LG LMAN187HVT - User Manual

Multi Air Conditioner
SVC MANUAL(General)
MODEL : Multi-Inverter Type
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
Internal Use Only
http://biz.lgservice.com

Summary

Part 1 General Information

1. Safety Precautions

Instructions and warnings to prevent injury and property damage during repair and operation.

2. Model Line Up

Details on indoor and outdoor unit models, capacities, and chassis types for the multi-inverter system.

3. Nomenclature

Explanation of coding systems for indoor, outdoor, and branch distributor units.

Part 2 Functions & Controls

1. List of Functions & Accessory

Overview of applied functions and accessories for various indoor unit types.

2. Air flow

Details on airflow direction control, swing patterns, and airflow step settings.

3. Air purifying

Description of the PLASMA Air Purifying System and its operation.

4. Installation Functions

Procedure for setting the E.S.P. (External Static Pressure) for installation.

5. Reliability

Explanation of Hot start, Self-diagnosis, and Soft dry operation modes.

6. Convenience Functions & Controls

Details on operations like cooling/heating, auto cleaning, auto operation, and timers.

7. Special Function & KIT

Information on Low Ambient control, Space control, and Auto Elevation Grille.

Part 3 Basic Control

1. Normal operation

Basic principles for controlling compressor rpm and fan speed via IPM.

2 Compressor control

Explanation of compressor control methods using fuzzy logic and inverter linear control.

3. EEV( Electronic Expansion Valve) control

Details on EEV operation using fuzzy and PI control for superheat management.

4. Oil return control

Operation of compressor oil recovery during various cycle stages.

5. Defrost control

How defrost operation eliminates ice and recovers heat exchanger performance.

6. Protection control

High pressure, low pressure, discharge temperature, and input current protection controls.

Part 4 Test Run

1. Check before Test Run

Pre-test checks including refrigerant leakage, valve status, and insulation resistance.

2. Test Run Flow chart

Graphical representation of the steps for conducting a test run.

3. Test Running

Procedures and precautions for performing test runs on different unit types.

Part 5 Trouble Shooting

1. Self-diagnosis Function

Explanation of error codes and indicators for indoor and outdoor units.

2. Pump Down

Procedure for gathering refrigerant into the ODU for leakage tests or replacement.

3. Evacuation

Steps for evacuating the system to remove air and moisture using a vacuum pump.

4. Gas Charging

Procedure for charging refrigerant into the system after evacuation.

5. Cycle Part

Analysis of issues related to temperature difference and refrigerant pressure in the cycle.

6. Electronic Parts

Troubleshooting for product not operating, remote control issues, and component failures.

7. Troubleshooting Outdoor Error

Detailed error codes and troubleshooting steps for outdoor unit malfunctions.

Part 6 Service Order

1. PCB Service Order

Step-by-step guide for replacing the PCB in the control box.

LG LMAN187HVT Specifications

General

Phase	1
Refrigerant	R410A
Wi-Fi Capable	Yes
Inverter Technology	Yes
Cooling Capacity	18000 BTU/h
Voltage	208/230V
Operating Temperature (Cooling)	43°C
Operating Temperature (Heating)	-15°C to 24°C
Warranty	5 Year Limited Compressor, 1 Year Parts