Daikin Indoor Cooling/Heating Unit FXMQ36PBVJU

Warning: This procedure requires trained personnel with PPE!

Check Electronic Expansion Valve Coil

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 (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)

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

Did the vacuum gauge reading rise?

Warning: Ensure the power is OFF before starting the procedure

All wiring removed from the PCB where power transistors are mounted

Prepare the analog type of multimeter. For the digital type of multimeter, those with diode check function are available for the checking

Wait for 10 minutes or more before making measurement of resistance

When using the analog type of multimeter, make measurement in resistance measurement mode in the x1 kΩ range

Measurement made in resistance measurement mode in the x1 kΩ range

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