Daikin VRV X Series High-COP Type Air Conditioner RXQ12AHR

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)

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

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

With the outdoor-outdoor unit terminal of the 'Outdoor Unit A' short circuited, conduct continuity checks between the transmission wiring terminal blocks F1 and F2 of the unified ON/OFF controller

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

Turn OFF the power supply to all equipment

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 compressor operating (sound or vibration)?

Warning: This check requires trained personnel with PPE!

Enter the high pressure reading

Is overload control conducted causing insufficient cooling capacity?

Enter the superheating degree of suction gas

Is the compressor lower in discharge pipe temperature despite of pressure loads?

Enter the subcooling degree of condensate

Is the subcooling degree of condensate high?

Sign off on the refrigerant overcharge check