Logano plus SB315, SB615, SB745 - Buderus

5 Regulations and operating conditions1400kW12001000Kesselleistung Boiler output bei at 50/30° 50/30° [kW] [kW]Combustion output [kW]Feuerungswärmeleistung [kW]5.4 Control unit settingsWe recommend using a BuderusLogamatic control unit from the 4000 series.800600400200Fig. 2900 20 40 60 80 % 100Graph6 720 648 053-28.1TThe purpose of optimum control unit settings is to achievelong burner runtimes and avoid rapid temperaturechanges in the boiler. Gentle temperature changes resultin a longer service life of the heating system. The controlstrategy of the control unit must therefore be preventedfrom becoming ineffective, i.e. through the boiler watercontroller switching the burner on and off.B Maintain the minimum differential between the selectedshutdown temperature of the high limit safety cut-out,the temperature controller, the maximum boiler watertemperature and the maximum temperature demand( tab. 14).The maximum boiler water temperature canbe selected on the control unit (MEC) in the"Boiler parameters" menu, under menu item"Max. shutdown temperature".B Select set temperatures for the heating circuits that areas low as possible.B Start heating circuits (e.g. when starting up in themornings) at 5-minute intervals.If the Buderus Logamatic 4000 control unit isused, burner modulation in standard mode isnot enabled for 3 minutes. Never modulateupwards more quickly than this.Adjustable parameter (max. temperature) Logamatic 4321 Logamatic 4211High limit safety cut-out (STB) 1)110 °C 110 °C↓↑ at least 5 K ↓↑Temperature controller (TR) 1) 105 °C 90 °C↓↑ at least 6 K ↓↑↑at least 18 K↓Max. boiler water temperature 99 °C 84 °C↓↑ at least 7 K ↓↑Max. temperature demand 2) of HC 3) and DHW 4)92 °C 77 °CTable 14 Adjustable parameters Logamatic 4321 and Logamatic 42111) Set the high limit safety cut-out and temperature controller as high as possible, but ensure the settings are at least 5 K apart.2) Both temperature demands must always be at least 7 K below the maximum boiler water temperature.3) The temperature demand of heating circuits equipped with an actuator is composed of the set flow temperature and parameter "Boiler rise" inthe heating circuit data menu.4) The temperature demand of DHW heating is composed of the set DHW temperature and parameter "Boiler rise" in the DHW menu.38Technical guide Floor standing gas/oil condensing boilers Logano plus SB315, SB615, SB745 – 6 720 802 589 (2012/01)