Control Overview - A.O. Smith BTH 120 Series Service Handbook

CONTROL OVERVIEW

Interaction with the water heater controller is through an LCD display called the User Interface Module
(UIM). This screen is also referred to as the "desktop" or "desktop menu". Up and down buttons and
three operation buttons allow navigation through the control menus and to make adjustments to the water
heater. Operation of the three lower buttons is defined immediately above them on the screen.
While the water heater is operating, the user interface will display the desktop screen (if there are no active
faults or warnings).
An example of this screen is shown below.
•
The first temperature on this screen is the temperature of the water inside the tank.
•
The second temperature on this screen is the Operating Set Point. The Operating Set Point is the
temperature at which the water heater will maintain the water inside the tank.
•
The third line on the screen is a text description of the Operational State of the water heater. The
operational state of the water heater is also indicated graphically by status icons.
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Servicing should only be performed by a Qualified Service Technician