Owner`s manual

SECTION 15. ALARM TROUBLESHOOTING
pH OUT OF RANGE
pH is measured on a scale ranging from 0 to 14, with pH 7.0 considered neutral. pH
below 7.0 is considered acidic and above 7.0 is alkaline. pH is a significant variable
in determining water quality as it affects sanitizer activity, color, and human
compatibility with the water. The proper pH range for swimming pools and spas is
between 7.2 and 7.8.
pH LOW
A pH below 7.2 will cause corrosive water resulting in possible damage to the
filtration components and pool surface as well as bather discomfort. First, test the
pool/spa water with a phenol red pH test kit. If the pH on the test kit agrees with the
controller and the pH is below 7.2, check the pH correction chemical level. If the
manual test does not agree with the controller clean the sensor.
pH HIGH
A pH above 7.8 will cause scaling on the pool surface, plumbing, and filtration
equipment as well as cloudy water, inefficient use of sanitizer and bather discomfort.
First, test the pool/spa water with a phenol red pH test kit. If the pH on the test kit
agrees with the controller and the pH is above 7.8, check the pH correction chemical
level. If the manual test does not agree with the controller clean the sensor.
pH OVERFEED
The pH Overfeed timeout occurs when the CAT 4000 has been feeding chemical for
a time greater than the selected maximum feed time and has not reached its setpoint.
A properly selected Overfeed timeout prevents the unit from continuing to feed
chemicals when the chemical supply has been diminished or a chemical feeder has
become clogged or broken. First, check the chemical supply and chemical feeder.
If both are in order, check the Overfeed timeout setting as it may need to be increased
to keep up with chemical demand.
pH TANK LOW
The pH Tank Low alarm will sound when the chemical being fed falls below the
optional optical level sensor in the tank. First check the chemical level. If the level
is above the sensor, check the sensor for obstruction or scaling.
ORP OUT OF RANGE
Oxidation Reduction Potential is a measure of the oxidizing capacity present in
water. Unlike a DPD chlorine reading, which can only differentiate between free
available chlorine and the less effective combined chlorine, ORP provides an
accurate measure of water quality regardless of pH, TDS, cyanuric acid, or non-
chlorine oxidizers. The proper ORP range for swimming pools and spas is between
650 and 800 mV, with any value above 650 resulting in healthy water quality.