Ultra-Aire SD12 Installer’s & Owner’s Manual
16
6. Maintenance
6.1 Standard Air Filter
The Ultra-Aire SD12 is equipped with a pleated cloth air filter. This
filter should be checked every six 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.
To access the air filter, remove the filter access panel from the end
of the Ultra-Aire SD12. The filter should be readily visible and can
be removed by pulling them straight out of the Ultra-Aire SD12.
The pleated cloth filter can generally be vacuumed clean several
times before needing replacement. 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 – MERV 14
An optional high efficiency pleated microglass paper filter is
available for the Ultra-Aire SD12. This filter is rated as 90%-
95% efficient by the ASHRAE Dust Spot test method 52-76. The
high efficiency pleated microglass paper filter should be used in
conjunction with the standard filter. The filter housing is a seperate
accessory that must be used with the MERV 14 filter. An additional
MERV 11 pre-filter is sold with the filter housing.
This filter is able to remove allergy causing particles from the
airstream. The high efficiency filter has a much larger surface area
than the standard filter, thus the standard filter may need to be
cleaned or replaced several times before the high efficiency filter
requires replacement. Be careful not to damage the fabric media
when handling the high efficiency pleated paper filter. Do not at-
tempt to clean the high efficiency pleated paper filter. It should be
replaced when it becomes restrictive.
6.3 Impeller Fan
The impeller fan motor is factory lubricated for many years of
normal operation, and no further oiling is required.
6.4 Optional Fresh Air Return
Check and clean the screen on the outdoor fresh air return
seasonally. The screen may become plugged during the seasons
when there are many particles in the outdoor air.
6.5 Condensing Unit Maintenance
The compressor and fan motor inside the condensing unit are
permanently lubricated for many years of normal operation, so
maintenance is not required.
Keep the condensing unit clean and free from debris. Check the
coil and other openings on the condensing unit for debris that will
obstruct airflow. The coil on the condensing unit can be carefully
vacuumed or cleaned with a soft bristle brush if needed. Do not
FOR HVAC INSTALLER ONLY
bend the coil fins while cleaning the coil.
Keep the area around the condensing unit clear to allow the required
airflow. Make sure the base of the condensing unit is at least 1” above
ground level and that the condensing unit is level. Do not direct the
discharge towards the condensing unit when mowing grass.
7. Service
7.1 Warranty
A warranty certificate has been enclosed with this unit; read it before
any repair is initiated. If a warranty repair is required, call the factory
first at 1-800-533-7533 Ext. 8459 for warranty claim authorization and
technical assistance.
7.2 Technical Description
The Ultra-Aire SD12 uses a refrigeration system similar to an air
conditioner’s to remove heat and moisture from incoming air, and add
heat to the air that is discharged (See FIGURE 16).
Hot, high-pressure refrigerant gas is routed from the compressor to
the condenser coil. The refrigerant is cooled and condensed by giving
up its heat to the air that is about to be discharged from the unit. The
refrigerant liquid then passes through a filter/drier and capillary tubing
which causes the refrigerant pressure and temperature to drop. It next
enters the evaporator coil where it absorbs heat from the incoming air
and evaporates. The evaporator operates in a flooded condition, which
means that all the evaporator tubes contain liquid refrigerant during
normal operation. A flooded evaporator should maintain nearly constant
pressure and temperature across the entire coil, from inlet to outlet.
The mixture of gas and liquid refrigerant enter the accumulator after
leaving the evaporator coil. The accumulator prevents any liquid
refrigerant from reaching the compressor. The compressor evacuates
the cool refrigerant gas from the accumulator and compresses it to a
high pressure and temperature to repeat the process.
FIGURE 16: REFRIGERATION SYSTEM
Summary of Contents for SD12
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