Samsung NS Series User & Installation Manual

20Purging the unitOn delivery, the indoor unit is loaded with inert gas.All this gas must be purged before connecting the assembly piping. To purge the inert gas, proceed as follows.Unscrew the pinch pipe at the end of each refrigerant pipe.Result : All inert gas escapes from the indoor unit.• To prevent dirt or foreign objects from getting into the pipes duringinstallation, do NOT remove the pinch pipe completely until you areready to connect the piping.NOTELiquidrefrigerant portGas refrigerant portConnecting the refrigerant pipeThere are two refrigerant pipes of differing diameters :f A smaller one for the liquid refrigerantf A larger one for the gas refrigerantf The inside of copper pipe must be clean & has no dust.1. Remove the pinch pipe on the pipes and connect the assembly pipes to eachpipe, tightening the nuts, first manually and then with a torque wrench, aspanner applying the following torque.Outer Diameter (D) Torque (N•m)ø6.35 mm 16ø9.52 mm 42ø12.70 mm 55ø15.88 mm 65ø19.05 mm 100• Must apply refrigerant oil on the flaring area to prevent a leak.NOTE2. Must use insulator which is thick enough to cover the refrigerant tube toprotect the condensate water on the outside of pipe falling onto the floor andthe efficiency of the unit will be better.3. Cut off any excess foam insulation.4. Be sure that there must be no crack or wave on the bended area.5. It would be necessary to double the insulation thickness(10mm or more) toprevent condensation even on the insulator when if the installed area is warmand humid.6. Do not use joints or extensions for the pipes that connect the indoor andoutdoor unit. The only permitted connections are those for which the units aredesigned.Refrigerant oilTorque wrenchFlare nutUnionSpannerLiquidrefrigerant portGas refrigerant port❋ The designs and shape are subject tochange according to the model.