A.O. Smith 3400 - Manual (Page 54)

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Press the Yes button to confirm each safety parameter block. If
the No button is selected, the safety parameter block remains
unconfirmed and the Configuration menu page is displayed. The
control remains in an unconfigured state in this case.
After all safety parameter blocks have been confirmed, the
installer is asked to press and hold the Reset button on the
Burner Control to complete the safety verification session (see
Figure 60).
When the Reset button is pressed and held for 3 seconds the
confirmed safety parameters are saved in the control. The
above Reset dialog box automatically closes when this step is
completed.
If this step is not performed, the control remains in a safety lockout
state until the installer resolves the unverified safety parameters.
FAULT/ALARM HANDLING
Each Burner Control reports to the OI display when a safety
lockout or an Alert occurs.
Safety lockouts are indicated on each configuration page as an
alarm bell symbol. At the status page (for S7999D), the History
button turns red. If the S7999D is displaying the system status
icons, the control in alarm will turn red.
The lockout history can be displayed by pressing on the History
button. The state information about each lockout is displayed
along with the date/time that the lockout occurred (refer to Table
19). Current date/time stamp is a display setup feature.
NOTE: In the event of a power interruption, the date/time must
be reset. The OI Display does NOT have a backup means.
All safety configuration parameters in the group should have the
same access level. If this condition isn’t so, the user is asked to
enter another password when a higher access level is needed.
Successful login is noted by the lock icon, which changes
to “unlocked” on the page. The installer may begin to change
safety parameters (or any other parameters) at that time (see
Figure 58). If the Burner Control is in an unconfigured (or new)
state, then this warning doesn’t appear. All parameters that need
changes should be changed during the login.
If the safety configuration session is terminated after it has
started (in the Edit or Verify stages), the Burner Control is left in
an unconfigured (unrunnable) state.
The installer can terminate the session by pressing the Menu
button or by attempting to leave the Verification page with
the Home or Back buttons (top-left and -right screen corners,
respectively). However, leaving the session at this point leaves
the control in an unrunnable state and confirms whether the
installer still wants to do so.
The settings of all parameters in each safety block must be
verified to save them in the control.
When the installer is done changing safety parameters,
pressing the Verify button on the configuration screen begins
the Verification process. The settings for all safety parameters
in each changed block are presented and Verified by the installer
(see Figure 59).
FIGURE 58. EDIT SAFETY DATA
FIGURE 59. SAFETY PARAMETER CONFIRMATION
FIGURE 60. SAFETY PARAMETER RESET