Question 28Refrigeration & AC - QMED

The correct answer is C) several minutes after shutdown following a prolonged period of operation. The most accurate oil level reading for a refrigeration compressor will be obtained after the compressor has been shut down for several minutes following a prolonged period of operation. This is because the oil will have had time to fully drain back into the crankcase, providing a true indication of the oil level. Options A and B are incorrect because the oil level will not have stabilized immediately after start-up or after a 3-hour shutdown. Option D is incorrect because adding oil will obviously affect the reading and not provide an accurate baseline.