Handling of Refrigerant Lines and Fittings
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Handling of Refrigerant Lines and Fittings
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Warning
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To avoid system damage use only R-134a dedicated tools when servicing the A/C system.
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Keep all metal tubing lines free of dents or kinks. Any line restrictions will cause the loss of system capacity.
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Never bend a flexible hose line to a radius of less than four times the diameter of the hose.
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Never allow a flexible hose line to come within 65 mm (2-1/2 in) of the exhaust manifold.
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Inspect flexible hose lines regularly for leaks or brittleness.
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Replace flexible hose lines with new lines if you find signs of deterioration or leaking.
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Discharge the refrigeration system of all refrigerant before disconnecting any fitting in the refrigeration system.
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Proceed very cautiously regardless of the gauge readings.
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Warning
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For personal protection, goggles and lint-free gloves should be worn and a clean cloth wrapped around fittings, valves, and connections when doing work that includes opening the refrigerant system. If refrigerant comes in contact with any part of the body severe frostbite and personal injury can result. The exposed area should be flushed immediately with cold water and prompt medical help should be obtained.
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Open the fittings very slowly.
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If you notice pressure when you loosen a fitting, allow the pressure to bleed off as described Discharging, Adding Oil, Evacuating, and Charging Procedures for A/C System .
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Cap or tape any refrigerant line immediately after it is opened. This will prevent the entrance of moisture and dirt, which can cause internal compressor wear or plugged lines in the condenser, the evaporator core, the expansion valve, or the compressor inlet screens.
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Note
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Use two proper wrenches to connect the fittings.
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Back up the opposing fitting to prevent distortion of the connecting lines or the components.
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Keep the sealing surfaces in perfect condition. A burr or a piece of dirt may cause a refrigerant leak.
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When seal washers are used, always install the seal washer without lubrication.
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When O-rings are used, always lightly coat the new O-ring seal with mineral base 525 viscosity refrigerant oil prior to installation.
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