John Wood Envirosense Power Direct Vent (May 2010 or later) - Manuel (Page 42)

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TEMPERATURES (CONT)
DESCRIPTION/ACTION DISPLAY
• Tank Probe Offset - adjustable user setting, range -5° to +5°F
(factory setting 0°F).
The Tank Probe Offset is used to calibrate control system
temperature sensing. This offsets to more effectively read
point of use temperature in the tank. This feature can also be
used to compensate for building recirculation loops (hot water
returning to the storage tank) that may cause the heating cycles
to terminate prematurely.
Example: If the current sensed temperature from the temperature
probe is 120°F (49°C) and the Offset setting for the probe is
adjusted to a value other than 0°, the control system would
calibrate or “offset” the sensed temperature from the probe.
Heating cycles would be activated and deactivated based on
the calibrated (offset) temperature.
NOTE: The Tank Probe Offset should only be used if the hot water
supply temperature varies greatly from the Operating Set Point
setting. These settings are adjusted in the same way described
for the Operating Set Point and Differential Adjustment.
Operating Set Point 140°F
Differential 8°F
Tank Probe Offset 0°F
CHANGE BACK HELP
Temperatures
HEATER STATUS
DESCRIPTION/ACTION DISPLAY
Select Heater Status from the Main Menu and press the Operational
Button under "SELECT" to enter this menu. This menu contains non
adjustable operational information. Use the Up & Down Buttons to
navigate the menu.
• Status - displays the current Operating State, see “Table 13 –
Operating States” for a description of the various operational
states.
• ECO Contact, Blocked Inlet PS, Blocked Outlet PS, Blower
Prover PS - displays the current state of the switch contacts;
open or closed.
• Igniter On, Gas Control Valve On - displays whether or not
the control system is currently energizing these water heater
components; yes = energized, no = de-energized.
• Flame Detected - displays whether or not the control system
has detected Main Burner flame during ignition from the Flame
Sensor.
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