Filtration Position; Backwash Position; Rinse Position; Closed Position - Astralpool VRAC III Basic Series Installation And Maintenance Manual

ENGLISH

1.2.1 Filtration position:

The pump sucks water from the swimming pool via the skimmer, bottom cleaner or drain, it is taken to
the multiport valve (PUMP connection) and from here to the filter (TOP). It passes through the filter bed
and returns to the valve once again via the BOTTOM connection and is taken back to the swimming pool
by means of the RETURN connection.
The valve includes a pressure switch that determines the saturation pressure of the filter and therefore
when it is necessary to carry out a washing and rinsing process of the filter. The range of the pressure switch
is from 30 to 200 kPa (0,3 - 2 bar / 4.2 – 28.4 psi), which is factory set to an operating pressure of 200 kPa
(2 bar) (29 psi). A new specific regulation of the pressure switch should be carried out for each installation
so that the operating system to wash the filter is correct. (see paragraph 2.5).
If the pressure exceeds the pre-established limit, the valve will automatically change position to start a
washing and rinsing cycle. This cycle can also be automatically time controlled, after 24 hours or 7 days
from when the last wash was carried out, as long as the valve is connected to the electricity.
Valve in filtration
process

1.2.2 Backwash position

The valve automatically reverses the filtration cycle and commences the filtering process. This function
requires that the valve is set so that the water coming from the PUMP connection passes through the
valve and is taken to the filter by the BOTTOM connection, the sand is stirred and the water, together with
any accumulated dirt exits the valve TOP connection which communicates with the WASTE connection
(emptying) and is taken to the drain. This process is carried out in accordance with the pre-established
timing on the keyboard.
Valve in
washing
position

1.2.3 Rinse position

The valve is positioned to compress the filter bed and not to send water containing sand to the swimming
pool. This function is achieved by water coming from the PUMP connection entering the filter by the TOP
connection, it then compresses the sand and the water enters the valve via the BOTTOM connection which
then sends it to the WASTE connection. This process is carried out in function of the pre-established time
and once it has elapsed, the valve commences the filtration process again.
Valve in rinsing
position

1.2.4 Closed position

The valve is positioned in such a way that the flow that comes in through the PUMP opening, from the
pump, is isolated from the other openings.
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