CFAA Fire Alarm Technician · Question
Why is 'Fan Shutdown' a critical sequence of operation to verify?
ULC-S524 and S537 require that fan shutdown for HVAC units over a certain capacity must be confirmed. The verification ensures the relay physically breaks the f
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Question: Why is 'Fan Shutdown' a critical sequence of operation to verify?
Answer options:
- To prevent the smoke from being cleaned by the HVAC filters
- To save energy during a fire emergency ✅ To prevent the movement of smoke and air to unaffected areas
- To ensure the building becomes airtight for fire suppression
Correct answer: To prevent the movement of smoke and air to unaffected areas
Explanation: ULC-S524 and S537 require that fan shutdown for HVAC units over a certain capacity must be confirmed. The verification ensures the relay physically breaks the fan motor circuit or its control.
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Question explanations
- The primary power for a fire alarm system must be:
- If a 120VAC primary power circuit for a fire alarm control unit is consuming 60 Watts of power, what is the cu
- In a steady-state DC circuit, if the conductor length is doubled while maintaining voltage and wire gauge, wha
- A resistor is rated at 10 Watts at 24VDC. If the voltage drops to 20VDC, what is the new power dissipation?
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