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7. Troubleshooting
Problem
Pump inlet pressure
switch fails to close
after start-up (PRS1)
Reduced RO fl ow
rate (PRS2)
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Troubleshooting
Troubleshooting
Section Header
Potential Causes
•
Municipal Water Supply is turned OFF
to unit
•
Air supply is OFF or is adjusted to less
than 80 psi needed to open ASCO
8290 air operated valves. A leak
in the air line to the valve can also
create this fault
•
Carbon Block has high pressure drop
due to debris or clogged blocks
•
A failed switch (or corrosion in
the connector) can cause a high
resistance and cause the system to
fault
Restriction in the RO fl ow loop (lines,
•
membranes, recirculation loop,
reject orifi ce, etc) which increase the
RO pump pressure rapidly during
operation. A spike in pressure above
the setpoint will result in a shutdown.
•
Damaged membranes which are
fouled are restricting the RO fl ow,
commanding higher pressure.
•
Water temperatures lower than
40F will create a reduced RO fl ow
rate. The membrane fl ow will drop
approximately 2% for each degree F
the water temperature drops below
77F. As the water reaches 40F, the
pump pressure required to generate
fl ow reaches a maximum pressure
Solution
•
Verify municipal water is turned ON
•
Verify that the air supply is 80PSI
•
Verify Valve A is actuating (red indicating nipple
visible on head of valve)
•
Verify sensor cable is installed correctly
•
Verify there is nothing clogged in the system
Replace membrane if fl ow is 20% lower than the
•
target for the tank level at which you are operating
•
If the feed water is consistently at or below 40F,
consider installing an in-line water heater or a hot
water mixing water.
•
If the water feed temperature is always low (40-50F),
consult with innovateIT for a recommendation on a
cold-water membrane (DuPont XLE-440i membrane
would improve cold weather performance)
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