Lochinvar 100 Series Instruction Manual page 26

Control System Operation
Press the Up and Down buttons to adjust the Operating Set Point to
the desired setting.
Press the Operational Button underneath "UPDATE" to confirm the new
setting. Press the Operational Button underneath "CANCEL" to discard
the new setting and retain the previous setting.
The new Operating Set Point value should now be displayed as the
current value.
NOTE: Use this same procedure to adjust the Differential settings and
the Tank Probe Offset in the Temperatures Menu.
This same procedure is used to change user settings in other control
system menus.
26 • Commercial Electric Water Heaters
Adjusting the Operating Set Point and the Differential Settings
ACTION DISPLAY