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  1. #1
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    Johnson Controls HELP



    Ok another problem

    I am trying to work out an old johnson control it has a circle setpoint knob. With the cover off there are 4 terminals. As you turn the knob you have cooling, deadzone and heating.

    I have 2 wires, compressor and reversing valve(heating) on cooling you want output for compressor and for heating you want output for compressor and reversing valve.

    when you turn the knob and engage the 3 different settings you get continuity between the different terminals, it sounds simple,but its not, how do you get power on compressor on both heat and cool but not on dead zone, and how do you get power on the reversing valve just on heat, not on deadzone or cool.

    Its an old Johnson Controls Australia P/L product.

    PLEASE HELP!



  2. #2
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    Re: Johnson Controls HELP

    Sorry budy, we need a bit more info...

    How many terminals do you have and which ones are active at which setting?

    In other words...

    Cool - terms 1 and 2 linked
    DZ - 1, 2, 3 open
    Heat - 2 and 3 linked

    Or something similar.

    Cheers
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

  3. #3
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    Re: Johnson Controls HELP

    Ok, its an old johnson controller, it has Penn on the front cover.

    There are 6 terminals, the bottom two are the commons,

    Gotta have power to the compressor in cooling mode, nothing to either comp or reversing valve in dead zone and power to both in heating mode. You turn the setpoint knob to get to each mode.

    I was ready to kick the crap old thermostat off its bracket

    Teacher wont just show me how its wired, (i am at college) I am gonna ring one of the techs during college and have them tell me how to do it over the phone. (Unless somone here tells me how to do it) I was ready to deck the teach, i was so frustrated.

    What is it with tech teachers?

  4. #4
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    Re: Johnson Controls HELP

    Quote Originally Posted by MadApprentice
    Ok, its an old johnson controller, it has Penn on the front cover.

    There are 6 terminals, the bottom two are the commons,

    Gotta have power to the compressor in cooling mode, nothing to either comp or reversing valve in dead zone and power to both in heating mode. You turn the setpoint knob to get to each mode.

    I was ready to kick the crap old thermostat off its bracket

    Teacher wont just show me how its wired, (i am at college) I am gonna ring one of the techs during college and have them tell me how to do it over the phone. (Unless somone here tells me how to do it) I was ready to deck the teach, i was so frustrated.

    What is it with tech teachers?
    What about doing a search on the Johnson Controls site and downloading the info on this controller

    probably wiser than kicking ten bells out of the instructor

    Go forth and learn the experience will do you good some night you have been called out at 3 in the morning

    Kind Regards Andy
    If you can't fix it leave it that no one else will:rolleyes:

  5. #5
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    Re: Johnson Controls HELP

    Hi Mad

    I thought you were going back to tech college with a new "learning" attitude.

    Getting the answers for free won't teach you much at all.

    Get down to the library or search the manufacturers web sites for info - oh, and order up some CHILL PILLS while you're at it

    Learning takes time, and patience (a logical way of thinking always helps as well)

    Is this the one? http://cgproducts.johnsoncontrols.co...DF/2497165.PDF
    Last edited by frank; 18-08-2006 at 07:52 PM.

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    Re: Johnson Controls HELP

    G'day Mad Apprentice.

    Which unit are you working on. Petes a **** like that. smart dude but. Is it the APAC unit?

    One of them has a time delay. But u can bypass the delay by shorting the jumper pins on the circuit board.

    It Took us a while to work the bloody thing out too. I'm pretty sure it will be missing a link wire. 1-4 I think.

    You guys only have a week to go no?




    Regards

    DOGMA

    Say Hi to Brendon from Orfords if he's in your class.

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    Re: Johnson Controls HELP

    MadApprentice

    howdy mate , here is a vital clue for the unit you are working on.

    easy way to find the circut on the thermostat is to disconnect all cables , from it , turn it on , now check the voltages at each of the six terminals , in heating cooling , the bottom 2 are always 240v

    a big clue is 1 of these terminals has 52v instead of 240
    the 52v terminal is the dead zone terminal , from there you will have to put a bridge in to call for power.


    good luck champ. Go the temperzone


    Dogma 2 wks to go champ , we'll be at the races telling stories in no time.
    Last edited by fridg; 20-08-2006 at 09:57 AM.
    The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman.

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    Re: Johnson Controls HELP

    [quote=fridg]easy way to find the circut on the thermostat is to disconnect all cables , from it , turn it on , now check the voltages at each of the six terminals
    [quote]

    Correct me if I'm wrong, but if you disconnect all cables - where is the voltage coming from?????

  9. #9
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    Re: Johnson Controls HELP

    [QUOTE=frank][quote=fridg]easy way to find the circut on the thermostat is to disconnect all cables , from it , turn it on , now check the voltages at each of the six terminals

    Correct me if I'm wrong, but if you disconnect all cables - where is the voltage coming from?????
    Sorry frank


    the power comes straight from the mains , to a push button isolation switch , to the thermostat , the cables from the thermostat then run to the unit.

    So virtually you can isolate the unit while still having power go to the stat.



    By the way MAD , what group are you in A, B, C
    The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman.

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    Re: Johnson Controls HELP

    Hey all, sorry bout not updating my progress, i worked it out.... kind of.

    I have all my pracs signed off now, just got a couple of exams to go!!! The temperzone was a prick, the apac was easy to work out. (did it in 5 minutes)

    Thanks forthe help all!

    Ps i noticed the 52v, did u connect the reversing valve there or the compressor?

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    Re: Johnson Controls HELP

    Quote Originally Posted by fridg View Post


    By the way MAD , what group are you in A, B, C
    reversing valve.

    see ya next year hey
    The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman.

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    Re: Johnson Controls HELP

    HEy Frig

    Youhave obviously finished lucky you. I have two exams left. Both are resits so i will be finished tomorrow wether i like it or not.

    i will probably do one exam in the morning and one in the afternoon. Back to work friday, on the drink friday night.

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    Re: Johnson Controls HELP

    Yea i am finished. but i am hanging around til the end of the block.

    Mate look for the bloke in the heatcraft hat , thats me come say gday.
    The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman.

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    Re: Johnson Controls HELP

    Rightio, I am going in tomorrow to sit a last exam, i will hopefuly be signed off by 10am

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    Re: Johnson Controls HELP

    Ps are you the fello whos missus used to work in a "night club" and yo have two kids?

  16. #16
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    Re: Johnson Controls HELP

    No thats not me.

    But i know who you are talking about.

    Study up for that exam champ , think logical
    The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman.

  17. #17
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    Re: Johnson Controls HELP

    I FINISHED MY EXAMS!!!
    ps fridge are you the fello who stayed at the pup?

  18. #18
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    Re: Johnson Controls HELP

    Quote Originally Posted by MadApprentice View Post
    I FINISHED MY EXAMS!!!
    Well How did you do?

  19. #19
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    Re: Johnson Controls HELP

    Quote Originally Posted by MadApprentice View Post
    I FINISHED MY EXAMS!!!
    ps fridge are you the fello who stayed at the pup?
    Yep ,glad to get out of the box , but i would still rather be down there learning more.

    What exam did you resit ?

    who were you not simon are you ?

    Was waiting to have a yarn to you on friday
    The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman.

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