Therma-Stor Products Group 90H Maintenance, Standard Air Filter, High Efficiency Air Filter

FOR HVAC INSTALLER AND HOMEOWNER

7. Maintenance

7.1 Standard Air Filter

The UA-90H is equipped with a MERV 11 media filter. This filter should be checked every three months. Operating the unit with a dirty filter will reduce dehumidifier capacity and efficiency and may cause the compressor to cycle off and on unnecessarily on the defrost control.

DO NOT operate the unit without the standard filter or with a less effective filter than the standard filter. The heat exchange coils inside the unit could become clogged and require disassembly to clean. Filter non-compliance invalidates the product warranty.

7.2 High Efficiency Air Filter

Most filters are labeled with a MERV rating number, which measures a filter’s ability to trap particles ranging in size from 3.0 microns to 10.0 microns. Residential filters commonly have MERV ratings of 1-12. The higher the MERV rating, the more efficient the filter is, and the more particles it can filter.

The UA-90H comes with a standard MERV 11 filter. A MERV rating of 11 means the filter is 85% to 95% minimum efficient at capturing the measured particles. For greatest filtration and efficiency of the UA-90H, it is recommended the air filter be replaced every three months with a MERV 11 rated filter.

7.3 Optional Fresh Air Intake

Check and clean the screen on the outdoor fresh air intake port seasonally. The screen may become plugged during the seasons when there are many particles in the outdoor air.

18 Ultra-Aire 90H Installer’s & Owner’s Manual