Boiler Primary Control System Quiz

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What is the first step in the typical sequence of operation for most programming controllers mentioned in the text?

Pre-ignition Interlocks (correct)

Start draft fan

Start purge

High airflow

When does the BMS start the draft fan according to the sequence of operation outlined in the text?

After Ignite pilot

Before Pre-ignition Interlocks

After Pre-ignition Interlocks and High airflow (correct)

After Start purge

What initiates the increase in fan speed or combustion air damper position to high-fire position as per the text?

Low airflow

Start purge

High airflow (correct)

Ignite pilot

What marks the completion of the purge process as per the typical sequence of operation discussed in the text?

Low airflow Signup and view all the answers

When does the BMS ignite the pilot flame based on the sequence of operation detailed in the text?

After Low airflow Signup and view all the answers

What is the purpose of waiting up to 10 seconds after starting the igniter according to the text?

To stabilize the pilot flame Signup and view all the answers

What happens when the steam pressure or hot water temperature rises above the set point of the operating control?

The programming controller de-energizes the SSOVs Signup and view all the answers

What occurs during the programming controller's post-purge phase?

The flame is extinguished Signup and view all the answers

What does the programming controller do during standby mode?

Allows time for SSOV proof-of-closure switches to close Signup and view all the answers

If the SSOV proof-of-closure switches do not close during standby, what does the programming controller do?

Remains in standby mode until corrected Signup and view all the answers

When a call for heat is received and all permissives are satisfied, what does the programming controller do?

Repeats the startup sequence Signup and view all the answers

What will the BMS do if the pilot is too small to reliably light off the main burner?

Shut the pilot SSOV and lockout the burner system Signup and view all the answers

During the main flame trial for ignition period, what happens if the main flame is not established within 10 seconds?

A safety shutdown and lockout occurs Signup and view all the answers

What initiates the Safe Start stage in the operating sequence chart?

Power quality evaluation Signup and view all the answers

What happens if a flame is detected during the safe start check according to the text?

Controller returns to standby mode Signup and view all the answers

During the Pilot Trial for Ignition period, what is expected if the pilot flame is not proven within 10 seconds?

Safety shutdown will occur Signup and view all the answers

What does the BMS do if a permissive switch opens during the run period?

Shuts off SSOVs and conducts a post-purge of the furnace Signup and view all the answers

What happens if a flame is not detected during safe start check?

The controller begins the purge. Signup and view all the answers

Which component must be at the proper pressure to satisfy the low atomizing medium cut-off switch for an oil-fired boiler?

Atomizing medium Signup and view all the answers

What must be running to satisfy the low fuel pressure cut-off switch for an oil-fired boiler?

Oil pumps Signup and view all the answers

In a dual fuel boiler, what must be placed on either oil or gas depending on the fuel used?

Fuel selector switch Signup and view all the answers

What is required to initiate the boiler ignition sequence according to the text?

Closing the main electrical disconnect switch Signup and view all the answers

What does closing the on-off switch during initial startup lead to?

Initiating the firing sequence Signup and view all the answers

What is needed for the programming controller to move from standby mode to safe start check mode?

'On-off' and 'operating control' switches closed Signup and view all the answers

What happens if the pilot fails to light within 15 to 90 seconds?

The primary controller will go into safety shutdown and lockout. Signup and view all the answers

If the main flame goes out during the run period, what action does the burner take?

Goes into safety shutdown and lockout. Signup and view all the answers

What does the primary controller do in case of a second failed attempt to establish a pilot?

Goes into safety shutdown and lockout. Signup and view all the answers

What action is taken if the number of main flame failures in a call for heat cycle reaches 5?

A 5-minute natural draft purge is performed before attempting to establish a pilot. Signup and view all the answers

What must the operator do if there is an ignition failure during boiler startup?

Correct the problem and reset the control. Signup and view all the answers

What are the conditions that must be satisfied before a boiler can be started by its programming controller?

The pressure should be above the cut-in setting. Signup and view all the answers

What does the programming controller do if permissives and pre-ignition interlocks are not satisfied?

Purges the furnace first. Signup and view all the answers

What happens if there is a main burner failure during operation?

The programming control will lock out. Signup and view all the answers

What happens if there is an ignition failure during boiler startup?

The operator must manually ignite the burner. Signup and view all the answers

What happens in case of a main flame failure during operation?

The operator must correct the issue and reset the control. Signup and view all the answers

What happens when a safety shutdown and lockout occurs during the PILOT TRIAL-FOR-IGNITION PERIOD (PTFI)?

There is no pilot flame present at the end of the PTFI period Signup and view all the answers

When does the burner restart automatically in an automatically fired boiler?

When the operating control closes Signup and view all the answers

Which component of a natural draft gas-fired boiler is energized to light the pilot flame?

Ignition transformer and pilot SSOV Signup and view all the answers

What is a requirement for all fuel-fired boilers?

Built-in self-diagnostics Signup and view all the answers

What is indicated directly on the controller during a safety shutdown and lockout?

An ALARM light Signup and view all the answers

What happens during a safety shutdown if an SSOV proof-of-closure switch opens during the RUN period?

There is no flame present Signup and view all the answers

Which condition is likely to trigger a safety shutdown and lockout during the INITIATE period?

AC line power error occurred Signup and view all the answers

What occurs when an operating control opens in an automatically fired boiler?

'Call for heat' condition initiates Signup and view all the answers

'Shutdown without Lockout' occurs in an automatically fired boiler when:

'Call for heat' condition is initiated by pressuretrol Signup and view all the answers

'Safety Shutdown and Lockout' closes all SSOVs and locks itself out when:

'Pilot is intermittent, pilot SSOV is NOT energized' Signup and view all the answers

Boiler Primary Control System Quiz

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Questions and Answers

What is the first step in the typical sequence of operation for most programming controllers mentioned in the text?

When does the BMS start the draft fan according to the sequence of operation outlined in the text?

What initiates the increase in fan speed or combustion air damper position to high-fire position as per the text?

What marks the completion of the purge process as per the typical sequence of operation discussed in the text?

When does the BMS ignite the pilot flame based on the sequence of operation detailed in the text?

What is the purpose of waiting up to 10 seconds after starting the igniter according to the text?

What happens when the steam pressure or hot water temperature rises above the set point of the operating control?

What occurs during the programming controller's post-purge phase?

What does the programming controller do during standby mode?

If the SSOV proof-of-closure switches do not close during standby, what does the programming controller do?

When a call for heat is received and all permissives are satisfied, what does the programming controller do?

What will the BMS do if the pilot is too small to reliably light off the main burner?

During the main flame trial for ignition period, what happens if the main flame is not established within 10 seconds?

What initiates the Safe Start stage in the operating sequence chart?

What happens if a flame is detected during the safe start check according to the text?

During the Pilot Trial for Ignition period, what is expected if the pilot flame is not proven within 10 seconds?

What does the BMS do if a permissive switch opens during the run period?

What happens if a flame is not detected during safe start check?

Which component must be at the proper pressure to satisfy the low atomizing medium cut-off switch for an oil-fired boiler?

What must be running to satisfy the low fuel pressure cut-off switch for an oil-fired boiler?

In a dual fuel boiler, what must be placed on either oil or gas depending on the fuel used?

What is required to initiate the boiler ignition sequence according to the text?

What does closing the on-off switch during initial startup lead to?

What is needed for the programming controller to move from standby mode to safe start check mode?

What happens if the pilot fails to light within 15 to 90 seconds?

If the main flame goes out during the run period, what action does the burner take?

What does the primary controller do in case of a second failed attempt to establish a pilot?

What action is taken if the number of main flame failures in a call for heat cycle reaches 5?

What must the operator do if there is an ignition failure during boiler startup?

What are the conditions that must be satisfied before a boiler can be started by its programming controller?

What does the programming controller do if permissives and pre-ignition interlocks are not satisfied?

What happens if there is a main burner failure during operation?

What happens if there is an ignition failure during boiler startup?

What happens in case of a main flame failure during operation?

What happens when a safety shutdown and lockout occurs during the PILOT TRIAL-FOR-IGNITION PERIOD (PTFI)?

When does the burner restart automatically in an automatically fired boiler?

Which component of a natural draft gas-fired boiler is energized to light the pilot flame?

What is a requirement for all fuel-fired boilers?

What is indicated directly on the controller during a safety shutdown and lockout?

What happens during a safety shutdown if an SSOV proof-of-closure switch opens during the RUN period?

Which condition is likely to trigger a safety shutdown and lockout during the INITIATE period?

What occurs when an operating control opens in an automatically fired boiler?

'Shutdown without Lockout' occurs in an automatically fired boiler when:

'Safety Shutdown and Lockout' closes all SSOVs and locks itself out when:

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