American Standard ACONT900AC43UA Owner's Manual page 45

Step 18. User Setup Number 0640: Clock Format
To change Options, press the Up or Down arrow key to the right of the number in the lower right
corner of the screen. Options:
12 - 12 hour clock.
24 - 24 hour clock.
To advance to the next Setup Number, press the Up arrow key to the right of 0640. To go back to the
previous Setup Number, press the Down arrow key.
Step 19. User Setup Number 0670: Screen Lockout Function
To change Options, press the Up or Down arrow key to the right of the number in the lower right
corner of the screen. Options:
0 - All keys are available. Screen is unlocked.|
1 - Screen is partially locked. All key functions are locked except the Temperature Up and Down
keys and the Cancel key. Enter Advanced Setup to unlock the screen.
2 - Screen is fully locked. Enter Advanced Settings to unlock the screen.
To advance to the next Setup Number, press the Up arrow key to the right of 0670. To go back to the
previous Setup Number, press the Down arrow key.
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