The pressure, in a low pressure...

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Question 1 of 205eccef9dbacbc34ba4d460fd

The pressure, in a low pressure refrigeration system about to be opened for a major repair, should be brought to what value before the system can be opened for repairs if the recovery unit was manufactured on or after Nov. 15, 1993?

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🔍 Key Concepts

• EPA refrigerant recovery requirements for low-pressure appliances • Definition of major repair and why a lower pressure is required before opening the system • Difference between psig (gauge pressure) and mm Hg absolute (very deep vacuum)

💭 Think About

• Which of these pressures would most effectively minimize refrigerant emissions when the system is opened? • For a low-pressure chiller, do EPA rules require you to recover refrigerant to a slight positive pressure, to atmospheric, or to a deep vacuum before opening for major repair with modern recovery equipment? • Think about why the standard for units manufactured on or after Nov. 15, 1993 might be more stringent than for older units—how would that affect the required final pressure?

✅ Before You Answer

• Identify which option represents a deep vacuum level rather than a positive pressure above atmospheric. • Confirm which standard in EPA recovery tables applies specifically to low-pressure appliances and major repair with recovery units made on or after Nov. 15, 1993. • Verify that the units in your choice (psig vs. mm Hg absolute) match what you’d expect for the stricter, newer recovery requirement.

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