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    Which 2 or variable speed Heat Pump condensers can use old 2-wire connection to the air handler?

    rsilvers
    rsilvers Member Posts: 182
    in A-C, Heat Pumps & Refrigeration
    Which 2 or variable speed condensers can use old 2-wire connection to the air handler?

    I heard that Trane has such a unit. It is hard to pull new wire to this location. Need the system to be a heat-pump to qualify for the large rebate.

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    Comments

    • Harvey Ramer
      Harvey Ramer Member Posts: 2,261
      This will do the trick and give you more options. 
      https://www.fast-stat.com/
    • rsilvers
      rsilvers Member Posts: 182
      Excellent tip. I should have thought of that as I installed two of their units for thermostats before.

      I may want a variable speed inverter condenser though - and I think that means a communicating system with data. So far, only Trane seems to do that with two wires.

      For distributors I use FWWebb or SupplyHouse, and neither does Trane, so looking for other options. Or I could just get a two-speed and use Fast-Stat.
    • rsilvers
      rsilvers Member Posts: 182
      This is a full inverter that goes down to 25% power and is non-communicating, which probably means it can somehow work with the Fast-Stat. It is the weekend or else I would be calling them.

      https://www.morleyassociates.com/wp-content/uploads/2021/03/02-EODA18H-4860-Submittal-20191015-1.pdf
    • rsilvers
      rsilvers Member Posts: 182
      Goodman makes a 2-wire communicating full inverter, so that is an option.


    • Harvey Ramer
      Harvey Ramer Member Posts: 2,261
      Daikin SkyAire or VRV4s uses 2 wire communication. It's available with a vertical airhandler. 
      http://daikinac.com/content/light-commercial/skyair/skyair-system-heat-pump/
      rsilvers
    • Larry (from OSHA)
      Larry (from OSHA) Member Posts: 733
      The Bryant/Carrier inverter AC (5 stage) is 2 wire and I think the heat pump is too. Installed one last season and works very well.
      rsilvers
    • ChrisJ
      ChrisJ Member Posts: 16,568
      The Goodman system I installed in my own house has the option for a 2 wire communicating setup but I've never used it.

      The only reason I didn't use it was I didn't want to have to use their re-badged thermostat. I don't remember who made it, but I didn't want to be locked into only using that one. So, overall a very minor, maybe even silly reason.

      Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

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