Buderus Logano plus GB312 Installation And Service Instructions Manual page 3

8 Shutting down the heating system . . . . . . . . . . . . . . . . . . . . . 40
8.1 Shutting down the heating system by means of the
controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.2 Shutting down the boiler in an emergency . . . . . . . . . . 40
8.2.1 Emergency shut-down . . . . . . . . . . . . . . . . . . . . . . . . . . 40
9 Heating system inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
9.1 Preparing the boiler for inspection . . . . . . . . . . . . . . . . 40
9.2 General operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9.3 Checking the flue system, including the combustion
air supply, air inlet/outlet openings . . . . . . . . . . . . . . . 41
9.4 Checking the heating system operating pressure . . . . 41
9.5 Measuring the carbon dioxide content . . . . . . . . . . . . . 41
9.6 Determining how dirty the burner and heat exchanger
are and cleaning them . . . . . . . . . . . . . . . . . . . . . . . . . . 42
9.6.1 Determining the extent of contamination . . . . . . . . . . . 42
9.6.2 Cleaning the burner and heat exchanger . . . . . . . . . . . 43
9.7 Checking gas valve for leaks . . . . . . . . . . . . . . . . . . . . . 47
9.8 Checking for leaks during normal operation . . . . . . . . . 48
9.9 Check ionization current . . . . . . . . . . . . . . . . . . . . . . . . 48
9.10 Completing inspection or maintenance . . . . . . . . . . . . 48
9.10.1 Removing instruments . . . . . . . . . . . . . . . . . . . . . . . . . . 48
9.10.2 Installing jacket panels . . . . . . . . . . . . . . . . . . . . . . . . . . 48
9.10.3 Confirming inspection or maintenance . . . . . . . . . . . . . 48
9.11 Servicing and maintenance logs . . . . . . . . . . . . . . . . . . 49
10 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
10.1 Identifying operating status and resetting faults . . . . . 51
10.2 Operating and fault indications . . . . . . . . . . . . . . . . . . . 52
10.2.1 Status indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
10.2.2 Fault displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
10.3 Troubleshooting the safety sequence/pressure switch 61
11 Sensor characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
12 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
13 Circuit diagram, internal boiler wiring . . . . . . . . . . . . . . . . . . 88
14 Examples of Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
14.1 Boiler, low-loss header, AM10 . . . . . . . . . . . . . . . . . . . 89
14.2 Boiler, low-loss header, Logamatic 4000 . . . . . . . . . . 90
14.3 2 Boilers , low-loss header, Logamatic 4000 with
FM456 Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
List of keywords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Logano plus GB312 - 6 720 806 273 (2013/01)
Table of contents
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