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3.0 Filter Start-Up
Once the filter has been properly installed and after reviewing the filter’s control system, the
filter may be started by following the procedure below.
1. With the inlet, discharge and backwash valves closed, start any pumps serving the
filter. Slowly open the inlet valve. Check and correct for any possible leaks. Bleed
air from the filter body using the bleed cock on the underside of the filter.
2. Ensure that power is to the filter in accordance with the Installation Guide (the Amber
LED should be illuminated). Ensure air to the backwash valve is at least 80 psi.
3. The discharge valve may now be slowly opened and the regulating valve adjusted to
give the desired flow rate and pressure combination.
4. A final, on-line backwash check should be performed. Manually initiate a backwash
by depressing the manual backwash button on the control cover, check that the
backwash counter advances, backwash LED illuminates Blue and the pneumatic
backwash valve is operating correctly, refer to Section 1.5.
3.1 Backwash Cycle
Upon a signal from either the DP switch, manual backwash button or interval timer, the filter
will begin a backwash cycle. This cycle is as follows:
1. The blue backwash lamp will illuminate and the motor/gearbox will drive the Indexing
Valve Shoe to the first pod.
2. When the indexing valve has reached the first pod, the motor/gearbox will stop and
the pneumatic air solenoid valve on the backwash valve actuator will be energized.
This will open the backwash valve for the allotted time on the duration timer.
3. When the backwash valve is opened it causes a reverse flow of fluid through the pod
the Indexing Valve Shoe is positioned. This reverse flow of fluid passes through the
dirty element and causes the element to open and shimmer while backwashing the
debris trapped on the element. This debris is sent to drain via the backwash valve
and pipework.
4. Once the backwash duration time has elapsed, the backwash valve is then closed.
Once the valve is closed, the motor/gearbox will drive the Indexing Valve Shoe to the
next pod and the above procedure is then repeated for the remaining dirty pods.
5. After the last pod has been cleaned, the indexing valve is rotated to the park position
(filter position) and the blue backwash lamp is extinguished and the backwash
counter is advanced.
