Question about Aprilaire 1700 Dehumidifier

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I have an Aprilaire 1750 installed inline with my upstairs central air system in the attic. The unit's ducting appears to be installed as indicated in the installation manual, but when the unit is running on very hot afternoons, it is sending hot air to registers that are being supplied by ducting hooked to the supply plenum directly across from where the conditioned air from the dehumidifier dumps in. This causes a 20 degree dif ference in air temperature coming from registers in different areas of the upstairs, Why am I getting this hot air from the dehumidifier?

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Your dehumidifier is likely working correctly. When operating and removing moisture, a dehumidifier will supply warm/hot air to your house. Your dehumidifier moves less air than your A/C, so your supply ductwork in your house is oversized for the dehumidifier. This will lead to uneven feeding of your supply duct branches with just the dehumidifier operating.

Since your dehumidifier is installed in the attic, make sure that the ducting connected to it is well insulated. Also make sure that your dehumidifier cabinet is insulated. These actions will help prevent heat gain from the hot air in your attic.

Is your dehumidifier bringing in fresh air from outside? If the outside air is hot and humid, the dehumidifier will supply warmer air to your home.

Some people run their A/C fans continuously to help with the air distribution, but this is a bad idea since it increases energy usage considerably.


Posted on Aug 06, 2010


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