Daikin Outdoor Heat Pump ARXS42G2V1B

Warning: Disconnect the connectors of the thermistors from the PCB before proceeding

Thermistors disconnected from the PCB

Measure the resistance of each thermistor

Upload a photo of the tester reading

For models with thermistor directly mounted on the PCB, disconnect the connector for the PCB and measure

Connector for the PCB disconnected

Measure the resistance of the thermistor mounted on the PCB

Upload a photo of the tester reading

Sign off on the thermistor resistance check

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

Disconnect the lead wires of the compressor.

Unfasten the hooks with a flat screwdriver to remove the overload protector.

Remove 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.

Warning: This procedure requires trained personnel with PPE!

Enter the power supply waveform measurement between No. 1 and No. 2 on the terminal board

Is the power supply waveform a sine wave?

Is there waveform disturbance near the zero cross?

Sign off on the power supply waveforms check

Warning: Ensure 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.

Warning: This procedure requires trained personnel with PPE!

Control voltage between the pins 3 - 4

Rotation command voltage between the pins 2 - 4

2 pulses (0 ~ 15 VDC) are output at the pins 1 - 4 when the fan motor is rotated 1 turn by hand

Voltage between the pins 10 - 11 is 15 VDC

Hall IC generates the rotation pulse (0 ~ 15 VDC) 4 times between the pins 10 - 12, 10 - 13, when the fan motor is manually rotated once

If any step is NG, select the defective part

Sign off on the rotation pulse check