Daikin RXF60B2V1B Installer's Reference Manual

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Daikin RXF60B2V1B Installer's Reference Manual Manual pdf 15 page image

6 InstallationInstaller reference guide15RXF50+60B2_RXF71A2_RXP50~71L2_(A)RXM42~71N2_RXJ50N2_RXA42+50B2R32 split series4P513661-6B – 2018.05To handle the stem cap▪ The stem cap is sealed where indicated with the arrow. Do NOTdamage it.▪ After handling the stop valve, tighten the stem cap, and check forrefrigerant leaks.Item Tightening torque (N∙m)Stem cap, liquid side 22~28Stem cap, gas side 49~59(a)61~74(b)(a) For class 42~60(b) For class 71To handle the service cap▪ ALWAYS use a charge hose equipped with a valve depressor pin,since the service port is a Schrader type valve.▪ After handling the service port, tighten the service port cap, andcheck for refrigerant leaks.Item Tightening torque (N∙m)Service port cap 11~146.4.7 To connect the refrigerant piping to theoutdoor unit▪ Piping length. Keep field piping as short as possible.▪ Piping protection. Protect the field piping against physicaldamage.1 Connect the liquid refrigerant connection from the indoor unit tothe liquid stop valve of the outdoor unit.abca Liquid stop valveb Gas stop valvec Service port2 Connect the gas refrigerant connection from the indoor unit tothe gas stop valve of the outdoor unit.NOTICEIt is recommended that the refrigerant piping betweenindoor and outdoor unit is installed in a ducting or therefrigerant piping is wrapped with finishing tape.6.5 Checking the refrigerant piping6.5.1 About checking the refrigerant pipingThe outdoor unit's internal refrigerant piping has been factory testedfor leaks. You only have to check the outdoor unit's externalrefrigerant piping.Before checking the refrigerant pipingMake sure the refrigerant piping is connected between the outdoorunit and the indoor unit.Typical workflowChecking the refrigerant piping typically consists of the followingstages:1 Checking for leaks in the refrigerant piping.2 Performing vacuum drying to remove all moisture, air ornitrogen from the refrigerant piping.If there is a possibility of moisture being present in the refrigerantpiping (for example, water may have entered the piping), first carryout the vacuum drying procedure below until all moisture has beenremoved.6.5.2 Precautions when checking therefrigerant pipingINFORMATIONAlso read the precautions and requirements in thefollowing chapters:▪ General safety precautions▪ PreparationNOTICEUse a 2-stage vacuum pump with a non-return valve thatcan evacuate to a gauge pressure of −100.7 kPa(−1.007 bar)(5 Torr absolute). Make sure the pump oildoes not flow oppositely into the system while the pump isnot working.NOTICEUse this vacuum pump for R32 exclusively. Using thesame pump for other refrigerants may damage the pumpand the unit.NOTICE▪ Connect the vacuum pump to the service port of thegas stop valve.▪ Make sure that the gas stop valve and liquid stop valveare firmly closed before performing the leak test orvacuum drying.6.5.3 To check for leaksNOTICEDo NOT exceed the unit's maximum working pressure (see"PS High" on the unit name plate).NOTICEMake sure to use a recommended bubble test solutionfrom your wholesaler. Do not use soap water, which maycause cracking of flare nuts (soap water may contain salt,which absorbs moisture that will freeze when the pipinggets cold), and/or lead to corrosion of flared joints (soapwater may contain ammonia which causes a corrosiveeffect between the brass flare nut and the copper flare).1 Charge the system with nitrogen gas up to a gauge pressure ofat least 200 kPa (2 bar). It is recommended to pressurize to3000 kPa (30 bar) in order to detect small leaks.2 Check for leaks by applying the bubble test solution to allconnections.3 Discharge all nitrogen gas.6.5.4 To perform vacuum dryingDANGER: RISK OF EXPLOSIONDo NOT start the unit if it is vacuumed.