Daikin VRV X Series High-COP Type Air Conditioner RXQ32AHR

Warning: This test operation requires trained personnel with PPE!

Check of wrong wiring (communication check with indoor units)

Check of the stop valves opening

Indoor units operation should also be checked separately

Make sure to carry out the system test operation after the first installation

Abnormalities on indoor units cannot be checked for each unit separately

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

CHECK 6 In case of VRV systems, the only way to judge as the overcharge of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control.

As information for making a judgment, refer to the information below.

Diagnosis of refrigerant overcharge

1. High pressure rises. Consequently, overload control is conducted to cause insufficient cooling capacity.

2. The superheating degree of suction gas lowers (or wet operation is performed).

Consequently, the compressor becomes lower in discharge pipe temperature despite of pressure loads.

3. The subcooling degree of condensate rises.;

Is the temperature setting of the remote controller at the lowest level in cooling mode or in test mode?

Is the air from indoor unit cool?

Is the air from outdoor unit warm?

Is the air flow from indoor unit stable?

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

Values are balanced and there is no short circuiting

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?

If there is no continuity, the transmission wiring may have broken wires.

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'