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CAUTION: Do not remove the top to access the filters with
the unit on. Removing the top and filters while running can:
(A) expose potentially fatal high voltage electrical parts, and
(B) expose the dangerous rotating impeller fan.
2.8 Hour Meter
A digital hour meter is located near the power/speed
control on the unit front. It measures the cumulative time
that the unit is turned on to tenths of an hour. It stores its
total when the unit is unplugged. The previous total will be
displayed when the unit is next turned on.
It resets to zero after 99,999.9 hours of operation.
3 Maintenance
3.1 Air Filters
The standard Phoenix Mini-Guardian HEPA System is
equipped with three filters that progressively filter out
smaller particles. An optional activated carbon/potassium
permanganate filter can be used, giving a fourth stage
of filter media (see Section 3.A). These filters must be
checked regularly. Operating the unit with dirty filters will
reduce the airflow, but will do no harm to the unit. The unit
can be run indefinitely with dirty filters.
The three standard filters used are listed below (as
installed in the unit from top to bottom):
A. Polyester media pad pre-filter. Actual size 5-3/4” x
5-3/4” x ” thick. The white side faces up. This filter
should be replaced when the airflow is reduced, it is
visibly dirty or when it is contaminated by a previous
job.
B. 25 to 30% efficient (per ASHRAE 52.-992), MERV-7,
pleated fabric filter. Actual size is 5-3/4” x 5-3/4”
x -3/4”. This filter should be changed when airflow is
reduced or it is contaminated by a previous job.
C. 99.97% DOP efficient HEPA filter. Actual size is
3-7/8” OD x 24” x 8-7/8” ID. This filter should be
changed when airflow is reduced or it is contaminated
by a previous job.
3.1A Activated Carbon/Potassium Permanganate Filters
Optional gas phase filters are available from Therma-
Stor. They use a blend of activated carbon and potassium
permanganate. This blend removes the vast majority of
contaminants encountered in most filtering applications.
The activated carbon removes the heavier volatile organics
while the potassium permanganate removes lower
molecular weight contaminants. This is well suited to the
smoke odors present after fire damage.
The life of the media blend depends upon both the hours
used and the contamination level. Another advantage
of the blended media versus activated carbon only is
that part of the blend changes color as it loads up with
contaminants. It starts out black, then turns pink, then
brown, and finally white. It is best changed when it passes
the brown stage and begins to turn white. It has lost most
of its effectiveness at that point. When these filters are
installed, the pad filter does not need to be installed above
them. This allows the operator to check the media color
through the top grill of the unit without removing the top.
The filter is the same size as the pleated fabric filter.
Install it above the pleated fabric filter. The pleated fabric
filter catches carbon dust that comes off the carbon filter
before it reaches the HEPA filter.
The refillable carbon filter is metal-framed and can be
refilled with carbon blend media purchased in 5-gallon
buckets. The amount of carbon blend media loaded into
the filter can be adjusted to the particular amount of gas/
odor removal required.
3.2 Checking Airflow
The airflow is checked using a Phoenix Kestrel 3000
airflow meter placed on the designated area on the top of
the unit.
To check airflow:
· Remove any inlet ducting, but leave the top and all
filters in place.
· Turn the unit on high. The airflow meter will indicate an
air speed. Please set the air meter to read FPM (refer to
the meter instructions to set the mode). To determine
CFM see the chart below:
Figure 7: Checking airflow
Kestrel 3000 FPM
700 650 600 550 500 450 400 350 300 250 200 150
400 371 343 320 286 263 235 208 182 153 120 87
CFM
