Entering system settings (Service menu – Settings)
6
RC35 programming unit - Technical specifications are subject to change without prior notice.
31
ature exceeds or falls below the target room temperature. If the maximum room influ-
ence parameter is set to 0, the heating characteristics will be controlled solely by
outside temperature.
6.3.3 Heating characteristics
Parameters: Standard temperature, maximum and minimum flow temperature and room
temperature offset (parallel shifting of heating characteristic curve)
The heating characteristics form the basis of economical and easy operation of the heat-
ing system with outside temperature control. To calculate the heating characteristics, the
Logamatic control system requires the entry of a number of parameters for the heating sys-
tem, from which the optimum heating characteristics are automatically calculated by a
mathematical formula.
This calculation takes into account the "delayed" response to outside temperature and the
room control temperature. The room control temperature is internally calculated, based on
the desired room temperature (target room temperature) and the room influence factor.
This allows the user to influence the heating characteristics directly by modifying the tar-
get room temperature.
The heating characteristic curve (Fig. 6, page 32) is determined by the base point and end
point. The base point is located at 20°C flow temperature at a room temperature of 20°C
with a delayed response to outside temperature of 20°C. The end point of the heating
characteristic curve must be set according to the standard temperature (i.e. the design
temperature) of the heating system.
The gradient of the heating characteristic curve (the shape of the curve) is determined by
the parameters minimum outside temperature (the lowest outside temperature
expected in a particular region; page 24) and the standard temperature (the flow tem-
perature which should be reached when the outside temperature is at minimum) (Fig. 6,
left).
The minimum flow temperature parameter can be used to define a minimum target
value (Fig. 6, 4). If the temperature falls below this value, the burner is switched back on.
The heating characteristic 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 tem-
The x-axis of the heating characteristic curve shown on the display covers the
range from +20°C to -20°C.
For the std. tmp. parameter, the minimum outside temperature set in the "plant
data" is indicated by a circle. However, the diagram will not be quite correct if
a minimum outside temperature below -20°C is entered (the circle will no long-
er be on the heating characteristic curve).
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