John Wood Envirosense Power Direct Vent (May 2010 or later) - Manuel (Page 43)

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DISPLAY SETTINGS
DESCRIPTION/ACTION DISPLAY
Select Display Settings from the Main Menu and press the
Operational Button under "SELECT" to enter this menu. This menu
contains adjustable display options for viewing information on the
LCD screen. Use the Up & Down Buttons to navigate the menu.
• Temperature Units - Adjustable user setting that changes
temperature units display to Celsius °C or Fahrenheit °F.
• Backlight Delay - Adjustable user setting that determines how
long the LCD backlight remains illuminated after a key has
been pressed. Available settings are; Always Off, 10, 30 or 60
seconds and Always On.
• Contrast - Adjustable user setting to adjust the LCD screen
contrast between text and background.
NOTE: These settings are adjusted in the same way described
for the Operating Set Point and Differential Adjustment.
Temperature Units °F
Backlight Delay 30s
Contrast 60%
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Display Settings
HEATER INFORMATION
DESCRIPTION/ACTION DISPLAY
Select Heater Information from the Main Menu and press the
Operational Button under "SELECT" to enter this menu. This menu
contains non adjustable operational information.
• Elapsed Time - Total accumulated time the control system
(water heater) has been energized.
• Burner On Time - Total accumulated time the control system
has been in the heating operating state; burner run time.
• Total Cycle Count - Total accumulated count of heating
cycles.
• Config CRC - A number associated with the configuration
data.
• CCB Version - Software version for central control board.
• UIM Version - Software version for user interface module.
NOTE: Historical data is stored in the CCB's memory. If this CCB
is replaced during servicing the historical data on the CCB being
replaced will be lost. The data stored in the new circuit board will
no longer reflect the entire history of the water heater.
The Elapsed Time, Burner On Time and Cycle Count indicate
age, usage and wear.
If the Cycle Count per day is high (divide cycle count by days
to determine cycles per day) or the cycle duration is short
(determine burner on time total minutes, divide burner on time
total minutes by cycle count) consider raising the Differential
setting to avoid short cycling and excessive component wear,
see Operating Set Point and Differential Adjustment.
This historical data can also be used to assist facilities managers
in forecasting planned replacement of equipment to help avoid
lengthy and costly hot water supply interruptions.
• Use External Enable - Enable/ Disable external control
function.
• External Enable Status - Status of external enable if Use
External Enable is Yes.
• Ignition Trials - The maximum number of ignition trials before
lockout.
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