Daikin Indoor Cooling/Heating Unit FXMQ09PBVJU

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

Check continuity between White and Yellow

Measure resistance value between White and Orange

Measure resistance value between White and Red

Measure resistance value between Yellow and Blue

Measure resistance value between Yellow and Brown

Sign off on the Electronic Expansion Valve Coil Check

Check for High Pressure in cooling

Check for High Pressure in heating

Check for broken wire of the relay wire

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

Turn OFF the power supply to all equipment

Short circuit between the outdoor-outdoor unit terminal F1 and F2 in the 'Outdoor Unit A'

Conduct continuity checks between the transmission wiring terminal blocks F1 and F2 of the central remote controller using a multimeter

Normal vacuuming and dehydration

Vacuum pump connected to service ports of liquid pipe and gas pipe

Enter the vacuum level after 2 hours of vacuuming

Did the vacuum level reach –100.7 kPa (–14.6 psi) or less?

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

Did the vacuum level reach –100.7 kPa (–14.6 psi) or less after additional vacuuming?

Compressor left at the degree of vacuum of –100.7 kPa (–14.6 psi) or less for a period of 1 hour or more

Did the vacuum gauge reading rise?

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

Details of compressor capacity control while in cooling, refer to Compressor PI control

The low pressure protection control includes low pressure protection control and hot gas bypass control

In cooling, the indoor unit electronic expansion valve is used for superheated degree control

In heating, the outdoor unit electronic expansion valve is used for superheated degree control of outdoor unit heat exchanger

Enter the high pressure reading

Did the system pass the pressure check?