Daikin Branch Selector Unit BS6Q54TVJ

Overload control causing insufficient cooling capacity

Superheated degree of suction gas

Compressor lower in discharge pipe temperature despite of pressure loads

In heating, the temperature of discharge air through the subcooled section becomes lower

Superheated degree of suction gas

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 Red

Resistance value between Yellow and Blue

Resistance value between Yellow and Brown

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

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

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?