4.3.2 Location of the boiler .............................................21
4.3.3 Main dimensions ...................................................27
4.4 Hydraulic connections .......................................29
4.4.1 Flushing the system ..............................................29
4.4.2 Connection of the heating circuit ...........................29
4.4.3 Connecting the condensate discharge pipe ..........30
4.5 Gas connection ...................................................30
4.6 Connections for the air and exhaust
pipes ....................................................................31
4.6.1 Classification .........................................................32
4.6.2 Outlets ...................................................................32
4.6.3 Lengths of the air/flue gas pipes ...........................32
4.6.4 Additional Directives ..............................................35
4.6.5 Connection of the combustion gas exhaust
pipe .......................................................................36
4.6.6 Connection of the air intake pipe ...........................36
4.7 Electrical connections ........................................37
4.7.1 Control unit ............................................................37
4.7.2 Recommendations ................................................38
4.7.3 Standard control PCB ...........................................38
4.7.4 Connecting the on/off control ................................40
4.7.5 Connecting modulating controller .........................40
4.7.6 Shutdown input .....................................................40
4.7.7 Release input ........................................................40
4.7.8 System pump ........................................................41
4.7.9 PC/Laptop connection ...........................................41
4.7.10 Connection possibilities for the PCB (SCU-
D4) ........................................................................41
4.8 Optional electrical connections ........................42
4.8.1 Connection possibilities for the PCB (SCU-
S05) .......................................................................42
4.9 Electrical diagram ...............................................47
4.10 Filling the system ...............................................47
4.10.1 Water treatment ....................................................48
4.10.2 Filling the siphon ...................................................49
4.10.3 Filling the system ..................................................49
5 Commissioning ........................................................................................50
5.1 Control panel .......................................................50
5.2 Check points before commissioning ................50
5.2.1 Preparing the boiler for commissioning .................50
5.2.2 Gas circuit .............................................................51
5.2.3 Hydraulic circuit .....................................................51
5.2.4 Connections for the air and exhaust pipes ............51
5.2.5 Electrical connections ...........................................51
5.3 Commissioning the boiler ..................................51
5.3.1 DIEMATIC iSystem control panel ..........................51
Contents
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