therma-stor-products-grou ts-261b Manuale Utente

5

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.

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.

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

700  650  600  550  500  450  400  350  300  250  200  150
400  371  343  320  286  263  235  208  182  153  120  87