Carrier 42TGV0131CP Service Manual

6-6-6. Handling of Existing PipeWhen using the existing pipe, carefully check it forthe following:s Wall thickness (within the specified range) s Scratches and dentss Water, oil, dirt, or dust in the pipes Flare looseness and leakage from weldss Deterioration of copper pipe and heat insulatorCautions for using existing pipes Do not reuse the flare to prevent gas leak.Replace it with the supplied flare nut and thenprocess it to a flare.s Blow nitrogen gas or use an appropriate means tokeep the inside of the pipe clean.If discolored oil or much residue is discharged,wash the pipe.s Check welds, if any, on the pipe for gas leak.When the pipe corresponds to any of the follow-ing, do not use it. Install a new pipe instead.s The pipe has been open (disconnected from indoor unit or outdoor unit) for a long period.s The pipe has been connected to an outdoor unitthat does not use refrigerant R22, R32 orR407C.s The existing pipe must have a wall thickness equalto or larger than the following thickness.s Never use any pipe with a wall thickness less thanthese thicknesses due to insufficient pressurecapacity.Reference outside diameter(mm)Ø6.4Ø9.5Ø12.7Wall thickness(mm)0.80.80.8Do not apply the refrigerator oil to the flare surface.HAPiping necessary to change the flare nut/machining size due to pipe compression.1) Flare nut width: H2) Flare machining size: A(mm)36Ø19.029Ø15.9262724Ø12.722Ø9.517Ø6.4Sameas aboveCopper pipeouter dia.For R22For R32Same as above(mm)24.0Ø19.019.7Ø15.916.6Ø12.713.2Ø9.59.123.319.416.213.09.0Ø6.4Copper pipeouter dia.For R22For R32Becomes large a little for R32Ø15.9 1.0FILE NO. SVM-19024- 32 -Ø19.0 1.0