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21.0 VIEWABLE AND CHANGEABLE CONTROL PARAMETERS
Before changing parameters, note the settings so that the unit can be returned to its origanal
operating parameters. These can be uploaded to a USB for later use see 21.10.1.
21.1
GENERAL
21.1.1
VACATION MODE
This parameter forces the DHW set points to decrease by the amounts programmed in the Night Setback Offset
parameters. This is used to save energy, such as when the building is unoccupied for an extended period of time.
For this function to work, the DHW Night Setback Offset parameters must be set to a value higher than 0°. The
default value of this parameter is OFF.
21.1.2
TIME AND DATE
The control uses an internal clock for the night setback feature and for logging of events. For these features to work
correctly, the clock must be set when the water heater is first installed or anytime the water heater has been powered
off for more than four (4) hours. This parameter must be accessed to set the clock.
The internal clock does not adjust for British summer time and therefore, will require a manual
adjustment. The clock is automatically updated whenever a pc is connected and the Win_Pro-
installer program is started.
21.1.3
SOFTWARE VERSION
The software version allows the user to view the software version in use by the control. This software controls the
operation of the water heater. When a new software version becomes available, the existing control can be replaced
with a new control to update the software.
Software version is read only.
21.1.4
TEMPERATURE UNITS (°C / °F)
The control can be configured to display temperature in either °C or °F. This parameter can be changed by the user
or the installer by accessing the Temperature Units parameter. The default is °F.
21.1.5
DOMESTIC HOT WATER (DHW) NIGHT SETBACK OFFSET
Once the unit's internal clock has been set correctly, the Night Setback feature can be used to program a lower set
point during unoccupied times. When in night setback, the control reduces the set point by a fixed amount. For DHW,
it subtracts the DHW night setback offset from the tank set point (Tank Set point parameter).
The DHW night setback will not work without a tank sensor installed.
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