Wen DF451i

IMPORTANT: Your new tool has been engineered and manufactured to WEN’s highest standards for dependability,
ease of operation, and operator safety. When properly cared for, this product will supply you years of rugged,
trouble-free performance. Pay close attention to the rules for safe operation, warnings, and cautions. If you use
your tool properly and for its intended purpose, you will enjoy years of safe, reliable service.
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4500W DUAL FUEL
INVERTER GENERATOR
Instruction Manual
MODEL DF451i

Wen DF451i Specifications

General

Model	DF451i
Type	Inverter Generator
Fuel Type	Gasoline
Engine Type	4-Stroke OHV
Displacement	212 cc
Starting Wattage	4500W
Dimensions	23.2 in x 18 in x 20.1 in

Summary

Generator Specifications

Generator Electrical and Physical Data

Details on rated wattage, voltage, amperage, phase, frequency, dimensions, and weight.

Engine Technical Details

Information on engine type, displacement, speed, fuel capacity, oil capacity, and run time.

Introduction and Service Information

Generator Model and Purchase Record

Section to record generator model, date of purchase, and vendor.

Generator Maintenance Log

A table for recording service dates for oil changes, spark plugs, etc.

Safety Information Overview

General Safety Guidelines and Symbols

Introduction to generator safety and explanations of hazard warning symbols.

Emissions Notice and Support Contact

Information on emissions compliance and customer service contact details.

Generator Safety Warnings

Carbon Monoxide Hazard

Critical warning about carbon monoxide poisoning and safe indoor/outdoor use.

Flammability and Explosion Risks

Warnings regarding flammable fuel vapors, ignition sources, and refueling safety.

California Proposition 65 Advisory

Notice about chemicals known to cause cancer or reproductive harm.

Safe Generator Operation and Environment

Safe Operating Environment Rules

Guidelines for generator placement, ventilation, and protection from elements.

Preparation and Operation Safety Practices

Safety steps for grounding, fuel handling, and general operation.

Generator Usage Safety Precautions

General Usage Safety Instructions

Key safety points for connecting loads, handling hot parts, and stopping the generator.

Generator Storage and Post-Use Safety

Guidelines for safe handling after operation and proper storage preparation.

Unpacking and Parts Identification

Generator Unpacking Procedure

Instructions for safely removing the generator from its packaging.

Included Components and Tools

List of parts, accessories, and tools provided with the generator.

Understanding Your Inverter Generator

Generator Purpose and Main Parts

Overview of the inverter generator's function and identification of external components.

Digital Display and Indicator Lights

Explanation of the digital display's functions and indicator light meanings.

Control Panel Layout and Functions

Detailed Control Panel Component Guide

Description of each button, switch, and receptacle on the control panel.

Generator Preparation Steps

Removing Shipping Mounting Plates

Instructions for removing protective plates before operation.

Engine Oil Preparation

Adding and Checking Engine Oil

Procedure for initial oil filling and level checks.

Recommended Engine Oil Viscosity

Guidance on selecting the correct oil type and viscosity for operating temperatures.

Engine Oil Level Management

Checking Oil Level Before Operation

Steps to verify oil level prior to starting the generator.

Low Oil Shutdown System Explanation

Information on the automatic shutdown triggered by low oil.

Fueling the Generator with Gasoline

Gasoline Fueling Procedure and Safety

Instructions for adding unleaded gasoline, including safety precautions.

Connecting to LPG Fuel Source

LPG Cylinder Connection Guide

Step-by-step instructions for connecting the generator to an LPG tank.

Fuel Selection and Battery Connection

Automatic Fuel Selection Technology

Explanation of how the generator prioritizes and selects fuel sources.

Battery Connection Safety Overview

Introduction to connecting the battery and safety warnings.

Generator Battery Installation

Step-by-Step Battery Connection

Detailed instructions for connecting the generator's lithium-ion battery.

Generator Grounding and Altitude

Grounding Procedure for Safety

Instructions for properly grounding the generator to reduce shock risk.

High Altitude Operation Guidelines

Information on altitude kits and performance adjustments for high elevations.

Generator Starting Procedure

Critical Pre-Start Safety Reminders

Essential safety warnings and checks before starting the generator.

Starting the Generator

Starting Generator with Gasoline

Instructions for starting the generator using gasoline fuel.

Electric Start Method

Procedure for starting the generator using the electric start button.

Pull Start Method

Procedure for starting the generator using the manual recoil starter.

Starting Generator with LPG and Break-in

Starting Generator with LPG

Instructions for starting the generator using LPG fuel.

Engine Break-In Procedure

Recommended steps for the initial break-in period to ensure engine longevity.

Calculating Power Requirements

Determining Device Wattage Needs

Guide on calculating running and starting wattages for connected devices.

Appliance Wattage Estimates

Common Electrical Appliance Wattages

A table listing estimated running and surge wattages for common appliances.

Connecting Electrical Loads

Procedure for Connecting Devices

Steps to safely connect electrical devices to the generator.

Generator Usage and Fueling

Power Cord Selection Guidelines

Recommendations for choosing appropriate power cords based on wire gauge and length.

Switching Between Fuel Types

Instructions on how to safely switch between gasoline and LPG fuel sources.

Generator Operation Modes and Overload

Eco-Mode Switch Functionality

Explanation of the Eco-mode feature for fuel efficiency and noise reduction.

Parallel Generator Operation

Information on connecting two generators for increased power output.

Overload Indicator and Reset Procedure

How to identify and resolve generator overload conditions.

Generator Circuit Breakers and Meter

Circuit Breaker Functions

Explanation of individual AC and DC circuit breakers and their reset.

Multi-meter Display and Runtime Tracking

How to read voltage, frequency, and runtime displayed on the generator's meter.

Shutting Down the Generator

Automatic Shutdown (Gasoline)

Procedure for automatic fuel shutoff for carburetor longevity.

Automatic Shutdown (LPG)

Procedure for automatic shutdown when using LPG.

Manual Generator Shutdown

Manual Engine Shutdown Process

Steps for manually shutting off the generator engine.

Generator Maintenance Schedule

Recommended Maintenance Tasks and Intervals

Table outlining routine maintenance for engine oil, air filter, spark plug, etc.

Key Generator Maintenance Tips

Important advice for preventing clogs, fuel deterioration, and battery charging.

Cleaning the Generator Exterior

Instructions for cleaning the generator's housing and ventilation openings.

Engine Oil Level Check and Addition

Procedure for Checking and Adding Oil

Detailed steps for checking the oil level and adding oil as needed.

Carburetor Draining Procedure

Steps to Drain the Carburetor

Instructions for draining the carburetor to prevent fuel clogs.

Air Filter and Spark Arrestor Maintenance

Air Filter Inspection and Cleaning

Procedure for inspecting, cleaning, and replacing the air filter element.

Spark Arrestor Inspection and Cleaning

Instructions for inspecting and cleaning the spark arrestor.

Spark Plug Maintenance

Spark Plug Inspection and Replacement

Guide on inspecting, gapping, and replacing the spark plug.

Engine Oil Draining and Changing

Procedure for Changing Engine Oil

Detailed steps for draining and refilling the engine oil.

Fuel Tank and Carburetor Draining

Procedure for Draining Fuel System

Instructions for draining the fuel tank and carburetor for storage.

Battery Maintenance and Storage

Lithium-ion Battery Care and Storage

Guidelines for charging, disconnecting, and storing the battery.

Generator Transportation and Storage

Safe Generator Transportation

Precautions to prevent fuel spillage and damage during transport.

Generator Storage Guidelines

Procedures for short and extended storage, including fuel stabilization.

Responsible Product Disposal

Information on recycling electronic components and disposing of oil/fuel.

Troubleshooting Common Issues

Engine Starting Problems

Troubleshooting for issues preventing the engine from starting.

No Electrical Output Troubleshooting

Diagnosing and resolving problems with no electrical output.

Partial Load Support Issues

Solutions for when the generator does not support all connected devices.

Engine RPM Fluctuations (Hunting)

Troubleshooting unstable engine speed and fluctuating RPMs.

Generator Wiring Diagram

Electrical Schematic Overview

A diagram illustrating the generator's electrical connections and components.

Exploded Views and Parts Lists

Crankcase Assembly Parts

Detailed parts list for the generator's crankcase assembly.

Engine Component Parts

Cylinder Head Assembly Parts

Detailed parts list for the cylinder head assembly.

Crankshaft Assembly Parts

Detailed parts list for the crankshaft assembly.

Engine Internals Parts Lists

Piston, Connecting Rod, and Rings

Parts list for the piston ring set and connecting rod.

Valve Train and Camshaft Components

Parts list for the valve train and camshaft subassembly.

Recoil Starter Assembly Parts

Parts list for the recoil starter and shroud assembly.

Fuel and Ignition System Parts

Carburetor Assembly Parts

Detailed parts list for the carburetor assembly.

Flywheel, Impeller, and Ignition Parts

Parts list for flywheel, impeller, starter pulley, and ignition coil.

Air Filter Assembly Parts

Parts list for the air filter assembly.

Exhaust and Fuel Tank Parts

Muffler Assembly Components

Parts list for the muffler assembly, including shroud and gasket.

Fuel Tank System Components

Fuel Tank Assembly Parts List

Detailed parts list for the fuel tank and its associated components.

Frame and Related Components

Generator Frame Assembly Parts

Parts list for the generator frame, battery case, and inverter mounting.

Control Panel Parts List

Control Panel Components Breakdown

Detailed parts list for the control panel, including switches and outlets.

Wheel and Handle Assembly Parts

Wheel Assembly Parts List

Parts list for the wheel assembly, including arms and connectors.

Generator Shell and Outer Cover Parts

Shell and Outer Cover Components

Parts list for the generator's left/right shells, covers, and handles.

Base Plate and Muffler Cover Parts

Base Plate Assembly Parts

Parts list for the generator's base plate and supports.

Muffler Cover Parts List

Parts list for the muffler cover and related components.

Warranty Information

Limited Warranty Terms and Conditions

Details on warranty coverage, exclusions, and claim procedures.