Specifications
23G-Series RO System
3024270 Rev G 89 14Oct13
Troubleshooting Guide - Machine Performance
Symptom
Possible Causes
Remedies
pressure drop [over 15
psi (1.0 bar)] per
membrane (Note:
membrane pressure
drop equals primary
pressure - final
pressure)
membranes.
Restricted flow at housing inlet or
outlet.
Check for blockage of concentrate flow at inlets
and outlets of element housings.
Telescoped membrane covering
membrane housing outlet port.
Ensure that the anti-telescoping device (ATD)
is located properly on the membrane.
Concentrate or recycle flow rate
too high.
Adjust orifice.
Primary or final pressure
transducer out of calibration.
Calibrate or replace. Check transducer for
fouling.
Pressure does not
drop when concentrate
valve is opened
Dirty concentrate valve.
Disassemble and clean the valve.
Low permeate flow
rate (0 gpm to 20%
less than desired)
Dirty or fouled membrane.
Flush, clean, and sanitize the membranes.
Operating on cold water less than
55°F (13°C).
Install a hot/cold feedwater tempering valve if
more permeate flow is needed. Operate with a
feedwater temperature of 72-77F (22-25C).
Low operating pressure.
See possible causes for low operating
pressure.
Concentrate flow too high.
Manual concentrate valve not closed. Autoflush
is on or stuck. Verify proper Autoflush valve
operation and correct if needed.
Permeate pressure alarm
activating due to back pressure
on permeate line resulting in
instant machine shutdown.
Check the permeate plumbing for restrictions;
measure the flow from individual permeate
tubes. Verify that the distribution loop is not
deadheaded beyond the permeate pressure
alarm set point.
Membrane elements installed with
concentrate seal reversed or
damaged.
Refer to Membrane Element Installation
(Section 5.14.2) for proper membrane and
concentrate seal installation. Replace damaged
concentrate seals. After correcting membrane
element and concentrate seal installation, clean
and sanitize membrane elements.
Faulty flow turbine or cable (all
pressures normal).
Switch sensor cables between concentrate and
permeate flow turbines to isolate the problem to
cable or turbine.
Cable or turbine element
damaged.
Repair or replace the cable or turbine.