Generac Power Systems 04390-1, 04456-1 Fuel Requirements Recommendations, Fuel Consumption

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Section 1 — General Information

Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators

1.6FUEL REQUIREMENTS

AND RECOMMENDATIONS

With LP gas, use only the vapor withdrawal

system. This type of system uses the vapors formed above the liquid fuel in the storage tank.

The engine has been fitted with a fuel carburetion system that meets the specifications of the 1997 California Air Resources Board for tamper-proof dual fuel systems. The unit will run on natural gas or LP gas, but it has been factory set to run on natural gas. Should the primary fuel need to be changed to LP gas, the fuel system needs to be reconfigured. See Section 1.8 for instructions on reconfiguration of the fuel system.

Recommended fuels should have a Btu content of at least 1,000 Btus per cubic foot for natural gas; or at least 2,520 Btus per cubic foot for LP gas. Ask the fuel supplier for the Btu content of your fuel.

3.Disconnect wire #0 and wire #14 from the gas solenoid located on the top of the demand regu- lator.

4.Remove the demand regulator by rotating coun- terclockwise.

5.Remove the brass hose fitting from the outlet port of the demand regulator.

6.Remove the brass metering jet (loosen counter- clockwise) from the housing port of the demand regulator located on the side of the regulator.

7.Install new LP metering jet (tighten clockwise) in the outlet port of the demand regulator.

8.Refit the brass hose fittings to the outlet port of the demand regulator.

9.Reverse procedure steps 1-4 to reinstall demand regulator.

10.Reverse the procedure to convert back to natural gas.

Figure 1.3 – Demand Regulator

Fuel pressure for both natural gas and liquid propane set ups should be 11 inches to 14 inches of water column (0.6 psi) at all load ranges.

NOTE:

A seperate gas line and regulator may be needed to assure proper gas pressure (11-14”) to the gen- erator. Low gas pressure can cause hard starting and could affect engine durability.

1.7FUEL CONSUMPTION

 

Model #

Nat. Gas (*)

LP Vapor (**)

 

 

 

1/2 Load

Full Load

1/2 Load

Full Load

 

 

04389

74

105

0.91/33

1.21/44.1

 

 

04456

114

185

1.34/48.9

2.17/79.0

 

 

04390

148.5

240

1.73/63.2

2.80/102.3

 

 

 

 

 

 

 

 

*Natural gas is in cubic feet per hour.

**LP is in gallons per hour/cubic feet per hour.

DANGER

Gaseous fuels such as natural gas and liquid propane (LP) gas are highly explosive. Even the slightest spark can ignite such fuels and cause an explosion. No leakage of fuel is permitted. Natural gas, which is lighter than air, tends to collect in high areas. LP gas is heavier than air and tends to settle in low areas.

1.8RECONFIGURING THE FUEL SYSTEM

◆1.8.1 7 KW, 410CC ENGINE

FUEL HOSE

FUEL HOSE

BRASS HOSE

BRASS HOSE

FITTING

FITTING

 

FUEL JET

HOUSING

HOUSING

PORTS

PORTS

NG FUEL SYSTEM

LP FUEL SYSTEM

NOTE:

The natural gas adjustment screw is preset during installation and should not need any further adjustment.

◆1.8.2 12KW AND 15KW, 990CC ENGINES

To reconfigure the fuel system from NG to LP, follow these steps:

NOTE:

The primary regulator for the propane supply is NOT INCLUDED with the generator. A fuel pres- sure of 11 to 14 inches of water column (0.6 psi) to the fuel inlet of the generator MUST BE SUP-

PLIED.

1. Turn OFF the main gas supply.

To reconfigure the fuel system from NG to LP, follow these steps:

1.Turn the main gas supply off.

2.Remove the carburetor fuel hose from the outlet port of the demand regulator (Figure 1.3).

2.Remove the engine air in baffle located on the left hand side of the battery compartment. Two M6 screws are located on top of the baffle and two M6 screws are located on the inside of the baffle towards the back.

Generac® Power Systems, Inc. 7

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Contents Installation Authorized Dealer Location IntroductionMaintenance Post Installation Start-up AdjustmentsTroubleshooting Introduction Inside Front CoverGeneral Hazards ‹ Standards Index Electrical HazardsUNPACKING/INSPECTION Protection SystemsSystem SET LED 7 kW, Single Cylinder GH-410 Engine Your GeneratorSpecifications ‹ 1.5.1 Generator‹ 1.5.2 Engine Fuel Requirements Recommendations Reconfiguring the Fuel SystemFuel Consumption 1 7 KW, 410CC EngineLocation Transfer SwitchGenerator 2.1 7 kW, 12 kW and 15 kW UnitsBattery Battery InstallationCheck Transfer Switch Operation Before Initial START-UPElectrical Checks Checking Automatic Operation Generator Tests Under LoadAdjusting the Regulator Natural GAS only Engine Governor Adjustment1 7 KW Units 2 12 KW and 15 KW Units Voltage Regulator AdjustmentAutomatic Transfer Operation BREAK-IN Procedure‹ 3.2.3 Manual Position ‹ 3.2.1 Auto PositionManual Transfer Operation Sequence of Automatic Operation‹ 3.5.2 Transfer Back to Utility Power Source Setting the Exercise Timer‹ 3.7.1 LOW OIL Pressure Switch ‹ 3.7.2 High Temperature SwitchChecking the Engine OIL Level Approximate Crank Cycle Times‹ 3.7.4 Overspeed Changing the Engine OIL ‹ 4.3.2 OIL Change ProcedureChanging the OIL Filter ‹ 4.3.1 Engine OIL RecommendationsSpark Plugs Battery MaintenanceCooling System Adjusting GH-410/GT-990 Valve Clearance‹ 4.12.1 Removal from Service OUT of Service Procedure‹ 4.12.2 Return to Service Corrosion ProtectionSYSTEM/COMPONENT Procedure Frequency Service ScheduleProblem Cause Correction Troubleshooting GuideElectrical Data Customer Battery Utility Battery Charger Utility Connection BCR Customer Connections Neutral Exploded Views and Parts Lists Part NO.QTY. Description Exploded Views and Parts Lists QTY Description Exploded Views and Parts Lists BOX GTS Load Center Exploded Views and Parts Lists COVER, 12 Position GTS Load Center Kit Contains BUSHING, Governor Lower 138 122 KNOB, AIR Cleaner 28 31 ADAPTOR, Engine Exploded Views and Parts Lists Stator 12KW Exploded Views and Parts Lists ASSEMBLY, Connecting ROD Exploded Views and Parts Lists SCREW, Taptite M6-1.0X8 Yellow Chrome Engine only Mounting Dimensions Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators Your Warranty Rights and Obligations MANUFACTURER’S Emission Control System Warranty CoveragePURCHASER’S/OWNER’S Warranty Responsibilities Emission Related Parts Include the Following Emission Control System WarrantyThis Warranty Shall not Apply to the Following Warranty Schedule

04389-1, 04456-1, 04390-1 specifications

Generac Power Systems is synonymous with reliable and innovative power solutions for both residential and commercial applications. Among its diverse product lineup, the Generac 04390-1, 04456-1, and 04389-1 stand out due to their robust features, advanced technologies, and user-focused characteristics.

The Generac 04390-1 is a portable generator designed for versatility and efficiency. It is equipped with a powerful OHV engine that enables it to deliver up to 3500 running watts and 4375 starting watts, making it suitable for various applications, such as home backup during outages or powering tools on job sites. The generator features a built-in PowerRUSH technology, which provides a 40% more starting capacity than traditional models, allowing it to handle more demanding appliances and tools simultaneously. Additionally, its lightweight and compact design enhance portability, complemented by a sturdy handle and flat-free wheels.

Moving on to the Generac 04456-1, this model offers a greater output with 7500 running watts and 9400 starting watts. Ideal for larger homes or work environments, it is powered by a heavy-duty, 420cc engine and designed for optimal performance. The unit incorporates an electric start feature for easy operation and includes a low-oil shutdown system that protects the engine from damage, providing peace of mind to users. The reinforced roll-cage design ensures durability, while its quiet operation keeps noise levels to a minimum, making it suitable for more noise-sensitive environments.

Lastly, the Generac 04389-1 generator is particularly characterized by its dual-fuel capability, allowing users to run it on either gasoline or propane. This flexibility ensures seamless operation in various situations, with 5500 running watts on gasoline and 4950 running watts on propane. The model’s advanced engineering includes an easy-to-read fuel gauge, ensuring that users can monitor fuel levels without hassle. This generator is also equipped with a heavy-duty, full-wrap steel frame for resistance against impacts and wear, making it perfect for outdoor use.

Collectively, the Generac 04390-1, 04456-1, and 04389-1 models embody a commitment to quality and innovation. With their powerful engines, enhanced technologies, and user-friendly features, these generators provide peace of mind through reliable power solutions, catering to a multitude of needs for both residential and commercial users alike. Whether for emergency backup or regular use, Generac’s offerings ensure that power is always on hand when it’s needed the most.
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