Guardian Technologies 04390-2, 04389-2 Adjusting the Regulator Natural GAS only, Adjustment Screw

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Section 2 — Post Installation Start-up and Adjustments

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

5.Turn ON the utility power supply to the transfer switch, using the means provided (such as a util- ity main line circuit breaker).

6.Set the AUTO/OFF/MANUAL switch to AUTO. The system is now ready for automatic operation.

7.Turn OFF the utility power supply to the transfer switch.

With the AUTO/OFF/MANUAL switch at AUTO, the engine should crank and start when the utility source power is turned OFF. After starting, the transfer switch should connect load circuits to the standby side. Let the system go through its entire automatic sequence of operation.

5.The fuel regulator is fitted with one (7 kW), or two (12 & 15 kW) adjustment screws. While watching the frequency meter, slowly turn the adjustment screws clockwise or counterclockwise one at a time until the highest frequency is read on the meter. Only limited adjustment is available between the set pins (7 kW only). Under no cir- cumstances should any of the pins be removed (Figures 2.1 and 2.2).

Figure 2.1 — Dual Fuel Regulators

990

410

With the generator running and loads powered by generator AC output, turn ON the utility power sup- ply to the transfer switch. The following should occur:

After about six seconds, the switch should transfer loads back to the utility power source.

About one minute after retransfer, the engine should shut down.

2.6ADJUSTING THE REGULATOR

(NATURAL GAS ONLY)

Although the generator has been factory set to pro- vide maximum power, it may be necessary in some areas to adjust this setting. Because natural gas has different BTU or power content across the country the engine may not perform as designed.

If experiencing engine problems at high or full load conditions follow these steps. It will require a fre- quency meter to perform this procedure.

1. Turn off utility power to the main distribution panel in the house. This can be done by switching the service main breaker to the off or open posi- tion.

2. Allow the generator to start. Before loading the generator, confirm that the No Load Frequency, with the roof open and door off, is set to 63-63.5 Hz. Transfer load to emergency circuits.

3. Turn on appliances, lights, pumps, etc., that are on the emergency circuits in an attempt to fully load the generator. Be cautious not to overload the generator. Use the following chart as a guide:

 

Unit

120 Volts

240 Volts

 

 

7 kW

50.0 amps

25.0 amps

 

 

12 kW

100.0 amps

50.0 amps

 

 

13 kW

108.3 amps

54.1 amps

 

 

 

 

 

 

4. When full load has been achieved. Connect a fre- quency meter to the output lugs of the generator’s main line circuit breaker.

12 Generac® Power Systems, Inc.

Adjustment

Adjustment

Set

Screw

Pins

Screw

(One Side

 

(Both sides)

 

Only)

 

 

 

6.When the highest frequency is reached maximum power has been set. From this point turn both adjustment screws 1/4 turn counterclockwise. The regulator is now set.

Figure 2.2 — Placement of Regulator

Adjustment Screw

7.Turn utility power to the main distribution panel back on. This can be done by switching the serv- ice main breaker to the on or closed position. Allow the generator to shut down.

Do not make any unnecessary adjustments.

!Factory settings are correct for most applica- tions. However, when making adjustments, be careful to avoid overspeeding the engine.

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Contents Installation Introduction Authorized Dealer LocationTroubleshooting Post Installation Start-up AdjustmentsMaintenance Introduction Inside Front CoverGeneral Hazards Electrical Hazards ‹ Standards IndexBreaker for Bedrooms UNPACKING/INSPECTIONProtection Systems Generator 7 kW, Single Cylinder GH-410 Engine‹ 1.5.2 Engine Specifications‹ 1.5.1 Generator Fuel Requirements Recommendations Reconfiguring the Fuel SystemSystem SET LED Fuel Consumption2 12KW and 15KW, 990CC Engines Transfer SwitchLocation GeneratorBattery Installation BatteryElectrical Checks Check Transfer Switch OperationBefore Initial START-UP Generator Tests Under Load Checking Automatic OperationAdjusting the Regulator Natural GAS only Adjustment Screw2 12 KW and 15 KW Units Voltage Regulator Adjustment1 7 KW Units ‹ 3.2.1 Auto Position BREAK-IN ProcedureAutomatic Transfer Operation ‹ 3.2.2 OFF PositionManual Transfer Operation Sequence of Automatic Operation‹ 3.7.1 LOW OIL Pressure Switch Setting the Exercise Timer‹ 3.5.2 Transfer Back to Utility Power Source ‹ 3.7.2 High Temperature Switch‹ 3.7.4 Overspeed Checking the Engine OIL LevelApproximate Crank Cycle Times Changing the OIL Filter ‹ 4.3.2 OIL Change ProcedureChanging the Engine OIL ‹ 4.3.1 Engine OIL RecommendationsBattery Maintenance Spark PlugsAdjusting GH-410/GT-990 Valve Clearance Cooling System‹ 4.12.2 Return to Service OUT of Service Procedure‹ 4.12.1 Removal from Service Corrosion ProtectionService Schedule Be performed by the nearest Guardian Authorized DealerTroubleshooting Guide Problem Cause CorrectionElectrical Data Customer Battery Utility Battery Charger Utility Connection BCR SW1 Exploded Views and Parts Lists QTY Description Exploded Views and Parts Lists Circuit Breaker 40A X 2P Exploded Views and Parts Lists BOX GTS Load Center Exploded Views and Parts Lists COVER, 12 Position GTS Load Center 140 Sleeve Exploded Views and Parts Lists KNOB, AIR Cleaner 28 31 ADAPTOR, Engine Exploded Views and Parts Lists Stator 12KW Exploded Views and Parts Lists PIN, Piston D20 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 PURCHASER’S/OWNER’S Warranty Responsibilities Your Warranty Rights and ObligationsMANUFACTURER’S Emission Control System Warranty Coverage Emission Control System Warranty Emission Related Parts Include the FollowingWarranty Schedule