SCREENGUARD AUTOMATIC SCREEN FILTERS OPERATION, INSTALLATION AND MAINTENANCE GUIDE • 17
TROUBLESHOOTING
SYMPTOMCHECK SOLUTIONS
Filter flushing cycle
does not stop
PROBLEM
Check condition of battery and
solenoid by connecting the
solenoid wires directly to the
battery.
If the distributor unit aperture clogged, clean it.
If the distributor unit aperture is not clogged
and the flushing valves do not flush, disconnect
the control tube from the actuator’s lower
section and verify water pressure.
Flushing does not
stop
If there is no water pressure - check the
control tube for obstructions
If there is water pressure - replace the
mechanical actuator
SYMPTOMCHECK
SOLUTIONS
Flushing cycle
doesn’t start
Pressure difference
between inlet and
outlet - above 7 psi
PROBLEM
Flushing cycle
starts
Check the differential pressure
indicator adjustment.
Verify that the line pressure
matches the filter’s operational
pressure.
Perform an additional flushing
cycle manually by pushing the test
button located on the outside of
the control box. (See Figure 3).
Disconnect the control tube from the flushing
valve's lower section. Perform a flushing cycle
manually, by operating the handle located on
the solenoid.
Check the hydraulic flushing valve for
obstruction and replace if required.
If Control Water is present, the solenoid is faulty
and should be replaced. If no Control Water is
present, check the distributor unit or the control
tube for obstructions.
Water doesn’t
come out of the
control tube
Water comes out of
the control tube
Check the hydraulic flushing valve for
obstruction and replace if required.
Check battery condition. Replace bad batteries.
If battery is okay, check the electrical
connections on the control card and the
solenoid electrical connection at the
differential pressure indicator.
If connections are not okay, connect properly.
If connections are okay, short the differential
pressure indicator wires on the control card.
If the flushing cycle starts, replace the
differential pressure indicator.
If the flushing cycle doesn’t start - See A.
Check solenoid operation by
connecting the wires
directly to the battery.
Solenoid clicks and
flushing cycle
starts
Solenoid clicks and
flushing cycle does
not start
Solenoid doesn't
click at all (not
operating)
Replace the control card.
Check inlet and outlet line pressures.
Pressure reading above 15 psi - faulty solenoid.
Pressure reading below 15 psi - the filter does
not comply with the system operating
requirements.
Close the outlet valve and check that
differential pressure between inlet and outlet of
the filter is zero.
Perform a flushing cycle manually by operating
the handle (turn clockwise 90
o
) located on the
solenoid and open the outlet valve.
Differential pressure nullified - the filter was
badly clogged.
Differential pressure remains the same - See B.
Replace the solenoid.
A
B
Disassemble the filter and check:
1. Dirt collector rotates freely
2. Upper bearing and screen
bearing are not deformed
(oval in shape)
Replace the defective part and/or release the
jammed part.
Reassemble the filter and operate the system.
Filter found serviceable - the problem was not
solved during a regular service check, call
technician.
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