Panasonic CS-E18CKE Service Manual

Contents

2. Procedure and precautions for flare connectionTable 11 R410A flaring dimensionsNominaldiameterOutsidediameter(mm)Wall thickness(mm)A (mm)R410A flaringtool, clutch typeConventional flaring toolClutch type Wing-nut type1/4 6.35 0.8 0 - 0.5 1.0 - 1.5 1.5 - 2.03/8 9.52 0.8 0 - 0.5 1.0 - 1.5 1.5 - 2.01/2 12.70 0.8 0 - 0.5 1.0 - 1.5 2.0 - 2.5Table 12 R410A flaring dimensionsNominaldiameterOutsidediameter(mm)Wall thickness(mm)A (mm)R410A flaringtool, clutch typeConventional flaring toolClutch type Wing-nut type1/4 6.35 0.8 0 - 0.5 0.5 - 1.0 1.0 - 1.53/8 9.52 0.8 0 - 0.5 0.5 - 1.0 1.0 - 1.51/2 12.70 0.8 0 - 0.5 0.5 - 1.0 1.5 - 2.0Table 13 R410A flaring and flare nut dimensions Unit: mmNominaldiameterOutsidediameter (mm)Wall thickness(mm)A +0, -0.4 BdimensionCdimensionDdimensionFlare nutwidth1/4 6.35 0.8 9.1 9.2 6.5 13 173/8 9.52 0.8 13.2 13.5 9.7 20 221/2 12.70 0.8 16.6 16.0 12.9 23 26Table 14 R410A flaring and flare nut dimensions Unit: mmNominaldiameterOutsidediameter (mm)Wall thickness(mm)A +0, -0.4 BdimensionCdimensionDdimensionFlare nutwidth1/4 6.35 0.8 9.0 9.2 6.5 13 173/8 9.52 0.8 13.0 13.5 9.7 20 221/2 12.70 0.8 16.2 16.0 12.9 20 24a. Check to make sure there are no scratches, dust, etc., on the flare and union.b. Align the flared surface with the axial center of the union.c. Use a torque wrench, and tighten to the specified torque. The tightening torque for R410A is the same as the conventionaltorque value for R22. Be careful, because if the torque is too weak, it may lead to a gas leak. If it is too strong, it may splitthe flare nut or make it impossible to remove the flare nut.Table 15 R410A tightening torqueNominaldiameterOutsidediameter (mm)Tightening torqueN.m (kgf.cm)Torque wrench tightening torqueN.m (kgf.cm)1/4 6.35 14 - 18 (140 - 180) 18 (180)3/8 9.52 33 - 42 (330 -420) 42 (420)1/2 12.70 55 (550) 55 (550)10.3.3. Storing and managing Piping Materials1. Types of piping and their storageThe following is a general classification of the refrigerant pipe materials used for ACs.Because the gas pressure of R410A is approximately 1.6 times as high as that of R22, copper pipes with the thickness shownin Table 10, and with minimal impurities must be used. Care must also be taken during storage to ensure that pipes are notcrushed, deformed, or scratched, and that no dust, moisture or other substance enters the pipe interior. When storing sheathedcopper pipes or plain copper pipes, seal the openings by pinching or taping them securely.2. Makings and managementa. Sheathed copper pipes and copper-element pipesWhen using these pipes, check to make sure that they are the stipulated thickness. For flare nuts, be sure to used the samenut that is used on the AC unit.58