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Air Handlers for Hydro-Air

larry Member Posts: 91
Air handlers with programmed ECM motors are common in the gas furnace world. Are there any which have been designed specifically with residential hydronic heating in mind? It seems like it would make sense to have an air handler which would run at variable speeds depending on heating load requirements. You could get nice long runtimes and keep the air out of the registers warm enough for comfort. Wouldn't this make a good complement to outdoor reset controls?


  • TJ_3
    TJ_3 Member Posts: 24
    ECM hydro air

    Its been done before. I installed a Ruud air handler model UBHK 21J11NFA (no electric heat)with an ECM motor and a H2O Coil model AXW110-R. Its set up with a Weil McLain Ultra 105 boiler, also has a Tekmar indor outdoor reset controller (the system also controls a Veissman 50 gal indirect hot water heater and two zones of radiant heat)
    Use the Rheem / Ruud air handler becasue they are only 35 inches tall, that allows you the space for a Media filter underneath and still not run out of ceiling height
  • DaveGateway
    DaveGateway Member Posts: 568
    Most high end VS AC air handlers

    have a hot water coil option that just adds on to front of the AR plenum. As TJ mentioned, this probably makes the unit very long for some installs, especially vertical closet mounts where you'd like to keep the hydro-coil and humidifier in conditioned space.
  • larry
    larry Member Posts: 91

    TJ, Thank you for the info.

    Sounds interesting. Looked at a data sheet on the Ruud. Does this have any speed control based on return air temp? Rheem/Ruud have the know how for this as it's how they program the ECM motor in their modulating gas furnace. Any run on 120V (existing wiring to attic location isn't setup for 208/240V)?
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