Boiler Control Systems Quiz

What is the first step in the typical sequence of operation for most programming controllers when firing natural gas or oil?

During the programming controller sequence of operation, when does the BMS start the draft fan?

What does the BMS do after detecting high airflow in the programming controller sequence of operation?

In the programming controller sequence of operation, what follows after completing the purge?

What is the purpose of waiting for up to 10 seconds after igniting the pilot in the programming controller sequence of operation?

Which factor does NOT influence the variations in flame amplifiers, purge timers, and permissives on programming controllers according to the text provided?

What is the purpose of the post-purge mentioned in the text?

In the shutdown sequence described, what happens if the SSOV proof-of-closure switches do not close within 5 seconds?

Which component shuts off the burner in the described scenario?

What initiates the programming controller to de-energize the SSOVs in the shutdown sequence?

If all permissives and pre-ignition interlocks are satisfied, what action does the programming controller take?

What happens when a limit switch opens during operation of the burner?

What does the programming controller do in case of a safety shutdown and lockout?

During which period would an airflow proving switch opening lead to a safety shutdown?

What is the action of the BMS in case of detecting an internal fault?

Which type of boilers may use stack temperature relays to detect flame failure?

What is the condition referred to as when the operating control initiates a startup in natural draft gas-fired boilers with intermittent pilots?

What action does the primary controller take after the pilot flame is established in natural draft gas-fired boilers?

What happens if the pilot does not light within 15 to 90 seconds?

What does the primary control system do when the operating steam pressure or water temperature reaches the desired preset value?

In case of a main flame failure during operation, what is the immediate action taken by many primary controls?

What triggers the activation of the motor driving the draft fan and fuel oil pump in small mechanically-atomized packaged oil burners?

What is the result if the programming control detects an ignition failure during boiler startup?

How many pilot ignition retry attempts are usually permitted by primary controls?

What must occur before a steam or hot water boiler can be started by its programming controller?

If the main burner goes out during the run period, what is the next step?

What action does the primary controller take if pilot is not established on the second attempt?

What does a BMS do in small mechanically-atomized packaged oil burners when a call for heat is signaled?

What must be done if the boiler is gas-fired, according to the text?

What should be open if the boiler is so configured and requires low combustion air pressure?

What initiates the boiler ignition sequence?

What is required to be established before the programming controller starts counting the purge?

Which component opens slowly after allowing 10 seconds for the pilot flame to be established?

What does the flame detector sense after allowing 10 seconds for pilot flame establishment?

Why is it important to have manual resets on the cut-offs?

'Any combustion air damper or air supply interlocks must be satisfied.' What does this statement imply?

'Often, draft fans have a separate electrical feed.' Why is this highlighted in the text?

What action does the BMS take if the pilot is of inadequate strength or too small to reliably light off the main burner?

During which stage does the controller determine power quality?

What happens if the poor voltage conditions persist for more than 4 minutes?

What occurs during the Main Flame Trial for Ignition (MTFI) period?

If a permissive switch opens during the run period, what action does the BMS take?

When does the pilot trial for ignition period begin?

What triggers a safety shutdown and lockout according to the text?

What is the significance of the Safe Start stage within the BMS operation sequence?

What is the role of permissive switches during BMS operation?

When does the controller enter 'Standby' mode according to the text?