We appreciate your visit to If you are using a recovery machine manufactured after 11 15 93 you must evacuate a low pressure appliance to before making a major repair. This page offers clear insights and highlights the essential aspects of the topic. Our goal is to provide a helpful and engaging learning experience. Explore the content and find the answers you need!
Answer :
Final answer:
For major repairs on low-pressure appliances, using a recovery machine manufactured after 11-15-93, the refrigerant must be evacuated to 0 psig, aligning with EPA regulations calling for as complete a vacuum as possible.
Explanation:
The query relates to the standards for servicing HVAC systems, specifically regarding the proper evacuation levels of refrigerants from low-pressure appliances before performing major repairs. According to Section 608 of the Clean Air Act and the Environmental Protection Agency (EPA) regulations, when using a recovery machine manufactured after November 15, 1993, the technician must evacuate a low-pressure appliance to 25 microns (equivalent to 0.033 psig) of mercury vacuum or below for repairs involving the removal of the appliance component containing refrigerant. However, since none of the provided options include 0.033 psig or 25 microns of mercury vacuum, the best-fit answer from the given choices that falls in line with the intent of the regulations is 0 psig, as it is closest to the actual required evacuation level and implies that the refrigerant pressure within the system has been reduced to a level as close to a complete vacuum as possible. Note that service practices are subject to change, and it is essential to consult the most current EPA regulations and practices when servicing HVAC equipment.
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