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3.11 Defrost Light
The DEFROST light turns on when the unit is in defrost cycle
and indicates when the compressor is off.
3.12 Bypass Control
Below 90°F
- When the Phoenix R250 is used in
normal
dehumidifier operating
temperatures (below
90°F), the bypass cover
must close the bypass
openings
, figure 4. This
maximizes performance
by increasing the
amount of air that is
dehumidified across
the evaporator. This
temperature range is
often found during the
first 24 hours of a drying
job.
Above 90°F
- When the
Phoenix R250 is used
in high temperature
conditions above
90°F, reposition
the bypass cover
to open the bypass
holes, figure 5. This
improves dehumidifier
efficiency by increasing
the amount of airflow
over the condenser
and lowering the
refrigerant pressure.
Simultaneously, this
slows the airflow across
the evaporator allowing
the air temperature
to be lowered to the
dew point and increases dehumidifier capacity. These higher
temperatures are often found after the first 24 hours.
4 Maintenance
4.1 Air Filter
The Phoenix R250 is equipped with a pleated media air filter
that must be checked regularly. The
standard filter is a
MERV-11
high efficiency filter. Operating the unit with
a dirty filter will reduce the dehumidifier’s capacity and
efficiency and may force the unit into defrost causing the
compressor to cycle “off” and “on” unnecessarily. The filter
can generally be vacuumed clean several times before
needing replacement. Replacement filters can be ordered
from the manufacturer or purchased locally if available.
IMPORTANT: DO NOT operate the unit without the filter
or with a less effective filter as the heat exchanger and
coils inside the unit could become clogged and require
disassembly to clean.
4.2 Storage
There are two issues to consider when the Phoenix R250 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 button to reduce the water level in
the reservoir
2. Walk out the hose to drain it completely
In order to reduce biological growth flush the unit with a
biofungicide that is approved for use with copper, aluminum,
polyethylene and ABS. 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 pint of the chemical
through the top so that it drains into the heat exchanger
4. Use PURGE button to remove chemicals in reservoir. Run
PURGE until hose runs dry
5. Walk out hose to drain completely
6. Replace air filter
5 Service
WARNING: Servicing the Phoenix R250 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.
CAUTION: Do not operate unit without the front housing in
place.
5.1 Technical Description
The Phoenix R250 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.
Hot, high pressure refrigerant gas is routed from the
compressor to the condenser coil. 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
Figure 5: At or above 90°
Figure 6: Remove filter, snap grain
control cover into position shown, and
replace filter.
Bypass Cover
Bypass Openings
Bypass openings
located under filter
Figure 4: Below 90° (Normal)
Bypass Cover
