Daikin VRV Aurora Series Air Conditioner RXLQ192TBTJA

Warning: This check requires trained personnel with PPE!

Enter the superheating degree of suction gas

Is the compressor discharge gas temperature higher?

Does the electronic expansion valve turn open?

Does the unit not demonstrate cooling/heating capacity?

Sign off on the refrigerant shortage check

CHECKING EMERSON ULTRATECHTM ECM MOTORS

The FXTQ-TA and FXTQ-TB models utilize an Emerson, 4-wire variable speed ECM blower motor.

The ECM blower motor provides constant CFM.

The motor is a serially communicating variable speed motor. Only four wires are required to control the motor: +Vdc, Common, Receive, and Transmit.

The +Vdc and Common wires provide power to the motor's low voltage control circuits.

General Checks / Considerations

1. Check power supply to the air handler or modular blower. Ensure power supply is within the range specified on rating plate.

2. Check motor power harness. Ensure wires are continuous and make good contact when seated in the connectors. Repair or replace as needed.

3. Check motor control harness. Ensure wires are continuous and make good contact when seated in the connectors. Repair or replace as needed.

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

Is there continuity between the said terminal blocks?

If there is no continuity, the transmission wiring may have broken wires.

Conduct continuity checks between the transmission wiring terminal blocks F1 and F2 of the unified ON/OFF controller

Conduct continuity checks between the outdoor-outdoor unit terminal of the outdoor unit E, D, C

Procedure for checking indoor-outdoor unit transmission wiring for broken wires

Warning: This procedure requires trained personnel with PPE!

Enter the high pressure reading

Is overload control conducted causing insufficient cooling capacity?

Enter the superheating degree of suction gas

Is the compressor lower in discharge pipe temperature despite of pressure loads?

Enter the subcooling degree of condensate

In heating, is the temperature of discharge air through the subcooled section lower?

Sign off on the refrigerant overcharge check

Resistance between Vcc and U phase

Resistance between Vcc and V phase

Resistance between Vcc and W phase

Resistance between GND and U phase

Resistance between GND and V phase

Resistance between GND and W phase

Values are balanced within the range of ± 20%