User Settings & Control System Menus

Temperatures

Operating Set Point And Differential Adjustment

The Operating Set Point is adjustable from 90°F (42°C) to 180°F (82°C) for commercial and 160°F (71°C) on residential models. The factory setting is 120°F (49°C). The Differential is adjustable from 2° to 20°. The factory setting is 8°. These user settings are accessed from the Temperatures menu. These instructions explain how to adjust these settings and navigate the control system.

When the water temperature sensed by the control system from the Temperature Probe reaches the Operating Set Point the control system will end the heating cycle. A heating cycle will be activated again when the sensed water temperature drops below the Operating Set Point minus the Differential setting.

Note: Set the Operating Set Point to the lowest setting which produces an acceptable hot water supply for most efficient use. Lower Differential settings may cause excessive heating cycles (short-cycling) which can cause premature failure of components such as the Igniter. Set the Differential at the highest setting which produces an acceptable hot water supply to prevent short cycling.

Description/Action

Display

 

 

From the Desktop screen, press the Operational Button under

 

 

 

MANUFACTURER / MODEL INFORMATION

 

MENU. The "Main Menu" screen will be displayed.

 

 

 

 

 

Tank Temperature

120°F

 

Operating Set Point

120°F

 

Status: Standby

 

 

 

 

 

MENU

 

HELP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The Main Menu is where all control system menus are listed,

 

 

 

 

 

 

 

 

 

 

 

 

Main Menu

 

 

 

 

see Table 5 for a complete list and description of control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

system menus. Use the Up and Down Buttons to view all

 

Temperatures

 

 

 

 

 

 

 

 

 

 

control system menus from the Main Menu.

 

 

 

 

 

 

 

 

 

 

Heater Status

 

 

 

 

 

 

 

 

 

 

 

 

With Temperatures menu selected (highlighted in black) in

 

Display Settings

 

 

 

 

the Main Menu screen, press the Operational Button under

 

Heater Information

 

 

 

 

“SELECT” to enter the Temperatures menu.

 

 

 

 

 

If the Temperatures menu is not selected use the Up and Down

 

Current Fault

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Buttons to select this menu item.

 

 

 

 

 

 

 

 

 

 

 

SELECT

 

BACK

HELP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

With the Operating Set Point selected in the Temperatures

Temperatures

 

menu, press the Operational Button underneath “CHANGE” to

 

Operating Set Point

 

120°F

activate the adjustment mode for this menu item.

 

If Operating Set Point is not selected use the Up and Down

Differential

 

8°F

Tank Temperature

 

120°F

Buttons to select this menu item.

Tank Probe Offset

 

0°F

 

 

Note: Higher Temperature settings increase wear and

 

 

 

operating costs. Set the Operating Set Point to the lowest

 

 

 

setting which produces an acceptable hot water supply. This

 

 

 

will always provide the most energy efficient operation and

CHANGE

BACK

HELP

longer life.

 

 

 

With the adjustment mode for the Operating Set Point activated

Temperatures

 

the selection bar will change from a black fill to a black outline.

 

Operating Set Point

 

140°F

Use the Up and Down Buttons to change the current setting.

 

Differential

 

8°F

Press the Operational Button under "UPDATE" to save the

Tank Temperature

 

120°F

Tank Probe Offset

 

0°F

new setting. Press the Operational Button under "CANCEL" to

 

 

 

 

discard changes and return to the previously saved setting.

 

 

 

Note: Use this same procedure to change the Differential

 

 

 

setting and other adjustable user settings in the control system

UPDATE

 

CANCEL

menus.

 

 

 

 

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A.O. Smith 317443-000 User Settings & Control System Menus, Temperatures Operating Set Point And Differential Adjustment
Page 39 Page 41

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