LG MULTI V ARUN072BTE4 - User Manual

Service Manual
Heat Pump and Heat Recovery
Variable Refrigerant Flow Outdoor Units
6.0 to 42.0 Tons
SM-MultiV-IV-Air-Outdoor-Units-4-15
Heat Pump
208 / 230V, 60Hz, 3-phase
and
460V, 60Hz, 3-phase
ARUN072BTE4 / ARUN072DTE4
ARUN096BTE4 / ARUN096DTE4
ARUN121BTE4 / ARUN121DTE4
ARUN144BTE4 / ARUN144DTE4
ARUN168BTE4 / ARUN168DTE4
ARUN192BTE4 / ARUN192DTE4
ARUN216BTE4 / ARUN216DTE4
ARUN240BTE4 / ARUN240DTE4
ARUN264BTE4 / ARUN264DTE4
ARUN288BTE4/ ARUN288DTE4
ARUN313BTE4 / ARUN313DTE4
ARUN337BTE4 / ARUN337DTE4
ARUN312BTE4 / ARUN312DTE4
ARUN336BTE4 / ARUN336DTE4
ARUN360BTE4 / ARUN360DTE4
ARUN384BTE4 / ARUN384DTE4
ARUN408BTE4 / ARUN408DTE4
ARUN432BTE4 / ARUN432DTE4
ARUN456BTE4 / ARUN456DTE4
ARUN480BTE4 / ARUN480DTE4
ARUN504BTE4 / ARUN504DTE4
Heat Recovery
208 / 230V, 60Hz, 3-phase
and
460V, 60Hz, 3-phase
ARUB072BTE4 / ARUB072DTE4
ARUB096BTE4 / ARUB096DTE4
ARUB121BTE4 / ARUB121DTE4
ARUB144BTE4 / ARUB144DTE4
ARUB168BTE4 / ARUB168DTE4
ARUB192BTE4 / ARUB192DTE4
ARUB216BTE4 / ARUB216DTE4
ARUB240BTE4 / ARUB240DTE4
ARUB264BTE4 / ARUB264DTE4
ARUB288BTE4 / ARUB288DTE4
ARUB313BTE4 / ARUB313DTE4
ARUB337BTE4 / ARUB337DTE4
ARUB312BTE4 / ARUB312DTE4
ARUB336BTE4 / ARUB336DTE4
ARUB360BTE4 / ARUB360DTE4
ARUB384BTE4 / ARUB384DTE4
ARUB408BTE4 / ARUB408DTE4
ARUB432BTE4 / ARUB432DTE4
ARUB456BTE4 / ARUB456DTE4
ARUB480BTE4 / ARUB480DTE4
ARUB504BTE4 / ARUB504DTE4

Summary

Safety Precautions

Installation Safety

Safety warnings and cautions for unit installation, covering fire, electrical shock, and physical injury risks.

Wiring Safety

Safety precautions related to electrical wiring, including high voltage, grounding, and connections, to prevent injury or death.

Operation Safety

Safety guidelines for operating the unit, covering electrical hazards, environmental factors, and proper procedures to avoid damage.

Unit Nomenclature

Outdoor Units (ODU)

Explains the coding system for identifying LG Multi V Outdoor Units (ODU) based on family, type, capacity, ratings, etc.

Heat Recovery Units (HRU)

Details the nomenclature for LG Multi V Heat Recovery Units (HRU), including family, ports, and series number.

Basic Controls

Normal Operation

Describes normal operation functions for compressor, fan, and EEVs in cooling and heating modes.

Compressor Control

Explains how fuzzy logic is used for stable compressor performance by maintaining evaporating and condensing temperatures.

Master-Slave Unit EEVS

Details the control logic for Main EEV, Subcooling EEV, and Vapor Injection for master-slave outdoor units.

Special Controls

Oil Return Control

Explains the oil return operation to recover and return oil to the compressor in cooling and heating modes.

Defrost Control

Details the component operations during defrost control to eliminate ice and restore heat exchanger performance.

Partial Defrost

Describes partial defrost operation that defroths parts of the heat exchanger separately for continuous heating mode.

Stop Operation

Outlines stop operation control for cooling and heating modes, and the oil equalizing control for compressors.

Protection Controls

Pressure Protection Control

Details high and low pressure protection controls for compressor and fan in cooling and heating modes.

Discharge Temperature Control

Explains discharge temperature control actions for compressor and EEVs based on temperature ranges.

Inverter Protection Control

Outlines inverter protection control based on AC input and compressor current limits in cooling and heating modes.

Phase Detection

Describes phase detection errors and their corresponding error numbers for three-phase power systems.

Pressure Switch

Mentions the pressure sensor switch on the Main PCB and its function.

Other Controls

Initial Setup

Guides through the four initial setup steps, including factory settings, communication checks, and PCB error checks.

Indoor Unit Auto Addressing

Details the process of indoor unit auto addressing using the red address button and the Main PCB LED display.

Setting the Functions

Explains how to select modes, functions, options, and values using buttons and DIP switches for system configuration.

Emergency Operation

Describes automatic and manual emergency operation procedures for inverter compressor failures.

Overview

1. Function Description
2. Usage Features
3. Maintenance Features

The LG Multi V IV is a series of variable refrigerant flow (VRF) outdoor units designed for both heat pump and heat recovery applications, offering a range of capacities from 6.0 to 42.0 tons. These units are engineered to provide efficient comfort cooling and heating for various commercial and residential settings.

Function Description

The Multi V IV system operates on a sophisticated control logic to ensure stable and efficient performance. At its core, the system utilizes fuzzy logic for compressor control, maintaining optimal evaporating temperatures (Te) during cooling and condensing temperatures (Tc) during heating. This intelligent control adjusts compressor operation based on the cooling and heating load, ensuring that the system operates at its most efficient point.

The outdoor units are available in two main types: Heat Pump (ARUN series) and Heat Recovery (ARUB series). Heat pump units provide either cooling or heating to all connected indoor units simultaneously. Heat recovery units, on the other hand, offer the flexibility of simultaneous cooling and heating to different indoor units, making them ideal for buildings with diverse thermal demands.

Key components like the Main Electronic Expansion Valve (EEV) and Subcooling EEV are precisely controlled. The Main EEV uses fuzzy logic to maintain a stable degree of superheat at the evaporator outlet during heating, while the Subcooling EEV maintains a stable degree of subcool at the subcooler outlet during cooling. This precise control of refrigerant flow is crucial for maximizing efficiency and preventing issues like liquid floodback to the compressor.

The system incorporates advanced protection controls to safeguard its components and ensure reliable operation. These include pressure protection controls for both high and low pressures in cooling and heating modes, discharge temperature control to prevent compressor overheating, and inverter protection control to manage current draw and prevent damage to the inverter compressor.

Usage Features

The Multi V IV system offers several features designed to enhance user experience and system flexibility:

• Initial Setup: The system has a straightforward initial setup process, involving power-on sequences that display system information such as master/slave unit codes, total system capacity, system type (heat pump or heat recovery), electrical requirements, and model type on the PCB LED.
• Auto Addressing: A crucial feature for installation, auto-addressing simplifies the process of assigning addresses to indoor units. By holding a dedicated address button on the Main PCB, the system automatically detects and assigns addresses to all connected indoor units, which are then displayed on their respective wired remote controllers. This eliminates the need for manual addressing, reducing installation time and potential errors.
• Emergency Operation (Backup Function): In the event of an inverter compressor failure, the system can continue to operate in an emergency mode. This automatic backup function allows the system to run with reduced capacity, ensuring continued comfort until repairs can be made. A manual backup function is also available, allowing technicians to disable a defective compressor via DIP switch settings and maintain system operation.
• Mode Control: The system provides flexible mode control, allowing users to select between cooling and heating operations. In heat recovery systems, simultaneous cooling and heating are possible, catering to varied occupant preferences within different zones of a building.
• Night Low Sound Function: For installations in noise-sensitive areas, the Multi V IV includes a night low sound function that can be activated to reduce outdoor unit operating noise during specific hours, minimizing disturbance to surrounding environments.
• Vacuum Mode / Static Pressure Compensation Mode: These modes are essential for proper installation and commissioning. Vacuum mode assists in evacuating the refrigerant lines, while static pressure compensation mode helps optimize fan performance based on external static pressure.
• Cycle Data View: Technicians can access and view various cycle data parameters, providing valuable insights into system performance and aiding in troubleshooting.

Maintenance Features

The Multi V IV is designed with maintenance in mind, incorporating features that facilitate diagnostics and servicing:

• Oil Return Control: To ensure the longevity and efficiency of the compressors, the system features an automatic oil return control. This function periodically recovers any oil that has accumulated in the refrigerant piping and returns it to the compressors, preventing oil starvation and maintaining optimal lubrication. The oil return operation is initiated when oil sensors detect low oil levels and runs for a set duration.
• Defrost Control / Partial Defrost Control: In heating mode, ice can accumulate on the outdoor unit's heat exchanger, reducing efficiency. The system's defrost control automatically melts this ice, restoring performance. Partial defrost control further enhances this by defrosting sections of the heat exchanger separately, allowing heating operation to continue uninterrupted during the defrost cycle.
• Fault Detection Diagnosis (FDD) Code: The system provides detailed fault codes that are displayed on the PCB LED, enabling quick and accurate identification of system malfunctions. These codes, along with the Multi V ITR Result Report, guide technicians through troubleshooting steps, reducing diagnostic time.
• Error Code Tables: Comprehensive error code tables are provided in the service manual, detailing various system errors, their causes, and recommended solutions. This resource is invaluable for technicians in diagnosing and resolving issues efficiently.
• Pressure Switch: The main PCB incorporates a pressure sensor switch that monitors system pressures, providing critical data for protection controls and diagnostics.
• Phase Detection: For three-phase power systems, the unit includes phase detection to ensure correct wiring. If one or more phases are missing, the system displays specific error codes, indicating a power supply issue.
• Refrigerant Auto Charge: This feature simplifies the refrigerant charging process, ensuring the correct amount of refrigerant is added to the system, which is crucial for optimal performance and efficiency.
• Pump Down / Pump Out: These functions are essential for refrigerant management during servicing. Pump down allows for the collection of refrigerant into the outdoor unit, while pump out facilitates the removal of refrigerant from the system for maintenance or repair.
• Forced Oil Return / Forced Defrost: These manual override functions allow technicians to initiate oil return or defrost cycles as needed, aiding in specific maintenance procedures or troubleshooting scenarios.

The LG Multi V IV system is a robust and intelligent solution for climate control, offering advanced operational features and comprehensive maintenance tools to ensure reliable and efficient performance over its lifespan.

LG MULTI V ARUN072BTE4 Specifications