Figure 7 Standard "straight-line" reset heating
To determine these two points, and for the system to accurately control the supply/outlet water
supply, set the:
Design Supply ° – defines the desired boiler outlet water temperature to occur on the
coldest day for the building location. Corresponds to the Design Outdoor air temperature
appropriate for the geographic location. Consult the ACCA manual J to calculate the
Design Outdoor air temperature to perform heat loss calculations and to determine the
heating loads of the home or building.
High Limit° - defines the highest (maximum)water temperature allowed to prevent
overheating, or damage to piping or flooring.
Minimum Supply° - defines the minimum starting supply/outlet water temperature.
Summer Shutdown°- defines the cut-off level for outdoor temperature that prevents further
heating. The boiler ignores a call for heat.
We recommend using "Setup" to program standard reset heating. For a list of standard reset
heating settings, see Operational settings in the Setup menu: temperature ranges and defaults on
page 30.
Note
Thermostats and zone valves - Typical room thermostats simply provide a call for heat.
They do not control the circulating water temperature from the boiler. Adjustment of a
room thermostat from 72 °F/22 °C to 86 °F/30 °C will make no difference to the
delivered temperature if the floor slab has stabilized at the boiler temperature
determined by the reset curve.
Section: Operating concepts
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