When pumping down an air conditioning system...

Question 1 of 2707066636eee28f7522a1c51f063

When pumping down an air conditioning system to test the low-pressure cutout switch, assuming that the compressor is running, what should be done to initiate the test?

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Question 1 of 27070

When pumping down an air conditioning system to test the low-pressure cutout switch, assuming that the compressor is running, what should be done to initiate the test?

🔍 Key Concepts

• Low-pressure cutout switch function and what condition causes it to trip • What happens to suction (low-side) pressure when the refrigerant flow to the evaporator is reduced or stopped • Normal roles of the compressor, condenser, circulating pump, and king valve in a refrigeration/AC system

💭 Think About

• Which action will cause the suction (low-side) pressure to drop while the compressor continues running? • Which option affects the refrigerant flow on the low side of the system rather than stopping the compressor or heat rejection? • If you want to test a pressure switch, do you change electrical components or do you change the system pressure it senses?

✅ Before You Answer

• Identify which component directly controls or isolates refrigerant flow to part of the system • Eliminate any choice that would stop the compressor or completely shut down the system, because the compressor must be running during the test • Consider which choice would most effectively cause the suction pressure to fall low enough to trip the low-pressure cutout