Hello , I have Viessmann solar system installed since 2 years .... System 1 , with one set of collectors (~9.8 sqm) and one cylinder ( ~ 900L). I want works very well , expecially collector cooling and reverse cooling features it very sunny days with low usage ... Problem is only one - then I leave to holidays forget to lower Tcyl set to 50-60 degrees ( usualy , then I am at home I have set 85 degrees t ohave up tp 3 days heat reserve in non sonny days ) in summer time cylinder and collector is overheated until safety shutdown temperatures. Then T cyl set is 50 and no use ,system works stable - dytime heats up to 80 and night time cools down to 50 without overloads. Question - is it possible to have a solution ( maybe additional hardware needed) in order to switch between T cyl set two temperatures with relay contact ? ( for example 60 and 80 ) so Home automation or kid can do this can do this without entering complex programming ... Thank you very much , Kastytis
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