Without radiation sensor: The controller uses the activation
gradient to calculate a required temperature increase over the long
term average of the reference temperature, which will start the
flushing process. Setting range: 0-99
➢ If one of the included functions is active, the controller will not try to start the system.
➢ If a radiation sensor is used, instead of Activation gradient the computer displays the
required radiation threshold above which the start function is to be active.
➢ If the collector sensor specified in the input variables under Reference temp. is heated by
the sun, the radiation sensor can often be dispensed with. In that case, anaverage will be
calculated for the collector temperature, with special weighting given to the lowest
temperatures reached. The start function is activated when the collector temperature is
hotter than the average by the differential of the activation gradient. A lower activation
gradient therefore leads to an earlier start attempt, and a higher gradient to later attempts. If
it takes more than ten attempts to start the system, the activation gradient should be
increased; if it takes less than four attempts, the gradient should be reduced.
➢ As soon as one of the included solar functions is activated during a start attempt, the start
function will be terminated once the interval time has elapsed.
➢ If the activation gradient is set to zero, then only the activation or interval time will apply and
the temperature curve at the collector sensor will be ignored.
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