Parker AQUA DUO A455C-2800, Technical Manual

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1. A mechanical failure exists in the RO Membrane Element and/or High-Pressure Vessel.
2. Cracked or broken RO Membrane Element product water tube which is caused by a
blockage in the Product Water Line during operation
3. Cracked End Plug in the High-Pressure Vessel allowing seawater to mix with Product
Water which is caused by over tightening of tapered pipe fittings into the End Plug
4. Damaged or worn Product Water O-ring in the High-Pressure Vessel End Plug
5. Lamination failure within the RO Membrane Element which is caused by a blockage in
the Product Water Line and/or air entrapment in the High-Pressure Vessel is normally
associated with mounting the High-Pressure Vessels vertically rather than horizontally.
ERROR ID 1 : System produces expected rated product water flow with normal operating
pressure after compensating for Feed Water Salinity and Temperature and the Product Water
salinity is above 1000 ppm for more than 10 consecutive seconds.
1. It is helpful to use a portable TDS meter to determine if the problem is with the RO
Membrane Element or with the Salinity Probe and Electronic monitoring system.
2. Damaged or worn Product Water O-ring at one of the End Plugs within the High-
Pressure Vessel is allowing Feed Water to mix with Product Water. This would usually
result in higher than normal Product Water Flow. However, a small nick in the O-ring
may allow enough Feed Water to mix with the Product Water to cause the condition
without resulting in a noticeable increase in Product Water Flow.
3. Crack in one of the End Plugs within the High-Pressure Vessel is allowing Feed Water to
mix with Product Water. This would usually also result in higher than normal Product
Water Flow. However, a small crack may allow enough Feed Water to mix with the
Product Water to cause the condition without resulting in a noticeable increase in
Product Water Flow.
4. RO Membrane Element is fouled due to normal use and requires cleaning.
5. Salinity Probe has debris on the probe causing the system to read poor water quality.
Clean the Salinity Probe with a toothbrush.
6. Salinity Monitor out of calibration. Test the actual Salinity of the product water using a
portable TDS meter. The system switches from potable water to un-potable water at 800
PPM TDS. If the salinity of the Product Water is less than 800 PPM TDS, then calibrate
the Salinity Monitor.
“ The Water Quality is less than 1000ppm, but the water has a definite salt taste. ”
1. Blockage or pressure in excess of 55 psi is present in the brine discharge line.
•
A blocked brine discharge line causes brine water to mix with product at the
Diversion Valve. Flow through the flow meter will be normal because the flow meter
is prior to the 3-way product water diversion valve.
•
Ensure that the brine discharge line is free from kinks and that any valves installed in
the brine discharge line are fully open.
2. Salinity Probe has debris on the probe causing the system to read good water quality. Clean
the Salinity Probe with a toothbrush.
Product Water is leaking from the Product Tubing when the Water Quality is less than 1000ppm.