Vitocal 200 has two different settings for adjusting run times with systems without buffer. Parameter 7304 is secondary hysteresis. Default is 2.0K Parameter 7313 is heating stopping hysteresis. Default is 2.0K If heating curve requires 30 degrees, pump will start returning When water is 30-5-2 (7304) = 23 and it will stop When temperature is 30-5 + 2 (7313) = 27 degrees. So machine will heat water a total of 4 degrees. You have to enter to coding level 2 to change thesis parameters. You can find instructions how to enter code level 2 by using Google with Following words "Coding level 2 Vitocal uk" Open first available pdf to get instructions.
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