4
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If the evaporator temperature does not reach the desired
temperature, the compressor will start after 15 minutes.
The system will start a timed defrost cycle. The timed
defrost cycle ensures the unit will continue to remove
water from the air in cool ambient conditions.
2.13 Automatic Bypass Control
The Phoenix 270HTX senses the ambient conditions during
normal operations. The bypass door automatically moves
into the correct position maximizing performance and
efficiency depending on inlet conditions.
3 Maintenance
3.1 Air Filter
The Phoenix 270HTx is equipped with a pleated fabric 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 cause the compressor to cycle off and
on unnecessarily on the defrost control.
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.
3.2 Storage
There are two issues to consider when the Phoenix
270HTx is stored between uses. 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. Raise one
end above your head and spool to drain water out of
the other 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:
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.
4 Service
CAUTION: Servicing the Phoenix 270HTx 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 Technical Description
The Phoenix 270HTx 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.
The mixture of gas and liquid refrigerant enter the
accumulator after leaving the evaporator coil. The
accumulator prevents any liquid refrigerant from reaching
Figure 2: Refrigeration system
