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LG LBUM1081BL User Manual

LG LBUM1081BL
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Ceiling Duct Type
Air Conditioner
SERVICE MANUAL
MODELS: LBNS3061BL LBUS3061BL
LBNK3660BL LBUK3660BL
LBNK3661BL LBUK4260BL
LBNK4260BL LBUK4880BL
LBNK4261BL LBUL6080BL
LBNK4880BL LBUM7280BL
LBNK4881BL LBUM9080BL
LBNL6080BL LBUM1081BL
LBNL6081BL
LBNM7280BL
LBNM7281BL
LBNM9080BL
LBNM9081BL
LBNM1081BL
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LG LBUM1081BL Specifications

General IconGeneral
BrandLG
ModelLBUM1081BL
CategoryAir Conditioner
LanguageEnglish

Summary

Functions

Temperature Sensing and Control

Utilizes thermistor for room temp and controls operation.

Safety and Delay Controls

Includes time delay, auto restart, and hot-start safety features.

Heating Operation Controls

Details on defrost and hot-start functions for heating.

Remote Controller Operation

Operation Mode Selection

Allows selection of Cooling, Heating, Dry, or Auto modes.

Temperature Setting

Adjusts the desired temperature for cooling or heating.

Weekly Program

Enables scheduling operations on a weekly basis.

Product Specifications

Cooling and Heating Capacity

Details of cooling and heating performance for various models.

Air Volume and Refrigerant

Specifications for air volume and refrigerant type/amount.

Unit Dimensions

Indoor Unit Dimensions

Detailed measurements for the indoor unit.

Outdoor Unit Dimensions

Outdoor Unit Measurements

Physical dimensions and types of outdoor units.

Refrigeration Cycle Diagram

Heat Pump Cycle Overview

Visual representation of the refrigeration cycle for heat pumps.

Piping Length and Elevation

Details on pipe size, length limits, and elevation differences.

Wiring Diagrams

Indoor Unit Wiring

Electrical schematic for the indoor unit.

Outdoor Unit Wiring

Electrical schematic for the outdoor unit.

Operation Details

Time Delay and Soft-Dry Operations

Details on safety delay and soft-dry mode functions.

Cooling Mode Operation Logic

Explains operational logic for cooling mode.

Heating Mode and Controls

Heating Mode Operation Logic

Explains operational logic for heating mode.

Hot-Start and Defrost Controls

How hot-start and defrost functions operate.

Troubleshooting and Diagnostics

Self-diagnosis Function Codes

Explains error codes displayed on the remote controller.

Installation Guidelines

Unit Location Selection

Criteria for selecting the best installation locations.

Piping Length Requirements

Specifications for maximum piping length and elevation.

Mounting and Installation Details

Ceiling Mounting and Bolt Locations

Guidance on suspending units and bolt placement.

Remote Controller Installation

Wired Remote Controller Mounting

Procedures for installing the wired remote controller.

Wireless Remote Controller Prep

Battery Installation Procedure

How to insert batteries into the wireless remote.

Electrical Connections

Connecting Indoor and Outdoor Units

Guidelines for connecting indoor and outdoor units.

Power Cord Specifications

Details on power cord type and cross-sectional area.

Electrical Wiring Requirements

Power Supply and Circuit Breaker

Requirements for power supply and circuit breaker selection.

Piping Preparation

Pipe Cutting and Flaring

Steps for cutting, deburring, and flaring pipes.

Piping Connection and Vacuuming

Piping Connection Steps

Connecting pipes and ensuring proper fit.

Vacuum Drying Procedure

Removing air and moisture from the refrigerant lines.

Installation Precautions

Drainage and Unit Gradient

Ensuring proper drainage and unit leveling.

Insulation and Sealing

Thermal Insulation Requirements

Guidelines for insulating pipes and joints.

Test Running

Test Run Precautions

Steps and safety measures for initial unit testing.

Performance Verification

Power Supply and Performance Checks

Verifying power and checking operational performance.

Optional Operations

Two Thermistor System Setup

Configuring the dual thermistor temperature sensing.

Group Control System

Group Control Wiring

Connecting multiple units for group operation.

Cycle Installation and Charging

Piping Installation and Vacuuming

Connecting pipes and performing initial vacuuming.

Cycle Disconnection

Disconnecting Refrigerant Lines

Procedures for safely disconnecting refrigerant lines.

Gas Charging Procedure

Charging Refrigerant

Steps for charging the system with refrigerant.

Cycle Troubleshooting Guide

Temperature and Current Analysis

Analyzing operational parameters for troubleshooting.

Pressure and Refrigeration Checks

Diagnosing issues based on pressure and temperature.

Electronic Parts Troubleshooting

Unit Does Not Operate Troubleshooting

Step-by-step guide for non-operation issues.

Component Troubleshooting

Indoor Fan and Heating Issues

Diagnosing fan and ineffective heating problems.

Wired Remote Controller Issues

Steps to resolve remote controller communication problems.

Electronic Control Device

Main P.C.B Assembly Diagram

Layout and components of the main PCB.

Exploded View and Parts List

Indoor Unit Parts (LBNS3061BL)

List of parts and their numbers for the indoor unit.

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