Maintenance And Service; Maintenance Safety Precautions; To Prevent Electrical Hazards - Daikin VRV IV+ RYYQ8U7Y1B Series Installer And User Manual

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Maintenance and service

22 Maintenance and service
In this chapter

22.1 Maintenance safety precautions

22.1.1 To prevent electrical hazards

Installer and user reference guide
152
NOTICE
Maintenance MUST be done by an authorised installer or service agent.
We recommend performing maintenance at least once a year. However, applicable
legislation might require shorter maintenance intervals.
NOTICE
Applicable legislation on fluorinated greenhouse gases requires that the refrigerant
charge of the unit is indicated both in weight and CO
Formula to calculate the quantity in CO
refrigerant × total refrigerant charge [in kg] / 1000
22.1 Maintenance safety precautions............................................................................................................................................ 152
22.1.1 To prevent electrical hazards................................................................................................................................. 152
22.2 About service mode operation............................................................................................................................................... 153
22.2.1 To use vacuum mode ............................................................................................................................................. 153
22.2.2 To recover refrigerant............................................................................................................................................ 153
DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING/SCALDING
NOTICE: Risk of electrostatic discharge
Before performing any maintenance or service work, touch a metal part of the unit in
order to eliminate static electricity and to protect the PCB.
When performing service to inverter equipment:
1 Do NOT open the electrical component box cover for 10 minutes after turning
off the power supply.
2 Measure the voltage between terminals on the terminal block for power
supply 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 the
voltage of the capacitor in the main circuit is less than 50 V DC. If the voltage
measured is still higher than 50 V DC, discharge the capacitors in a safe
manner by using a dedicated capacitor discharge pen to avoid possibility of
sparking.
equivalent.
2
equivalent tonnes: GWP value of the
2
4P546228-1C – 2021.11
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump