To establish or "characterize" a heating curve to an application to deliver a more accurate level of
heating, specify the following:
Type of emitter - Once the emittter is selected the controller loads the factory defaults.
Design Supply ° – the desired boiler outlet temperature to occur on the coldest day. Use
this temperature when performing heat loss calculations.
Design Outdoor ° – the coldest expected outdoor air temperature typically experienced at
the installation site. Use this temperature when performing heat loss calculations.
Design Indoor ° - the desired and comfortable temperature to be maintained in the space or
building. Use this setting when performing heat loss calculations.
The Indoor Setpoint °- the lowest supply target temperature corresponding to the Design
Indoor temperature. Indoor Setpoint° can be set to the same temperature as the Design
Indoor°. Adjust the setting up or down to increase or reduce heating and to "fine tune" for
the most comfortable indoor temperature.
Tip
To increase heat, use the Indoor Setpoint° setting to adjust the water outlet
temperature, not the Design Indoor temperature setting.
Summer Shutdown - cut-off temperature level for further heating. We strongly recommend
using this feature with a value 5 °F-10 °F/3 °C-6 °C below the Indoor Setpoint ° to avoid
short cycling of the boiler during very low heating conditions. The controller must receive a
valid signal from the outdoor sensor, supplied with the boiler, for Summer Shutdown to
operate correctly.
When defining the above settings, factor in space or building heat loss. See also Setting the
supply differential in heating modes on page 29.
2.3 Set Point
Set point refers to the temperature set in the controller, not to the temperature read from a room
thermostat. Since the set point is measured at the temperature of water flowing (outlet) from the
supply temperature to the boiler, and not from the air surrounding a wall thermostat, the boiler may
shut down, thinking it has satisfied the set point while the required wall thermostat temperature may
not have been met.
Section: Operating concepts
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