Hayward CAT 3500 CAT 3500 Owners Manual - Page 11

pH Feed Mode Automatic Feed Press UP or DOWN to find the desired selection. Press ENTER to save your selection. The controller will automatically return to normal operating mode in 10 seconds. The "Off" (disabled) mode is useful when servicing pH feed equipment, or if pH chemical supply has been depleted. The "Manual On" mode allows constant chemical feed for a fixed interval of up to 25 minutes. This feature is useful when the addition of extra chemicals is desired, as well as during initial balancing of the water. NOTE: Always disconnect chemical feeder power cords prior to performing any electrical service. To Change The ORP Setpoint: The CAT 3500 is programmed at the factory to maintain ORP at 650 mV by default. This is the generally accepted world standard for safe drinking water. In order to maintain a given chlorine or bromine residual in conformance with Health Department standards for a particular body of water, perform the following: Check and balance pH, calcium hardness and total alkalinity. Manually feed chlorine or bromine to desired ppm residual. Note the displayed ORP value. This will be used as the setpoint. While in normal operating mode: Press MENU. Press DOWN to find the ORP Setpoint menu item. Press ENTER to select ORP Setpoint. The current ORP setpoint will be displayed: ORP Setpoint 650 mV Press UP or DOWN to select the setpoint noted above. Press ENTER to save your selection. The controller will automatically return to normal operating mode in 10 seconds. To Select ORP Feed Mode: The CAT 3500 is programmed at the factory to operate in automatic feed mode as the default setting. Other ORP feed mode selections include off (disabled), and manual on for a fixed interval up to 25 minutes after which automatic feed will resume. While in normal operating mode: Press MENU. Press DOWN to find the ORP Feed Mode menu item. Press ENTER to select ORP Feed Mode. The current ORP Feed Mode will be displayed: 10 USE ONLY HAYWARD GENUINE REPLACEMENT PARTS