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5 Operating Control and Displays
5.4.7 Check Digital Inputs/Outputs
Check Digital Inputs and Outputs
NOTICE
The signals ’Fuel selection oil’ and ’Fuel selection gas’ are logical and not physical signals.
Background: Some signals have more sources than one (terminals, LSB, field buses, param-
eters).
Fuel selection oil
Fuel selection gas
Burner ON
Fan ON/OFF
Fault
Ignition transformer ON/
OFF
Oil pressure min. is present
Gas pressure min. is present
SIC* oil is closed
Ignition valve ON/OFF
SIC* boiler is closed
Flame signal is present
Fault release
Oil pump OFF
* SIC = safety interlock chain
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