Daikin Indoor Cooling/Heating Unit FXMQ18PVJU

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 leaving the compressor in vacuum state?

Enter the amount of refrigerant charged

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: This procedure requires trained personnel with PPE!

Compressor PI control in cooling mode

Low pressure protection control

Superheated degree control with indoor unit electronic expansion valve in cooling mode

Superheated degree control with outdoor unit electronic expansion valve in heating mode

Warning: Ensure power is OFF before starting the procedure

Remove all the wiring connected to the PCB where power transistors are mounted on

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

Select the type of multimeter used

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

If using the digital type of multimeter, make measurement in diode check mode

Superheated degree of suction gas

Superheated degree of suction gas

Electronic expansion valve open?