Daikin Outdoor Unit For Reverse Cycle System RY100KUY1

Warning: High pressure checks should be performed by trained personnel only

Enter the current pressure level

Is the pressure level above the normal range?

If pressure is above normal, proceed with the following checks

List the issues found during the condenser side check

Sign off on the high pressure check

Temperature differences must occur before or after the clogged points!

Replace the electronic expansion valve.

Blow a nitrogen gas, and then replace the refrigerant.

Replace the heat exchanger or distributor.

Collapsed pipe Replace the pipe.

As criteria for judging whether refrigerant is inadequate or not, refer to the following operating conditions.

<Diagnosis of inadequate refrigerant>

(1) As suction superheated degree increases due to refrigerant shortage, the electronic expansion valve tends to open (opens fully) in order to avoid overheat operation.

(2) In response to decreased evaporator capacity caused by refrigerant shortage, capacity is controlled in the inverter in order to maintain low pressure, which results in a decrease in frequency.

(3) Because of (1) and (2) above, the compressor frequency decreases despite a large difference (large load) between temperature set by the remote controller and suction air temperature, resulting that cooling capacity becomes unavailable.

(4) If refrigerant shortage worsens, the electronic expansion valve remains fully open and suction superheated degree further increases. In addition, as compressor frequency drops to the level of the lowest frequency (41 Hz), low pressure cannot be maintained

<Diagnosis of inadequate refrigerant>

Warning: Disconnect the thermistor from the PCB before proceeding

Thermistor disconnected from the PCB

Temperature reading from the thermistor

Resistor value from the thermistor

Upload a photo of the table with the measured values

Do the measured values correspond with the values in the table?

Sign off on the thermistor check

Set operation OFF and power OFF. Disconnect the connector.

Keep operation OFF and power OFF. Connect the connector.

2 pulses (0 and 5 VDC) are output 4 times at the pins 1 - 4 when the fan motor is rotated 1 turn by hand.

Select the replacement part if any

Sign off on the fan motor pulse check