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BLD-HVAC07-02 · Lesson 9 · 16 clock hours · lab

Refrigerant Recovery, Recycling, and Reclaim: EPA 608 Compliance in Practice

Objective. Students will operate an EPA-approved refrigerant recovery machine to recover refrigerant from a small system to EPA-required recovery levels, and complete the associated service documentation correctly.

Why Refrigerant Recovery Matters

Refrigerants released into the atmosphere deplete the ozone layer and contribute to climate change. Section 608 of the Clean Air Act makes it illegal to knowingly vent refrigerants during servicing, maintenance, repair, or disposal of refrigeration and air-conditioning equipment. The U.S. Environmental Protection Agency (EPA) enforces these rules, and any technician who purchases or handles refrigerants in bulk must hold EPA 608 certification. Understanding the recovery process is not optional — it is a legal requirement and a core competency of the trade.

Key Regulatory Concepts

Recovery means removing refrigerant from a system and storing it in an external container without necessarily testing or processing it. Recycling means cleaning recovered refrigerant for reuse on-site using oil separation and single or multiple passes through filter driers. Reclaim means processing refrigerant to the purity standard set by the Air-Conditioning, Heating, and Refrigeration Institute (AHRI 700) — reclaim can only be performed by an EPA-certified reclaimer, not in the field.

EPA Section 608 establishes required recovery efficiency levels based on the type of equipment and the refrigerant's ozone-depletion potential. The required end-point is expressed either as a vacuum level (inches of mercury gauge) or as a percentage of refrigerant removed, and the threshold varies with system size and refrigerant type. Always verify the current required recovery level for the specific equipment category on the EPA summary sheet provided before beginning work.

Equipment and Materials

Safety First

Before touching any equipment, review the Safety Data Sheet (SDS) for the refrigerant in the system. Apply these controls every time:

Step-by-Step Recovery Procedure

1. Check the recovery cylinder. Verify the cylinder is approved for the refrigerant type, confirm the retest date has not expired, and record the tare weight and current gross weight. Calculate available capacity before adding more refrigerant.

2. Weigh the cylinder. Place it on the scale and record the starting gross weight on your service log.

3. Leak-check connections. Connect the recovery machine to the system using properly rated hoses. After making connections, pressurize the hose set briefly and check fittings for leaks before opening the system valves.

4. Recover refrigerant. Open the system valves and start the recovery machine. Monitor the low-side gauge pressure and continue until the system reaches the required recovery level (vacuum depth or pressure specified for the equipment category).

5. Isolate and verify. Close the system valves, stop the machine, and wait the required observation period. If system pressure rises, residual refrigerant may still be present — continue recovery until the pressure stabilizes at or below the required level.

6. Weigh the cylinder again. Record the final gross weight on the service log. The difference between start and end weights is the mass of refrigerant recovered.

7. Label the cylinder. Mark the refrigerant type, cylinder ID number, and date. Never mix refrigerant types in one cylinder.

8. Complete the service log. Record the refrigerant type, start weight, end weight, cylinder ID, unit serviced, date, and your technician signature. A missing field is an incomplete record — correct it before submitting.

9. Disconnect and cap. Remove hoses, install valve caps on the cylinder, and store the cylinder upright in an approved location away from heat sources.

Documentation Requirements

Complete and accurate service records protect you legally and demonstrate professionalism. EPA regulations require records to be kept and made available for inspection. Your service log must show every field filled in with accurate data — estimating refrigerant weights is not acceptable. If a log has blank fields, it must be corrected before the job is considered complete.

Key terms8

RecoveryRemoving refrigerant from a system and storing it in an external container without testing or reprocessing it; required before opening any refrigerant circuit.
RecyclingCleaning recovered refrigerant for reuse on the same job site using oil separation and filter driers; performed in the field but does not meet reclaim purity standards.
ReclaimProcessing refrigerant to AHRI 700 purity standards; can only be performed by an EPA-certified reclaimer, not by field technicians.
DOT-approved recovery cylinderA pressure vessel that meets U.S. Department of Transportation standards for transporting recovered refrigerant; must be within its retest date and never filled above 80% of rated capacity.
Required recovery levelThe EPA-mandated end-point for refrigerant removal, expressed as a vacuum depth or system pressure, that varies by equipment type and refrigerant category.
Section 608 of the Clean Air ActThe federal law that prohibits knowing venting of refrigerants and requires EPA certification for technicians who handle refrigerants; enforced by the EPA.
Tare weightThe empty weight of a recovery cylinder; subtracted from gross weight to determine the net weight of refrigerant inside.
80% fill ruleThe maximum allowable fill level for a recovery cylinder — no more than 80% of its water capacity rating by weight — to leave room for liquid expansion and prevent rupture.

Worked examples4

1. A DOT-approved recovery cylinder has a tare weight of 8.6 lb and a gross weight of 14.2 lb at the start of the job. At the end of recovery the gross weight is 19.8 lb. How much refrigerant was recovered?
  1. Identify start gross weight: 14.2 lb
  2. Identify end gross weight: 19.8 lb
  3. Subtract start gross weight from end gross weight: 19.8 − 14.2 = 5.6 lb
Answer: 5.6 lb of refrigerant was recovered during this service event.
2. A recovery cylinder is rated with a water capacity of 30 lb. The refrigerant-specific filling factor for the refrigerant you are recovering is 0.80. The cylinder currently holds 8.4 lb net refrigerant. How many additional pounds of refrigerant can you legally add before reaching the 80% fill limit?
  1. Calculate the maximum allowable net fill: 30 lb × 0.80 = 24.0 lb
  2. Subtract the current net refrigerant weight from the maximum: 24.0 − 8.4 = 15.6 lb
Answer: You may add up to 15.6 lb more refrigerant before reaching the legal fill limit.
3. Before starting recovery, a technician weighs the recovery cylinder. The scale reads 22.5 lb gross. The tare weight stamped on the cylinder is 9.3 lb. What is the current net weight of refrigerant in the cylinder, and does this information need to be recorded on the service log before recovery begins?
  1. Subtract tare weight from gross weight: 22.5 − 9.3 = 13.2 lb net refrigerant currently in cylinder
  2. This starting gross weight (22.5 lb) must be recorded on the service log as the start weight before opening the system, so the amount added during this job can be calculated accurately.
Answer: The cylinder contains 13.2 lb of refrigerant. Yes, the starting gross weight must be entered on the service log before recovery begins.
4. After recovery, a technician's service log shows: start gross weight 22.5 lb, end gross weight 28.1 lb, tare weight 9.3 lb. What is the net weight of refrigerant now in the cylinder, and how much was recovered on this job?
  1. Calculate net refrigerant in cylinder after recovery: 28.1 − 9.3 = 18.8 lb
  2. Calculate amount recovered on this job: 28.1 − 22.5 = 5.6 lb
Answer: The cylinder now holds 18.8 lb net refrigerant; 5.6 lb was recovered during this service event.
In class: Pre-lab regulatory review: students read the core recovery requirements from an EPA Section 608 summary sheet and complete a short pre-lab quiz identifying required recovery levels for different system types. · Instructor demonstration of full recovery procedure on a charged training unit: setup, leak check of recovery cylinder, machine connection, recovery to required vacuum level, cylinder weighing, and cylinder labeling. · Student lab: in pairs, students recover refrigerant from an assigned charged training unit following a written procedure card, record start/end weights on a service log, label the recovery cylinder, and submit the completed log for review.
Materials: EPA-approved refrigerant recovery machines, recovery cylinders (DOT-approved, properly labeled), scale accurate to 0.1 lb, training refrigeration units pre-charged with R-410A or R-134a, EPA Section 608 summary sheet, service log forms, safety glasses, refrigerant-rated gloves, pre-lab quiz handout
Check: Service log must include correct start weight, end weight, refrigerant type, cylinder ID, and technician signature; any missing field is a fail requiring correction. Recovery machine operation is observed by instructor using a procedure checklist; student must complete all steps in correct order. Pass mark: complete and accurate log plus a clean procedure checklist.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.

EPA 608 — Core: Environmental Regulations
1. Under EPA Section 608 of the Clean Air Act, what does the term 'recovery' mean?
EPA 608 — Core: Environmental Regulations
2. Which action by a technician would violate EPA Section 608 regulations?
EPA 608 — Core: Safety and Handling
3. A technician fills a recovery cylinder beyond 80% of its water capacity rating. What is the primary hazard of this action?
EPA 608 — Core: Refrigerant Management
4. Which of the following personnel is permitted to reclaim refrigerant to AHRI 700 purity standards?
EPA 608 — Core: Refrigerant Management
5. A technician starts recovery with a cylinder gross weight of 15.4 lb and ends with a gross weight of 21.9 lb. How much refrigerant was recovered?
EPA 608 — Core: Safety and Handling
6. What is the correct minimum PPE when connecting hoses to a system charged with R-410A?
EPA 608 — Core: Recovery Techniques
7. After stopping the recovery machine, the technician observes that the system pressure rises back above the required recovery level during the observation period. What is the correct action?
HVAC Excellence — Professional Practices and Documentation
8. A service log is submitted with the refrigerant type, start weight, end weight, and cylinder ID filled in, but the technician's signature line is blank. According to the lab pass criteria, what happens next?
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