Section 3 — Operation

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

5.Use the manual transfer handle inside the trans- fer switch to move the main contacts back to their UTILITY position, i.e., loads connected to the util- ity power source (Figure 3.2).

6.Turn ON the utility power supply to the transfer switch using the means provided.

7.Set the system to automatic operation as outlined in “Automatic Transfer Operation,” Section 3.3.

‹3.7.2 HIGH TEMPERATURE SWITCH

This switch’s contacts (Figure 3.3) close if the tem- perature should exceed approximately 140º C (284º F), initiating an engine shutdown. The generator will automatically restart and the LED on the generator control panel will reset once the temperature has returned to a safe operating level.

3.6SETTING THE EXERCISE TIMER

This generator is equipped with an exercise timer. Once it is set, the generator will start and exercise once every seven days, on the day of the week and at the time of day the following sequence is completed. During this exercise period, the unit runs for approx- imately 12 minutes and then shuts down. Transfer of loads to the generator output does not occur during the exercise cycle.

A switch on the control panel (see Figure 3.1) per- mits selection of the day and time for the system to exercise. At the chosen time, perform the following sequence to select the desired day and time of day the system will exercise.

1.Verify that the AUTO/OFF/MANUAL switch is set to AUTO.

2.Hold down the “Set Exercise Time” switch until the generator starts (approximately 10 seconds) and then release.

3.The generator will start and run for approximate- ly 12 minutes and then shut down on its own. The exerciser will then be set to run at that time of day every week.

NOTE:

The exerciser will only work in the AUTO mode and will not work unless this procedure is per- formed. The exerciser will need to be reset every time the 12-volt battery is disconnected and then reconnected.

The exerciser WILL NOT work if dip switch 2 on the controller printed circuit board (Remote Not Auto) is ON.

3.7PROTECTION SYSTEMS

‹3.7.1 LOW OIL PRESSURE SWITCH

This switch (Figure 3.3) has normally closed con- tacts that are held open by engine oil pressure dur- ing cranking and operating. Should oil pressure drop below the 8 psi range, switch contacts close, and the engine shuts down. The unit should not be restarted until oil is added. The AUTO/OFF/MANUAL switch must then be turned to OFF and then back to AUTO.

Figure 3.3 – Low Oil Pressure and

High Temperature Switches

Low Oil Switch

High Temp Switch

Loosen

Oil

Drain

Hose

Oil Filter

‹3.7.3 OVERCRANK

This feature prevents the generator from damaging itself when it continually attempts to start and anoth- er problem, such as no fuel supply, prevents it from starting. The unit will crank and rest for a preset time limit. Then, it will stop cranking, and the LED on the generator control panel will light indicating an overcrank failure. The AUTO/OFF/MANUAL switch will need to be set to OFF and then back to AUTO to reset the generator control board.

NOTE:

If the fault is not repaired, the overcrank feature will continue to activate.

3.7.3.1 Approximate Crank Cycle Times

•15 seconds ON

•7 seconds OFF

•7 seconds ON

•7 seconds OFF

•Repeat for 45 seconds Approximately 90 seconds total

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Generac Power Systems 04389-3, 04456-3, 04390-3 owner manual Setting the Exercise Timer, ‹ 3.7.2 High Temperature Switch
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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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