Generac 04389-1, 04456-1, 04390-1 2.8VOLTAGE REGULATOR ADJUSTMENT, 3.1BREAK-INPROCEDURE

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◆2.7.2 12 KW AND 15 KW UNITS

Section 3 — Operation

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

2.7.2 12 KW AND 15 KW UNITS

1.Loosen governor clamp bolt (See Figure 2.3).

2.Completely remove the idle spring.

3.With governor arm at wide open throttle position, rotate governor shaft fully clockwise. Tighten clamp bolt to 84 inch-pounds.

4.Start unit and apply full load. Use full load speed adjust screw (Figure 2.4) to adjust frequency to 58 Hz.

5.Remove load, stop engine, loosen the idle adjust screw and reconnect the idle spring.

6.Using your hand, push the governor arm to the closed throttle position. Make sure the idle spring does not stretch at all.

7.Restart the unit.

8.Slowly turn the idle adjust screw to adjust the no- load idle frequency to 63-63.5 Hz (with door open).

9.The governor is now set.

Figure 2.4 — Full Load Speed Adjust Screw

Full Load Speed Adjust Screw

2.7.3 ADDITIONAL CORROSION PROTECTION

Periodically spray all engine linkage parts and brack- ets with corrosion inhibiting spray such as WD-40 or a comparable product.

2.8VOLTAGE REGULATOR

ADJUSTMENT

With the frequency between 62-63 Hertz, slowly turn the slotted potentiometer (Figure 2.5) until line volt- age reads 247-252 volts.

NOTE:

You must remove the access panel on top of the control panel to adjust the voltage regulator.

Figure 2.5 – Voltage Adjustment Potentiometer

NOTE:

The voltage regulator is housed above the genera- tor's control panel. The regulator maintains a volt- age in direct proportion to frequency at a 2-to-1 ratio. For example, at 62 Hertz, line-to-neutral voltage will be 124 volts.

3.1BREAK-IN PROCEDURE

Once the unit has been installed and all electrical checks have been made, it is strongly recommended that the following “Break-in Procedure” be completed to ensure correct generator operation in the future.

1.Set the generator’s Auto/Off/Manual switch to AUTO.

2.Turn OFF the utility power supply to the transfer switch using the means provided (such as a utili- ty main line circuit breaker).

3.The unit will start, and the transfer switch will transfer to standby.

4.Using the transfer switch’s built-in emergency load center, turn on circuits to load the generator to approximately 25% rated load and run the unit for one hour.

5.Run the unit for one hour at 50% rated load.

6.Run the unit for one hour at 75% rated load.

7.Run the unit for one hour at 100% rated load.

8.Turn ON the utility power supply to the transfer switch, which will allow the transfer switch to transfer back to utility power. The unit will con- tinue to run for one minute and then shut down.

9.Allow the unit to cool.

10.Set the generator's Auto/Off/Manual switch to OFF. Remove the 5A and 15A fuses from the gen- erator control panel. Disconnect the battery cables as outlined in “General Hazards” (page 2).

Generac® Power Systems, Inc. 13

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Contents DANGER POWER SYSTEMS, INCDEADLY EXHAUST FUMES. OUTDOOR INSTALLATION ONLY POWER SYSTEMS‹CONTENTS INTRODUCTIONAUTHORIZED DEALER LOCATION DANGERIntroduction GENERAL HAZARDS Despite the safe design of this generatorParts of the generator are rotating and/or hot ‹STANDARDS INDEX ELECTRICAL HAZARDSFIRE HAZARDS EXPLOSION HAZARDS1.1UNPACKING/INSPECTION 1.2PROTECTION SYSTEMS1.3SYSTEM SET LED 1.4YOUR GENERATOR Figure 1.1 - 7 kW, Single Cylinder GH-410EngineFigure 1.2 - 12 kW and 15 kW, V-twin GT-990Engine 1.5 SPECIFICATIONS ‹ 1.5.1 GENERATOR‹1.5.2 ENGINE DANGER 1.8RECONFIGURING THE FUEL SYSTEM1.6FUEL REQUIREMENTS AND RECOMMENDATIONS 1.7FUEL CONSUMPTION1.9.1 GENERATOR 1.10 BATTERY INSTALLATION1.9LOCATION 1.9.2 TRANSFER SWITCHDo not open or mutilate the battery. Released 1.11 THE BATTERYFigure 1.5 - Battery Cable Connections Wear rubber gloves and bootsNever operate the engine with the oil level 2.2CHECK TRANSFER SWITCH OPERATION2.1BEFORE INITIAL START-UP 2.3ELECTRICAL CHECKS2.6ADJUSTING THE REGULATOR NATURAL GAS ONLY 2.4GENERATOR TESTS UNDER LOAD2.5CHECKING AUTOMATIC OPERATION Do not make any unnecessary adjustments 2.7ENGINE GOVERNOR ADJUSTMENTFigure 2.2 - Placement of Regulator Figure 2.3 - Engine Governor AdjustmentFigure 2.5 - Voltage Adjustment Potentiometer 2.8VOLTAGE REGULATOR ADJUSTMENT3.1BREAK-INPROCEDURE Figure 2.4 - Full Load Speed Adjust Screw3.4SEQUENCE OF AUTOMATIC OPERATION 3.3AUTOMATIC TRANSFER OPERATION3.2USING THE AUTO/OFF/MANUAL SWITCH FIGURE With the switch set to AUTO, the engine mayFigure 3.2 - Manual Transfer Switch Operation 3.6SETTING THE EXERCISE TIMER3.5MANUAL TRANSFER OPERATION ‹3.5.2 TRANSFER BACK TO UTILITY POWER SOURCE‹3.7.2 HIGH TEMPERATURE SWITCH 3.7PROTECTION SYSTEMS4.1FUSE ‹3.7.1 LOW OIL PRESSURE SWITCH‹4.3.1 ENGINE OIL RECOMMENDATIONS 4.2CHECKING THE ENGINE OIL LEVEL4.3CHANGING THE ENGINE OIL ‹ 4.3.2 OIL CHANGE PROCEDUREFigure 4.6 - 7 kW, Engine Air Cleaner Location 4.5CHANGING THE ENGINE AIR CLEANER4.4CHANGING THE OIL FILTER 4.6SPARK PLUGS4.7BATTERY MAINTENANCE 4.8ADJUSTING GH-410/GT-990VALVE CLEARANCEFigure 4.8 - Setting the Spark Plug Gap Figure 4.10 - Valve Clearance Adjustment 4.9COOLING SYSTEM4.10 ATTENTION AFTER SUBMERSION 4.11 CORROSION PROTECTION4.12 OUT OF SERVICE PROCEDURE ‹4.12.1 REMOVAL FROM SERVICE‹4.12.2 RETURN TO SERVICE 4.13 SERVICE SCHEDULE CORRECTION 5.1TROUBLESHOOTING GUIDEPROBLEM CAUSESection 6 - Electrical Data 24 Generac Power Systems, IncCONTROL PANEL BOX CUSTOMERCONNECTION 26 Generac Power Systems, Inc C2-6 28 Generac Power Systems, Inc Wiring Diagram - 7 kW - Drawing No. 0D9013-ACLOSEST TO BEA 4 0 STATOR CUSTOMER CONNECTION30 Generac Power Systems, Inc Generac Power Systems, Inc 32 Generac Power Systems, Inc Section 7 - Exploded Views and Parts ListsPART NO.QTY. DESCRIPTION Control Panel - Drawing No. 0D8503-E DESCRIPTION Section 7 - Exploded Views and Parts Lists 0D4801 37 17 24 0D3086 Kit Contains Section 7 - Exploded Views and Parts Lists 42 Generac Power Systems, Inc Section 7 - Exploded Views and Parts Lists 44 Generac Power Systems, Inc 7 kW Generator - Drawing No. 0D3504-B 46 Generac Power Systems, Inc 12 kW and 15 kW Generator - Drawing No. 0D3417-B 48 Generac Power Systems, Inc GN410 Engine - Drawing No. 0D3539-BPart 50 Generac Power Systems, Inc 0C1069 PART NO. QTY NTAKE Section 8 - Mounting DimensionsTRANSFER SWITCH Guardian Air54 Generac Power Systems, Inc Generac Power Systems, Inc Section 10 - Warranty CALIFORNIA EMISSION CONTROL WARRANTY STATEMENTYOUR WARRANTY RIGHTS AND OBLIGATIONS PURCHASER’S/OWNER’S WARRANTY RESPONSIBILITIESEMISSION RELATED PARTS INCLUDE THE FOLLOWING EMISSION CONTROL SYSTEM WARRANTYWARRANTY SCHEDULE GENERAC POWER SYSTEMS, INCP.O. BOX WHITEWATER, WI