EPA 608 Universal common mistakes
EPA 608 Universal · Understand the traps and how to avoid them.
Uses the same recovery cylinder for whatever refrigerant is recovered and does not label the cylinder with the refrigerant name before starting.
Recovery is rushed, cylinders look identical, and the technician assumes mixing small amounts is acceptable.
What to do instead
Use a dedicated, DOT-approved recovery cylinder for each refrigerant; label the cylinder with the refrigerant type and date before recovery; never mix refrigerants.
Stops recovery as soon as the system gauge reads 0 psig and declares the appliance empty.
The technician confuses no positive pressure with no refrigerant remaining; vapor can still be in the system at atmospheric pressure.
What to do instead
Follow the required recovery/evacuation level for the appliance category and refrigerant, and continue with the recovery machine until that level is reached, not just 0 psig.
Applies familiar high-pressure recovery rules to a low-pressure chiller and pulls it down only to 0 psig.
Low-pressure equipment operates differently and the technician uses the procedure learned for high-pressure systems.
What to do instead
Use Type III low-pressure procedures and equipment; recover to the required deep vacuum level for low-pressure appliances, such as 25 in Hg where applicable.
Uses a recovery machine or cylinder without checking that it is rated for the refrigerant and pressure involved.
The technician assumes all recovery equipment is universal, but very high-pressure refrigerants such as R-410A require higher-rated equipment.
What to do instead
Verify the recovery machine, hoses, and DOT recovery cylinder are rated for the specific refrigerant and pressure; use a scale and appropriate cylinder.
Vents refrigerant from a small appliance such as a household refrigerator or window unit because the charge is small.
The technician believes a small charge is exempt or harmless and does not treat it as regulated refrigerant.
What to do instead
Recover the refrigerant with certified small-appliance recovery equipment; intentional venting is prohibited regardless of charge size.
Overfills a recovery cylinder by filling it until it feels full or by volume rather than by weight.
Liquid refrigerant expands, and the technician ignores the cylinder fill limit or does not use a scale.
What to do instead
Weigh the recovery cylinder during filling and stop at no more than 80% of its capacity by weight.
Pressure-tests a refrigerant system with oxygen or compressed air.
Oxygen or air is readily available and seems like a convenient dry gas, but the technician does not recognize the ignition and contamination hazards.
What to do instead
Use dry nitrogen with a pressure regulator for pressure testing; never use oxygen or compressed air in a refrigerant system.
Confuses recovery, recycling, and reclaiming, such as calling refrigerant cleaned on site 'reclaimed.'
The terms sound similar and the technician has not memorized the regulatory definitions.
What to do instead
Remember: recovery means removing refrigerant; recycling means cleaning it for reuse on site; reclaiming means reprocessing to new-product specification by an EPA-certified reclaimer.
Adds refrigerant to a low-pressure chiller to fix low suction without checking the purge unit or finding the leak.
Low-pressure systems run in vacuum and can draw in air and moisture; the technician misreads low performance as simply low charge.
What to do instead
Leak-check the chiller, verify purge unit operation, check for air/moisture in the refrigerant, and repair the leak before charging.
Identifies refrigerant by gauge pressure alone and charges a system with the assumed refrigerant.
Pressure changes with temperature, and blends or mixed refrigerants make pressure-only identification unreliable.
What to do instead
Use the equipment nameplate, a refrigerant identifier, and a pressure-temperature chart with a measured temperature; never guess the refrigerant.