Daikin VRV X Series Standard Type Air Conditioner RXQ10ARY1

Warning: This check requires trained personnel with PPE!

CHECK 7: In case of VRV systems, the only way to judge as the shortage of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control.

Enter the superheating degree of suction gas

Has the compressor discharge gas temperature become higher?

Has the electronic expansion valve turned open?

Has the low pressure dropped to cause the unit not to demonstrate cooling capacity?

Sign off on the refrigerant shortage check

Resistance between phases of U, V, W at the motor side connectors

Values are balanced and there is no short circuiting

X1A connector removed from the fan PCB (A2P)

Resistance between the U and V, V and W, and W and U phases of the motor connector

Each phase are balanced (within a permissible dispersion range of ±20%)

Fan Motor Connector Check (Signal Cable)

Procedure for checking outdoor-outdoor unit transmission wiring for broken wires

Turn OFF the power supply to all equipment

Short circuit between the outdoor-outdoor unit terminal F1 and F2 in the 'Outdoor Unit A'

Conduct continuity checks between the transmission wiring terminal blocks F1 and F2 of the central remote controller using a multimeter

Is there continuity between the said terminal blocks?

Conduct continuity checks between the transmission wiring terminal blocks F1 and F2 of the unified ON/OFF controller

Conduct continuity checks between the outdoor-outdoor unit terminal of the 'Outdoor Unit E'

Conduct continuity checks between the outdoor-outdoor unit terminal of the 'Outdoor Unit D'

Conduct continuity checks between the outdoor-outdoor unit terminal of the 'Outdoor Unit C'

CHECK 4: Perform the following procedures prior to check.

All wiring removed from the PCB where power transistors are mounted on

Point of Measurement and Judgment Criteria

Waited for 10 minutes or more after turning OFF the power supply

Measurement mode for analog multimeter

Warning: This test operation requires trained personnel with PPE!

INFORMATION: It may take 10 minutes to achieve a uniform refrigerant state before the compressor starts.

During the test operation, the refrigerant running sound or the magnetic sound of a solenoid valve may become loud and the display indication may change. These are not malfunctions.

All front panels are closed (except the electrical component box inspection opening service cover)

Power to the outdoor unit and the connected indoor units is ON

NOTICE: Be sure to turn on the power 6 hours before operation in order to protect the compressor

Default (idle) situation is existing

Push BS2 for 5 seconds or more. The unit will start test operation.