Heating, Ventilation, and Air Conditioning (HVAC ) Electrical Practice Test

Which diagram represents the symbol for a pressure switch?

1. A

2. B

3. C

4. D

The correct answer is: C

The symbol for a pressure switch in HVAC systems is represented by a diagram that typically features a representation of a mechanical switch mechanism influenced by the pressure of a fluid or gas. This switch is designed to open or close its contacts based on the pressure level it detects. The correct answer is often characterized by features that illustrate connection points for wires, as well as notation indicating the pressure sensing element. The visual representation may include a diaphragm or a similar component, signifying how the switch operates in response to pressure changes within the system. For a clearer understanding, consider that other diagrams may depict different components or switch types, such as temperature sensors or general electrical switches, which would not effectively convey the specific function of a pressure switch. The focus on pressure activation in the selected diagram helps students differentiate this component from others used in HVAC applications.