Daikin Super Multi NX C-Series User Manual

Control Specification SiE12-411
98 Function and Control
3.12.1 Fully Closing with Power ON
Initialize the electronic expansion valve when turning on the power, set the opening position and
develop pressure equalizing.
3.12.2 Pressure Equalization Control
When the compressor is stopped, open and close the electronic expansion valve and develop
pressure equalization.
3.12.3 Opening Limit
Outline Limit a maximum and minimum opening of the electronic expansion valve in the operating room.
Detail " A maximum electronic expansion valve opening in the operating room: 450 pulses
" A minimum electronic expansion valve opening in the operating room: 75 pulses
The electronic expansion valve is fully closed in the room where cooling is stopped and is
opened with fixed opening during defrosting.
3.12.4 Starting Operation Control / Changing Operation Room
Control the electronic expansion valve opening when the system is starting or the operating
room is changed, and prevent the system to be super heated or moistened.
3.12.5 High Temperature of the Discharge Pipe
When the compressor is operating, if the discharge pipe temperature exceeds a certain value,
open the electronic expansion valve and remove the refrigerant to the low pressure side and
lower discharge temperature.
3.12.6 Oil Recovery Function
Outline The electronic expansion valve opening in the cooling stopped room must be set as to open for
a certain time at a specified interval so that the oil in the cooling stopped room may not be
accumulated.
Detail During cooling operation, every 1 hour continuous operation, the electronic expansion valves in
the operation stopped room must be opened by 80 pulses for specified time.
3.12.7 Gas Pipe Isothermal Control During Cooling
When the units are operating in multiple rooms, detect the gas piping temperature and correct
the electronic expansion valve opening so that the temperature of the gas pipe in each room
becomes identical.
" When the gas pipe temperature > the average gas pipe temperature,
→ open the electronic expansion valve in that room
" When the gas pipe temperature < the average gas pipe temperature,
→ close the electronic expansion valve in that room

Daikin Super Multi NX C-Series Specifications

General

Series	Super Multi NX C-Series
Indoor Units	Wall-mounted, Floor-standing, Cassette
Refrigerant	R32
Control	Remote Control, Wi-Fi Control (Optional)
Power Supply	220-240V, 50Hz
Indoor Unit Noise Level	19dB(A) - 45dB(A)
Outdoor Unit Noise Level	45dB(A) - 60dB(A)
Indoor Unit Weight	8kg - 25kg
Outdoor Unit Weight	35kg - 70kg

Summary

Part 2 Specifications

1. Specifications

1.1 Indoor Units - Cooling Only

Details specifications for Daikin indoor units for cooling-only models.

1.2 Outdoor Units - Cooling Only

Details specifications for Daikin outdoor units for cooling-only models.

1.3 Indoor Units - Heat Pump

Details specifications for Daikin indoor units for heat pump models.

1.4 Outdoor Units - Heat Pump

Details specifications for Daikin outdoor units for heat pump models.

Part 3 Printed Circuit Board Connector Wiring Diagram

1. Printed Circuit Board Connector Wiring Diagram

1.1 Wall Mounted Type 20 / 25 / 35 Class

Wiring diagram for wall-mounted indoor units (20/25/35 class).

1.2 Wall Mounted Type 50 / 60 / 71 Class

Wiring diagram for wall-mounted indoor units (50/60/71 class).

1.3 Duct Connected Type

Wiring diagram for duct-connected indoor units.

1.4 Floor / Ceiling Suspended Dual Type

Wiring diagram for floor/ceiling suspended dual type units.

1.5 Floor Standing Type

Wiring diagram for floor standing indoor units.

1.6 Outdoor Units

Wiring diagram for outdoor units.

Part 4 Function and Control

1.1 Frequency Principle

3.2 Frequency Control

3.6 Freeze-up Protection Control

3.12 Electronic Expansion Valve Control

3.15 Wiring-Error Check

Part 5 System Configuration

2.2 Safety Precautions

Crucial safety guidelines for installation and operation to prevent injury and damage.

2.13 Care and Cleaning

2.14 Troubleshooting

Part 6 Service Diagnosis

1. Caution for Diagnosis

1.1 Troubleshooting with the Operation Lamp

Explains how to interpret the operation lamp's status for error detection.

2. Problem Symptoms and Measures

4. Code Indication on the Remote Controller

Provides a list of error codes displayed on the remote controller and their meanings.

4.1 Error Codes and Description of Fault

Details specific error codes and the associated faults for Daikin units.

5. Troubleshooting

Comprehensive guide for diagnosing and resolving various system faults.

5.3 Indoor Unit PCB Abnormality

Troubleshooting steps for issues related to the indoor unit's printed circuit board.

5.4 Freeze-up Protection Control or High Pressure Control

Diagnosing issues related to freeze-up or high-pressure protection activation.

5.8 Signal Transmission Error (between Indoor and Outdoor Units)

Steps to diagnose and resolve communication errors between indoor and outdoor units.

5.10 Freeze-up Protection Control

Troubleshooting guide for freeze-up protection activation during cooling.

5.11 OL Activation (Compressor Overload)

Diagnosing and resolving compressor overload issues.

5.14 Input Over Current Detection

Troubleshooting steps for detecting and resolving over-current situations.

5.22 Output Over Current Detection

5.23 Insufficient Gas

Part 7 Removal Procedure

1. Outdoor Unit (80 / 90 Class)

1.1 Removal of Outer Panels

1.3 Removal of Electrical Box

1.4 Removal of PCB

1.5 Removal of Fan Motor

1.6 Removal of Electronic Expansion Valve and Thermistor

1.10 Removal of Compressor

2. Outdoor Unit (50 / 52 / 58 / 68 / 75 Class)

2.3 Removal of PCB

2.4 Removal of Fan Motor

2.9 Removal of Compressor