Daikin Indoor Cooling/Heating Unit FXMQ15PBVJU

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 enables vacuuming down to –100.7 kPa (–14.6 psi)

Enter the vacuum level after 2 hours of vacuuming

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

Leak tests conducted if vacuum level does not reach –100.7 kPa (–14.6 psi) after 3 hours

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

Check if the vacuum gauge reading does not rise after leaving the compressor in vacuum state for 1 hour

Enter the amount of refrigerant charged

Special vacuuming and dehydration - In case of moisture may get mixed in the piping

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!

Compressor PI control in cooling

Low pressure protection control

Superheated degree control in cooling

Superheated degree control in heating