Section 2 — Post Installation Start-up and Adjustments

Generac 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 not to proceed until certain that generator AC voltage and frequency are correct and within the stated limits. Generally, if both AC frequency and voltage are high or low, the engine governor requires adjustment. If frequency is cor- rect, 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.Manually set the transfer switch to the UTILITY position, i.e., load terminals connected to the util- ity power source side.

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

5.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.

6.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 generator AC output, turn ON the utility power sup- ply to the transfer switch. The following should occur:

•After about 15 seconds, the switch should transfer loads back to the utility power source.

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

Generac® Power Systems, Inc. 11

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Generac 04675-3, 04673-2, 04674-2 owner manual Generator Tests Under Load, Checking Automatic Operation
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04674-2, 04675-3, 04673-2 specifications

Generac, a prominent name in the power equipment sector, offers a range of reliable and efficient energy solutions, including the models Generac 04673-2, 04675-3, and 04674-2. These models are designed to meet diverse consumer needs, from residential applications to larger commercial setups, providing dependable backup power during outages.

The Generac 04673-2 is a standout home standby generator specifically engineered for residential use. It boasts an automatic operation feature, ensuring that power is restored within seconds of an outage. This model operates on a robust Generac engine, delivering a reliable power output that can support essential household appliances and systems, including HVAC units, refrigerators, and sump pumps. One of the main characteristics of this generator is its Quiet Test mode, which runs at a lower RPM to minimize noise while conducting weekly self-tests, ensuring that the system is always ready when needed.

Moving on to the Generac 04675-3, this model offers enhanced features tailored for users needing higher power output. With a larger capacity, it can handle more demanding power needs, making it suitable for larger homes or small businesses. The 04675-3 is equipped with advanced technologies, including the Mobile Link™ remote monitoring system, which enables users to check the status and performance of their generator from anywhere using a smartphone or computer. This connectivity empowers users with real-time information and alerts regarding their generator's operational performance.

The Generac 04674-2 model rounds out the trio, engineered for those who need a powerful standby generator with a slightly different configuration. It features the same robust engine as the other models, ensuring reliability and user-friendly operation. Its standout feature is the integrated transfer switch capability, which allows for seamless transfer of power from the grid to the generator without manual intervention. This model also supports various fuel types, providing flexibility depending on user preference and availability.

All three Generac models focus on safety and efficiency, incorporating features such as excellent ventilation systems, all-weather enclosures, and user-friendly control panels. They are designed for low maintenance, ensuring long-lasting performance without extensive upkeep. With Generac's commitment to innovation and quality, these generators offer peace of mind, enabling users to maintain their lifestyles and operations without interruption during power outages. Whether for home or business use, the Generac 04673-2, 04675-3, and 04674-2 models represent a reliable choice in emergency power solutions.
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