Buderus RC35 Operations Instructions download pdf (Page 32)

System settings (Service menu – Settings)

Logamatic EMS RC35 programming unit - Subject to technical modifications

6.3.3 Heating curve

Parameters: design temperature, maximum and minimum flow temperature and room temperature

offset (parallel offset)

The heating curve is the basis for economical and comfortable operation of the heating system with

weather-compensated control. To calculate this curve, the Logamatic control system requires you

to enter a number of parameters for the heating system, from which it automatically calculates the

optimum heating curve by means of a mathematical formula, taking the adjusted outside temperature

and room control temperature into account.

The room control temperature is an internal operand which is a combination of the required room

temperature (set room temperature) and room influence.

This can be used by the user to influence the heating curve directly by varying the set room

temperature.

The heating curve (Æ Fig. 7, page 33) is generally determined by its base and end points. The base

point is located at 20 °C flow temperature at a room temperature of 20 °C with an adjusted outside

temperature of 20 °C. The end point of the heating curve must be set in accordance with the design

temperature of the heating system.

The two parameters minimum outside temperature (the lowest outside temperature to be

expected in a region, page 25) and std. temp. (the flow temperature that should be reached at

minimum outside temperature) are crucial for the heating curve (level/slope) (Æ Fig. 7, left).

The minimum flow temperature parameter can be used to define a minimum set value (Æ Fig. 7,

[4], page 33). The burner starts again if the set value is no longer achieved.

The heating curve is offset in parallel either up or down by adjusting parameter rm. tmp. offset and/

or the set room temperature (Æ Fig. 7, right, page 33). Setting the offset may be advisable should

the room temperature measured by a thermometer deviate from the selected set value.

The X-axis of the heating curve graph refers to the range from +20 °C to – 20 °C.

For parameter std. temp. the minimum outside temperature set under system data is

shown by a circle. However, if a minimum outside temperature below – 20 °C is

entered, then the depiction is no longer accurate (the circle then lies away from the

heating curve).

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Buderus RC35 Operations Instructions Page 32