FSD FSD Troubleshooting & Repair 1 — Questions and Answers
Question 1: What is the most common cause of fire damper failure during an inspection?
- Corroded or seized blades preventing full closure (Correct answer)
- Oversized ductwork dimensions
- Excessive airflow velocity
- Improper thermostat calibration
Correct answer: Corroded or seized blades preventing full closure
Corrosion or seized blades are the leading cause of fire damper failure, preventing the damper from fully closing when activated.
Question 2: When a smoke damper fails to close upon activation signal, what should be checked first?
- The actuator and its power supply connection (Correct answer)
- The ductwork insulation
- The building's main circuit breaker
- The HVAC filter condition
Correct answer: The actuator and its power supply connection
The actuator and its power supply should be checked first since a failed or unpowered actuator is the most direct cause of a smoke damper not responding to a closure signal.
Question 3: A bent or damaged blade on a fire damper most commonly indicates what condition?
- Previous improper access or mechanical impact during maintenance (Correct answer)
- Normal thermal expansion over time
- Manufacturer defect in the blade alloy
- Over-pressurization of the supply duct
Correct answer: Previous improper access or mechanical impact during maintenance
Bent blades typically result from technicians forcing the damper open during maintenance without proper tools, or from physical impact during construction activities.
Question 4: If a fusible link has activated but the damper still did not close, what is the most likely cause?
- The damper blades are seized due to corrosion or debris (Correct answer)
- The fusible link was the wrong temperature rating
- The duct was under negative pressure
- The fire alarm panel was not notified
Correct answer: The damper blades are seized due to corrosion or debris
When the fusible link releases but the damper remains open, seized blades from corrosion or debris accumulation are the most likely obstruction preventing closure.
Question 5: What is the correct action when a damper is found stuck in the open position during inspection?
- Tag it as deficient, notify the building owner, and initiate corrective work (Correct answer)
- Manually force it closed and document the repair
- Leave it open until the next scheduled inspection cycle
- Install a temporary bypass duct around the damper
Correct answer: Tag it as deficient, notify the building owner, and initiate corrective work
A stuck-open damper must be tagged as a deficiency, the building owner notified, and a corrective action plan initiated to restore the damper to operational status.
Question 6: Which condition requires immediate replacement of a fire damper rather than repair?
- Cracks or holes in the damper frame that compromise the fire-rated assembly (Correct answer)
- Minor surface rust on the exterior of the frame
- A missing access door label
- Slightly stiff blade operation that resets manually
Correct answer: Cracks or holes in the damper frame that compromise the fire-rated assembly
Cracks or holes in the damper frame compromise the fire-rated integrity of the assembly and cannot be field-repaired — the damper must be replaced.
FSD FSD Troubleshooting & Repair 1
What is the most common cause of fire damper failure during an inspection?