Daikin SkyAir RZAG35A2V1B Installer's Reference Manual

Also see for RZAG35A2V1B: Installation manual

6 InstallationInstaller reference guide15RZAG35~60A2V1BR32 split series4P540076-1A – 2018.11To 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 21~28Stem cap, gas side 21~28(a)49~59 (b)(a) For class 35(b) For class 50+60To 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 Connections between outdoor and indoorunit using reducersINFORMATION▪ Use reducers in case the indoor unit refrigerant pipingdiameter does NOT match the outdoor unit refrigerantpiping diameter.▪ Apply the reducers on the indoor unit side.▪ ALWAYS use the same piping diameters as theconnections on the outdoor unit.▪ See the installation manual of the reducers option.Coat the threaded connection port of the outdoor unit where the flarenut comes in with refrigeration oil.NOTICEUse an appropriate wrench to avoid damaging theconnection thread by overtightening the flare nut. Becareful NOT to overtighten the nut, or the smaller pipe maybe damaged (about 2/3-1× the normal torque).6.4.8 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).