Daikin Indoor Cooling/Heating Unit FXMQ24PVJU

Remove the connector for electronic expansion valve (X7A) from PCB

Check continuity between White and Yellow

Measure resistance value between White and Orange

Measure resistance value between White and Red

Measure resistance value between Yellow and Blue

Measure resistance value between Yellow and Brown

Sign off on the Electronic Expansion Valve Coil Check

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

Enter the superheating temperature in cooling

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

Enter the superheating temperature in heating

Judgement criteria of superheat operation: Suction gas superheated degree: 10°C (50°F) and over. Discharge gas superheated degree: 45°C (113°F) and over, except immediately after compressor starts up or is running under drooping control

Is the suction gas superheated degree 10°C (50°F) and over?

Is the discharge gas superheated degree 45°C (113°F) and over, except immediately after compressor starts up or is running under drooping control?

Enter any additional observations or comments

Sign off on the superheat operation check

Choose the type of vacuuming and dehydration

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

Enter the vacuum level achieved after 2 hours of vacuuming

Did the vacuum level reach –100.7 kPa (–14.6 psi) or less after 2 hours?

Enter the vacuum level achieved after additional 1 hour of vacuuming

Did the vacuum level reach –100.7 kPa (–14.6 psi) or less after 3 hours?

Leak tests conducted if vacuum level 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

Did the vacuum gauge reading rise after leaving the compressor in vacuum state for 1 hour or more?

High pressure rises causing overload control

Superheated degree of suction gas lowers

Subcooled degree of condensate rises

Superheated degree of suction gas rises causing higher compressor discharge gas temperature

Superheated degree of suction gas rises causing the electronic expansion valve to turn open

Low pressure drops causing the unit not to demonstrate cooling capacity

Sign off on the refrigerant 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)