7
Ultra-Aire 100V Installer’s & Owner’s Manual
FOR HVAC INSTALLER AND HOMEOWNER
6. Maintenance
6.1 Standard Air Filter
The Ultra-Aire is equipped with a pleated cloth air filter. This filter
should be checked monthly. 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 a filter access panel from one end
of the Ultra-Aire. To remove the filter access panel from the Ultra-
Aire, pull the panel straight up about 1⁄2" until the bolt heads near
the bottom of the panel are centered in the larger opening of the
keyhole slots. Next rock the bottom of the access panel away from
the Ultra-Aire and lift the access panel straight up to remove the
tab on top of the panel from the slot in the top of the Ultra-Aire.
The filter should be readily visible and can be removed by pulling it
straight out of the Ultra-Aire.
The pleated cloth filter can generally be vacuumed clean several
times before needing replacement. Replacement filters can be
ordered from the factory or purchased locally if available. 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.
6.2 High Efficiency Air Filter
An optional high efficiency pleated microglass paper filter is
available for the Ultra-Aire. 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, and placed directly beneath the standard filter.
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
attempt to clean the high efficiency pleated paper filter. It should be
replaced when it becomes restrictive (See Figure 7).
7. Service
CAUTION: Servicing the Ultra-Aire with its
high pressure refrigerant system and high
voltage circuitry presents a health hazard
which could result in death, serious bodily
injury, and/or property damage. Only qualified
service people should service this unit.
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 for warranty claim
authorization and technical assistance.
7.2 Technical Description
The Ultra-Aire 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 3).
Hot, high pressure refrigerant gas is routed from the compressor
to the condenser coil (See Figure 3). 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 cause 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 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.
7.3 Troubleshooting
Neither fan nor compressor running. Dehumidification is being
called for. No fan call.
1. Unit unplugged or no power to outlet.
2. Humidity control set too high.
3. Loose connection in internal or control wiring.
4. Defective Compressor relay.
5. Defective control transformer.
Compressor is not running. Dehumidification is being called
for. No fan call.
