Therma-Stor Products Group TS-261B Maintenance, Hour Meter, Air Filters, Checking Airflow

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 3.1A). 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 15-3/4” x 15-3/4” x 1” 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 52.1-1992), MERV-7, pleated fabric filter. Actual size is 15-3/4” x 15-3/4” x 1-3/4”. 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

13-7/8” 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.

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.

Figure 7: Checking airflow

To check airflow:

3.1A Activated Carbon/Potassium Permanganate Filters	· Remove any inlet ducting, but leave the top and all
		filters in place.
Optional gas phase filters are available from Therma-
	· Turn the unit on high. The airflow meter will indicate an
Stor. They use a blend of activated carbon and potassium
permanganate. This blend removes the vast majority of		air speed. Please set the air meter to read FPM (refer to
contaminants encountered in most filtering applications.		the meter instructions to set the mode). To determine
The activated carbon removes the heavier volatile organics		CFM see the chart below:
while the potassium permanganate removes lower
						Kestrel 3000 FPM
molecular weight contaminants. This is well suited to the
smoke odors present after fire damage.		700	650	600	550	500	450	400	350	300	250	200	150
The life of the media blend depends upon both the hours	400		371	343	320	286	263	235	208	182	153	120	87
used and the contamination level. Another advantage							CFM
of the blended media versus activated carbon only is
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