Question 41Refrigeration/AC - 1st Asst/Chief70% to pass
The most cost-effective method of recovering refrigerant from a low-pressure chiller with more than 500 lbs of refrigerant and to meet EPA requirements is to recover the refrigerant using what protocol?
AI Explanation
The correct answer is D) liquid recovery using a liquid pump, followed by vapor recovery using a vacuum pump based recovery unit.
The EPA requires that refrigerants be recovered using a combination of liquid and vapor recovery methods to ensure complete recovery and to meet environmental regulations. For a low-pressure chiller with more than 500 lbs of refrigerant, using a liquid pump for the initial liquid recovery, followed by a vacuum pump based vapor recovery unit, is the most cost-effective method to fully recover the refrigerant and comply with EPA requirements.
The other options are less effective or do not fully meet the EPA regulations. Option A, using only a vapor recovery machine, may not be sufficient to recover all the liquid refrigerant. Option B, using a vapor recovery unit followed by a liquid pump, is less efficient than the recommended approach. Option C, using only a liquid pump, would not recover the vapor portion of the refrigerant, which is also required.
Related Questions
#39 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? #40 If a refrigeration system were short of refrigerant, besides an elevated box temperature, what would be an observable symptom? #42 Why is a purge recovery unit typically fitted on low pressure centrifugal chillers? #43 Minor repairs may be performed on low-pressure refrigerant systems without recovering the refrigerant charge if the pressure in the system is raised to atmospheric. How may this be accomplished? #44 What is the wet bulb temperature of air if the dry bulb temperature of the air is 90 degrees and the relative humidity is 65%? Illustration GS-RA-22