Astralpool System VRAC III Basic Manual Instalación página 14

6. If the automatic 7 days backwash on the valve is switched on, the backwash and rinse
operation will be done at the speed fixed by the programmer at that moment. Therefore, we
recommend to cut the power supply or force a backwash operation in a high speed period of
time.
5. PRESSURE SWITCH SET UP.
1. Switch on the pump (remember: installations with DUAL SPEED pump, pressure
switch must be tuned at high Speed mode).
Notice the working pressure at standard conditions (clean filter). Pressure will be
different on every case. In this example, filter works at 0,8 kg/cm
2. From this value, we may calculate the pressure when a backwash is needed. People
use to add 0,5 kg/cm
3. Locate the pressure switch on one side of the valve´s body. It´s covered by a black
rubber cap.
15/12/2010
Fig. 18.- Working pressure: 0,8 kg/cm
2
over the working pressure. In this example:
0,8 + 0,5 = 1,3 kg/cm
Fig. 19.- Pressure before backwash: 1,3 kg/cm
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Installation Manual
BASIC Automatic
Multiport Valve
2
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2
2
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2
Rev 3.0