Engine Protective Devices | Generac Power Systems specification

Section 1 - General Information

Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators

Figure 1.2 - Main Circuit Breaker

Model	Rating	Phase	Actual Current	C/B Rating*	% over rating	Circuit Breaker
004721/004722	15,000	1	62.5	70	112%	70A BQ2
004723/004724	20,000	1	83.3	90	108%	90A BQ2
004725/004726	25,000	1	104.2	125	120%	125A BQ2
			* Amp Rating of CB structured under model.

Recommended fuels should have a Btu content of at least 1,000 Btus per cubic foot for natural gas and at least 2,520 Btus per cubic foot for LP gas. Ask the fuel supplier for the Btu content of the fuel being used.

Fuel pressure for a natural gas set up should be five inches to 14 inches of water column (0.18 to 0.5 psi) at all load ranges.

Fuel pressure for an LP vapor set up should be 11 inches to 14 inches of water column (0.4 to 0.5 psi) at all load ranges.

NOTE:

A seperate gas line and regulator may be needed to assure proper gas pressure to the generator. Improper gas pressure can cause hard starting and affect engine durability.

Gaseous fuels such as natural and LP

!(propane) gas are highly explosive. Even the slightest spark can ignite such fuels and cause an explosion. No leakage of fuel is permitted. Natural gas, which is lighter than air, tends to collect in high areas. LP gas is heavier than air and tends to settle in low areas.

1.7ENGINE PROTECTIVE DEVICES

The engine has several safety switches which cause the engine to automatically shut down under the fol- lowing conditions: low oil pressure, high coolant tem- perature, engine overspeed, low coolant level or over- crank (Figure 1.3).

Figure 1.3 - Engine Protective Devices

1.7.1 LOW OIL PRESSURE SWITCH

This switch is normally-closed (N.C.), but is held open by engine oil pressure during engine running. Should operating oil pressure drop below about 8-10 psi (55-68 kPa), the switch contacts close and the engine shuts down automatically (Figure 1.4).

Figure 1.4 - Low Oil Pressure Switch

1.7.2 HIGH COOLANT TEMPERATURE SWITCH

This normally open (N.O.), thermostatic switch has sensing tip which is immersed in captive coolant. Should coolant temperature exceed about 230°F (110°C), the switch contacts close, which causes the engine to shut down automatically (Figure 1.5).

Figure 1.5- High Coolant Temperature Switch

1.7.3 LOW COOLANT LEVEL SWITCH

Should engine coolant level drop below the level of the high coolant temperature switch, it is possible for the engine to overheat without automatic shutdown. To prevent such overheating without automatic shut down, the engine has a low coolant level sensor. If the engine coolant drops too low, the engine automatical- ly shuts down (Figure 1.6 on page 6).

Generac® Power Systems, Inc. 5

004721-0, 004722-0, 004723-0, 004724-0, 004725-0, 004725-1, 004725-2, 004725-3, 004726-0 specifications

Generac Power Systems is a leader in energy solutions, committed to providing reliable power products for homes, businesses, and industrial applications. Among their extensive range of products, the Generac Power Systems models 004721-0, 004722-0, 004723-0, 004724-0, 004725-0, 004725-1, 004725-2, 004725-3, and 004726-0 stand out due to their advanced features and innovative technologies.

One of the key features of these models is the robust engine performance. They are designed with Generac's signature engines, which ensure optimal power output and durability. This leads to better energy efficiency while maintaining a low operating cost. The models are engineered for seamless operation under various load conditions, ensuring that you stay powered in any situation.

These Generac models also incorporate state-of-the-art transfer switch technology, which enhances their reliability. The transfer switches ensure that power is instantly transferred from the grid to the generator during an outage, allowing for uninterrupted service. This is especially critical for homes and businesses where power reliability is essential.

Combining convenience with efficiency, the models feature user-friendly interfaces that simplify operation. With available mobile monitoring options, users can keep track of their power status and diagnostics remotely. This is a game changer for individuals who want to maintain oversight of their energy solutions without being physically present.

Safety is another critical aspect integrated into the Generac Power Systems. The models are equipped with advanced safety features such as overload protection, low oil shutdown, and high-temperature shutdown, ensuring an added layer of security for users.

Moreover, these models are built with rugged construction materials making them suitable for all environmental conditions. Whether it’s extreme cold or heat, they are crafted to withstand the elements while performing at peak efficiency.

Generac Power Systems emphasizes sustainability as well, with models designed for lower emissions and quieter operation. This is ideal for homeowners and businesses conscious of their environmental impact and seeking to reduce noise pollution.

Overall, the Generac Power Systems models 004721-0, 004722-0, 004723-0, 004724-0, 004725-0, 004725-1, 004725-2, 004725-3, and 004726-0 represent the evolution of power generation technology. With their robust features, efficient operation, and commitment to safety, these generators are an excellent investment for anyone seeking reliable power solutions.