Logano plus SB315, SB615, SB745 - Buderus

System examples8Area of application• Logano plus SB315, SB615 and SB745 floorstanding condensing boilers• Logamatic boiler and heating circuit control unitFunction descriptionBoth floor standing condensing boilers can be shut offhydraulically. The boiler sequence can be switched on thebasis of load and time. The lead boiler starts when theactual temperature falls below the set flow temperature.The lag boiler is hydraulically shut off by the relevantbutterfly valve DV until it starts operating.When the heat demand increases, the lag boiler is startedautomatically via the relevant butterfly valve DV. When theload falls, the switching processes run in reverse order.Special design information• If a boiler sequence reversal is required, set thismanually or automatically.• We recommend distributing the total output betweenthe boilers so each has 50 %.• Design the connections in such a way that the boilerscan be separated, independently of each other, toensure an emergency supply during maintenance work.• Make the boiler pipework connections in accordancewith the “Tichelmann system”. If the pipework is routedawkwardly or the load is split unevenly, regulatingvalves must be installed.You can check the system hydraulics (5-5-1-2-1) in the Buderus hydraulics database atwww.buderus.de/hydraulikdatenbank.Technical guide Floor standing gas/oil condensing boilers Logano plus SB315, SB615, SB745 – 6 720 802 589 (2012/01) 61