Hayward CAT 3500 CAT 3500 Owners Manual - Page 28

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. ORP Overfeed The ORP Overfeed timeout occurs when the CAT 3500 has been feeding chemicals for a time greater than the selected maximum feed time and has not reached its set point. 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 timer setting as it may need to be increased to keep up with chemical demand. ORP Tank Low The ORP Tank Low alarm will sound when the chemical being fed falls below the chemical level in the tank. First check the chemical level. If the level is above the sensor, check the sensor for obstruction or calcification. No Flow The CAT 3500 is equipped with a flow sensor to prevent the controller from feeding chemicals in the absence of proper recirculation. First check the filtration system to ensure that it is running and that water is moving through the flow cell. If water is flowing and the alarm is still sounding check flow sensor for obstruction. When using the optional Digital Flow Sensor, the digital flow alarm setting can be entered in gallons-per-minute to send a No Flow alarm when the filters require cleaning or backwashing. Technical Specifications Enclosure Type 7" x 7" x 2.3" Glass Filled Polycarbonate Enclosure Properties NEMA Type 1, 4, 4X, 6, 12, 13 Flame Resistance UL94-5V (UL 746 C 5) Display 2 x 20 Character Vacuum Fluorescent Front Panel UV Protected Lexan Membrane Switch Key Type Embossed with Stainless Tactile Domes 27 USE ONLY HAYWARD GENUINE REPLACEMENT PARTS