LG Dishwasher LDF7920ST Installation Manual

The LG Dishwasher LDF7920ST is a premium built-in dishwasher featuring QuadWash™ technology, LoDecibel™ quiet operation, EasyRack™ Plus adjustable upper rack, Stainless Steel interior, SmartThinQ® technology compatibility, and multiple wash cycles. This manual provides comprehensive installation instructions, safety guidelines, and setup procedures for proper installation and operation.

1. Safety Instructions 2. Package Contents 3. Installation Requirements 4. Step-by-Step Installation 5. Electrical Connection 6. Water Connection 7. Drain Connection 8. Final Setup & Leveling 9. Specifications 10. Troubleshooting

Safety Instructions

Read all instructions before installation. Failure to follow these instructions may result in property damage, personal injury, or death.

Warning Type	Description
Electrical Hazard	Disconnect power before installation. Use dedicated circuit.
Water Damage	Ensure all water connections are tight and leak-free
Lifting Hazard	Dishwasher is heavy; use two people for handling
Sharp Edges	Wear gloves when handling to prevent cuts
Chemical Exposure	Use only dishwasher-safe detergents and rinse aids

Package Contents

Unpack and verify all components are present before beginning installation.

LG Dishwasher LDF7920ST unit
Installation hardware kit
Drain hose assembly
Water supply line
Power cord
Upper and lower racks
Cutlery basket
Owner's manual and installation guide

NOTE: Contact LG support immediately if any components are missing or damaged.

Installation Requirements

Ensure you have the proper tools and materials before starting installation.

Tools Required: Phillips screwdriver, adjustable wrench, level, pliers, tape measure, drill
Materials Required: Teflon tape, wire nuts, hose clamps, electrical tape
Space Requirements: 24-inch width, 24-inch depth, 34-inch height minimum
Utility Requirements: 120V dedicated circuit, hot water supply, drain connection

WARNING! Verify local building codes and obtain permits if required.

Step-by-Step Installation

Follow these steps in order for proper installation.

Remove packaging and protective film from unit
Position dishwasher in front of installation space
Remove lower access panel and insulation
Connect electrical wiring (see Electrical Connection section)
Connect water supply line (see Water Connection section)
Connect drain hose (see Drain Connection section)
Slide unit into cabinet opening
Level and secure unit to countertop/cabinets
Install upper and lower racks
Run initial test cycle

Electrical Connection

The dishwasher requires a dedicated 120V, 15-amp circuit with proper grounding.

Connection Type	Requirements
Voltage	120V AC, 60Hz
Circuit	Dedicated 15-amp circuit
Wire Gauge	14 AWG minimum
Grounding	Proper grounding required
Connection	Direct wire or grounded outlet

CAUTION! Always disconnect power at circuit breaker before making electrical connections.

Water Connection

Connect to hot water supply line with proper fittings and ensure leak-free connection.

Turn off water supply at main valve
Connect water supply line to hot water valve
Use Teflon tape on threaded connections
Connect other end to dishwasher water inlet
Turn water supply back on and check for leaks
Water pressure should be 20-120 psi
Water temperature should be 120°F minimum

Tip: Use braided stainless steel supply line for durability and leak prevention.

Drain Connection

Proper drain connection prevents backflow and ensures efficient drainage.

Drain Hose Height: Minimum 20 inches, maximum 8 feet from floor
Air Gap: Required in some municipalities; check local codes
Connection Point: Sink drain or garbage disposal
Hose Routing: Avoid kinks and sharp bends
High Loop: Create high loop under sink to prevent backflow

Final Setup & Leveling

Proper leveling ensures optimal performance and prevents leaks.

Adjust leveling legs using wrench until unit is level front to back and side to side
Check level with bubble level on top of unit
Secure unit to countertop using mounting brackets
Install toe kick panel at bottom front
Connect power and turn on circuit breaker
Run initial test cycle without dishes to check for leaks
Verify proper drainage and operation

WARNING! Do not operate until unit is properly leveled and secured.

Specifications

Model: LDF7920ST
Type: Built-in Dishwasher
Color: Stainless Steel
Capacity: 14 place settings
Noise Level: 44 dBA (Quiet Operation)
Water Consumption: 2.9 gallons per cycle
Energy Consumption: 0.87 kWh per cycle
Dimensions (HxWxD): 33.875" x 23.875" x 24.5"
Wash Cycles: Normal, Heavy, Light, Rinse Only, Crystal, Speed Wash
Special Features: QuadWash™, EasyRack™ Plus, SmartThinQ® compatible

Troubleshooting

Symptom	Possible Cause	Corrective Action
Dishwasher won't start	Power issue/door not closed	Check power supply; ensure door is fully closed and latched
Water not filling	Water supply valve closed	Ensure water supply valve is fully open
Poor cleaning	Spray arms blocked	Check for obstructions in spray arms; clean filters
Water not draining	Drain hose clogged/kinked	Check drain hose for kinks or clogs; ensure proper height
Leaking water	Loose connections	Tighten all water connections; check door seal
Unusual noise	Improper loading	Rearrange dishes; ensure nothing is touching spray arms

Reset: Unplug for 5 minutes or turn off circuit breaker to reset control board.

Service: 1-800-243-0000; www.lg.com