Daikin Indoor Cooling/Heating Unit FXMQ07PBVJU

Warning: This procedure requires trained personnel with PPE!

Check Electronic Expansion Valve Coil

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

Measure the resistance value between White and Yellow

No continuity between White and Yellow

Measure the resistance value between White and Orange

Resistance value between White and Orange is approx. 300 Ω

Measure the resistance value between White and Red

Resistance value between White and Red is approx. 150 Ω

Check for High Pressure in cooling

Check for High Pressure in heating

Check for broken wire of the relay wire (p.299)

Procedure for checking outdoor-outdoor unit transmission wiring for broken wires

Procedure for checking indoor-outdoor unit transmission wiring for broken wires

Check Fan Motor Connector (Power Supply Cable) (p.300)

Check Fan Motor Connector (Signal Cable) (p.300)

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?

Warning: Ensure power is OFF before starting the procedure

All wiring removed from the PCB

Prepare the analog type of multimeter. For the digital type of multimeter, those with diode check function are available for the checking

Wait for 10 minutes or more before making measurement of resistance

When using the analog type of multimeter, make measurement in resistance measurement mode in the x1 kΩ range

Measurement made in resistance measurement mode in the x1 kΩ range

Warning: This procedure requires trained personnel with PPE!

Compressor PI control in cooling

Low pressure protection control

Superheated degree control by indoor unit electronic expansion valve in cooling

Superheated degree control by outdoor unit electronic expansion valve in heating

Enter the high pressure reading