Carrier 42NQV025H Service Manual

Contents

– 9 –Table 3-2-1 Thicknesses of annealed copper pipesNominal diameter1/43/81/25/8Outer diameter (mm)6.359.5212.7015.88Thickness (mm)R410A R220.80 0.800.80 0.800.80 0.801.00 1.002. JointsFor copper pipes, flare joints or socket joints are used. Prior to use, be sure to remove all contaminants.a) Flare JointsFlare joints used to connect the copper pipes cannot be used for pipings whose outer diameter exceeds20 mm. In such a case, socket joints can be used.Sizes of flare pipe ends, flare joint ends and flare nuts are as shown in Tables 3-2-3 to 3-2-6 below.b) Socket JointsSocket joints are such that they are brazed for connections, and used mainly for thick pipings whosediameter is larger than 20 mm.Thicknesses of socket joints are as shown in Table 3-2-2.Table 3-2-2 Minimum thicknesses of socket jointsNominal diameter1/43/81/25/8Reference outer diameter ofcopper pipe jointed (mm)6.359.5212.7015.88Minimum joint thickness(mm)0.500.600.700.803-2-2. Processing of Piping MaterialsWhen performing the refrigerant piping installation, care should be taken to ensure that water or dust does notenter the pipe interior, that no other oil than lubricating oils used in the installed air-water heat pump is used,and that refrigerant does not leak. When using lubricating oils in the piping processing, use such lubricating oilswhose water content has been removed. When stored, be sure to seal the container with an airtight cap or anyother cover.1. Flare processing procedures and precautionsa) Cutting the PipeBy means of a pipe cutter, slowly cut the pipe so that it is not deformed.b) Removing Burrs and ChipsIf the flared section has chips or burrs, refrigerant leakage may occur.Carefully remove all burrs and clean the cut surface before installation.c) Insertion of Flare NutFILE NO. SVM-07013