John Wood Envirosense Power Direct Vent (May 2010 or later) - Manuel (Page 41)

41
USER SETTINGS & CONTROL SYSTEM MENUS
TEMPERATURES
OPERATING SET POINT AND DIFFERENTIAL ADJUSTMENT
The Operating Set Point is adjustable from 90°F (42°C) to 160°F (71°C). 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
MENU. The Main Menu screen will be displayed.
Operating Set Point 120°F
Status: Standby
MENU HELP
MANUFACTURER / MODEL INFORMATION
The Main Menu is where all control system menus are listed,
see “Table 14 – Control System Menus” for a complete list and
description of control system menus. Use the Up and Down
Buttons to view all control system menus from the Main Menu.
With Temperatures menu selected (highlighted in black) in
the Main Menu screen, press the Operational Button under
“SELECT” to enter the Temperatures menu.
If the Temperatures menu is not selected use the Up and Down
Buttons to select this menu item.
Temperatures
Heater Status
Display Settings
Heater Information
Current Fault
SELECT BACK HELP
Main Menu
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.
If Operating Set Point is not selected use the Up and Down
Buttons to select this menu item.
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
longer life.
Operating Set Point 120°F
Differential 8°F
Tank Probe Offset 0°F
CHANGE BACK HELP
Temperatures
With the adjustment mode for the Operating Set Point activated
the selection bar will change from a black fill to a black outline.
Use the Up and Down Buttons to change the current setting.
Press the Operational Button under "UPDATE" to save the
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
menus.
Operating Set Point 140°F
Differential 8°F
Tank Probe Offset 0°F
UPDATE CANCEL
Temperatures