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    billhall14 Posts: 1, Reputation: 1
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    Oct 13, 2013, 05:52 PM
    HVAC Troubleshooting Questions for Free
    I am working on a train rooftop unit. It has a 3 wire control system. I have not dealt with this type of wiring before. I am a HVAC contractor, but this is foreign .Could you please explain how this system works

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