Daikin VRV Aurora Series Air Conditioner RXLQ240TBTJA

Check the fan motor connector according to the following procedure.

2. Measure the resistance between phases of U, V, W at the motor side connectors (3-core wire) to check that the values are balanced and there is no short circuiting, while connector or relay connector is disconnected.;

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

Resistance between Vcc and U phase

Resistance between Vcc and V phase

Resistance between Vcc and W phase

Resistance between Vcc and GND phase

Resistance values balanced within the range of ± 20%

Negative pole connected to Vcc and positive pole connected to GND

Sign off on the fan motor connector check

Warning: This check requires trained personnel with PPE!

Enter the superheating degree of suction gas

Is the compressor discharge gas temperature higher?

Has the electronic expansion valve turned open?

Is the unit not demonstrating cooling/heating capacity?

Sign off on the refrigerant shortage check

Warning: This procedure requires trained personnel with PPE!

Enter the high pressure reading

Is the cooling capacity insufficient due to high pressure?

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

In heating, is the temperature of discharge air through the subcooled section lower?

Sign off on the refrigerant overcharge check