2.10 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. 2.9) or B) stored where it is below 40°F and then started. Under these conditions, the unit will restart within several minutes; it may cycle several times until the unit warms up.
3 Maintenance
3.1 Air Filter
The Phoenix 200 MAX is equipped with a pleated fabric air filter that must be checked regularly. The standard filter is a
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.
4 Service
CAUTION: Servicing the Phoenix 200 MAX 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.
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
4.2 Technical Description
The Phoenix 200 MAX 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).
3.2 Storage
There are two issues to consider when the Phoenix 200 MAX is stored between uses and both pertain to the water trapped in the unit: damage caused by freezing or 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 & Fig. 4) to reduce the water level in the reservoir.
2.Stretch the hose flat to drain it completely. Walk under out of the hose to open end.
If the unit will not be exposed to freezing temperatures, an alternative to reduce biological growth is to flush the unit with a
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 heat exchanger
4.Hold in the pump purge switch to reduce the water level in the reservoir.
5.Flush with water.
Figure 2: Refrigeration system of Phoenix
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 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.
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