Logamatic EMS RC35 user interface - Subject to technical modifications. 33
Entering system settings (Service menu – Settings)
6
6.3.3 Characteristic heating curve
Parameters: Standard temperature, maximum and minimum supply temperature and room
temperature offset (parallel shifting of characteristic heating curve)
The characteristic heating curve forms the basis for economical and easy operation of the heating
system with outdoor reset. To calculate the characteristic heating curve, the Logamatic control uses
a number of parameters.
This calculation takes into account the “delayed” response to outdoor temperature changes and the
room temperature. The room temperature is internally calculated, based on target room temperature
and the room influence factor.
This allows the user to influence the heating characteristics directly by modifying the target room
temperature.
The heating characteristic curve (Æ Fig. 6, page 34) is determined by the base point and end point.
The base point is located at 14 °F (–10 °C) supply temperature at a room temperature of 68 °F
(20 °C). The end point of the heating characteristic curve must be set in accordance with the design
temperature of the heating system.
The gradient of the heating characteristic curve (the shape of the curve) is determined by the param-
eters minimum outdoor temperature (the lowest outdoor temperature expected in a particular
region, Æ page 26) and the standard temperature (the supply temperature which should be
reached when the outdoor temperature is at minimum) (Æ Fig. 6, left).
The minimum supply temperature parameter can be used to define a minimum target value
(Æ Fig. 6, [4]). If the temperature falls below this value, the burner is fired.
The characteristic heating curve can be shifted, up or down, in parallel to the original curve, by
adjusting the room temperature offset parameter and/or the set room temperature
(Æ Fig. 6, right). This feature should be used if, for example, the room temperature measured with
a thermometer differs from the set target value.
The x-axis of the heating characteristic curve shown on the display covers the range
from +68 °F to –4 °F (+20 °C to –20 °C). With the parameter std. tmp., the minimum
outdoor temperature is represented by a circle. However, the diagram will not be quite
correct if a minimum outdoor temperature below –4 °F (–20 °C) is entered (the circle
will no longer be on the heating characteristic curve).
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