Massachusetts Oil Burner License Practice Test

What minimum temperature difference is recommended between the high and low limit on a triple acting aquastat?

1. 10 degrees

2. 15 degrees

3. 20 degrees

4. 25 degrees

The correct answer is: 20 degrees

The recommended minimum temperature difference between the high and low limit on a triple acting aquastat is 20 degrees. This temperature differential is crucial for the efficient operation of heating systems, allowing the system to cycle appropriately without unnecessary wear on components. A 20-degree difference helps to maintain consistent operation while preventing short cycling, which can occur if the limits are set too close together. This short cycling can lead to higher energy consumption and can stress the system, leading to more frequent repairs or replacements. By setting the aquastat with this differential, the heating system can effectively manage water temperatures, ensuring that the boiler or burner operates within optimal ranges. The other values, while representing possible differentials, do not provide the same stability and efficiency required for a reliable heating system. Therefore, 20 degrees stands out as the best practice in maintaining both efficiency and equipment longevity.