Daikin Outdoor Cooling/Heating Unit REYQ144TTJU

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!

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 3 hours?

Did the leak tests pass (if conducted)?

Enter the vacuum gauge reading after leaving the compressor in vacuum state for 1 hour

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

Warning: This procedure requires trained personnel with PPE!

Compressor PI control in cooling mode

Low pressure protection control

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

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

Superheated degree of suction gas

Superheated degree of suction gas for shortage check

Electronic expansion valve open?

Warning: Ensure power is OFF before starting the procedure

All wiring removed from the PCB

Wait for 10 minutes before proceeding

Resistance measurement in x1 kΩ range (for analog multimeter)

Measurement in diode check mode (for digital multimeter)

Sign off on the power transistor check