4.3 Main dimensions .................................................18
4.4 Installing the mounting frame ...........................19
4.5 Positioning the boiler .........................................19
4.6 Hydraulic connections .......................................20
4.6.1
Flushing the system ..............................................20
4.6.2 Water flow rate ......................................................20
4.6.3 Connection of the heating circuit ...........................21
4.6.4 Connection of the water circuit for domestic
use ........................................................................21
4.6.5 Connecting the expansion vessel .........................21
4.6.6 Connecting the condensate discharge pipe ..........22
4.6.7 Automatic air bleed ...............................................23
4.7 Gas connection ...................................................23
4.8 Flue gas system connections ............................24
4.8.1 Classification .........................................................24
4.8.2 Lengths of the air/flue gas pipes ...........................25
4.8.3 Additional Directives ..............................................26
4.9 Electrical connections ........................................27
4.9.1 Control unit ............................................................27
4.9.2 Recommendations ................................................27
4.9.3 PC/Laptop connection ...........................................28
4.9.4 Connecting service tool .........................................28
4.9.5 Access to the connector block ..............................29
4.9.6 Connection options ...............................................29
4.10 Electrical diagram ...............................................33
4.11 Filling the system ...............................................33
4.11.1 Water treatment ....................................................33
4.11.2 Filling the siphon ...................................................34
4.11.3 Filling the system ..................................................35
4.11.4 Venting the system ................................................35
5 Commissioning ........................................................................................37
5.1 Connection box ...................................................37
5.1.1 Control panel .........................................................37
5.2 Check points before commissioning ................38
5.2.1 Preparing the boiler for commissioning .................38
5.2.2 Hydraulic circuit .....................................................38
5.2.3 Electrical connections ...........................................38
5.3 Commissioning the boiler ..................................39
5.4 Gas settings ........................................................40
5.4.1 Gas circuit .............................................................40
5.4.2 Adapting to another gas type ................................40
5.4.3 Setting the air/gas ratio (Full load) ........................41
5.4.4 Setting the air/gas ratio (Part load) ......................43
Contents
210212 - 7601972-03
2