BAP Combustion & Mechanical Systems Flashcards

What is the primary purpose of a combustion analyzer in a building analyst's assessment?

Answer: To measure flue gas composition and efficiency of combustion appliances

A combustion analyzer measures flue gas constituents such as O2, CO, and CO2 to calculate appliance efficiency and identify unsafe combustion conditions.

Which condition most commonly causes a gas furnace to produce elevated carbon monoxide (CO) levels?

Answer: Incomplete combustion due to improper air-to-fuel ratio

Incomplete combustion, often caused by insufficient combustion air or a cracked heat exchanger, is the primary source of elevated CO in gas furnaces.

What does a steady CO reading of 400 ppm in a furnace's flue gases indicate to a BAP analyst?

Answer: A potentially hazardous combustion problem requiring immediate action

400 ppm CO in flue gases signals seriously incomplete combustion; BPI standards require the analyst to shut down the appliance and notify the client.

What is the purpose of a spillage test on a naturally drafted combustion appliance?

Answer: To confirm combustion gases are venting properly and not spilling into the living space

A spillage test, typically performed with a smoke pencil or mirror, confirms that flue gases draft correctly up the vent rather than spilling into conditioned space.

Which test is used to determine whether a combustion appliance zone (CAZ) has enough air for safe combustion and venting?

Answer: Blower door depressurization of the CAZ

A CAZ depressurization test uses a blower door to simulate worst-case house pressures and determine if backdrafting of combustion appliances can occur.

What is the BPI maximum allowable ambient CO level in a combustion appliance zone before work should stop?

Answer: 35 ppm

BPI protocols require analysts to stop work and evacuate if ambient CO in the CAZ reaches or exceeds 35 ppm, following OSHA/EPA safety thresholds.