Hence you will be able to see the insulation material being wrapped around the copper tubes for this purpose. In order to prevent the refrigerant from absorbing unnecessary heat from the ambient, the copper tube is insulated between the evaporator and the compressor at the low pressure side of the system. It is then filled with nitrogen gas before being capped. During production, these parts are cleaned and dehydrated to remove the moisture from the tube. Markings of ACR are done on the tubing to indicate that it is used for air conditioning and refrigeration purposes. The typical outer diameter ranges from 1/8 inch to 13⁄8 inch. The soft copper is flexible and comes in rolls of 25 feet or 50 feet. Type L outer diameters typically starts from 3/8 inch followed by 1/2 inch, 5/8 inch, 3/4 inch, 7/8 inch, 11⁄8 inch, 13⁄8 inch, 15⁄8 inch, 21⁄8 inch and 25⁄8 inch. If you need a higher pressure tube, thicker type is to be used to ensure it can handle the pressure of the refrigerant. Type K has the thickest wall tubing followed by Type L and Type M. There are three standard weight with different wall thickness for each type. The length commonly available is 10 feet or 20 feet. Fittings are used to obtain the configuration needed for the installation. It is not easily bent and should not be bent. This type of tubing is rigid, hard and stiff. There are basically two types of tube namely the hard-drawn and the soft type.
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