Daikin Indoor Cooling/Heating Unit FXMQ48PBVJU

Warning: This procedure requires trained personnel with PPE!

Choose the type of vacuuming and dehydration

Enter the vacuum pump reading after 2 hours of operation

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

Enter the vacuum pump reading after additional 1 hour of operation (if required)

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

Did the leak tests pass (if conducted)?

Enter the vacuum gauge reading after leaving the compressor in vacuum state for 1 hour

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

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?

Enter any additional observations or comments

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 Red

Resistance value between Yellow and Blue

Resistance value between Yellow and Brown

Warning: This procedure requires trained personnel with PPE!

Compressor PI control in cooling

Low pressure protection control

Superheated degree control in cooling

Superheated degree control in heating

All wiring removed from the PCB where power transistors are mounted on

Analog type of multimeter prepared

Power supply turned OFF and 10 minutes or more have passed before resistance measurement

Measurement made in resistance measurement mode in the x1 kΩ range when using the analog type of multimeter

Measurement made in diode check mode when using the digital type of multimeter

Sign off on the power transistor check