Generac Power Systems 04759-0, 04758-0 Generator Tests Under Load, Checking Automatic Operation

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Section 2 — Post Installation Start-up and Adjustments

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

8.Connect an accurate AC voltmeter and a frequen- cy meter across transfer switch terminal lugs E1 and E2. Voltage should be 242-252 volts; fre- quency should read about 61-63 Hertz.

9.Connect the AC voltmeter test leads across termi- nal lug E1 and neutral; then across E2 and neu- tral. In both cases, voltage reading should be 121- 126 volts AC.

10.Set the generator’s main circuit breaker to its OFF (or open) position. Let the engine run at no- load for a few minutes to stabilize internal engine generator temperatures.

11.Set the generator's Auto/Off/Manual switch to OFF. The engine should shut down.

NOTE:

It is important that you do not proceed until you are certain that generator AC voltage and frequen- cy are correct and within the stated limits. Generally, if both AC frequency and voltage are high or low, the engine governor requires adjust- ment. If frequency is correct, but voltage is high or low, the generator’s voltage regulator requires adjustment.

2.4GENERATOR TESTS UNDER LOAD

To test the generator set with electrical loads applied, proceed as follows:

1.Set generator’s main circuit breaker to its OFF (or open) position.

2.Set the generator's Auto/Off/Manual switch to OFF.

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

Do not attempt manual transfer switch opera- tion until all power voltage supplies to the transfer switch have been positively turned off. Failure to turn off all power voltage supplies will result in extremely hazardous and possibly fatal electrical shock.

4.Manually set the transfer switch to the STANDBY position, i.e., load terminals connected to the generator's E1/E2 terminals. The transfer switch operating lever should be down.

5.Set the generator's Auto/Off/Manual switch to MANUAL. The engine should crank and start immediately.

6.Let the engine stabilize and warm up for a few minutes.

7.Set the generator’s main circuit breaker to its ON (or closed) position. Loads are now powered by the standby generator.

8.Turn ON electrical loads. Apply an electrical load equal to the full rated wattage/amperage capacity of the installed generator.

9.Connect an accurate AC voltmeter and a frequen- cy meter across terminal lugs E1 and E2. Voltage should be greater than 230 volts; frequency should be greater than 58 Hertz.

10.Let the generator run at full rated load for 20-30 minutes. Listen for unusual noises, vibration or other indications of abnormal operation. Check for oil leaks, evidence of overheating, etc.

11.When testing under load is complete, turn OFF electrical loads.

12.Set the generator's main circuit breakers to their OFF (or open) positions.

13.Let the engine run at no-load for a few minutes.

14.Set the Auto/Off/Manual switch to OFF. The engine should shut down.

2.5CHECKING AUTOMATIC

OPERATION

To check the system for proper automatic operation, proceed as follows:

1.Set the generator’s main circuit breaker to it’s OFF (or open) position.

2.Check that the Auto/Off/Manual switch is set to OFF.

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

4.Manually set the transfer switch to the UTILITY position, i.e., load terminals connected to the util- ity power source side.

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. Then set the generator’s main circuit breaker to its ON (or closed) position. 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.

With the generator running and loads powered by gen- erator AC output, turn ON the utility power supply 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.

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Contents Installation Introduction Maintenance Post Installation Start-up AdjustmentsTroubleshooting Introduction Inside Front CoverGeneral Hazards ‹ Standards Index Electrical HazardsProtection Systems UNPACKING/INSPECTIONSystem SET LED 7 kW, Single Cylinder GH-410 Engine Your Generator‹ 1.5.1 Generator Specifications‹ 1.5.2 Engine Fuel Requirements Recommendations Reconfiguring the Fuel SystemFuel Consumption 2 12KW and 15KW, 990CC EnginesLocation Transfer SwitchGenerator 2.1 7 kW, 12 kW and 15 kW UnitsBattery Battery InstallationBefore Initial START-UP Check Transfer Switch OperationElectrical Checks Checking Automatic Operation Generator Tests Under LoadEngine Governor Adjustment Adjusting the Regulator Natural GAS only1 7 KW Units BREAK-IN Procedure Voltage Regulator Adjustment2 12 KW and 15 KW Units Sequence of Automatic Operation Automatic Transfer Operation‹ 3.2.1 Auto Position ‹ 3.2.2 OFF PositionManual Transfer Operation ‹ 3.5.2 Transfer Back to Utility Power Source‹ 3.7.1 LOW OIL Pressure Switch Setting the Exercise Timer‹ 3.7.2 High Temperature Switch ‹ 3.7.3 OvercrankChanging the Engine OIL Checking the Engine OIL Level‹ 4.3.1 Engine OIL Recommendations Changing the OIL Filter ‹ 4.3.2 OIL Change Procedure‹ 4.5.1 7 KW, 12 KW and 15 KW Generators Spark Plugs Battery MaintenanceCooling System Adjusting Valve Clearance‹ 4.12.2 Return to Service OUT of Service Procedure‹ 4.12.1 Removal from Service Corrosion ProtectionBe performed by your nearest Generac Authorized Dealer Service ScheduleProblem Cause Correction Troubleshooting GuideElectrical Data Customer Connection SM Starter Motor 1VA Engine Wiring Control Panel BOX SP Spark Plug Customer Connections Exploded Views and Parts Lists Part NO. QTY Description Exploded Views and Parts Lists Part NO. QTY. Description Kit Contains QTY Description 122 138 125 139 136 135 123 120 137 124 133 119 117 114 121 QTY Description 45 30 ADAPTOR, Engine Exploded Views and Parts Lists Stator 12KW 40 22 ASSEMBLY, Connecting ROD Exploded Views and Parts Lists SCREW, Taptite M6-1.0X8 Yellow Chrome For GT 760 Engine only CASTING, Twin Regulator Housing Mounting Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators California and Federal Emission Control Warranty Statement Emission Control System Warranty This Warranty Shall not Apply to the Following Warranty Schedule

04760-0, 04759-0, 04758-0 specifications

Generac Power Systems is a leading manufacturer in the field of power generation, known for its innovative products that cater to both residential and commercial customers. Among its prominent offerings, the Generac models 04758-0, 04759-0, and 04760-0 stand out as essential solutions for backup energy needs. These units offer reliable power during outages, ensuring that homes and businesses remain operational regardless of external conditions.

The Generac 04758-0 is a robust standby generator designed for residential use. Featuring a powerful engine, it delivers a dependable power output when it is needed most. Key characteristics include an automatic transfer switch that detects power loss and activates the generator without user intervention. This means that homeowners can enjoy peace of mind knowing that their essential appliances and systems will continue to function seamlessly during outages. Additionally, its compact design allows for easy installation in most home settings.

Moving on to the Generac 04759-0, this model offers even greater power capacity, making it suitable for larger homes or small businesses. It incorporates advanced technologies such as digital power management, which optimizes fuel efficiency and reduces emissions. The O47-59-0 is also known for its durable construction, providing reliable performance in various weather conditions. Its user-friendly interface allows for straightforward operation and monitoring, ensuring users remain informed about their power status.

The Generac 04760-0 takes it a step further by enhancing its overall performance with innovations in noise reduction and fuel consumption. It is engineered with a leading-edge cooling system that minimizes operational noise, making it ideal for residential neighborhoods where sound regulations are a concern. This model is also compatible with a variety of fuels, giving users flexibility based on availability and cost. Its comprehensive warranty further underscores Generac's commitment to customer satisfaction and product reliability.

In summary, the Generac Power Systems models 04758-0, 04759-0, and 04760-0 exemplify technology and engineering excellence in the power generation industry. With features designed for efficiency, durability, and user convenience, these models provide steadfast support to users seeking dependable backup power solutions. Whether for a home or small business, Generac's offerings remain a trusted choice for managing unexpected power outages.
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