OPERATING INSTRUCTIONS
20
V-10 TOUCH SCREEN BOILER CONTROLLER
For Reset Heating loads the Indoor Setpoint temperature setting will be
overridden for the programmed time periods. For Set Point loads the Boiler
Supply temperature setting will be overridden and for DHW loads the DHW
Tank Setpoint will be overridden. The DHW Boiler Supply temperature is also
overridden to keep the difference between the Boiler Supply and the DHW Tank
Setpoint temperature the same when the override is in effect.
The automated override feature will not work for DHW with simple aquastat
control where the DHW Tank Setpoint temperature has no effect.
Each load can have two automated programs per day of the week, Prog 1 and
Prog 2. Each program includes one override temperature that can be applied
during two separate programmable time periods; each period dened by a start
and a stop time in 24 hour clock format. If the programmed times overlap then
Prog 1 will supersede Prog 2.
The complete Temperature Override programming can be enabled or disabled for
each load independently without affecting the temperature and time settings for
each day of the week.
Temperature Override settings are accessed via the User Settings screen.
1.7.6 - Unoccupied Mode
Users can reduce energy consumption by switching the boiler to the unoccupied
mode during holidays or other away periods.
While in the Unoccupied mode, the DHW load is turned off, while a Reset
Heating load will have it’s circulating water temperature lowered by reducing
the Indoor Setpoint° to 50°F / 10°C. Set Point controlled loads are not adjusted
through this process, to avoid the potential for boiler cycling as there is no linkage
with the relevant thermostat.
On the User Settings screen the Occupied status is removed and Unoccupied
mode enabled by removing the check mark from the Occupied check box. For
changes to the Occupied status to be activated remember to press the Save
button to exit the User settings screen.
1.7.7 Summer Shutdown
Each space heating load except DHW has a Summer Shutdown° setting
that is used as a cut-off level for outdoor temperature to curtail any further
space heating. This is typically used to turn off Reset Heating loads once the
outdoor temperature exceeds a threshold level e.g. 65°F/18°C. The load will
be automatically reactivated once the weather returns to levels at/or below the
selected threshold. Use of this feature with a value 5°- 10°F/3°-6°C below the
Indoor Setpoint ° is strongly recommended to avoid short cycling of the boiler
during very marginal heating conditions.
The Summer Shutdown ° setting is available via the Installer Settings screen by
selecting Edit for the desired load. It is also available through Express Setup.
The controller must receive a valid signal from the outdoor sensor, supplied with
the boiler, for Summer Shutdown to operate correctly.
NOTE
If the outdoor sensor is
not connected the control
assigns 32°C / 0°F as the
current outdoor temperature.
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