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28
SYMPTOM
High operating pressure
Excessive pressure drop
[over 50 psig (3.4 barg)]
(high primary pressure - low
final pressure)
Water flowing when machine is
turned OFF
Declining rejection
(high permeate conductivity)
POSSIBLE CAUSES
Recycle or concentrate valve
plugged
Inaccurate pressure gauge
Restricted or reduced permeate
flow rate
Restricted flow after pump
outlet
Telescoped membrane element
covering membrane element
housing outlet port
Severely fouled or dirty
membrane elements
Inlet solenoid valve not closing
or seating properly
Dirty or fouled membrane ele-
ments
REMEDIES
Disassemble the plumbing to the
recycle valve and remove for-
eign particles. Check the con-
centrate valve stem.
Replace or calibrate the gauge as
required.
See possible causes for low per-
meate rate.
Check for blockage of the con-
centrate flow at the inlets and
outlets of membrane element
housings.
Ensure that the anti-telescoping
(ATD) is located properly on the
membrane element.
Flush the machine, then clean it
with detergent.
Clean or replace the valve.
Clean the membrane elements
with detergent immediately
.
Water must not pass through the
inlet when the machine is OFF.
Flush and clean the membrane
elements.
TROUBLESHOOTING GUIDE