Control System Operation; Buttons; Temperature Setpoint - A.O. Smith 100 Series Installation And Operating Manual

ON/OFF ON/OFF LOCK
LOCK/ SERVICE RADIATOR
UNLOCK (NOT IN
USE)
Figure 42. LCD Display
ICONS
• ON/OFF: visible when heater has power but is OFF.
• LOCK: visible when keypad locked.
• RADIATOR: not used
• SERVICE: visible when heater is in service modes.
• FLAME: visible when burner is in run mode.
• CELSIUS: visible when a temperature is shown and the unit is
°C.
• FAHRENHEIT: visible when a temperature is shown and the
unit is °F.
• WARNING: flashing during fault conditions.

BUTTONS

• (ON/OFF) - This button is used to switch On/Off the heater.
• (Lock/Unlock) - This button is used to Lock/ Unlock the
control.
• (Plus and Minus) - These two buttons are used to make
changes of the setpoint and to navigate throughout the menus.
Combinations of the buttons are used for other functions, as per the
following paragraphs:
ON/OFF
When the heater is OFF the only active (unlocked) button is the
button. The LCD display shows only the ON/OFF icon. This icon
informs the user that the heater is connected to electric power. When
in OFF, the heater completely ignores the call for heat and never
ignites the burner. The user can turn the heater ON by pressing the
button for 3 seconds.
When the heater is ON, the ON/OFF icon is not shown. Setpoint/
Error codes are shown on LCD. Lock/Unlock, °C, °F, flame, service
and warning icons are active and shown according to heater status
and setting.
LOCK/UNLOCK
The control can be locked either by pressing the
seconds or automatically after 30 seconds without pressing any
button. When the control is locked the LCD will return to display the
setpoint (or error code if in a fault state). When the control is locked
and any button is pressed the lock icon on LCD will flash twice per
second. To unlock the control press
lock icon on LCD will turn off. When the control is locked the

CONTROL SYSTEM OPERATION

CONTROL SYSTEM OPERATION
FLAME ON CELSIUS PLUS
FAHRENHEIT WARNING MINUS
button for 3
button for 5 seconds and the
Temperature setpoint cannot be changed and the operating mode
cannot be changed.

TEMPERATURE SETPOINT

To adjust the temperature setpoint, unlock the control and press the
or buttons until reaching the desired value. The new value
will flash on the LCD display twice per second. To validate the new
setpoint, short press the
within 10 seconds, the new value will start to flash on the display,
and the setpoint goes back to the previous value being continuously
shown on LCD.
NORMAL MODE / VACATION MODE
The user can quickly change from the normal mode to the vacation
mode (and vice versa) by pressing the
simultaneously. In vacation mode the setpoint is 16°C (60°F) and
the differential is 5.5C° (10F°) independently of the outdoor
temperature. In Normal mode the LCD will display the actual setpoint
set by the user, in Vacation mode the LCD will display the vacation
setpoint.
BURNER IN OPERATION
When the burner is in operation and the flame is detected by the
flame sensor, the flame icon on LCD is on.
SWITCHING BETWEEN TEMPERATURE UNITS
To switch temperature units (°F/°C), unlock the control and press
button and the button simultaneously. The corresponding icon
on LCD °F or °C will be on.
FAULT INDICATION
If an error condition exists or a warning is in place, the LCD shows
the setpoint for 1 second and error code for 1 second. The warning
icon will flash once per second.
SERVICE MODE
To enter in the service mode, Unlock the control and simultaneously
press the and buttons for 3 seconds. In service mode the
service icon is on. While in service mode, pressing the
allows for cycling between service codes. The numeric display will
show the service code for 1 second, followed by the actual
measurement displayed for 3 seconds.
Example: H06-5.00 represents the service code of "H06 Blower
RPM target" and the value of "5.00" is the blower speed (5.00x1000
= 5,000 rpm).
The display will continue to show the service code and the
measurement value unless the
to the next item. To exit Service mode once again simultaneously
press the and buttons for 3 seconds. If no button is pressed
for 30 seconds the unit will revert back to operation mode where the
setpoint is displayed and the control is locked.
Simultaneously pressing the
the new altitude setting and also exit altitude setting and revert back
to "Service mode".
40
button. If the button is not pressed
and
or buttons are pressed to cycle
and buttons again will confirm
buttons
/ buttons