New York Low Pressure Boiler Certificate of Fitness (COF) Practice Test

What types of controls may be installed with tight closing dampers?

1. Pressure and temperature controls

2. Automatic fan and emergency controls

3. Draft and combustion controls

4. Flow and heat controls

The correct answer is: Draft and combustion controls

Tight closing dampers are integral components in the control of airflow and combustion within heating systems, particularly in low pressure boilers. The option indicating draft and combustion controls directly relates to the function of tight closing dampers. These dampers are designed to regulate the flow of flue gases and air, which is critical for maintaining the right conditions for combustion. By controlling the draft, they help to ensure that the fire receives enough air for optimal combustion and to maintain safety by preventing backdrafts or excessive air intrusion. Draft controls help manage the balance of air entering the combustion chamber, which can greatly affect the efficiency and safety of the system. Similarly, combustion controls monitor and adjust the fuel-air mixture to ensure complete combustion, reduce emissions, and optimize performance. Other types of controls, such as pressure, temperature, flow, and heat, while important in their contexts, do not directly facilitate the primary function of tight closing dampers in managing combustion-related processes. By focusing on draft and combustion controls, one can understand how tight closing dampers play a critical role in efficient and safe boiler operation.