Troubleshooting; If The Pressure Difference Across The Filtration System Is Over 0.7 Bar (10.15 Psi) And The Flushing Cycle Does Not Reduce It; If The Flushing Cycle Does Not Start But The Controller Is Initiating The Flushing Signal And The Solenoids Are Reacting ("Clicking") - Netafim SANDSTORM User Manual

TROUBLESHOOTING

WARNING
Do not perform maintenance operations or open filter ports before the pressure in the system is
fully released. For draining purposes, open any valve downstream from the filtration system until
the pressure is fully released. Check the pressure gauge to be sure it is at 0 before proceeding.
Alternatively, you can open the valve installed on the outlet manifold end-cap - if installed.
If the pressure difference across the filtration system is over 0.7 bar (10.15 PSI) and the
flushing cycle does not reduce it:
1. Check the system flow rate to see if the flow rate corresponds with the benchmark data, to make sure
that the system flow rate is not too high.
2. If the pressure differential is not caused by a high flow rate, perform the following steps.
3. Adjust the flow-control valve if necessary.
4. Make sure that the water from the backwash manifold is running free.
5. Check the duration of backwash and make sure the water that drains in the last 10 seconds of flushing
is clean.
If the water is dirty at the end of the flushing – increase the duration of flushing – if required, increase
the backwash duration and perform 3 consecutive flushing cycles.
If the flushing cycle does not start but the controller is initiating the flushing signal and
the solenoids are reacting ("clicking"):
1. Check the command filter in the control head. Clean it if necessary and perform manual flushing.
2. Check for clogging inside the solenoid valves - clean if possible or replace with a new solenoid.
3. Check for clogging of the hydraulic control tubes - open the clogs and clean if necessary.
4. Check for a ruptured or defective hydraulic control tube - replace if necessary.
If the media is running out through the backwash manifold during backwash:
1. Adjust the backwash flow-control valve on the backwash manifold.
• If a manual backwash flow-control valve is installed, throttle the valve to reduce the flow until the
media stops running out.
• If a hydraulic backwash flow-control valve is installed, the valve is factory pre-set to the required
flow rate.
In the rare case that the backwash flow-control valve requires fine-tuning:
a. Release the pilot lock-nut.
b. Gently rotate the pilot calibration bolt counterclockwise with a wrench to reduce the flow until the
media stops running out.
c. Retighten the pilot lock-nut.
2. Check the level of media inside the filters.
• If the level is lower than the media level marker on the filter tank - add media.
• If the level is higher than the media level marker on the filter tank - remove media.
SINGLE-/DOUBLE-CHAMBER USER MANUAL 17
SANDSTORM
™