Which of the following is a function of the switch located on the high-pressure side of an A/C system?

Prepare for the HVAC 403A Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which of the following is a function of the switch located on the high-pressure side of an A/C system?

The high-pressure side switch acts as a safety device that watches the refrigerant pressure after the condenser. If pressure climbs too high, it opens its contacts and stops the compressor (often by de-energizing the compressor clutch). This protects the compressor and the rest of the system from damage due to overpressure. That’s why the correct description is the high-pressure compressor cut out. The other options don’t fit because they describe functions unrelated to this safety switch: protecting the system from high pressure, controlling evaporator airflow or exterior conditions, or limiting engine speed.

The high-pressure side switch acts as a safety device that watches the refrigerant pressure after the condenser. If pressure climbs too high, it opens its contacts and stops the compressor (often by de-energizing the compressor clutch). This protects the compressor and the rest of the system from damage due to overpressure.

That’s why the correct description is the high-pressure compressor cut out. The other options don’t fit because they describe functions unrelated to this safety switch: protecting the system from high pressure, controlling evaporator airflow or exterior conditions, or limiting engine speed.

More practice questions