Daikin Indoor Cooling/Heating Unit FXAQ24PVJU

Superheating temperature control in cooling is conducted by indoor unit electronic expansion valve

Is the indoor unit electronic expansion valve functioning properly?

Superheating temperature control in heating is conducted by outdoor unit electronic expansion valve (main)

Is the outdoor unit electronic expansion valve functioning properly?

Judgement criteria of superheat operation: Suction gas superheated degree: 10°C (50°F) and over. Discharge gas superheated degree: 45°C (113°F) and over, except immediately after compressor starts up or is running under drooping control

Enter the suction gas superheated degree

Enter the discharge gas superheated degree

Does the superheat operation meet the judgement criteria?

Sign off on the superheat operation check

Choose the type of vacuuming and dehydration

Normal vacuuming and dehydration

Enter the vacuum pump reading after 2 hours

Did the vacuum reach –100.7 kPa (–14.6 psi) or less after 2 hours?

Enter the vacuum pump reading after additional 1 hour if needed

Did the vacuum reach –100.7 kPa (–14.6 psi) or less after 3 hours?

Did the vacuum gauge reading rise after leaving the compressor in vacuum state for 1 hour?

Special vacuuming and dehydration

Enter the vacuum pump reading after pressurizing with nitrogen gas up to 0.05 MPa (7.3 psi)

Warning: This procedure requires trained personnel with PPE!

Electronic Expansion Valve Coil checked

Remove the connector for electronic expansion valve (X7A) from PCB

Measure the resistance value between pins

No continuity between White and Yellow

Resistance value between White and Orange

Resistance value between White and Orange is approx. 300 Ω

Resistance value between White and Red

Resistance value between White and Red is approx. 150 Ω

Superheated degree of suction gas

Temperature of discharge air through the subcooled section is lower?

Superheated degree of suction gas

Warning: Ensure power is OFF before starting the procedure

All wiring removed from the PCB

Wait for 10 minutes before proceeding

Measurement mode for analog multimeter

Measurement in diode check mode for digital multimeter