If pilot or low-fire flame occurs in a boiler which one would NOT be the possible cause?
a. Low fire switch open.
b. Insufficient pilot or low fire flame.
c. Supply to main nozzles restricted or cut off.
d. Inoperative programmer.
Answer: A
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Power Engineering Chapter 88
- A lockout switch will energize after __ to __ seconds.
- On-off controls are common on?
- If the damper motor does not operate on a boiler which one would NOT be the possible cause?
- If the burner stays on low fire on a boiler which one would NOT be the possible cause?
- If shutdown occurs during firing a boiler which one would NOT be the possible cause?
- If no ignition occurs when starting a boiler which one would NOT be the possible cause?
- If a blower does not start which one would NOT be the possible cause?
- On a boiler with high-low fire control, if the damper positioning switch is in the wrong position
- The second from last step in an automatic boiler programmed shutdown sequence is
- The operating pressure control will control the
- The function of a programming control is
- Automatic boiler programming controls
- When an automatic unattended boiler starts up, the program timer will first:
- The timer of a programmed combustion control consists of a motor and a:
- If a shutdown occurs during normal firing of a boiler and the steam pressure is below the normal cutout value, the problem could be:
- On a gas fired automatic boiler a normal programmed start-up takes approximately:
- If during the pilot trial for ignition period, the pilot does not ignite, a lockout will occur
- After extinguishing the main flame, the next step in a programmed burner shutdown is
- An interrupted pilot of an automatic boiler:
- During a programmed start-up if an igniter spark is visible but no flame appears the operator should suspect:
- Boiler furnaces are purged:
- If the pilot flame is adequate but the main burner fails to ignite, the programmer must:
- The manual fuel shut-off valves of an automatic oil-fired boiler must be opened
- The programmer will go through a post purge: