Maytag MFI2266AES Service Manual - Page 16

Service Procedures ! WARNING To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test procedures require power to be connected. Discharge capacitor through a 10,000 ohm resistor before attempting to service. Ensure all ground wires are connected before certifying unit as repaired and/or operational. HFC134a Service Information HFC134a is alternative refrigerant for CFC12. HFC134a has an ozone depletion potential (ODP) factor of 0.0 and a global warming potential (GWP) factor of 0.27. HFC134a is not flammable and has acceptable toxicity levels. HFC134a is not interchangeable with CFC12. There are significant differences between HFC134a and CFC12 which must be considered when handling and processing refrigeration system. Health, Safety, and Handling Health, safety and handling considerations for HFC134A are virtually no different than those for CFC12. Health, Safety, and CFC12 HFC134a Handling Allowable overall 1,000 ppm Same exposure limit Vapor exposure to skin No effect Same Liquid exposure to skin Can cause frostbite Same Vapor exposure to eye Very slight eye irritant Same Liquid exposure to eye Can cause frostbite Same Above minimum exposure Can cause Asphyxiation, Same limit Tachycardia, and Cardia Arrhythmias Safety and handling Wear appropriate skin Same and eye protection. Use with adequate ventilation. Spill management Remove or extinguish Same ignition or combustion sources. Evacuate or ventilate area. Fire explosion hazards May decompose if Same contact with flames and heating elements. Container may explode if heated due to resulting pressure rise. Combustion products are toxic. Disposal procedures Recycle or reclaim. Same ! CAUTION To minimize contamination, exercise extreme care when servicing HFC134A sealed systems. • No trace of other refrigerants is allowed in HFC134a systems. Chlorinated molecules in other refrigerants such as CFC12, etc. will lead to capillary tube plugging. • Ester oil is used in HFC134a systems. Do not use mineral oil. HFC134a and mineral oils cannot be mixed. If mineral oils were used in HFC134a systems, lubricant would not return to compressor and would cause early compressor failure. If significant amount of oil has been lost from compressor, replace oil rather than adding oil. • Ester oils used in HFC134a systems are so hydroscopic that by the time an inadequate system performance is detected, oil will be saturated with moisture. • CFC12 has much higher tolerance to system processing materials, such as drawing compounds, rust inhibitors, and cleaning compounds, than HFC134a. Such materials are not soluble in HFC134a systems. If materials were to be washed from system surfaces by ester oils, they could accumulate and eventually plug capillary tube. • Care must be taken to minimize moisture entering HFC134a system. Do not leave compressor or system open to atmosphere for more than 10 minutes. Excessive moisture in HFC134a system will react with compressor oil and generate acid. • Compressor must be replaced when performing low side leak repair. • Drier filter must always be replaced with service drier filter, part #B2150504. Important: Unbrazing drier filter from tubing will drive moisture from desiccant and into system, causing acids to form. Do not unbraze filter drier from tubing. If CFC12 service drier was installed in HFC134A system, drier could overload due to excessive moisture. • HFC134a compatible copper tubing, part #R0174075 (1/4" O.D. X 18" length) and part #R0174076 (5/16" O.D. X 24" length) must be used when replacing tubing. • Avoid system contamination by using Towerdraw E610 evaporating oil, part # R0157532, when flaring, swaging, or cutting refrigeration tubing. 16 16026312 ©2006 Maytag Services