Therma-Stor Products Group 200 MAX User Manual

4

If the low side refrigerant pressure drops to 5 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.

The Phoenix 200 MAX is equipped with a pleated fabric air 
filter that must be checked regularly. The standard filter 
is a MERV- high efficiency filter. 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.
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.

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.
.  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 bio-fungicide that is approved for use with copper, 
aluminum and polyethylene. To flush:
.  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.

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 -800-533-7533 for 
warranty claim authorization and technical assistance.

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).

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.

Figure 2: Refrigeration system of Phoenix