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Mitsubishi MLZ-KX ceiling cassettes pulling in attic air — anyone dealt with this?

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cclabuesch
cclabuesch Member Posts: 2
in A-C, Heat Pumps & Refrigeration

Have three Mitsubishi MLZ-KX ceiling cassettes (two 6,000 BTU, one 9,000 BTU) installed as part of a 4-zone H2i system. All three units are drawing in air from the attic when running — detectable by a strong attic smell from the vents. Installer came back and added sealant which helped but didn't fully resolve it.

Has anyone seen this with the MLZ-KX specifically? Where did the fix end up being?

Comments

  • pecmsg
    pecmsg Member Posts: 7,218

    unless the outside air port is open that shouldn’t happen.

    Big Ed_4
  • Kaos
    Kaos Member Posts: 907

    Looks at the final post here on how to seal it up properly. The rigid should be sealed with canned foam to the drywall and joists. You want a nice air tight insulated lid over the unit in the attic.

    https://forum.heatinghelp.com/discussion/154437/help-with-proper-sealing-of-ceiling-cassette-in-attic

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