for me please.

    Regards
    James


    a problem shared is a problem halved

  2. #2
    Brian_UK's Avatar
    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
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    Re: Time delay for multi compressors

    Depending on the manufacturer some have a built-in time delay to provide load shedding on start up; check with them first.

    You idea of a time delay on the load side of the contactor ?? Do you mean to interupt the 3 phases ?

    Surely it would make more sense to to put them in the contactor coil circuit.....

    You could fit ON DELAY timers to each contactor with different times on each one ?

    Your move....
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

  3. #3
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    Re: Time delay for multi compressors

    Hi Brian,

    I don't think there is a facility built in, and yes it would probably make more sense to place on the contactor coil-that was my other option once I have the coil voltage and amps etc.
    a problem shared is a problem halved

  4. #4
    shogun7's Avatar
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    Re: Time delay for multi compressors

    Try this: http://www.icmcontrols.com/ This seems to be a simple solution to tie into control contactor
    ICM 105 | Ideal For Compressor Staging
    Low holding current
    Low cost version of the ICM102 without the cooling anticipator circuitry
    Ideal for compressor staging
    Universal voltage operation
    Knob-adjustable time delays
    Simple 2-wire hookup & up to 10 min adj timing

  5. #5
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    Re: Time delay for multi compressors

    Hi Guys,

    Subject "Time delay on multiple compressors"

    Anyone else come accross these stupid Norpe integral daries that use a light tube starter as a time delay to bring on the second compressor. I know these units are made cheap so they sell more by surely they can come up with something better than that

    Regards

    Raymond

  6. #6
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    Re: Time delay for multi compressors

    Hi Iceman,
    Looks like you've been busy.
    A serial timer is the ultimate solution, simple and cheap.

    I usually use the Supco TD 69, you can get it everywhere in the UK.

    You only need a few seconds TD between the compressors.

    Good luck.

    Chemi

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