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Thread: Combining different 24 volt HVAC systems

  1. #1
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    Combining different 24 volt HVAC systems

    This is my first post/question. I'm trying to retrofit a historic home with smart technology. It's heating is a boiler with three zones controlled by 3 24V thermostats. The cooling is two zone with two complete systems, each controlled by its own 24V thermostat. One of the AC systems and one zone of the heating share a location for the thermostat, with both supplying their own red wire. Is it possible to combine the two 24V supplies? Only the AC provides a common. A Nest thermostat works, but I want to use one with Z-Wave capability. Is it possible to sync up power and common on different systems?

  2. #2
    Join Date
    Dec 2010
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    Tennessee NEC:2017
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    You would have better luck contacting someone in the HVAC industry.
    We are not allowed to help individuals not in the electrical industry, especially with DIY type projects.
    So I'm closing this thread according to our Forum rules.
    If you aim at nothing, you will hit it every time!

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