Daikin VRV IV+ RXYTQ8U5YF Installer And User Manual

Also see for VRV IV+ RXYTQ10U7YF: Installer and user reference guide Installation and operation manual

22 | Maintenance and serviceInstaller and user reference guide124RXYTQVRV IV+ heat pump for high ambient temperatures4P561157-1B – 2021.1122 Maintenance and serviceNOTICEMaintenance MUST be done by an authorised installer or service agent.We recommend performing maintenance at least once a year. However, applicablelegislation might require shorter maintenance intervals.NOTICEApplicable legislation on fluorinated greenhouse gases requires that the refrigerantcharge of the unit is indicated both in weight and CO2 equivalent.Formula to calculate the quantity in CO2 equivalent tonnes: GWP value of therefrigerant × total refrigerant charge [in kg] / 1000In this chapter22.1 Maintenance safety precautions............................................................................................................................................ 12422.1.1 To prevent electrical hazards................................................................................................................................. 12422.2 About service mode operation............................................................................................................................................... 12522.2.1 To use vacuum mode ............................................................................................................................................. 12522.2.2 To recover refrigerant............................................................................................................................................ 12622.1 Maintenance safety precautionsDANGER: RISK OF ELECTROCUTIONDANGER: RISK OF BURNING/SCALDINGNOTICE: Risk of electrostatic dischargeBefore performing any maintenance or service work, touch a metal part of the unit inorder to eliminate static electricity and to protect the PCB.22.1.1 To prevent electrical hazardsWhen performing service to inverter equipment:1 Do NOT open the electrical component box cover for 10 minutes after turningoff the power supply.2 Measure the voltage between terminals on the terminal block for powersupply with a tester and confirm that the power supply is shut off. In addition,measure points as shown in the figure, with a tester and confirm that thevoltage of the capacitor in the main circuit is less than 50 V DC. If the voltagemeasured is still higher than 50 V DC, discharge the capacitors in a safemanner by using a dedicated capacitor discharge pen to avoid possibility ofsparking.