Maintenance And Service; Maintenance Safety Precautions; To Prevent Electrical Hazards - Daikin VRV IV+ RYYQ14U7Y1B Series Installer And User Manual

23 Maintenance and service

In this chapter

23.1 Maintenance safety precautions

23.1.1 To prevent electrical hazards

RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1B – 2020.10
NOTICE
Maintenance MUST be done by an authorized 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
23.1 Maintenance safety precautions............................................................................................................................................ 153
23.1.1 To prevent electrical hazards................................................................................................................................. 153
23.2 About service mode operation............................................................................................................................................... 154
23.2.1 To use vacuum mode ............................................................................................................................................. 154
23.2.2 To recover refrigerant............................................................................................................................................ 154
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.
23 Maintenance and service
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equivalent.
2
equivalent tonnes: GWP value of the
2
Installer and user reference guide
153