Disposing of a Non-Operating Reach-In Freezer
A supermarket is scrapping a reach-in freezer that uses a hermetic compressor and a nameplate charge of 4.8 lb of R-134a. The freezer has been unplugged for three weeks, and the compressor will not start. The technician connects gauges and reads 12 psig on the suction side and 40 psig on the high side at ambient temperature. The technician has two recovery devices available: a system-dependent recovery unit that uses the appliance’s compressor to push refrigerant, and a self-contained recovery machine with its own compressor. The store manager wants to cut the refrigerant lines and send the freezer to the scrapyard because “the refrigerant is basically gone.” The technician must recover the refrigerant before disposal and must decide which equipment to use and to what level. The freezer is a small appliance under Section 608. The technician also needs to document the disposal.
1. Which recovery device is appropriate, and why?
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The self-contained recovery machine is required. A system-dependent recovery device relies on the appliance’s compressor to move refrigerant, but this freezer’s compressor will not start. Using system-dependent equipment on a non-operating appliance would not recover the refrigerant effectively and could result in venting. The self-contained machine has its own compressor and can pull refrigerant from the non-operating freezer. The technician should also use a DOT-approved recovery cylinder and follow the 80% fill rule.
2. What recovery level must the technician achieve before disposal, and how does the non-operating compressor affect that requirement?
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For a small appliance being disposed of, the technician must recover at least 90% of the refrigerant charge when using self-contained recovery equipment, or achieve the applicable vacuum standard if the system can be evacuated further. Because the compressor is not operating, the technician cannot rely on the appliance to help; the self-contained machine must do the work. The technician should weigh the recovered refrigerant or use a scale to verify the amount. If the system cannot be evacuated to the required level, the technician must document why and follow disposal rules. Cutting the lines without recovery would violate the venting prohibition.
3. What should the technician tell the store manager about cutting the lines?
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The technician should explain that cutting the lines would release R-134a, an HFC substitute covered by the Section 608 venting prohibition. The manager’s belief that the refrigerant is “basically gone” is incorrect because the gauges show positive pressure. The technician must recover the remaining refrigerant before disposal, and the appliance should not be scrapped until recovery is complete. The technician should provide a recovery record and explain that improper disposal can lead to penalties. The manager cannot authorize venting.