Daikin Cooling-Only Outdoor Unit RKS25G2V1B

Warning: Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work.

Removed the 2 nuts of the compressor?

Warning: Be careful not to get yourself burnt with the pipes and other parts that are heated by the gas brazing machine.

Warning: If the refrigerant gas leaks during work, ventilate the room. (If the refrigerant gas is exposed to flames, toxic gas may be generated.)

Warning: Since it may happen that the refrigerant oil in the compressor catches fire, prepare wet cloth so as to extinguish fire immediately.

Caution: From the viewpoint of global environment protection, do not discharge the refrigerant gas in the atmosphere. Make sure to collect all the refrigerant gas.

Restored the piping by nonoxidation brazing?

Prevented the carbonization of the oil inside the four way valve and the deterioration of the gaskets affected by heat? (Keep below 120°C.)

Warning: Ensure that the voltage between (+) and (–) of the diode bridge (DB1) is approx. 0 V before checking.

Enter the resistance between the pins of the DB1

Is the resistance ∞ or less than 1 kΩ?

If the resistance is ∞ or less than 1 kΩ, short circuit occurs on the main circuit.

Sign off on the main circuit short check

EV connector correctly connected to the PCB

EV generates latching sound when power is turned off and on again

Continuity confirmed when connector is disconnected and checked with a tester

Check the continuity between the pins

EV coil is not faulty if there is continuity between the pins

Outdoor unit PCB is not faulty if continuity is confirmed

Note: The latching sound varies depending on the valve type

Sign off on the electronic expansion valve check

Check the connection of connector

Check the motor power supply voltage output (pins 4 - 7)

Check the motor control voltage (pins 4 - 3)

Check the rotation command voltage (pins 4 - 2)

Check the rotation pulse (pins 4 - 1)

Sign off on the fan motor connector output check

Warning: This procedure requires trained personnel with PPE!

Control voltage between pins 3 - 4

Rotation command voltage between pins 2 - 4

Outdoor fan motor functioning properly?