LG LSU363HLV3 Installation Manual

The LG LSU363HLV3 is a high-efficiency, multi-zone heat pump system designed for residential and light commercial applications. This manual provides essential information for the safe and proper installation, setup, operation, and maintenance of the unit. It is crucial that all installation procedures are performed by qualified personnel in accordance with local codes and regulations.

1. Safety Precautions 2. Unit Overview & Components 3. Pre-Installation Checks 4. Installation Procedure 5. Electrical Wiring 6. Refrigerant Piping 7. Drainage & Ventilation 8. System Commissioning 9. Specifications 10. Troubleshooting Guide 11. Maintenance Schedule

Safety Precautions

Read all instructions before installation. Failure to follow warnings and instructions can result in electric shock, fire, system damage, or personal injury.

Symbol	Meaning	Instruction
WARNING	Risk of personal injury or death	Disconnect all power before servicing. Use proper personal protective equipment (PPE).
CAUTION	Risk of equipment damage	Handle unit with care. Do not apply excessive force to components.
NOTE	Important information	Follow specific procedures for optimal performance.

WARNING! Installation must comply with national wiring regulations and local codes. Unit contains refrigerant under high pressure.

Unit Overview & Components

Key components of the LSU363HLV3 outdoor unit.

Compressor: High-efficiency variable speed scroll compressor.
Heat Exchanger: Corrosion-resistant fin and tube coil.
Fan Motor: DC inverter motor for quiet operation.
Control Board: Main PCB for system communication and protection.
Service Valves: Liquid and gas line shut-off valves.
Electrical Terminal Block: For power and communication wiring.

Included Parts: Installation manual, mounting brackets (if applicable), communication cable, drain plug, plastic tie-down straps.

Pre-Installation Checks

Before installation, verify the following conditions.

Site Selection: Choose a location with sufficient clearance (min 12 inches on sides, 48 inches front, 24 inches above). Ensure stable, level foundation.
Unit Inspection: Check for shipping damage. Verify model number (LSU363HLV3) matches order.
Tools Required: Torque wrench, manifold gauge set, vacuum pump, flaring tool, pipe cutter, multimeter, insulation tape, leak detector.
Refrigerant Type: Confirm correct refrigerant (R-410A) is available.

CAUTION! Do not install unit in a location prone to flooding or where combustible gases may be present.

Installation Procedure

Step-by-step guide for mounting the outdoor unit.

Prepare Foundation: Install on a concrete pad or sturdy mounting brackets. Ensure unit is perfectly level.
Position Unit: Lift unit into place using appropriate equipment. Do not lift by service valves or piping.
Secure Unit: Bolt unit securely to foundation to prevent vibration and movement.
Route Piping: Plan refrigerant line route to indoor units, minimizing length and bends.

WARNING! Unit is heavy. Use proper lifting techniques and equipment. Two-person lift is recommended.

Electrical Wiring

Electrical connections must be made by a licensed electrician.

Terminal	Wire Specification	Torque Setting
L1, L2 (Power)	Min 10 AWG copper, 208/230V, 60Hz	18 lb-in
Communication (S1, S2)	Shielded 18 AWG cable	8 lb-in
Ground	Green or bare copper, 10 AWG	18 lb-in

Disconnect main power at circuit breaker.
Remove electrical cover panel.
Connect wires to terminal block as per wiring diagram on unit panel.
Secure cable with strain relief clamp.
Replace cover before restoring power.

WARNING! Incorrect wiring can cause electrical shock, fire, or equipment failure.

Refrigerant Piping

Proper piping is critical for system efficiency and longevity.

Pipe Sizing: Use approved ACR copper tubing. Refer to manual for maximum length and elevation difference.
Flaring: Cut tubing square, deburr, and create a 45-degree flare. Apply minimal refrigeration oil to flare surface.
Connection: Connect pipes to unit service valves. Hand-tighten nuts, then torque to specification (typically 18-22 ft-lb).
Leak Check: Pressurize system with dry nitrogen (150 psi) and check all joints with electronic leak detector.
Evacuation: Connect vacuum pump. Evacuate to below 500 microns. Hold for 15 minutes to check for rise.
Charging: Release refrigerant from unit by opening service valves. Weigh in additional charge if required per piping length.

CAUTION! Never use oxygen or compressed air for pressure testing. Always use a regulator with nitrogen.

Drainage & Ventilation

Ensure proper condensate management and airflow.

Condensate Drain: In heating mode, unit may produce condensate. Ensure site slopes away from unit or connect to drain line if local codes require.
Clearances: Maintain all minimum clearances for airflow and service access. Do not obstruct inlet or outlet grilles.
Snow/Ice: In snowy regions, consider installing a snow stand or hood to prevent intake blockage.

NOTE: Poor ventilation can lead to reduced capacity, high head pressure, and system shutdown.

System Commissioning

Final steps to activate and verify system operation.

Restore power to outdoor unit and all connected indoor units.
Power on system via thermostat or controller.
Check communication: LED on control board should indicate normal operation (steady green).
Enter test mode to run compressor and fan. Verify correct rotation and operation in both cooling and heating modes.
Measure operating parameters: Suction pressure, discharge pressure, superheat, subcooling, amp draw. Compare to values in performance data table.
Set user preferences on thermostat (setback schedules, fan modes, etc.).

CAUTION! Do not run compressor without proper refrigerant charge and airflow.

Specifications

Model: LSU363HLV3
Type: Multi-Zone Heat Pump Outdoor Unit
Cooling Capacity: 36,000 BTU/H (10.5 kW)
Heating Capacity: 38,000 BTU/H (11.1 kW)
Refrigerant: R-410A
Electrical Data: 208/230V, 1 Phase, 60 Hz, Min Circuit Ampacity 25A, Max Fuse 35A
Sound Level: 68 dB(A) (Outdoor)
Net Weight: 154 lbs (70 kg)
Operating Range: Cooling: 5°F to 122°F Outdoor // Heating: -13°F to 75°F Outdoor

Troubleshooting Guide

Indicator LED	Fault Code	Possible Cause	Corrective Action
Flashing Red	E1	Communication error with indoor unit	Check wiring between units. Verify addresses are set correctly.
Flashing Amber	CH35	Low refrigerant pressure	Check for leaks. Verify refrigerant charge.
Steady Red	F1	PCB malfunction	Power cycle unit. If persistent, replace control board.
LED Off	-	No power	Check circuit breaker, disconnect switch, and wiring connections.

Reset: Turn power off for 5 minutes, then restore. If fault recurs, contact qualified service technician.

Maintenance Schedule

Regular maintenance ensures efficiency and extends unit life. Perform these tasks seasonally or as specified.

Monthly: Visually inspect for debris, ice, or damage around unit.
Seasonally (Start of Cooling/Heating):
- Clean coil fins with soft brush or low-pressure water spray (do not bend fins).
- Check electrical connections for tightness and corrosion.
- Verify clearances are maintained.
Annually (By Technician):
- Check refrigerant charge and system pressures.
- Measure compressor amp draw.
- Inspect fan motor and blades.
- Check drain pan and line for clogs.

WARNING! Always disconnect power before performing any maintenance.