USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
9
To Enter The Operating Menu:
The operating menu contains selections which are likely to be changed on a routine basis, and
therefore are easily accessed. While in normal operating mode:
Press MENU.
The following will be displayed:
To Change The pH Setpoint:
The CAT 4000 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:
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 4000 is far more accurate than most liquid test standards, but pH calibration is neces-
sary 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:
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.
pH Calibrate
7.5 pH
Operating Menu
pH Setpoint
pH Setpoint
7.5 pH
