American Standard CH530 - Manual (Page 49)

49 CDHF-SVU01C-EN
Operator
Interface
The time setpoint screen with a 12-hour format is shown below: The user
must select Hour, or Minute and then use the up or down arrows to adjust.
Adjusting hours will also adjust am and pm.
Note: The 24-hour format setpoint screen is similar with the am and pm not
shown.