11
EN
Laying of hoses:
The connecting hose of FT 500 or rather of the entire unit itself has to be laid as
close as possible to the source of the air contamination. With increasing distance of the suction hose
from the origin of the air contamination, the share of air contamination decreases disproportionately.
For improved acquisition at the point of origin HEYLO provides a base stand to hose connection
socket on the suction side. In order to place the hose ends at a higher position, the hoses can be
attached to telescope rods using lashing straps.
Ensure move of the suction hoses in the work area as close to time as possible. Hoses should be laid
without kinks, if possible, and in a straight line to the air filter. If and when necessary, auxiliary
constructions have to be set up for overcoming differences in height, for example (by chamfering of
supporting wood nailers, for example). In the area of the suction hoses, the constriction of the cross-
section by kinks increases the suction air flow. In the exhaust air hose, the exhaust air flow counter the
cross-sectional constriction by kinks.
The suction hose has to be arranged in such a way that contaminated air is removed from the
breathing area of the employees, and fresh air and/or purified air is supplied to the employees.
The purified exhaust air of the air filter has to be passed to well ventilated areas and/or to the outside.
A return of purified air into the working area is permitted only, if sufficient base ventilations with fresh
air is ensured at the same time. A second air filter may be set up for air ventilation, if and when
necessary. Please observe the national health and safety regulations.
Required air exchange:
The required air exchange depends on the type and volume of air pollutants.
Correspondingly, air exchange rates of between triple and 20-fold of the room volume may be
required.
The professional associations recommend a 15-fold air exchange. In case of quartziferous A dusts,
the occupational exposure limit value is 1.5 mg/cum, and in case of E dusts 10 mg/cum (TRGS 900).
Example:
A 15-fold air exchange is required for a room volume of 50 cum.
The required air volume is 15 x 20 cum, thus at least 750 cum/h. Dust Stop PLUS
performs at least approx. 840 cum/h.
A sufficient air exchange is thus ensured.
The precise requirements are listed in the installation guidelines mentioned in chapter (6).
(5) Filter / change of filter
Filter system:
The air cleaner system Dust Stop PLUS uses a two-stage filter system. The first filter
stage consists of a pre-filter and the main filter stage consisting of a robust HEYLO filter of the dust
classes M.
Change of filter:
Independent of the change of filter indicator, both filters have to be replaced after
every use involving contaminants. If the composition of the particles drawn in is not known, the filter
should be replaced completely after use on the respective building site. Both filters have to be
replaced so that the soiling (contamination) is not passed into clean areas.
Service life of filter:
The service life of the filter depends on the quantity of dust drawn in. Very fine
dust may drastically reduce the service life. Saturated pre-filters have to be replaced; saturated main
filters can be cleaned up to a maximum of five times.
Change of filter indicator:
When the analogue filter indicator leaves the green area (pointer is in red
area), the pre-filter or, when necessary, the main filter have to be exchanged. Please remember to
have sufficient filter material available in order to prevent interruption of the work.
