Hydrocarbon Refrigerants Training Presented by Refrigeration Service Engineers Society Topics to Cover 1. 2. 3. 4. 5. 6. Uses of Hydrocarbons as Refrigerants HC Regulations and Standards Refrigerant Properties and Safety The Refrigerant Cycle System Components Servicing Procedures History of Hydrocarbons as Refrigerants • 1900’s - HCs used in infancy of the refrigeration industry; • 1930’s - CFCs developed (non-flammable), HC use reduces; • 1970’s - Ozone depletions by CFCs discovered; • 1980 - HFC and HC start to replace CFCs; • 2000 - Launch of HC ice cream cabinets; • 2005 - Over 50,000 HC cabinets in use in Europe. R-290-Propane R-600a-Isobutane R-441A-Flammable blend Must follow recommended safety practices when working with these approved flammable refrigerants Why use Flammable Refrigerants? The Montreal Protocol Reduces CFC and HCFC Production Low Global Warming Potentials (GWP) Less than 3 EPA Approves Use of HCs through the Significant New Alternatives Policy (SNAP) Zero Ozone Depleting Potential (ODP) Technician servicing procedures need to change with the introduction of flammable refrigerants • HCs already used worldwide; • Over 80 million domestic refrigerators in use worldwide; • HCs also used in commercial appliances-bottle coolers, chest freezers, commercial refrigerators; • Also used in split system and portable AC systems in use, however not yet approved in USA Applications and Limits R-290-Propane R-600a-Isobutane R-441A-Flammable blend • R-600a and R-441A – New Household Refrigerators and Refrigerator/Freezers-57 grams (2.0 ounces) Equipment Constructed following UL250-Current Edition • R-290 – New Retail Food Refrigerators Freezers-150 grams (5.3 ounces) Equipment Constructed following UL471-Current Edition Understanding HC Regulations Common Regulator Agencies EPA CSA ISO ASHRAE NFPA EC IEC UL Ultimately the technician is responsible for knowing the local regulations Keeping Up with Regulations http://www.epa.gov/ozone/snap/regulations.html Unauthorized Applications • HCs allowed for use in only new systems under the SNAP approved program; • NO RETROFITTING allowed in the USA (retrofitting is allowed in other countries). Unauthorized Refrigerants • • • Before servicing equipment look for MATCHING refrigerants equipment labels (the unit and compressor) If the compressor and refrigerant match then it should be acceptable to service the system If the labels do not match assume the system has been retrofitted and – STOP work on this system immediately – Contact the owner – Inform owner of system violations – Refuse to service – Offer to replace system with approved systems EPA Further Information Statement • Be an qualified refrigeration technician; • Be familiar with the safety precautions for flammable refrigerants; • Be familiar with the information provided by other sources, such as the manufacturers of the system equipment, component manufacturers, and refrigerant suppliers. Identification Labeling • Compressors and systems will have labels identifying the type of flammable refrigerant. • UL 250 and 471 require labeling as part of the SNAP approval Further Labeling Requirements Evaporator Labeling Requirements "DANGER- Risk of Fire or Explosion. Flammable Refrigerant Used. Do Not Use Mechanical Devices To Defrost Refrigerator. Do Not Puncture Refrigerant Tubing." Labeling attach on or near any evaporators Further Labeling Requirements Machine/Compressor Labeling Requirements "DANGER- Risk of Fire or Explosion. Flammable Refrigerant Used. To Be Repaired Only By Trained Service Personnel. Do Not Puncture Refrigerant Tubing." “CAUTION- Risk of Fire or Explosion. Flammable Refrigerant Used. Consult Repair Manual/Owner’s Guide Before Attempting To Service This Product. All Safety Precautions Must be Followed." Attach near the machine/compressor compartment Further Labeling Requirements Exterior Labeling Requirements “CAUTION- Risk of Fire or Explosion. Dispose of Properly In Accordance With Federal Or Local Regulations. Flammable Refrigerant Used." Attach on the exterior of the refrigerator Further Labeling Requirements Near Refrigerant Tubing Labeling Requirements “CAUTION- Risk of Fire or Explosion Due To Puncture Of Refrigerant Tubing; Follow Handling Instructions Carefully. Flammable Refrigerant Used." Attach near any and all exposed refrigerant tubing Further Labeling Requirements Letter Sizing “CAUTION- Risk of Fire or Explosion Due To Puncture Of Refrigerant Tubing; Follow Handling Instructions Carefully. Flammable Refrigerant Used." All of these markings shall be in letters NO LESS than 6.4 mm (1/4”) high. Further Labeling Requirements Service Access &Tubing Painting • • • The refrigerator or freezer must have red, Pantone® Matching System (PMS) #185 marked pipes, and other devices through which the refrigerant is serviced, such as any service port; This color must be present at all service ports and where service puncturing or otherwise creating an opening from the refrigerant circuit to the atmosphere might be expected (e.g., process tubes). The color mark must extend at least 2.5 centimeters (1”) from the compressor and must be replaced if removed, repaint if necessary Liability • Working with any refrigerant carries a certain liability • Check with your insurance carrier before with HC refrigerants ASHRAE Refrigerant Ratings Increasing Flammability SAFETY GROUP Higher Flammability Lower Flammability No Flame Propagation A3 A2 A2L* A1 B3 B2 B2L* B1 Lower Toxicity Higher Toxicity Increasing Toxicity A2L and B2L are lower flammability refrigerants See ASHRAE Standard 34 for full Details Refrigerant Safety Group Classification Flammability and Ignition Sudden release of refrigerant can result in proper concentrations for: Flash Fire • Sustained Fire • Explosion Ignition Sources • Temperatures greater than 460°C or 860°F; • Flame from a match; • Torch including halide leak detectors. Ignition Sources Electric sparks from: • • • • • • • • • Light and Socket Switches Unsealed Relays and Overloads On Off switches Contactors Pressure Switches Defrost Timers Thermostats Vacuum Pump Switches Electronic Leak Detectors Upper and Lower Explosive (Flame) Limits LEL -Lower Explosive Limits R290-2.1% R600a-1.8% UEL-Upper Explosive Limit R-290-9.5% R600a-8.5% MSDS Material Safety Data Sheets • Required to be availability to all employees • Also required to be available to local Fire Departments CHECK WITH THE AUTHORITY HAVING JURISDICATION (AHJ) FOR LOCAL REGULATIONS Cylinder Safety • • • • • • • Never store or expose to temperatures above 125°F (52°C); Never apply open flame; Never heat with water or heat blanket above 110°F (43°C); Never refill single trip cylinders; Never exceed refillable limits; Never remove labels; Never smoke near flammable refrigerant cylinders. Cylinder Transport • Department of Transportation Division 2.1 Classification-Flammable Gas – Transport in upright position – Label vehicle as carrying flammable gas – Inventory vehicle contents • Some jurisdictions require – Storage in explosive proof cabinets – Venting of cabinet to exterior Check the local Authority Having Jurisdiction Cylinder Storage • • • • Store in a locked cage; Store at ground level; Store away from air intakes; Keep ignition sources away from area; • Limit access; • Install combustible gas monitors. Check the local Authority Having Jurisdiction Brazing Requirements • • • • • • Recover refrigerant; Ventilate the area; Wear personal protection equipment (PPE); Check brazing equipment for leaks and proper pressure settings; Purge with inert gas while brazing (Nitrogen); Only trained and qualified personal should be brazing. Rated Equipment • • Flammable gas leak detectors and monitors; Personal safety monitors. Confined Space All refrigerants in confined space have inherent dangers. Remember to: • Use a combustible gas detector and /or monitor • Ventilate area and clear the area of any potential LEL or UE; • Eliminate alll sources of ignition Refrigerant Cycle Basic cycle is the same as it is for CFCs, HCFCs, & HFCs Refrigerant Cycle What is different • Additional safety requirements • Monitor area and prevent possible ignition sources • Ventilate area when required • Using tubing cutting to remove refrigeration components – do not use a torch Refrigerant Cycle Generally Same Components Used Condenser Evaporator Metering Device Lubricants Gaskets, Seals, O-rings Always Use Approval Components When Replacing Servicing Procedures • • Use only spark proof equipment-like a brass screwdriver, Use non-ignitable type detectors such as UV additive, liquid detection solution, electronic leak detectors for flammable gasses or ultra sonic leak detectors Servicing Procedures • • • Use standard evacuation and pressure testing procedures Use standard recovery methods Use standard charging methods (weigh in)
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