Daikin Super Multi NX FCQ50C8VEB

Service
Manual
SiBE121021_C
E-Series / F-Series / G-Series
[Applied Models]
● Inverter Multi : Cooling Only
● Inverter Multi : Heat Pump

Daikin Super Multi NX FCQ50C8VEB Specifications

General

Brand	Daikin
Model	Super Multi NX FCQ50C8VEB
Category	Air Conditioner
Language	English

Summary

Part 2 Specifications

1.1 Cooling Only - Indoor Unit

1.2 Cooling Only - Outdoor Unit

1.3 Heat Pump - Indoor Unit

1.4 Heat Pump - Outdoor Unit

Part 3 Printed Circuit Board Connector Wiring Diagram

Part 4 Function and Control

1.1 Temperature Control

1.2 Frequency Principle

1.3 Operation Starting Control

1.12 2-Area INTELLIGENT EYE Operation

1.13 INTELLIGENT EYE Operation

1.14 Inverter POWERFUL Operation

2.1 Drain Pump Control

2.3 Freeze Prevention Control

2.4 Hot Start Control (In Heating Operation Only)

4.2 Frequency Control

4.4 Discharge Pipe Temperature Control

4.6 Freeze-up Protection Control

4.10 Defrost Control

4.12 Electronic Expansion Valve Control

4.13 Malfunctions

Part 6 Service Diagnosis

1. Troubleshooting with LED

Diagnosing issues using LED indicators on indoor and outdoor units.

1.1 Indoor Unit

1.2 Outdoor Unit

2. Problem Symptoms and Measures

Common air conditioner problems and recommended solutions.

3. Service Check Function

Procedures for using service check functions.

4. Code Indication on Remote Controller

Understanding error and warning codes on remote controllers.

4.1 RA Indoor Unit - F(C)TXG, FTXS, ATXS, FVXS, FLK(X)S, FDK(X)S Series

4.2 SA Indoor Unit - FFQ, FCQ, FDBQ, FBQ, FHQ Series

4.3 Outdoor Unit

5. Troubleshooting for RA Indoor Unit - F(C)TXG, FTXS, ATXS, FVXS, FLK(X)S, FDK(X)S Series

Detailed troubleshooting for RA Indoor Units.

5.1 Indoor Unit PCB Abnormality

Diagnosing and resolving indoor unit PCB abnormalities.

5.2 Freeze-up Protection Control or Heating Peak-cut Control

Troubleshooting freeze-up or heating peak-cut control issues.

5.3 Fan Motor or Related Abnormality

Troubleshooting fan motor and related component issues.

5.4 Thermistor or Related Abnormality (Indoor Unit)

Diagnosing indoor unit thermistor problems.

5.6 Signal Transmission Error (between Indoor Unit and Outdoor Unit)

Diagnosing signal transmission errors between units.

6. Troubleshooting for SA Indoor Unit - FFQ, FCQ, FDBQ, FBQ, FHQ Series

Detailed troubleshooting for SA Indoor Units.

6.1 Indoor Unit PCB Abnormality

Diagnosing and resolving indoor unit PCB abnormalities.

6.2 Drain Water Level System Abnormality

Troubleshooting drain water level system issues.

6.3 Fan Motor or Related Abnormality

Troubleshooting fan motor and related component issues.

6.5 Drain System Abnormality

Troubleshooting drain system abnormalities.

6.6 Thermistor or Related Abnormality

Troubleshooting thermistor issues.

6.7 Remote Controller Thermistor Abnormality

Troubleshooting remote controller thermistor issues.

6.8 Signal Transmission Error (between Indoor Unit and Remote Controller)

Troubleshooting signal transmission errors between units and remote.

6.9 Signal Transmission Error (between MAIN Remote Controller and SUB Remote Controller)

7. Troubleshooting for Outdoor Unit

Troubleshooting common outdoor unit problems.

7.1 Anti-icing Function

Troubleshooting anti-icing function issues.

7.2 Outdoor Unit PCB Abnormality

Diagnosing and resolving outdoor unit PCB abnormalities.

7.3 OL Activation (Compressor Overload)

Troubleshooting compressor overload (OL Activation).

7.4 Compressor Lock

Troubleshooting compressor lock conditions.

7.5 DC Fan Lock

Troubleshooting DC fan lock issues.

7.6 Input Overcurrent Detection

Troubleshooting input overcurrent detection.

7.7 Discharge Pipe Temperature Control

Troubleshooting discharge pipe temperature control issues.

7.8 High Pressure Control in Cooling

7.9 Compressor Sensor System Abnormality

Troubleshooting compressor sensor system abnormalities.

7.10 Position Sensor Abnormality

7.12 Thermistor or Related Abnormality (Outdoor Unit)

Troubleshooting outdoor unit thermistor issues.

7.15 Output Overcurrent Detection

Troubleshooting output overcurrent detection.

7.16 Refrigerant Shortage

Troubleshooting refrigerant shortage issues.

7.17 Low-voltage Detection or Over-voltage Detection

Troubleshooting voltage detection problems.

7.18 Signal Transmission Error (on Outdoor Unit PCB)

Troubleshooting signal transmission errors on outdoor unit PCB.

8. Check

Procedures for checking various components.

8.1 Thermistor Resistance Check

How to check thermistor resistance values.

8.2 Fan Motor Connector Check

8.5 Electronic Expansion Valve Check

8.8 Inverter Checker Check

8.9 Rotation Pulse Check on the Outdoor Unit PCB

Part 7 Removal Procedure

1. Outdoor Unit - 5075 Class

Procedures for removing components from 50-75 class outdoor units.

1.1 Removal of Outer Panels

Steps for removing outer panels.

1.2 Removal of Electrical Box

Steps for removing the electrical box.

1.3 Removal of PCBs

Steps for removing printed circuit boards (PCBs).

1.4 Removal of Outdoor Fan Fan Motor

Steps for removing the outdoor fan or fan motor.

1.5 Removal of Sound Blankets

1.6 Removal of Coils Thermistors

1.8 Removal of Four Way Valve

1.9 Removal of Compressor

Steps for removing the compressor.

2. Outdoor Unit - 8090 Class

Procedures for removing parts from 80/90 class outdoor units.

2.1 Removal of Outer Panels

Steps for removing outer panels.

2.2 Removal of Electrical Box

Steps for removing the electrical box.

2.3 Removal of PCBs

Steps for removing printed circuit boards (PCBs).

2.4 Removal of Fan Motor

Steps for removing the fan motor.

2.5 Removal of Coils Thermistors

2.6 Removal of Sound Blankets

2.7 Removal of Compressor

Part 8 Trial Operation and Field Settings

1. Pump Down Operation

Procedure for pump down operation before relocation or disposal.

2. Forced Operation

How to perform forced cooling or heating operations.

3. Wiring Error Check Function

Function to check and correct wiring errors.

4. Trial Operation

Steps for performing trial operation.

5. Field Settings