Daikin VRV IV+ RXYTQ8U5/U7YF Installation And Operation Manual

14 Piping installationInstallation and operation manual14RXYTQVRV IV+ heat pump for high ambient temperatures4P546223-1C – 2021.118 HP2× SW810~16 HP6× SW8NOTICEWhen closing the electrical component box cover, makesure that the sealing material on the lower back side of thecover is NOT caught and bent towards the inside (seefigure below).abcdea Electrical component box coverb Front sidec Power supply terminal blockd Sealing materiale Moisture and dirt could enterNOT allowedAllowed13.2 Mounting the outdoor unit13.2.1 To provide the installation structureMake sure the unit is installed level on a sufficiently strong base toprevent vibration and noise.NOTICE▪ When the installation height of the unit needs to beincreased, do NOT use stands to only support thecorners.▪ Stands under the unit must be at least 100 mm wide.≥100 mm≥100 mm*NOT allowedAllowed (* = preferred installation)▪ The height of the foundation must at least be 150 mm from thefloor. In heavy snowfall areas, this height should be increased,depending on the installation place and condition.▪ The preferred installation is on a solid longitudinal foundation(steel beam frame or concrete). The foundation must be largerthan the grey marked area.729≤613≥929≥ABAAa (mm)Minimum foundationa Anchor point (4×)HP AA AB8 766 99210~16 1076 1302▪ Fasten the unit in place using four foundation bolts M12. It is bestto screw in the foundation bolts until their length remains 20 mmabove the foundation surface.20 mmNOTICE▪ Prepare a water drainage channel around thefoundation to drain waste water from around the unit.During heating operation and when the outdoortemperatures are negative, the drained water from theoutdoor unit will freeze up. If the water drainage is nottaken care of, the area around the unit might be veryslippery.▪ When installed in a corrosive environment, use a nutwith plastic washer (a) to protect the nut tightening partfrom rust.a14 Piping installation14.1 Preparing refrigerant piping14.1.1 Refrigerant piping requirementsNOTICERefrigerant R410A requires strict cautions for keeping thesystem clean and dry. Foreign materials (including mineraloils or moisture) should be prevented from getting mixedinto the system.NOTICEThe piping and other pressure-containing parts shall besuitable for refrigerant. Use phosphoric acid deoxidisedseamless copper for refrigerant.▪ Only use phosphoric acid deoxidised seamless copper.▪ Foreign materials inside pipes (including oils for fabrication) mustbe ≤30 mg/10 m.▪ Temper grade: use piping with temper grade in function of thepipe diameter as listed in table below.