Daikin Indoor Cooling/Heating Unit FXAQ07PVJU

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.

Enter the suction gas superheated degree

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

Enter the discharge gas superheated degree

Are the values within the normal range?

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

Overload control causing insufficient cooling capacity

Superheated degree of suction gas

Compressor lower in discharge pipe temperature despite of pressure loads

In heating, the temperature of discharge air through the subcooled section becomes lower

Superheated degree of suction gas

Warning: Ensure power is OFF before starting the procedure

All wiring removed from the PCB

Power supply turned OFF and 10 minutes or more have passed

Measurement mode for analog multimeter

Measurement mode for digital multimeter is diode check mode

Sign off on the power transistor check

Warning: This procedure requires trained personnel with PPE!

Choose the type of vacuuming and dehydration

Vacuum pump enables vacuuming down to –100.7 kPa (–14.6 psi)?

Enter the vacuum level after 2 hours of evacuation

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

Enter the vacuum level after additional 1 hour of evacuation if needed

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

Enter the vacuum level after leaving the compressor in vacuum state for 1 hour