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KOREL M2OC-18HFN8-Q User Manual

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SERVICE MANUAL
TEHNIČKI PRIRUČNIK
KOREL AIRCONDITIONER
EUROPE MARKET
SUPER DC INVERTER MULTI TYPE
M2OG-14HFN8-Q = X
M2OC-18HFN8-Q = K20C-18FN8 = K20C-18HFN8
M2OD-18HFN8-Q =x
M3OF-21HFN8-Q = K30-21FN8
M3OF-27HFN8-Q = K30-27FN8 = K30-37HFN8
M3OE-27HFN8-Q = x
M4OB-36HFN8-Q = K40-36HFN8
M5OD-42HFN8-Q = K50-42FN8
M4OE-28HFN8-Q = X
DC MULTI OUTDOOR UNITS

Table of Contents

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KOREL M2OC-18HFN8-Q Specifications

General IconGeneral
RefrigerantR410A
Outdoor Unit Weight42 kg
Air Flow (Indoor Unit)850 m³/h
Operating Temperature (Cooling)18-43 °C
Power Supply220V, 50Hz
Cooling Capacity18000 BTU/h

Summary

General Outdoor Unit Information

Key Features

Power Relay Control

Controls the operation of the outdoor unit via power relays.

Low Noise Air Flow System

Enhances quiet operation through optimized airflow design.

Hydrophilic Aluminum Fin

Improves heating efficiency with a water-attracting surface.

4-Way Valve Control

Manages refrigerant flow for heating and cooling modes.

Anti-Rust Cabinet

Protects the unit from corrosion and environmental damage.

Valve Protection Cover

Shields valves from debris and moisture.

Discharge Pipe Temperature Protection

Monitors and protects against high discharge pipe temperatures.

Outdoor Unit Dimensions

Refrigeration Cycle Diagrams

4.1 Inverter 1 Drive 2 Type Circuit

Illustrates the refrigeration flow for a 1-to-2 system.

4.2 Inverter 1 Drive 3 Type Circuit

Details the refrigerant path for a 1-to-3 system.

4.3 Inverter 1 Drive 4 Type Circuit

Shows the refrigeration circuit for a 1-to-4 system.

4.4 Inverter 1 Drive 5 Type Circuit

Depicts the refrigerant flow for a 1-to-5 system.

Model Wiring Diagrams

M2OC-18HFN8-Q Wiring

Electrical connection diagram for the M2OC-18HFN8-Q model.

M2OG-14HFN8-Q Wiring

Electrical connection diagram for the M2OG-14HFN8-Q model.

M2OD-18HFN8-Q Wiring

Electrical connection diagram for the M2OD-18HFN8-Q model.

M3OE-27HFN8-Q Wiring

Electrical connection diagram for the M3OE-27HFN8-Q model.

M3OF-21HFN8-Q & M3OF-27HFN8-Q Wiring

Wiring diagrams for M3OF-21HFN8-Q and M3OF-27HFN8-Q models.

M4OE-28HFN8-Q Wiring

Electrical connection diagram for the M4OE-28HFN8-Q model.

M4OB-36HFN8-Q Wiring

Electrical connection diagram for the M4OB-36HFN8-Q model.

M5OD-42HFN8-Q Wiring

Electrical connection diagram for the M5OD-42HFN8-Q model.

Indoor Unit Combination Tables

M2OG-14HFN8-Q Combinations

Table showing indoor unit combinations for M2OG-14HFN8-Q.

M2OC/M2OD-18HFN8-Q Combinations

Indoor unit combinations for M2OC/M2OD-18HFN8-Q models.

M3OE-21HFN1-Q Combinations

Indoor unit combinations for M3OE-21HFN1-Q model.

M3OE/M3OF-27HFN8-Q Combinations

Unit combinations for M3OE/M3OF-27HFN8-Q models.

M4OE-28HFN8-Q Combinations

Indoor unit combinations for M4OE-28HFN8-Q model.

M4OB-36HFN8-Q Combinations

Indoor unit combinations for M4OB-36HFN8-Q model.

M5OD-42HFN8-Q Combinations

Indoor unit combinations for M5OD-42HFN8-Q model.

Outdoor Unit Sound Levels

Installation Procedures

8.1 Wrench Torque Sheet

Specifies torque values for installation fittings.

8.2 Connecting the Cables

Guidelines for selecting and connecting power cables.

8.3 Pipe Length and Elevation

Details maximum piping lengths and height differences.

8.4 First-Time Installation

Procedures for initial system setup, leak testing, and evacuation.

8.4 Air Purging with Vacuum Pump

Step-by-step guide for removing air from the system.

8.5 Adding Refrigerant After Long Operation

Procedure for recharging refrigerant in an operational system.

8.6 Re-installation: Collecting Refrigerant

Steps to recover refrigerant before indoor unit repair.

8.6 Re-installation: Collecting Refrigerant (Cont.)

Detailed procedure for collecting refrigerant into the outdoor unit.

8.7 Re-installation: Evacuation

Procedure for evacuating the entire system before outdoor unit repair.

8.7 Re-installation: Evacuation (Cont.)

Detailed steps for system evacuation.

8.7 Refrigerant Charging

Procedure for charging the system with refrigerant.

Electronic Control System

9.1 Abbreviations

Definitions for technical abbreviations used in control functions.

9.2 Electric Control Working Environment

Specifications for operating voltage, frequency, and current.

9.3 Outdoor Unit Digital Display

Explains the functions of the outdoor unit's digital display tube.

9.4 Outdoor Unit Point Check Function

How to check unit status using the outdoor PCB switch.

9.5 Protection Mechanisms

Overview of various system protection features.

9.5 Protection Mechanisms (Cont.)

Details on compressor, communication, and condenser protection.

9.5 Protection Mechanisms (Cont.)

Explains anti-freezing, oil return, and ambient temperature protections.

Troubleshooting Guide

10.1 Indoor Unit Error Codes

Explains error codes for indoor unit malfunctions.

10.1 Indoor Unit Error Codes (Cont.)

Lists error codes for different indoor unit types.

10.2 Outdoor Unit Error Codes

Explains error codes displayed by the outdoor unit.

10.3 Troubleshooting Steps

General troubleshooting procedures for common issues.

10.3.1.1 Indoor EEPROM Malfunction

Steps to diagnose and resolve indoor EEPROM errors.

10.3.1.2 Indoor/Outdoor Communication Error

Flowchart for troubleshooting communication failures.

10.3.1.3 Indoor Fan Speed Out of Control

Procedure for diagnosing indoor fan speed issues.

10.3.1.4 Temperature Sensor Errors

Steps to check for open or short circuits in sensors.

10.3.1.5 Water-Level Alarm Malfunction

Troubleshooting guide for water-level alarm issues.

10.3.1.6 E6 PFC Module Protection

Diagnostic steps for PFC module protection errors.

10.3.1.7 Indoor PCB & Display Board Communication Error

Troubleshooting communication issues between PCBs.

10.3.1.8 Inverter Compressor Drive Malfunction (P4)

Troubleshooting for compressor drive errors.

10.3.3.1 Outdoor EEPROM Malfunction (ODU E0)

Steps to diagnose and resolve outdoor EEPROM errors.

10.3.3.2 IPM & Outdoor Main Board Communication Malfunction (ODU E3)

Troubleshooting communication between IPM and outdoor main boards.

10.3.3.3 Voltage Protection (ODU E5)

Diagnostic steps for voltage protection issues.

10.3.3.4 Outdoor Fan Speed Out of Control (E8)

Procedure for diagnosing outdoor fan speed problems.

10.3.3.5 High Pressure Protection (ODU P1)

Troubleshooting for high pressure protection in specific models.

10.3.3.6 Low Pressure Protection (ODU P2)

Troubleshooting for low pressure protection in specific models.

10.3.3.7 Compressor Current Protection (ODU P3)

Steps to diagnose compressor current overload protection.

10.3.3.8 Compressor Discharge Temperature Protection (ODU P4)

Troubleshooting for compressor discharge temperature protection.

10.3.3.9 High Condenser Temperature Protection (ODU P5)

Diagnostic steps for high condenser temperature protection.

10.3.3.10 IPM Module Protection (ODU P6)

Troubleshooting for IPM module protection issues.

10.3.3.11 Operation Failure

Troubleshooting cooling/heating operation failures.

10.3.3.12 Heat Exchanger Frosting/Warming

Diagnosing frosting or warming issues in heat exchangers.

Main Component Checks

1. Temperature Sensor Checking

Procedure for measuring temperature sensor resistance.

Compressor Resistance Check

IPM Module Continuity Test

4-Way Valve Test

EXV Coil Resistance Check

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