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Need wiring diagram for 1980's 3 ton package unit

My 70y old dad wants me to take 2 carrier 3 ton package units and make a good one. the wire diagram is gone on both units i was electrican, comerical new buildings, he started with out me and unpulged and moved motors, coil ,transformers i just need a wire diagram were all wire's plug in to

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  • Reeferman
    Reeferman May 11, 2010

    Model numbers might help!


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I assume you know if this is correct voltage and single or 3 phase, and whether it will fit your application or not, how is the duct work going to attach, how many people will be in the conditioned area, what is the building made of, how much insulation is has...

A little more to it than just "turn it on".


If you get the models and serial and can contact the manufacturer or their representative you might get a wire diagram. Most any package unit would do. As long as you keep the original equipment controls. If you "patch" it up it may be hazardous by not having safety's where it was designed for. Or for instance It may have a anti freeze thermostat. By passing this could lead to coil freeze up and compressor damage. Leaving out a pressure switch (if any) may do the same or could become dangerous to people in the event of fan motor failure. A low temperature fan speed switch may not be needed now unless you plan to run the AC in below 55'f.
And a few dozen other factors that might need to be considered.


If you feel confident after this then contact carrier.

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Posted on May 19, 2009

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