Red Seal Gasfitter — Class B Practice Exam

What is the purpose of an altitude compensation system in gas appliances?

1. To increase gas flow

2. To determine pressure levels

3. To adjust for low oxygen levels

4. To enhance flame brightness

The correct answer is: To adjust for low oxygen levels

The altitude compensation system in gas appliances is designed to adjust the operation of the appliance based on changes in altitude. At higher altitudes, the ambient air pressure decreases, leading to a reduction in the availability of oxygen. This can affect combustion efficiency and the performance of gas appliances. By compensating for lower oxygen levels, the altitude compensation system ensures that the appliance operates safely and efficiently under varying elevation conditions. It adjusts the gas flow and combustion process to maintain optimal performance and prevent issues such as incomplete combustion, which could lead to increased emissions or hazardous situations like carbon monoxide production. In this context, the adjustment made by the altitude compensation system directly impacts the combustion process in relation to oxygen availability, which aligns with the choice related to low oxygen levels.