Therma-Stor Products Group 300 owner manual Maintenance, Service

5. Replace the cover.

Change the timer pegs back to the original pattern for use above 50°F.

Above 50°F Below 50°F

Figure 1: Defrost Control Timer

2.11 Low Pressure Control

If the low side refrigerant pressure drops to 15 PSIG, the low pressure control opens and shuts off the compressor and blower. It is an automatically reset control. Its primary function is to prevent damage to the compressor if a leak develops in the refrigeration system. It may also open if the unit is A) used in a cool area (below 50°F) and the defrost timer is not adjusted (see Sec. 2.10) or B) stored where it is below 40°F and then started. Under these conditions, the unit will restart within several minutes. Until the unit warms up, it may cycle several times.

3 Maintenance

3.1 Air Filter

The Phoenix 300 is equipped with MERV-8 pleated fabric air filter that must be checked regularly. Operating the unit with a dirty filter will reduce the dehumidifier’s capacity and efficiency and may cause the compressor to cycle off and on unnecessarily on the defrost control.

Two optional filters are available: A) a 2” pleated filter that has the same efficiency as the 4” standard filter, but less surface area. This filter would need to be changed more often than the 2” version. B) a 95% efficient 4” filter that acts as an air scrubber to catch mold and mildew spores.

The 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 filter or with a less effective filter as the heat exchange coils inside the unit could become clogged and require disassembly to clean.

3.2 Blower Oiling

The blower motor is lubricated for life from the factory and does not require oiling by the owner.

3.3 Storage

There are two issues to consider when the Phoenix 300 is stored between uses and both pertain to the water trapped in the unit: damage caused by freezing and biological growth. The effect of the trapped water can be greatly reduced if precautions are taken to remove as much as possible before storage.

1. Use the pump purge switch (see Sec. 2.7 and Fig. 3) to reduce the water level in the reservoir.

2. Stretch the hose flat to drain it completely.

If the unit will not be exposed to freezing temperatures, an alternative way to reduce biological growth is to flush the unit with a bio-fungicide that is approved for use with copper, aluminum and polyethylene. To flush:

1.Run the hose to a drain.

2.Plug in the unit but do not turn it on.

3.Remove the air filter. Slowly pour a quart of the chemical through the top grille so that it drains into the white plastic slots.

4.Hold in the pump purge switch to reduce the water level in the reservoir.

4 Service

CAUTION: Servicing the Phoenix 300 with its high pressure refrigerant system and high voltage circuitry presents a health hazard that could result in death, serious bodily injury, and/or property damage. Only qualified service people should service this unit.

4.1 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.

4.2 Technical Description

The Phoenix 300 uses a refrigeration system similar to an air conditioner’s to remove heat and moisture from incoming air, and to add heat to the air that is discharged (see Fig. 2).

Hot, high pressure refrigerant gas is routed from the compressor to the condenser coil (see Figure 2). 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

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