Eric Mele is back and this time we cover hot gas as a dehumidification strategy with all of the broad strokes you should be aware of. Hosted by Bryan Orr.

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10 thoughts on “Hot Gas Reheat Dehumidification

  1. Ray Ray says:

    In a hospital setting, I have them use a reheat electric coil both before and after the coil. I told them why don't you just put in a dehumidifier coil in the air handler. The ahu was just heating and coiling an electric room to keep moisture out of the room. I didn't understand why they were doing this?

  2. Edward Hvacr says:

    100 percent OA unit you see them in medical research building pharmacy .They take in 100% air in & they exhaust 100% air .They recovery building exhaust air to preheat the pre coil and reheat on all AHU for labs

  3. Walter Rojas says:

    Doing TAB we started seeing this a ton on RTUs in 2018, one manufacture in particular. I have to say it's pretty crazy how no one is ever on the same page with these package units in general. The engineer provides his sequence, the unit manufacture has their sequence and the controls are always interface only, but are expected to fully control the unit. I had a rep come out to perform his dehumidification mode testing, four hours later and six phone calls later he never got it to work. On a different unit serving VAVs that's supposed to provide 55 degree discharge air, the thing was stuck in dehum mode providing 70 degree, running the fan full blast with 4"wc of static in the ductwork and he didn't see anything wrong with that, during testing we found static pressure setpoint would be 1.35"wc. Had another unit single zone, that was controlling based on outside air temp instead of space temp. During the winter, the thing was stuck in dehum mode and using the electric reheat full blast, the space temperature was 87 degrees. We're in SE TX, very humid climate so most of these units are stuck in dehum mode. He left and said that nothing was wrong and all equipment was running properly.

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