LG THERMA V User Manual

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www.lg.com

P/NO : MFL69676301

Please read this manual carefully before operating

your set and retain it for future reference.

(Air-to-Water Heat Pump)

Original instruction

OWNER’S MANUAL

AIR

CONDITIONER

ENGLISH

ITALIANO

Table of Contents

Other manuals for LG THERMA V

Installation Manual277 pages

Questions and Answers:

B
bochoaSep 5, 2025
Why is my LG Air Conditioner's temperature between return and supply line too high and what to do?
- K
  Kristina ChoiSep 5, 2025
  If the temperature between the return and supply line is too high in your LG Air Conditioner, it indicates a disturbance in the water flow. Try the following: 1. Check the heating system to make sure the circulation pump is working and all valves and flaps are correctly opened or closed. 2. Clean the strainer. 3. Fill the system to the correct pressure (1.5–2 bar). 4. Vent the system.
K
Kimberly AlexanderSep 7, 2025
What to do if my LG Air Conditioner has exceeded high pressure in space heating mode?
- G
  Gregory MooreSep 7, 2025
  If your LG Air Conditioner displays an 'Exceeded High Pressure' error in space heating mode, it's likely due to insufficient water flow through the condenser. Here are the steps you can take to address this: 1. Check the heating system to ensure the circulation pump is working and that all valves and flaps are correctly opened or closed. 2. Clean the strainer if it is blocked. 3. Fill the system to the correct pressure (min. 1.5–2 bar). 4. Vent the system.
I
irobertsonSep 8, 2025
What to do if my LG Air Conditioner has exceeded high pressure in DHW mode?
- A
  Andrea GriffinSep 8, 2025
  If your LG Air Conditioner shows an 'Exceeded High Pressure' error in DHW mode, the issue is likely insufficient water flow through the condenser. You can try the following: 1. Check the heating system to ensure the circulation pump is working and that all valves and flaps are correctly opened or closed. 2. Clean the strainer if it is blocked. 3. Fill the system to the correct pressure (min. 1.5–2 bar). 4. Vent the system.
K
Kevin GreenSep 10, 2025
What causes insufficient heating of DHW in my LG Air Conditioner and how to fix it?
- J
  Jason BakerSep 10, 2025
  If your LG Air Conditioner can't heat the DHW above the minimal value, it may be due to insufficient water flow through the condenser or the sensor not being in the right place. Try these solutions: 1. Check the heating system to ensure the circulation pump is working and all valves and flaps are correctly opened/closed. 2. Clean the strain. 3. Fill out the system (1.5–2 bar). 4. Vent the system. 5. Check if the sensor is in its designated place.

LG THERMA V Specifications

General

Type	Air-to-Water Heat Pump
Refrigerant	R32
Operating Temperature Range (Heating)	-25°C to 35°C
Power Supply	220-240V, 50Hz
Dimensions (Indoor Unit)	Varies by model
Dimensions (Outdoor Unit)	Varies by model
Weight (Indoor Unit)	Varies by model
Weight (Outdoor Unit)	Varies by model
Noise Level (Indoor Unit)	20 - 45 dB(A)
Noise Level (Outdoor Unit)	45 - 60 dB(A)

Summary

Safety Precautions and Warnings

Understanding Safety Symbols

Defines the meaning of WARNING and CAUTION symbols used in the manual.

General Electrical Safety Guidelines

Covers grounding, circuit breakers, multi-outlets, and wiring safety for electrical connections.

Safety Precautions: Hazard Avoidance

Water and Electrical Hazard Warnings

Details risks associated with water contact and electrical components.

Product Handling and Environmental Safety

Safety Precautions: Installation and Operation

Installation, Refrigerant, and Operational Safety

TERMOTRONIC™ Controller Overview

Controller Interface and Button Functions

TERMOTRONIC™ Controller Operation

Device Activation and Standby Status

Device Operation and Status Display

TERMOTRONIC™ Controller States

TERMOTRONIC™ Controller Information

TERMOTRONIC™ Controller Settings

Step-by-Step Parameter Adjustment

Detailed instructions for adjusting various device parameters via the controller.

Quick Settings for User Adjustments

Setting Room and Water Temperatures

Guides on adjusting room temperature and heating/cooling water temperature.

Quick Settings for Room Comfort

Room Temperature Control (KT-1)

Quick Settings for Heating and Water

Heated Water Temperature Control

How to adjust heated water temperature using the Heating curve mode.

Quick Settings for Heated Water Adjustment

Adjusting Heated Water Temperature (C/W)

Step-by-step process to modify heated water temperature using the C/W parameter.

Quick Settings for Water Control Modes

Quick Settings for Domestic Hot Water

Domestic Hot Water (DHW) Temperature Settings

Instructions for setting the desired temperature for domestic hot water.

Quick Settings for Operational Modes

Winter/Summer Mode Selection

How to choose between winter and summer operating modes.

Quick Settings for Mode Changes

Changing Operating Mode (Manual)

Step-by-step guide for manual switching between Winter, Summer, and AUTO modes.

Quick Settings for Cooling Configuration

Setting Cooling Temperatures

Adjusting cold water temperature for cooling circuits.

Quick Settings for Auxiliary Heat Source

Auxiliary Heat Source Activation

How to activate the backup source to supplement heating power.

Quick Settings for Backup Heat Source

Manual Auxiliary Power Source Activation

Detailed steps for manually turning on the backup heat source.

Quick Settings for Backup Source Operation

Backup Source Operation Modes

Advanced Heating Settings

Heating System Configuration Notes

General notes and considerations for setting up the heating system.

Heating Water Control Modes

Explains Heating Curve and Constant modes for water temperature control.

Advanced Heating Control Settings

Switching Heating Control Modes

Steps to transition heating control from weather curve to constant temperature.

Advanced Weather Controlled Heating Settings

Weather Controlled Heating Explained

How the system adjusts water temperature based on external air conditions.

Advanced Heated Water Temperature Settings

Setting Temperature Correction

Adjusting heated water temperature for comfort during transitional weather periods.

Advanced Maximum Heated Water Temperature Settings

Adjusting Maximum Heated Water Temperature (Normal Parameter)

How to set the 'Normal' parameter for maximum heated water temperature.

Advanced Constant Temperature Heating Settings

Heating with Constant Temperature

Setting Constant Heated Water Temperature

Configuring the 'Normal' parameter for constant water temperature.

User Menus and Parameters Guide

Heating Parameters Explained

User Menus and Parameters - Cooling and Circuits

Cooling Parameters Explained

Circuit-Specific Parameters

User Menus and Parameters - DHW Settings

Domestic Hot Water (DHW) Parameters

User Menus and Parameters - Alternative Source

Alternative Source Integration Parameters

User Menus and Parameters - Backup and Modes

Backup Source and Mode Settings

User Menus and Parameters - Special Functions

Screed Drying and System Operation Parameters

User Menus and Parameters - Sensor Data

Diagnostic Displays and Procedures

Accessing Diagnostic Displays

Disruptions, Alarms, and Troubleshooting

Device Protection Mechanisms

Disruptions, Alarms, and Troubleshooting (Continued)

Normal Operation Errors and Alarms

Specific error codes and descriptions occurring during normal device operation.

Backup Operation Errors and Alarms

Error codes and descriptions relevant to backup operational modes.

Troubleshooting Air-Water Device Errors

Troubleshooting Pressure and Flow Errors

Procedures for resolving errors related to high/low pressure and insufficient flow.

Troubleshooting Electrical and Sensor Issues

Troubleshooting Electrical and Sensor Errors

Steps to resolve issues with electrical supply, sensors, and temperature differences.

Troubleshooting Specific Alarms

Troubleshooting Specific Alarms

Procedures for addressing alarms like defrost, DHW heating, and efficiency warnings.

Maintenance and Service Recommendations

Recommended Maintenance Activities

Critical Service Situations

Critical situations requiring immediate professional service intervention.

Settings for Heating System at Start-up

Heating Mode Settings Recording

Cooling Mode Settings Recording

Settings for Heating System at Start-up (Continued)

Domestic Hot Water (DHW) Settings Recording

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