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

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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.

Comments

  • Harvey Ramer
    Harvey Ramer Member Posts: 2,281
    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: 2,281
    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: 741
    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: 16,971
    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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