Daikin Indoor Cooling/Heating Unit FXMQ24PBVJU

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

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?

Leak tests conducted if vacuum level did not reach the required level

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

Enter the vacuum gauge reading after 1 hour

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

Measurement of resistance made after a lapse of 10 minutes or more

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

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