Daikin VRV X Series High-COP Type Air Conditioner RXQ18AHR

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:;

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

CHECK 4: Perform the following procedures prior to check.

Remove all the wiring connected to the PCB where power transistors are mounted on

Point of Measurement and Judgment Criteria

Time elapsed after power supply turned OFF

Measurement mode for analog multimeter

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

Fan Motor Connector Check (Power Supply Cable):

CHECK 16: 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.

Measurement of power wire connector.

Remove the X1A connector from the fan PCB (A2P) and measure the resistance between the U and V, V and W, and W and U phases of the motor connector (with five conductors) and check that each phase are balanced (within a permissible dispersion range of ±20%)

Fan Motor Connector Check (Signal Cable):