While securing the air conditioning...

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Question 1 of 2066636eee28f7522a1c51f2a2

While securing the air conditioning compressor you close the suction valve and the compressor stops after a short period of time. Subsequent attempts to start it produce no result. What control component would you suspect is preventing the compressor from starting?

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Question 1 of 20

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🔍 Key Concepts

• Refrigeration/AC compressor protection controls and what each one monitors • Effect of closing the suction (inlet) valve on the compressor’s suction pressure • Difference between pressure cutout switches and flow/temperature control devices

💭 Think About

• When you close the suction valve, what happens to the pressure on the low side of the system while the compressor runs briefly? • Which of the listed controls is specifically designed to prevent compressor damage when suction conditions become abnormal (too low or too high)? • Which option is a safety shutdown device versus a regulating/control device that modulates normal operation?

✅ Before You Answer

• Identify which devices are true safety cutout switches (they open the control circuit to stop starting/running). • Decide which cutout is directly affected by suction (low-side) pressure rather than discharge pressure, lube oil pressure, or cooling water flow. • Confirm that the suspected device would both stop the compressor and then prevent it from restarting until pressure returns to normal or the switch is reset.

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