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  1. #1
    Join Date
    Mar 2007
    Posts
    182

    York RTU Z-Bus issue

    We hava an issue with a York RTU (D1CW300N24046FDA) which has a factory installed UNT controlling it. The mixed air and vortex dampers are controlled out of the zone bus of the UNT and don't seem to work.

    We have never done any installs using the zone bus for anything so i have limited knowledge.

    The UNT has been replaced, actuators have been switched with a functional unit and they work in that unit, and they say the wiring has been verified to have no issues (having them pull a new temporary wire to verify that because it sounds like they covered all the bases already).

    Can anyone offer up suggestions on this? The problem started a few months ago with another tech working on it that no longer works here but i'm pretty sure my answer at that point was to call York

  2. #2
    Join Date
    Jun 2009
    Location
    StL, MO
    Posts
    588
    Do you have access to the UNT, i.e. HVACpro or a front end?

    My first thought is the UNT isn't seeing fan status (BI-4).
    UA LU 562

  3. #3
    Join Date
    Mar 2007
    Posts
    182
    With some adapters and such they connected the damper to the stat-bus RJ12 connector and were able to stroke it. Wired up normally, the vortex damper goes wide open and the mixed air dampers stay closed.

    This is why i suspect an issue with the wiring. Of course he decided to only do a half-asses test with a temporary wire so i think i have to go check it myself.

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