Section 2 — Post Installation Start-up and Adjustments

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

7.When certain that utility supply voltage is compat- ible with transfer switch and load circuit ratings, turn OFF the utility power supply to the transfer switch.

8.On the generator panel, set the AUTO/OFF/ MANUAL switch to MANUAL. The engine should crank and start.

9.Let the engine warm up for about five minutes to allow internal temperatures to stabilize. Then, set the generator’s main circuit breaker to its ON (or CLOSED) position.

DANGER

Proceed with caution! Generator power voltage is now supplied to the transfer switch. Contact with live transfer switch parts will result in dan- gerous and possibly fatal electrical shock.

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

11.Connect the AC voltmeter test leads across ter- minal lug E1 and neutral; then across E2 and neutral. In both cases, voltage reading should be 121-126 volts AC.

12.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.

13.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.Turn OFF all loads connected to the transfer switch terminals T1 and T2.

3.Set the generator's AUTO/OFF/MANUAL switch to OFF.

4.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.

5.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.

6.Set the generator's AUTO/OFF/MANUAL switch to MANUAL. The engine should crank and start immediately.

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

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

9.Turn ON electrical loads connected to transfer switch T1 and T2. Apply an electrical load equal to the full rated wattage/amperage capacity of the installed generator.

10.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.

11.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.

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

13.Set the generator's main circuit breaker to its OFF (or OPEN) position.

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

15.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 generator’s main circuit breaker to its 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 means provided (such as a utility 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.

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Generac Power Systems 04389-3, 04456-3, 04390-3 owner manual Generator Tests Under Load, Checking Automatic Operation
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04389-3, 04456-3, 04390-3 specifications

Generac Power Systems has established itself as a leading name in power generation equipment, and models 04389-3, 04456-3, and 04390-3 exemplify the company’s commitment to reliability and technology. These models are particularly popular among homeowners and businesses that need dependable backup power solutions.

The Generac 04389-3 is a 22 kW standby generator designed to provide seamless power during outages. It boasts a powerful 999cc engine that can handle heavy loads, making it suitable for larger homes or commercial settings. The generator features Generac’s patented True Power Technology, which ensures clean and stable power delivery, making it safe for sensitive electronics. It also comes equipped with an innovative shutdown system that prevents damage during low oil conditions and features a five-year limited warranty for added peace of mind.

Similarly, the 04456-3 model also serves as a robust standby generator, offering 24 kW of power output. This model highlights an advanced alternator that provides a reliable source of energy for running essential appliances like refrigerators, air conditioners, and heating systems. The 04456-3 includes an automatic exercise mode, allowing it to run tests periodically to ensure it’s always ready to operate when needed. Additionally, it utilizes a user-friendly digital controller that simplifies monitoring and operational management.

The Generac 04390-3 model offers a slightly lower output at 20 kW but retains high efficiency and reliability. Like its counterparts, it features an innovative design that operates quietly while delivering consistent power. This model is particularly aimed at residential users who require dependable backup solutions without the noise commonly associated with generators. It incorporates Generac’s Smart Management modules, enabling users to manage power loads effectively and avoid overloading the system.

All three models benefit from Generac’s Mobile Link technology, which enables remote monitoring via mobile devices. This feature allows users to check the status of their generators, including maintenance alerts and operational history, providing a convenient way to manage energy needs. In summary, Generac models 04389-3, 04456-3, and 04390-3 offer cutting-edge features, dependable technology, and robust capabilities, making them an ideal choice for anyone seeking reliable backup power solutions.
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