Direct Expansion Air Conditioning MCQ with Answers

29) What is the cause of oil foaming in compressor crankcase at the time of starting?

Answer is:

Defective oil heater/circuit

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Related Direct Expansion Air Conditioning MCQ with Answers

30) Why the LP cut out control is bypassed electrically before pump down operation?

Answer is:

To lower the suction pressure close to 0.5 kg/cm²

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