The test used to extinguish the pilot is called which of the following?

The test used to extinguish the pilot is called which of the following?

• A. Purge
• B. Vent test
• C. Drop out
• D. Pilot blow

Answer: (C)

Extinguishing the pilot and ensuring the safety control responds is described by a drop out test. The idea is to simulate the pilot going out and verify that the flame-sensing safety shuts the gas valve off. When the pilot flame is lost, the thermocouple or flame sensor stops sending current, causing the valve to drop out and seal, preventing any further gas flow. This protects against gas buildup if the flame goes out. Purge tests are used to clear gas from lines before ignition, vent tests check the exhaust/venting, and “pilot blow” isn’t a standard term. So the drop out test is the appropriate description for testing the action that extinguishes the pilot and stops gas flow.

Extinguishing the pilot and ensuring the safety control responds is described by a drop out test. The idea is to simulate the pilot going out and verify that the flame-sensing safety shuts the gas valve off. When the pilot flame is lost, the thermocouple or flame sensor stops sending current, causing the valve to drop out and seal, preventing any further gas flow. This protects against gas buildup if the flame goes out.

Purge tests are used to clear gas from lines before ignition, vent tests check the exhaust/venting, and “pilot blow” isn’t a standard term. So the drop out test is the appropriate description for testing the action that extinguishes the pilot and stops gas flow.