Troubleshooting - Netafim SANDSTORM Installation 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 (see TIP,
page 3).
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 assembly. 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 outlet manifold during filtration:
1. Depressurize the system.
2. Disconnect the outlet manifold and visually identify which filter tank is losing gravel.
Alternatively, you can open the filling ports of the tanks, one by one, and visually identify the tank in
which the media level has dropped.
ATTENTION
There may be more than one tank losing gravel.
3. Empty the media from the tank/s and replace the damaged under-drain diffuser/s ("flutes") inside the
tank/s.
4. Refill the tank with media (see instructions in the Installation chapter, steps 23-25, page 17).
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.
20 | SANDSTORM SINGLE/DOUBLE CHAMBER INSTALLATION MANUAL
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