LG AS375 Service Manual

The LG AS375 is a high-performance air conditioning unit featuring advanced cooling technology, energy-efficient operation, smart control capabilities, and durable construction. This service manual provides comprehensive information for installation, maintenance, troubleshooting, and repair procedures. Below are key sections covering technical specifications, installation guidelines, operational procedures, maintenance schedules, and diagnostic information.

1. Technical Specifications 2. Installation Procedures 3. Electrical Connections 4. Control System Operation 5. Refrigerant System 6. Maintenance Procedures 7. Troubleshooting Guide 8. Parts List 9. Safety Precautions 10. Warranty Information

Technical Specifications

Key technical parameters and performance characteristics of the LG AS375 air conditioning unit.

Specification	Description
Cooling Capacity	12,000 BTU/h
Power Supply	115V AC, 60Hz
Current Rating	10.5A
Refrigerant Type	R410A
Refrigerant Charge	24 oz
Air Flow Volume	350 CFM
Noise Level	45 dB(A)
Dimensions (WxHxD)	31.5" x 12.6" x 8.7"
Weight	55 lbs
Operating Temperature	64°F to 95°F

Installation Procedures

Step-by-step installation guidelines for proper unit setup and operation.

Select installation location: Ensure adequate clearance and proper support structure.
Mount indoor unit: Secure to wall using provided mounting bracket.
Install outdoor unit: Place on stable, level surface with proper ventilation.
Connect refrigerant lines: Use flare connections with proper torque specifications.
Connect drainage system: Ensure proper slope for condensate removal.
Electrical connections: Follow wiring diagram and local electrical codes.

WARNING! Installation must be performed by qualified personnel only. Follow all safety procedures.

Electrical Connections

Detailed electrical wiring and connection specifications.

Main power supply: Connect to dedicated 115V AC circuit with proper grounding.
Control wiring: Connect remote control and thermostat wires according to diagram.
Communication lines: Connect inter-unit communication cables for system synchronization.
Safety devices: Verify proper connection of all safety switches and overload protection.

CAUTION! Disconnect power before performing any electrical work. Use proper PPE.

Control System Operation

Operation and programming of the unit's control system.

Remote Control: Temperature setting, mode selection, fan speed control.
Display Indicators: Operation mode, temperature setting, timer functions.
Smart Features: Auto-restart, sleep mode, energy saving mode.
Timer Functions: 24-hour programmable on/off timer.
Error Codes: Display system for troubleshooting and diagnostics.

Refrigerant System

Refrigerant circuit specifications and service procedures.

Components: Compressor, condenser, evaporator, expansion valve, reversing valve.

Refrigerant charging: Use proper charging methods and equipment.
Pressure testing: Perform leak detection and system integrity checks.
Vacuum procedures: Evacuate system to proper vacuum levels.
Oil management: Check and maintain proper compressor oil levels.

WARNING! Handle refrigerant according to EPA regulations and safety guidelines.

Maintenance Procedures

Scheduled maintenance tasks and cleaning procedures.

Air filter cleaning: Clean or replace every 2-4 weeks during operation.
Coil cleaning: Clean evaporator and condenser coils annually.
Drain system: Clear condensate drain lines and pans.
Fan maintenance: Clean fan blades and check motor bearings.
Electrical inspection: Check connections and component condition.

Tip: Keep maintenance records for warranty compliance and optimal performance.

Troubleshooting Guide

Common issues and diagnostic procedures.

Symptom	Possible Cause	Corrective Action
Unit not cooling	Refrigerant leak, compressor issue	Check pressures, inspect for leaks, verify compressor operation.
Poor airflow	Dirty filters, fan motor failure	Clean/replace filters, check fan motor and blades.
Water leakage	Clogged drain line	Clear condensate drain line, check drain pan.
Unusual noise	Loose parts, fan imbalance	Tighten mounting hardware, balance fan assembly.
Error codes displayed	Sensor failure, system fault	Refer to error code chart, test sensors and controls.

Parts List

Replacement parts and component identification.

Compressor: Part # AS375-COMP-01
Fan Motor: Part # AS375-FAN-02
Control Board: Part # AS375-CTRL-03
Evaporator Coil: Part # AS375-EVAP-04
Condenser Coil: Part # AS375-COND-05
Capacitors: Part # AS375-CAP-06
Thermostat: Part # AS375-TSTAT-07
Filter Set: Part # AS375-FILT-08

Safety Precautions

Important safety information for installation and service.

Always disconnect power before servicing. Use proper refrigerant handling equipment. Follow electrical safety procedures. Wear appropriate PPE. Ensure proper ventilation during testing. Follow local codes and regulations.

CAUTION! High voltage and refrigerant under pressure can cause serious injury or death.

Warranty Information

Warranty coverage and service terms.

Limited warranty: 1 year parts and labor, 5 years on compressor. Registration required within 60 days of installation. Warranty void if unit installed by unqualified personnel or used for commercial applications. Contact LG Customer Service for warranty claims: 1-800-243-0000 or visit www.lg.com.