Generac Power Systems 04758-2, 04759-2, 04760-2 Fuel Requirements And Recommendations, Danger

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1.6FUEL REQUIREMENTS

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 1.9 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 the fuel.

Required fuel pressure for natural gas is 5 inches to 7 inches water colum (0.18 to 0.25 psi); and for liquid propane, 11 inches to 14 inches of water column (0.4 to 0.5 psi).

NOTE:

Any piping used to connect the generator to the fuel supply should be of adequate size to ensure the fuel pressure NEVER drops below 4 inches water colum for natural gas or 10 inches water col- umn for liquid propane for all load ranges.

1.7FUEL CONSUMPTION

Model #

Nat. Gas (*)

LP Vapor (**)

 

1/2 Load

Full Load

1/2 Load

Full Load

04758

66

119

0.82/30

1.47/54

04759

152

215

1.53/56

2.08/76

04760

156

220

1.58/58

2.40/88

1.8RECONFIGURING THE FUEL SYSTEM

◆1.8.1 7 KW, 410CC

To reconfigure the fuel system from NG to LP, follow these steps (Figure 1.3):

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 (0.4 to 0.5 psi) to the fuel inlet of the generator MUST BE SUPPLIED.

1.Turn off the main gas supply (if connected).

2.Open the roof and remove the door.

3.Remove the battery (if installed).

4.Disconnect wire #0 and wire #14 from the gas solenoid on top of the demand regulator.

5.Remove the carburetor fuel hose from the outlet port of the demand regulator.

6.Remove the demand regulator by removing the fastener that retains the regulator mounting bracket.

7.Remove the square headed steel pipe plug from outlet port #1 and the brass hose barb fitting from outlet port #2.

8.Refit the brass hose barb fitting to outlet port #1 and the square headed steel pipe plug to outlet port #2.

9.Reverse procedure steps 1-5 to reinstall demand regulator.

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

Figure 1.3 – Demand Regulator

*Natural gas is in cubic feet per hour.

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

1.7FUEL CONSUMPTION1.8RECONFIGURING THE FUEL SYSTEM 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.

FUEL HOSE

BRASS HOSE FITTING ◆1.8.1 7 KW, 410CC

ADJUSTMENT SCREW Figure 1.3 – Demand Regulator

HOSE & PLUG

SWITCHED SIDES

PIPE

FUEL HOSE

PLUG

 

BRASS HOSE

DANGER FITTING

OUTLET

PORT

Manual background FUEL JET

NG FUEL SYSTEM

LP FUEL SYSTEM

NOTE:

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

Generac® Power Systems, Inc. 7

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Contents 04760-2 13 kW NG, 15 kW LP Models 04758-2 6 kW NG, 7 kW LP 04759-2 12 kW NG, 12 kW LPThis manual should remain with the unit Installation and Owner’s Manual‹ OPERATION AND MAINTENANCE ‹ CONTENTS‹ HOW TO OBTAIN SERVICE INTRODUCTIONIntroduction Despite the safe design of this generator GENERAL HAZARDSParts of the generator are rotating and/or hot during operation. Exercise care near running generatorsFIRE HAZARDS ELECTRICAL HAZARDSEXPLOSION HAZARDS ‹ STANDARDS INDEX1.2 PROTECTION SYSTEMS 1.1 UNPACKING/INSPECTION1.3 SYSTEM SET LED DANGER1.4 THE GENERATOR Figure 1.1 - 7 kW, Single Cylinder GH-410 EngineFigure 1.2 - 12 kW/15 kW, V-twin GT-990/760 Engine 1.5 SPECIFICATIONS ‹ 1.5.1 GENERATOR‹ 1.5.2 ENGINE 1.6 FUEL REQUIREMENTS AND RECOMMENDATIONS 1.8 RECONFIGURING THE FUEL SYSTEM1.7 FUEL CONSUMPTION DANGER1.8.2 12KW AND 15KW, 990CC ENGINES 1.9 LOCATION1.9.1 GENERATOR Figure 1.4 - Demand Regulator1.11 THE BATTERY 1.10 BATTERY INSTALLATION1.9.2 TRANSFER SWITCH 1.9.2.1 7 kW, 12 kW and 15 kW Units Figure 1.5 - Battery Cable Connections2.2 CHECK TRANSFER SWITCH OPERATION 2.1 BEFORE INITIAL START-UP2.3 ELECTRICAL CHECKS 2.5 CHECKING AUTOMATIC OPERATION 2.4 GENERATOR TESTS UNDER LOAD2.6 ADJUSTING THE REGULATOR NATURAL GAS ONLY Figure 2.2 - Placement of RegulatorFigure 2.1 - Dual Fuel Regulators Figure 2.4 - V-twin Engine Governor Adjustment 2.7 ENGINE GOVERNOR ADJUSTMENTFigure 2.3 - Single Cylinder Engine Governor Adjustment Figure 2.5 - V-twin Full Load Speed Adjust Screw3.1 BREAK-IN PROCEDURE 2.8 VOLTAGE REGULATOR ADJUSTMENT3.2 USING THE AUTO/OFF/MANUAL SWITCH FIGURE Figure 2.6 - Voltage Adjustment Potentiometer3.5 MANUAL TRANSFER OPERATION 3.3 AUTOMATIC TRANSFER OPERATION3.4 SEQUENCE OF AUTOMATIC OPERATION ‹ 3.5.1 TRANSFER TO GENERATOR POWER SOURCE‹ 3.7.1 LOW OIL PRESSURE SWITCH ‹ 3.5.2 TRANSFER BACK TO UTILITY POWER SOURCE‹ 3.7.2 HIGH TEMPERATURE SWITCH Figure 3.2 - Manual Transfer Switch Operation4.2 CHECKING THE ENGINE OIL LEVEL Figure 3.3 - Low Oil Pressure and High Temperature Switches4.1 FUSE ‹ 3.7.3 OVERCRANK‹ 4.3.2 OIL CHANGE PROCEDURE 4.5 CHANGING THE ENGINE AIR CLEANER4.3 CHANGING THE ENGINE OIL 4.4 CHANGING THE OIL FILTERFigure 4.6 - 7 kW, Engine Air Cleaner Location 4.7 BATTERY MAINTENANCEFigure 4.7 - 12 kW and 15 kW Engine Air Cleaner Figure 4.8 - Setting the Spark Plug Gap4.8 ADJUSTING VALVE CLEARANCE Figure 4.10 - Valve Clearance Adjustment4.9 COOLING SYSTEM ‹ 4.12.2 RETURN TO SERVICE 4.12 OUT OF SERVICE PROCEDURE‹ 4.12.1 REMOVAL FROM SERVICE 4.10 ATTENTION AFTER SUBMERSION4.13 SERVICE SCHEDULE PROBLEM 5.1 TROUBLESHOOTING GUIDECAUSE CORRECTION24 Generac Power Systems, Inc ENGINE WIRINGSection 6 - Electrical Data CONTROL PANEL BOX CUSTOMERCONNECTION 26 Generac Power Systems, Inc Electrical Schematic - 12 & 15 kW - Drawing No. 0D8501-BSection 6 - Electrical Data Section 6 - Electrical Data 28 Generac Power Systems, IncSection 6 - Electrical Data 30 Generac Power Systems, Inc 225A224A Electrical Schematic - 7 kW - Drawing No. 0D9014-C 32 Generac Power Systems, Inc Section 7 - Exploded Views and Parts ListsPART NO. QTY. DESCRIPTION 34 Generac Power Systems, Inc Section 7 - Exploded Views and Parts Lists 36 Generac Power Systems, Inc 27, 2835, 36, 40 DESCRIPTION PART NO. QTY38 Generac Power Systems, Inc Section 7 - Exploded Views and Parts Lists 14 20 40 Generac Power Systems, Inc1.25 FT 1.8 FT42 Generac Power Systems, Inc 2.6 FT 3 FT1.33 FT 44 Generac Power Systems, Inc DESCRIPTION 46 Generac Power Systems, Inc DESCRIPTION 48 Generac Power Systems, Inc DESCRIPTION ALL DIMENSIONS IN MILLIMETERS INCHES 50 Generac Power Systems, IncSection 8 - Mounting Guardian Air-cooled 7 kW, 12 Drawing No. 0D3739-BSection 9 - Notes MANUFACTURER’S EMISSION CONTROL SYSTEM WARRANTY COVERAGE YOUR WARRANTY RIGHTS AND OBLIGATIONSPURCHASER’S/OWNER’S WARRANTY RESPONSIBILITIES CALIFORNIA AND FEDERAL EMISSION CONTROL WARRANTY STATEMENTEMISSION RELATED PARTS INCLUDE THE FOLLOWING EMISSION CONTROL SYSTEM WARRANTYPREPACKAGED EMERGENCY AUTOMATIC STANDBY GENERATORS GENERAC POWER SYSTEMS TWO YEAR LIMITED WARRANTY FOR GUARDIANWARRANTY SCHEDULE THIS WARRANTY SHALL NOT APPLY TO THE FOLLOWING
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