Daikin Branch Selector Unit BS6Q54TVJ

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

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

Superheating temperature control in cooling is conducted by indoor unit electronic expansion valve

Is the indoor unit electronic expansion valve functioning properly?

Superheating temperature control in heating is conducted by outdoor unit electronic expansion valve (main)

Is the outdoor unit electronic expansion valve functioning properly?

Judgement criteria of superheat operation: Suction gas superheated degree: 10°C (50°F) and over.

Enter the suction gas superheated degree

Judgement criteria of superheat operation: Discharge gas superheated degree: 45°C (113°F) and over, except immediately after compressor starts up or is running under drooping control

Enter the discharge gas superheated degree

Does the superheat operation meet the judgement criteria?

Normal vacuuming and dehydration

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

Run the vacuum pump for a period of 2 or more hours to conduct evacuation to –100.7 kPa (–14.6 psi) or less

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

If the degree of vacuum does not reach –100.7 kPa (–14.6 psi) or less, conduct evacuation for a period of another 1 hour

Degree of vacuum reached –100.7 kPa (–14.6 psi) or less after additional hour

If the degree of vacuum does not reach –100.7 kPa (–14.6 psi) or less even after 3 hours, conduct the leak tests

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 does not rise after 1 hour