Daikin Outdoor Cooling/Heating Unit REYQ72TATJU

Warning: This procedure requires trained personnel with PPE!

Choose the type of vacuuming and dehydration

Enter the vacuum pump reading after 2 hours of operation

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

Enter the vacuum pump reading after additional 1 hour of operation (if required)

Did the vacuum reach –100.7 kPa (–14.6 psi) or less after additional 1 hour?

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

Enter the amount of refrigerant charged

Enter the pressure after pressurizing with nitrogen gas (only for special vacuuming and dehydration)

Warning: Ensure the power is OFF before starting the procedure

All wiring removed from the PCB

Waited for 10 minutes or more before measurement

Measurement mode for analog multimeter

Measurement in diode check mode for digital multimeter

Sign off on the power transistor check

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!

Enter the compressor capacity control

Refer to Compressor PI control for details

Low pressure protection control functional?

Hot gas bypass control functional?

Enter the superheated degree control of indoor unit electronic expansion valve

Enter the superheated degree control of outdoor unit electronic expansion valve

Superheated degree of suction gas

Superheated degree of suction gas

Electronic expansion valve open?