10 Questions
What is the purpose of the post-purge in the shutdown sequence described in the text?
To ensure complete combustion and clear out any remaining combustible gases
In the shutdown sequence described, what does the programming controller do if the SSOV proof-of-closure switches do not close within 5 seconds during standby?
Remains in standby until the condition is corrected
What initiates the shutdown sequence for the burner as per the text?
Permissive or a burner safety switch
During the shutdown sequence, what action causes the flame to be extinguished?
De-energizing the SSOVs
What happens if there is a call for heat during the shutdown sequence?
Startup sequence is repeated
What component in the shutdown sequence allows 5 seconds for proof-of-closure switches to close?
Programming controller
If the steam pressure rises above the set point of the operating control, what occurs next in the shutdown sequence?
Call for heat ends
What action signifies that all permissives and pre-ignition interlocks are satisfied in the startup sequence?
'Call for heat' is initiated
'Shutdown Sequence' mentioned in the text is initiated when:
'Steam pressure' rises above set point
In case of an error where 'proof-of-closure switches' do not close, what will happen to the 'programming controller'?
Remains in standby until switches close.
Test your knowledge on how the boiler primary control system functions. Learn about the process of keeping the main burner in operation, controlling steam pressure, and restarting when necessary.
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