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Start function STARTF (ideal for tube collectors)
Solar thermal systems sometimes start too late in the morning when the collector sensor
does not come into contact with the warm heat transfer medium in time. Flat collector fields
or vacuum tubes with forced circulation often lack sufficient gravity pull.
The start function tries to release a rinsing interval while constantly monitoring the collector
temperature. If the control output is allocated to the output, then analog step 100 is addition-
ally output at this control output.The computer first determines the current weather based on
constant measurements of the collector temperature. It then calculates the best time for a
brief rinsing interval to maintain the temperature for normal operation.
When the radiation sensor is used, the solar radiation is used for the calculation of the start
function (radiation sensor GBS 01 - non-standard accessory).
The start function is disabled ex works and only useful with solar thermal systems. When
activated, the following flow diagram applies:
ON / OFF Start function ON/OFF (ex works = OFF)
GBS Indicates a sensor input if a radiation sensor is used. If no radiation sensor is
used, the average temperature (long-term mean regardless of the weather) is
calculated. (ex works = --)
Setting range: S1 to S3 Input of radiation sensor
E1 to E6 value of the external sensor
GBS -- = no radiation sensor
Radiation value
Radiation thresh-
old
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