Hayward CAT 3500 CAT 3500 Owners Manual - Page 10

Press MENU. The following will be displayed: Operating Menu pH Setpoint To Change The pH Setpoint: The CAT 3500 is programmed at the factory with a default setpoint of pH 7.5. CAT Controllers considers this to be ideal for pool and spa applications. The following steps enable the selection of a different setpoint. While in normal operating mode: Press MENU. Select pH setpoint by pressing ENTER. The current pH setpoint will be displayed: pH Setpoint 7.5 pH Press UP or DOWN to select the desired pH. Press ENTER to save your selection. The controller will automatically return to normal operating mode in 10 seconds. To Calibrate pH: The CAT 3500 is far more accurate than most liquid test standards, but pH calibration is necessary to match manual water testing results, compensate for a depleted or unclean pH sensor, and confirm proper operation of the system. While in normal operating mode: Press MENU. Press DOWN to find the pH Calibrate menu item. Press ENTER to select pH Calibrate. The sensed pH value as currently calibrated will be displayed: pH Calibrate 7.5 pH Press UP or DOWN to match your known good standard. Press ENTER to save your selection. The controller will automatically return to normal operating mode in 10 seconds. To Select pH Feed Mode: The CAT 3500 is programmed at the factory to operate in automatic feed mode as the default setting. Other pH 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 pH Feed Mode menu item. Press ENTER to select pH Feed Mode. The current pH Feed Mode will be displayed: 9 USE ONLY HAYWARD GENUINE REPLACEMENT PARTS