12
Ultra-Aire 90H Installer’s & Owner’s Manual
FOR HVAC INSTALLER AND HOMEOWNER
6. Maintenance
6.1 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.
6.2 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.
6.3 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.
7. Wiring Diagram
ULTRA-AIRE 90H WIRING DIAGRAM
115 VAC, 60Hz, Single phase
DEFROST
T-STAT
PUR
FAN RELAY
CONTACTS
AUTO
( N.C. )
ON
( N.O. )
24 VAC
115 VAC
FAN
FAN RELAY COIL
R
DEHUM
C
FAN
COMPRESSOR RELAY COIL
(YEL)
(BLU)
(GRN)
(RED)
