6720866940 (2017/11) US SSB
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Contents
1 Key to symbols and safety instructions .............. 3
1.1 Key to symbols..................................3
1.2 Safety instructions ...............................3
1.3 General warning.................................3
2
Product description .......................... 4
2.1 Introduction.....................................4
2.2 Proper use .....................................4
2.3 Start/Stop cycle .................................5
3
Boiler components ........................... 6
4
Main components............................7
4.1 Burner head ....................................8
4.2 Heat exchanger .................................8
4.3 Combustion chamber .............................8
4.4 Ignition electrode ................................8
4.5 Low Water Cut Off (LWCO) ........................9
4.6 Supply and return temperature sensors ...............9
4.7 Manual reset high limit ............................9
4.8 Flue temperature sensor .........................10
4.9 Fan ..........................................10
4.10 Gas valve .....................................10
4.11 Venturi .......................................10
4.12 Condensate trap................................11
4.13 Flue pressure switch ............................11
4.14 Pressure relief valve.............................12
5
Control Panel (LCD Display) .....................13
5.1 LCD Display description ..........................13
5.2 Date and time setting ............................13
5.3 Setting Central Heating CH and DHW setpoint ........14
5.4 Boiler information ...............................14
5.5 Outdoor reset (Climatic compensation) ..............15
5.6 Parameters list .................................15
6
Parameters description ........................17
6.1 Central Heating (CH) ............................17
6.2 Domestic Hot Water .............................18
6.3 Pump mode and connections......................20
7 Commisioning ..............................21
7.1 First operation .................................21
7.2 Inlet Gas Pressure ..............................21
7.3 Switching from NG to LPG ........................21
7.4 CO
2 Setting ...................................23
8
Maintenance schedule & procedures ................24
8.1 Gas Leak Inspection.............................24
8.2 Flue / Combustion air piping inspection ..............24
8.3 Checking for Wiring and connections................24
8.4 Burner Head Cleaning ...........................24
8.5 Cleaning the Heat Exchanger .....................26
8.6 Cleaning the Ignition Electrode ....................28
8.7 Inspection, replacement and features of supply, return
and flue NTC temperature sensors .................28
9
Electrical supply ............................29
9.1 Electrical supply wiring ...........................29
9.2 Access to the electrical terminal strip ................29
9.3 Main electrical supply ............................30
9.4 Room thermostat connection ......................30
9.5 DHW tank sensor connection......................30
9.6 Outdoor temperature sensor ......................30
9.7 Supplementary circulating pump relay ...............30
9.8 Electrical wiring diagram .........................31
9.9 Lockout errors list...............................32
9.10 Blocking errors list ..............................33
9.11 Errors not shown on display .......................35
10
Spare parts ................................36
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