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5790 733 - 07
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Burner Control Unit Flow Diagram
Burner Control Unit
System Start
Input evaluation
Phase
Air pressure switch 1 LDW1
Gas pressure switch 1 GDW1
Air pressure switch 2 LDW2
Fan speed
Flame
Requirement
Gas valve V1
Gas valve V2
Auxiliary valve/ Servomotor
Flue gas damper
Ignition
Fan
Fault message output
Relay test
Start-up
Operation
Shutdown
Wait state
Error state
Subsequent state depends on
the parameterization of the
valve test.
Output activation
Non-valuated input
Input must be active for continued operation
Input must be passive for continued operation
Signal change is expected for continued operation
Output is active
Valuation is performance-linked
