Rotex Controller Series, Продуктовая документация

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EbV Product documentation THETA NORM/UNIT
8-24
8.2.1.7 Screed function
NOTE: This function is not active if the heating circuit control is set at constant control (CC).
Function: The screed function is used exclusively for the required drying of newly applied
screed on floor heating systems. The process is based on recommendations of the
German Bundesverbandes Flächenheizungen (Federal Association for Surface
Heating) concerning the heating of fresh floor covers (heating according to a
mandatory temperature profile).
This is a special function that will not be interrupted by any other operating mode
(including manual operation or emission measurement)!
The screed function can be activated for mixer circuits and, in special cases (e.g. in
conjunction with a condensing boiler) also for a direct heating circuit.
When the screed function is active, all weather-dependent control functions of the
heating circuit concerned are switched off. The respective heating circuit operates
independent of the operating mode (switching times) as a constant temperature
controller.
An active screed function can be deactivated at any time (parameter setting screed
function = OFF).
On completion of the screed function, the heating circuit returns to operation
according the actual operating mode setting.
The screed function consists of two steps:
Step 1: Function heating acc. to DIN 4725 Part 4 (setting 1)
• Constant heating at 25 °C on the start day and for the following three days.
• Heating at set maximum flow temperature, limited to 55 °C.
Time profile of the screed function for function heating
Step 2: Heating function for floor covering (setting 2)
The heating of the floor covering follows a preset temperature profile.
Starting with 25 °C on the first day, the requested temperature rises by 5 °C per day
over the following days until the maximum temperature of the heating circuit is
reached. After that the nominal temperature is reduced with the same stepping until
the base point of 25 °C is reached again.
T
VLSet
[°C]
ST
t
[Days]
ST
t
[Days]