Therma-Stor Products Group Ultra-Aire 100V Maintenance, Service, Standard Air Filter, Fan Oiling

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).

6.3 Fan Oiling

The fan motor is factory lubricated for many years of normal operation, however, periodic oiling will extend motor bearing life. To oil, remove the plastic cap from the two oiling tubes extending from the unit above the nameplate. Locate the oil ports on the motor as indicated in Figure 6. Add 3 to 5 drops of SAE 20 nondetergent oil to each port every 6 months. DO NOT use thinner oil or penetrating oil; fan life can actually be decreased by such oil.

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

No dehumidification, neither fan nor compressor run with fan switch and ventilation timer OFF.

1.Unit unplugged or no power to outlet.

2.Humidity control set too high or defective (Sec. 3.3 & 5.7A)

3.Loose connection in internal or control wiring.

4.Defective Compressor relay.

5.Defective control transformer.

17 Ultra-Aire 100V Installer’s & Owner’s Manual