Operating Set Point Adjustment - A.O. Smith BTX-100 Service Handbook

ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL

OPERATING SET POINT ADJUSTMENT

When the temperature sensed by the control system at the Temperature Probe (top of the
water heater) reaches the Operating Set Point the control system will end the heating cycle.
A call for heat will be activated again when the tank temperature drops below the Operating
Set Point minus the Differential setting plus one degree.
Example: Operating Set Point is 120°, Differential setting is 2° (factory default). A call for
heat will be activated when tank temperature drops to 117°. 120 - (2+1) = 117.
The Operating Set Point and the Differential setting is adjusted or changed in the
Temperatures menu. The following illustrations and instructions will explain how to adjust
these user settings and navigate the control system menus.
From the desktop screen, press MENU.
NOTE: Notice how the text on the UIM display above the
Operational Buttons changes as you navigate through
the various menus and screens.
With Temperatures selected (highlighted in black) in the
Main Menu, press the Operational Button underneath
"SELECT" to enter the Temperatures Menu.
If Temperatures is not selected use the Up and Down
buttons to select this menu item.
With the Operating Set Point selected in the
Temperatures Menu, press the Operational Button
underneath "CHANGE" to activate the adjustment mode
for this menu item.
NOTE: The Upper Probe Offset can be used to override
the control system's calculated tank temperature by 5°
above or below current reading. Adjustable range is -5°F
to +5°F.
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 or "CANCEL" to discard the new
setting and retain the previous setting.
NOTE: This same procedure can also be used to adjust
the Differential and the Upper Probe Offset user settings.
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