Daikin VRV X Series High-COP Type Air Conditioner RXQ20AHR

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)?

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

Is the power to the outdoor unit and the connected indoor units turned ON?

Is the default (idle) situation existing?

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

Warning: This check requires trained personnel with PPE!

CHECK 7: VRV systems refrigerant shortage diagnosis

Measure the superheating degree of suction gas

Is the compressor discharge gas temperature higher?

Does the electronic expansion valve turn open?

Does low pressure drop causing 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 phases of the motor connector

Resistance between the V and W phases of the motor connector

Resistance between the W and U phases of the motor connector

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'

To carry out a test operation, check the following:

Check that the temperature setting of the remote controller is at the lowest level in cooling mode or use test mode.

Go through the following checklist:;