48" AGF 910101-001049 / 01.2020
Page 16 of 21
Troubleshooting
Symptom
Possible Causes
Solutions
Filter station differential
pressure increases rapidly
during operation,
especially at start-up
Excessive flow rate
During system start-up, throttle downstream flow to the
designed flow rate. Use a manual valve or pump control /
sustaining valve.
Unusual concentration of
contaminants
Check water source quality. Contact an authorized Amiad dealer
for assistance.
Failure to backwash
across all filters
Controller output problem
Check that the controller is on and programmed correctly.
Attempt to manually actuate the solenoid with the clock.
The solenoids should emit a clicking noise when actuated.
Clean the command filter.
Insufficient downstream
pressure for backwash
Use the manual knob on the base of the solenoid to
backwash one tank. Note the downstream pressure reading.
If the pressure falls below 20 psi, it may be necessary to
throttle the field valves to build up sufficient backwash
pressure.
Hydraulic command system
failure
Check to be sure the isolation valve is in the “on” position.
Remove one of the hydraulic tubes leading to the
solenoids and verify that pressurized water is available.
Inspect the hydraulic command filter for contamination.
Filter station differential
pressure remains high
after backwash
Gauge error
Check gauge differential on manifolds against the differential
gauge on the controller. If there is a discrepancy, check readings
with a new gauge.
Insufficient backwash
pressure
Verify that the downstream pressure during backwash is at
least 20 psi. If not, it may be necessary to throttle a valve
downstream of the filter station to sustain sufficient backwash
pressure.
Insufficient backwash flow
Check the backwash restriction valve setting. Adjust according
to the procedures outlined in the backwash restriction valve
adjustments section.
Excessive contamination of
media
Open the access cover and inspect the media bed after a
backwash. Verify that the sand level is correct and that there is
no excessive amount of debris in the sand.
Verify that the backwash manifold line meets the size
requirements outlined in the backwash manifold assembly section.
