Recirculator II User and Service Manual
7
To change a filter:
1.
If the unit has recently been in use during a respiratory treatment of a tuberculosis
patient, treat it accordingly. It may be necessary to wait a short period of time before
handling the filters. Consult your Infection Control or Safety Officer.
2.
Wear NIOSH-approved personal respiratory protection rated for 99.97% efficiency at
0.3 microns whenever you open the top of the Recirculator II.
3.
Open the Recirculator II only in an area with a negative pressure relationship to
adjacent areas, so that contamination of such adjacent areas cannot occur as a result
of these procedures.
HEPA Filter Replacement
To replace the HEPA filters:
1.
Disconnect the power to the Recirculator II.
2.
Open the unit and release the set screws securing the filters in place.
3.
Remove the old filter:
a.
Turn a waste bag inside out and lay it on top of the filter to be replaced.
b.
Grasp the top of the filter with the bottom of the bag.
c.
Slowly withdraw the filter while rolling the inverted bag down over the filter.
d.
Seal the bag and dispose of it properly.
4.
Install a new HEPA filter (Part No. 9402):
a.
Insert the new filter and secure it in place with the set screws provided, with
its rubber gasket firmly seated against the inside of the grillwork face.
b.
Adjust the pressure exerted on the filters by the set screws by turning them in
a clockwise fashion.
The set screws should be adjusted so they all exert the same pressure on the
filter frame and compress the rubber gasket to the extent of 30%-50% of its
thickness. This will ensure that there is no leakage around the filter frame.
WARNING: Care should be taken in changing the HEPA filters, because
improper handling (damage to the filter fabric) or improper installation
could result in infectious particles circumventing filtration and escaping
into the atmosphere.
