Maintenance, Servicing, and Safety in .NET

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Maintenance, Servicing, and Safety
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When flushing or purging a contaminated system, care must be taken to protect the eyes and skin from contact with acid-saturated refrigerant or oil mists The eyes should be protected with goggles All parts of the body should be protected by clothing to prevent injury by refrigerant If contact with either skin or eyes occurs, flush the exposed area with cold water Apply an ice pack if the burn is severe, and see a physician at once
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R-12 refrigerants have effectively been replaced in modern air-conditioning equipment with R-134a or any of the other approved substitutes, and R-22 has some acceptable substitutes also They are considered to be nontoxic and noninflammable However, any gas under pressure can be hazardous The latent energy in the pressure alone can cause damage In working with R-12 and R-22 (or their substitutes), observe the same precautions that apply when working with other pressurized gases Never completely fill any refrigerant-gas cylinder with liquid Never fill more than 80 percent with liquid This will allow for expansion under normal conditions Make sure an area is properly ventilated before purging or evacuating a system that uses R-12, R-22, or their equivalents In certain concentrations and in the presence of an open flame such as a gas range or a gas water heater, R-12 and R-22 may break down and form a small amount of harmful phosgene gas This poison gas was used in World War I
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Lifting heavy objects can cause serious problems Strains and sprains are often caused by improper lifting methods To avoid injury, learn to lift the safe way Bend your knees, keep your back erect, and lift gradually with your leg muscles The material you are lifting may slip from your hands and injure your feet To prevent foot injuries, wear the proper shoes
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Many Tecumseh single-phase compressors are installed in systems requiring off-cycle crankcase heating This is designed to prevent refrigerant accumulation in the compressor housing The power is on at all times Even if the compressor is not running, power is applied to the compressor housing where the heating element is located Another popular system uses a run capacitor that is always connected to the compressor motor windings, even when the compressor is not running Other devices are energized when the compressor is not running That means there is electrical power applied to the unit even when the compressor is not running This calls for an awareness of the situation and the proper safety procedures Be safe Before you attempt to service any refrigeration system, make sure that the main circuit breaker is open and all power is off
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SERVICING THE REFRIGERATOR SECTION The refrigerant cycle is a continuous cycle, which occurs whenever the compressor is operating Liquid refrigerant is evaporated in the evaporator by the heat that enters the cabinet through the insulated walls and by product load and door openings The refrigerant vapor passes from the evaporator through the suction line to the compressor dome, which is at suction pressure From the top interior of the dome, the vapor passes down through a tube into the pump cylinder The pressure and temperature of the vapor are raised
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in the cylinder by compression The vapor is then forced through the discharge valve into the discharge line and the condenser Air passing over the condenser surface removes heat from the high-pressure vapor, which then condenses to a liquid The liquid refrigerant flows from the condenser to the evaporator through the small-diameter liquid line (capillary tube) Before it enters the evaporator, it is subcooled in the heat exchanger by the low-temperature suction vapor in the suction line
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