4
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Above 90°F
- When
operating the Phoenix
R175 above 90°F,
reposition the bypass
cover to open the bypass
holes, figure 4. This
improves dehumidifier
efficiency by increasing
the amount of airflow
across the condenser.
This also slows airflow
across the evaporator
giving the hotter air
more time to reach
dew point, thereby
increasing dehumidifier
capacity. These higher
temperatures are often
found after the first 24
hours of a drying job.
4 Maintenance
4.1 Air Filter
The Phoenix R175 is equipped with a pleated media air filter
that must be checked regularly. The standard filter is a MERV-
8 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. 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
R175 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 R175 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 R175 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
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.
Figure 4
Remove filter, snap bypass cover into
position shown, and replace filter.
Bypass Cover
Bypass Openings
Bypass openings
located under filter
