4.2 Turn off the water heater................................................... 24
4.2.1 Turn off for a short period.................................................. 24
4.2.2 Isolate from the mains...................................................... 24
4.2.3 Turn off for a long period................................................... 24
Installation, Maintenance and Service part.............. 25
5 Introduction.............................................................................. 27
5.1 About the water heater..................................................... 27
5.2 Working principle..............................................................27
6 Safety........................................................................................29
6.1 Safety instructions............................................................29
6.2 Instructions on the water heater.........................................30
6.3 Safety devices..................................................................31
6.4 Environmental aspects...................................................... 33
6.4.1 Recycling.........................................................................33
6.4.2 Disposal.......................................................................... 33
7 Water heater............................................................................. 35
7.1 Structure of the water heater............................................. 35
8 Installation............................................................................... 37
8.1 Packaging........................................................................37
8.2 Conditions....................................................................... 37
8.2.1 Ambient conditions........................................................... 37
8.2.2 Maximum floor load.......................................................... 37
8.2.3 Water composition............................................................ 37
8.2.4 Working clearances...........................................................38
8.3 Installation diagram..........................................................38
8.4 Water connections............................................................ 39
8.4.1 Cold water connection....................................................... 39
8.4.2 Hot water connection........................................................ 40
8.4.3 Circulation connection....................................................... 40
8.5 Condensate drain............................................................. 40
8.6 Gas connection.................................................................40
8.7 Venting system................................................................ 41
8.7.1 C13/C33 concentric systems.............................................. 43
8.7.2 C13/C33 parallel systems.................................................. 45
8.7.3 C43/C53/C63 systems.......................................................47
8.8 Electrical connections........................................................ 48
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