LG LMN079HVT User Manual

MULTI
F
MAX
MULTI
F
OUTDOOR UNIT
INSTALLATION MANUAL
Multi-Zone Heat Pump Systems
1.5 to 5 Tons
Dual and Tri-Zone
Multi F
Quad-Zone
Multi F
Eight-Zone
Multi F MAX

LG LMN079HVT Specifications

General

Model	LMN079HVT
SEER	22
HSPF	10
Refrigerant	R410A
Indoor Unit Weight	17.6 lbs
Type	Mini Split
Power Supply	1 Phase, 60Hz
Noise Level (Indoor)	19 dB
Operating Temperature (Heating)	75°F

Summary

SAFETY INSTRUCTIONS

SAFETY INSTRUCTIONS (continued)

Wiring Safety

Crucial safety measures for electrical connections.

Operation Safety

ELECTRICAL DATA

Multi F and Multi F MAX Outdoor Units Electrical Data

Electrical parameters for different models.

GENERAL INSTALLATION GUIDELINES

Location for Outdoor Unit

Selecting the Best Location for the Outdoor Unit

Criteria for optimal outdoor unit placement.

GENERAL INSTALLATION GUIDELINES (continued)

Outdoor Unit Service Access and Allowable Clearances

Allowable Clearances for Outdoor Unit

Allowable Clearances for Outdoor Unit (continued)

Rigging Instructions / Platform Instructions for Outdoor Unit

Rigging and Lifting Instructions

Procedures for safely rigging and lifting the unit.

Location for Multi F MAX Branch Distribution Units

Selecting the Best Location for the Branch Distribution (BD) Unit

Criteria for optimal BD unit placement.

Piping Preparation

Creating a Flare Fitting

Procedure for making proper flare connections.

Piping Preparation (continued)

Tightening the Flare Connections

REFRIGERANT PIPING CONNECTIONS

Device Connection Limitations

Piping Length and Elevation Limitations

Maximum allowable pipe lengths and elevation differences.

REFRIGERANT PIPING CONNECTIONS (continued)

Multi F MAX Piping Length and Elevation Limitations

Specific length and elevation limits for MAX systems.

Multi F Outdoor Unit to Indoor Unit Piping Connections

Multi F MAX Outdoor Unit System Piping Connections

Multi F MAX System Piping Connections, continued.

REFRIGERANT PIPING PREPARATION

Flushing the Refrigerant Piping

Flushing the Refrigerant Piping Procedure

REFRIGERANT PIPING PREPARATION (continued)

Leak Test and Vacuum Procedures

Essential steps for system leak testing and evacuation.

Leak Test Procedure, continued.

Continuation of leak test steps and observations.

Vacuum Procedure

Step-by-step process for system vacuum evacuation.

Leak Test

Procedure for testing the system for leaks.

Essential Points for Leak Testing

Key considerations for successful leak testing.

Before the Leak Test

Pressure Gauge Hookup

Leak Test Procedure

Detailed steps for performing the leak test.

REFRIGERANT CHARGE

Multi F Systems Refrigerant Charge Calculation

Formula and data for calculating refrigerant charge for Multi F.

REFRIGERANT CHARGE (continued)

Multi F MAX Systems Refrigerant Charge Calculation

Formula and data for calculating refrigerant charge for Multi F MAX.

Charging the Refrigerant

Procedure for safely charging the system with refrigerant.

WIRING

General Wiring Information

Power Supply and Wiring Specifications

Requirements for power supply and wiring.

WIRING (continued)

General Communication Cable Specifications

Outdoor Unit Wiring Connection Guidelines

Power Wiring and Communications Cable Connections

Outdoor Unit Wiring Connection Guidelines, continued.

Connecting Power and Communications Cables to the Outdoor Unit

Step-by-step guide for connecting cables to the outdoor unit.

Power Wiring and Communications Cable Connections (continued)

Connecting Power and Communications Cables to the Outdoor Unit, continued.

Additional steps for connecting cables to the outdoor unit.

Connecting Power and Communications Cables to Indoor Units

Connecting Power and Communications Cables to the Branch Distributor (BD) Unit (Multi F MAX Systems Only)

TEST RUN

Test Run Overview

General steps for performing a system test run.

Before the Test Run

Test Run Procedure

Detailed steps for operating and checking the system.

DIP SWITCH SETTINGS

Outdoor Unit DIP Switch Settings

Overview and function of outdoor unit DIP switches.

DIP SWITCH SETTINGS (continued)

Location of DIP Switches and Forced Cooling Function

Wiring Error Check

Power Consumption with Mode Lock

Mode Lock Settings

Reducing Power Consumption

Night Quiet Mode Settings

Night Quiet Mode with Mode Lock

TROUBLESHOOTING

Self Diagnosis Functions

Utilizing built-in diagnostic capabilities.

LG Monitoring View (LGMV) Diagnostic Software

Using LGMV software for system monitoring and troubleshooting.

TROUBLESHOOTING (continued)

LG Monitoring View (LGMV) Software and Cable - Continued

Further details on LGMV software features and data.

LG SIMS Diagnostic System

LG SIMS App Screens

Error Codes Overview

Introduction to system error codes.

Error Codes

Troubleshooting Using Error Codes

How to interpret and use error codes for diagnosis.

Decoding the Error Display

CAUTIONS FOR REFRIGERANT LEAKS

Refrigerant Leak Introduction and Safety

Overview of refrigerant safety standards and concentration limits.

Refrigerant Concentration Limit (RCL) Calculations

MULTI F REFRIGERANT CHARGE WORKSHEET

Multi F Outdoor Unit Factory Charge

Multi F Refrigerant Charge Calculation Formula

Formula for calculating additional refrigerant charge.

Multi F Outdoor Unit Piping Specifications

Piping data needed for charge calculation.

MULTI F MAX REFRIGERANT CHARGE WORKSHEET

Multi F MAX Outdoor Unit Factory Charge

Multi F MAX Refrigerant Charge Calculation Formula

Formula for calculating additional refrigerant charge for MAX systems.

Multi F MAX Outdoor Unit Piping Specifications

Piping data for MAX system charge calculation.