Daikin VRV X Series High-COP Type Air Conditioner RXQ14AHR

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 since power supply turned OFF

Measurement mode for analog multimeter

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

Remove the X1A connector from the fan PCB (A2P)

Measure the resistance between the U and V, V and W, and W and U phases of the motor connector

Fan Motor Connector Check (Signal Cable): CHECK 17 Resistance measuring points and judgment criteria.

Measure the resistance between GND and Vcc, Hw, Hv, or Hu terminals of the motor connector

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:;

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'

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