Daikin Daikin Branch Selector Unit BS8Q54TVJ BS8Q54TVJ

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 pump run time in hours

Degree of vacuum reached –100.7 kPa (–14.6 psi) or less?

Leak tests conducted if vacuum did not reach –100.7 kPa (–14.6 psi) or less after 3 hours?

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

Vacuum gauge reading did not rise after 1 hour?

Enter the amount of refrigerant charged

Superheated degree of suction gas

Is the compressor lower in discharge pipe temperature?

Is the temperature of discharge air through the subcooled section lower?

Superheated degree of suction gas

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

Analog type of multimeter prepared

Power supply turned OFF and 10 minutes or more have passed before resistance measurement

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!

For 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?

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)