Samsung AM***FXVAF Series Installation Manual

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75ENGLISHAir tightness test and vacuum dryingAir tightness testf Use tools for R-410A to prevent the inflow of foreign substances and resist against the internal pressure.f Do not remove the core of filling port.f Use Nitrogen gas for air tightness test as shown in the illustration.H/P H/RManifold gageHigh pressuresideLow pressure sideFilling portGas pipe Liquid pipeNitrogen gasService valveManifold gageHighpressuresideLowpressuresideFilling portGas pipeLiquid pipeHigh pressuregas pipeNitrogen gasService valveApply pressure to the liquid side pipe and gas side pipe(when installing outdoor units in module) with Nitrogengas at 4.1MPa(594.6psi).If you apply pressure at more than 4.1MPa(594.6psi), pipes mayget damaged. Apply pressure with pressure regulator and payattention to the pressure of the nitrogen.Keep it for minimum 24 hours to check if pressure drops. After applying Nitrogen gas, check there's any change ofpressure, using a pressure regulator.If the pressure drops, check for gas leakage. If the pressure is changed, apply soap water to check for leakageand check the pressure of the nitrogen gas again.Maintain 1.0MPa(145psi) of the pressure beforeperforming vacuum drying and check for further gasleakage.After checking the first gas leakage, maintain 1.0MPa(145psi) tocheck for further gas leakage.• Perform a Nitrogen gas leak test with the service valve of the outdoor unit closed.• When charging the nitrogen gas, charge it from the both (high•low pressure) sides.• If the pipe is filled in a short time with a highly excessive pressure of Nitrogen gas, the pipes may get damaged.Make sure to use a regulator to prevent the high pressure Nitrogen gas, over 4.1MPa(594.6psi), from enteringinto the pipe.CAUTIONk}tGzG⴬㨰䛙G㐘㞬ὤGptluki]_TWZ_XYhTW_UGGG^\ YWX_TW]TXXGGG㝘䟸G[a[_a[^