Boiler management system

Question 1

What inputs does the flame safeguard primary control receive?

Answer 1

Flame detector, controller, and limits

Question 2

What outputs does the flame safeguard primary control output?

Answer 2

Burner motor, ignition transformer, pilot valve, main fuel valve

Question 3

What additional inputs does a flame safeguard programming control receive?

Answer 3

A Flame Safeguard Programming Control (FSG) adds timing capability that enables the control to time the sequence functions like purges and ignition trial periods and adds interlocks to the inputs

Question 4

The trial for ignition period of a main burner flame from an intermittent or interrupted pilot flame shall not exceed how many seconds?

Answer 4

10 seconds

Question 5

When combustion air is supplied by mechanical means and the ignition is by means of a direct spark, interrupted pilot or intermittent pilot how many combustion zone/flue passage air changes are required?

Answer 5

4 air changes

Question 6

All Flame Safeguards must perform what three basic functions?

Answer 6

• Check itself against unsafe failure by checking for a flame-simulating condition before start-up. If a condition is present the burner cannot start.
• Sequence the operation, start, run and shutdown of the burner system
• Supervise the presence of a flame, cutting off the fuel supply if a flame is not present

Question 7

What are the two trial for ignition settings that are field selectable on a RM7890 Flame Safeguard?

Answer 7

4 or 10 seconds

Question 8

On a RM7890 what two things will happen if flame is lost during the Main Flame Establishing Period?

Answer 8

The control will lock out and alarm will be triggered

Question 9

What happens if the RM7890 senses a flame during the standby period?

Answer 9

The control will lock out and present a fault