What initiates the rupture of the frangible disk in the Freon bottle system?

• A. A manual trigger.
• B. A thermostat.
• C. An electrical signal that fires an explosive squib.
• D. A mechanical timer.

Answer: (C)

The release mechanism is designed for a fast, reliable vent of the pressurized Freon only when commanded. A small explosive charge called a squib is seated in the bottle neck behind the frangible disk. When an electrical signal from the fire or release control is sent, the squib detonates and punctures the disk, opening the path for the high-pressure Freon to discharge. This setup provides an instantaneous, controlled rupture that’s independent of temperature, manual actions, or timed delays, which is why an electrical signal triggering an explosive squib is the right method. Manual triggers, thermostats, and mechanical timers wouldn’t offer the same reliability or immediacy in an emergency release.