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Siemens Building Technologies Electronic Air / Fuel Ratio Control System CC1P7873.1en
HVAC Products 15.10.2002
Contents
1 Safety notes.....................................................................................................4
1.1 Warning notes..................................................................................................4
1.2 Mounting notes ................................................................................................4
1.3 Installation notes..............................................................................................4
1.4 Commissioning notes ......................................................................................4
1.5 Norms and standards.......................................................................................4
1.6 Service notes ...................................................................................................5
1.7 Disposal notes .................................................................................................5
2 Front view and basic design ............................................................................6
3 General ............................................................................................................7
3.1 Application .......................................................................................................8
4 Product range overview .................................................................................11
5 Description of functions .................................................................................13
5.1 Burner startup ................................................................................................13
5.2 Startup ...........................................................................................................14
5.3 Burner operation ............................................................................................15
5.4 Shutdown .......................................................................................................18
5.5 Function description of power ON and reset..................................................19
5.6 Selection of type of fuel .................................................................................20
5.7 Compensation of hysteresis ..........................................................................22
5.8 Application of a correcting variable................................................................24
5.9 Load signal output «X1» ................................................................................26
6 Sequence of functions ...................................................................................27
6.1 RVW25... and RVW26... with the burner control............................................27
6.2 Explanations relating to the sequence diagram.............................................27
6.3 Sequence diagram.........................................................................................28
7 Basic diagram ................................................................................................29
8 Block circuit diagram......................................................................................30
9 Assignment of terminals and description of inputs / outputs (I / O)................31
9.1 Assignment of terminals ................................................................................31
9.2 Description of the inputs / outputs .................................................................32
10 Display on the control unit .............................................................................33
11 Handheld terminal AZW20.20........................................................................34
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