Hayward CAT 3500 CAT 3500 Owners Manual - Page 13

Press MENU to return to the Operating Menu. The controller will automatically return to normal operating mode in 10 seconds. NOTE: In certain unusual applications, pH correction may be required in both acid feed and base feed modes. The third relay can be programmed as described later in this manual to accommodate this requirement. pH Priority: The CAT 3500 features a pH Priority setting which will inhibit ORP feed whenever pH is greater than .2 pH from the setpoint. This feature provides an important safeguard when sanitizers with a high pH (such as liquid chlorine) are used. From the Configuration Setup Menu: Press DOWN to find the pH Priority menu item. Press ENTER to select pH Priority. The current pH Priority Mode will be displayed: pH Priority Off Press UP or DOWN to enable or disable pH Priority. Press ENTER to save your selection. Press MENU to return to the Operating Menu. The controller will automatically return to normal operating mode in 10 seconds. PH Interlock: When this option is enabled or "On", ORP Feed is disabled if pH is in a high alarm condition. From the Configuration Set Up Menu: Press DOWN to find the PH Interlock Menu item. Press ENTER to select PH Interlock. The current PH Interlock setting will be displayed: pH Interlock On Press UP or Down to scroll to desired setting. Press ENTER to save your selection. pH Feed: The CAT 3500 by default uses a time-based proportional feed algorithm which enables the control of virtually any body of water without under-feeding or overshooting the setpoint. With some types of chemical feeders, however, it is beneficial to disable proportional feed and feed on a fixed basis. From the Configuration Setup Menu: Press DOWN to find the pH Feed menu item. Press ENTER to select pH Feed. The current pH Feed setting will be displayed: 12 USE ONLY HAYWARD GENUINE REPLACEMENT PARTS