Table of Contents
Troubleshooting
Related Manuals for LG FM48AH U33
Summarization of Contents
Part 1 General Information
1. Safety Precautions
Essential safety warnings and cautions for servicing and repair to prevent injury and property damage.
2. Model Line Up
Catalog of indoor and outdoor air conditioner units, including chassis, capacity, and model names.
3. Nomenclature
Explanation of the coding system used for identifying indoor, outdoor, and branch distributor units.
Part 2 Functions & Controls
1. List of Functions & Controls
Comprehensive overview of all functions and controls available for the air conditioner system.
2. Air flow
Details on airflow control features like auto swing, chaos wind, jet cool, and swirl wind operations.
3. Air purifying
Description of the PLASMA Air Purifying System for removing contaminants and improving air quality.
4. Installation Functions
Guidance on setting external static pressure (ESP) and high ceiling operation modes.
5. Reliability
Information on operational reliability features such as hot start, self-diagnosis, and soft dry operation.
6. Convenience Functions & Controls
Features enhancing user convenience like auto modes, timers, child lock, and group control.
7. Special Function & KIT
Details on advanced features like zone control, low ambient control, and auto elevation grille.
Part 3 Control logic
1. Compressor
Explanation of the compressor's basic operating principle and inverter starting methods.
2. Step(frequency) control
Logic for controlling compressor frequency based on room conditions and primary step settings.
3. Reversing valve operation
Detailed operation of the reversing valve during cooling, heating, and defrosting modes.
4. Discharge pipe control
Control logic based on discharge pipe temperature to prevent over-temperature conditions.
5. Input Current Control
System for controlling input current to protect power semiconductor devices from damage.
6. Outdoor Fan Control
Logic governing outdoor fan operation based on outdoor temperature for AC and DC motors.
7. Defrost Control
Algorithm and conditions for initiating and completing the defrost operation in heating mode.
8. LEV Control
Control logic for the Liquid Expansion Valve (LEV) opening and starting procedures.
9. Oil restoration operation
Procedure for restoring oil to the compressor after specific operating conditions.
10. Compressor warm-up control logic
Control logic to protect the inverter compressor at low outdoor temperatures.
11. Heat sink control
Management of heat sink temperature to prevent failure and ensure system operation.
Part 4 Test Run
1. Check before Test Run
Pre-flight checks including refrigerant leakage, valve status, and insulation resistance.
2. Test Run Flow chart
Step-by-step flowchart guiding the process of testing the air conditioner's operation.
3. Test Running
Procedures for conducting test runs for various unit types and evaluating performance metrics.
Part 5 Trouble Shooting
1. Self-diagnosis Function
Information on error indicators, codes for indoor and outdoor units, and their meanings.
2. Pump Down
Procedure for safely recovering refrigerant from the system into the outdoor unit.
3. Evacuation
Method for removing non-condensable gases and moisture from the refrigeration system.
4. Gas Charging
Steps for accurately charging the system with the correct amount of refrigerant.
5. Cycle Part
Analysis of symptoms related to temperature differences and refrigeration cycle issues.
6. Electronic Parts
Troubleshooting steps for product failures and remote controller malfunctions.
Need help?
Do you have a question about the FM48AH U33 and is the answer not in the manual?
Questions and answers