Section 1 - General Information

Guardian Liquid-cooled 27 kW and 30 kW Generators

1.6 GENERATOR FUEL SYSTEM

Figure 1.4 - Low Oil Pressure Switch

The unit has been factory tested and adjusted using a natural gas fuel system. If propane (LP) gas is neces- sary, contact an authorized service dealer.

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.

NOTE:

The Low Oil Pressure, High Coolant Temperature and Low Coolant Level are not monitored for the first 10 seconds of engine run time.

Gaseous fuels such as natural and LP (propane)

!gas are highly explosive. Even the slightest spark can ignite such fuels and cause an explo- sion. 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

‹1.7.2 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. This causes the engine to shut down automatically and turns on the high coolant temperature/low coolant level LED (Figure 1.5).

Figure 1.5- High Coolant Temperature Switch

LOW OIL PRESURE SWITCH

LOW COOLANT LEVEL SWITCH

HIGH

COOLANT

TEMPERATURE

SWITCH

‹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, the engine shuts down automatically, and the low oil pressure LED is turned ON (Figure 1.4).

‹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 and turns on the high coolant temper- ature/low coolant level LED (Figure 1.6 on page 6).

Generac® Power Systems, Inc. 5

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Generac Power Systems 004988-1 owner manual Engine Protective Devices, ‹ 1.7.2 High Coolant Temperature Switch
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004988-1 specifications

Generac Power Systems has established itself as a leader in the generator industry, and the Generac Power Systems 004988-1 model exemplifies the company’s commitment to innovation, reliability, and performance. This standby generator is designed to provide seamless power solutions for both residential and commercial applications, ensuring that users remain connected and comfortable even during power outages.

One of the standout features of the 004988-1 model is its automatic transfer switch (ATS), which allows for instant power restoration within seconds of an outage. The ATS continuously monitors the electrical supply and automatically engages the generator when it detects a power failure, eliminating any stress or inconvenience for the user. This feature is particularly beneficial for those who may be away from home during an outage or for businesses that cannot afford downtime.

The 004988-1 is equipped with a powerful engine capable of delivering up to 20 kilowatts of backup power, sufficient to support essential household appliances and systems, such as HVAC, refrigeration, and lighting. Its robust construction ensures durability and longevity, equipped to withstand the rigors of extended use in various environmental conditions.

Another significant characteristic of this model is its emission-friendly design. Generac has incorporated advanced technologies to meet and exceed EPA standards, resulting in a cleaner and more environmentally friendly operation. The generator runs on natural gas or liquid propane, providing users with flexible fuel options and reducing dependency on traditional fuel sources.

Moreover, the 004988-1 comes with smart technology features, including Wi-Fi connectivity. This allows users to monitor and control their generator remotely via a smartphone app. Users can receive real-time notifications, monitor power usage, and conduct maintenance checks, ensuring peak performance of their generator.

The quiet operation of the 004988-1 is also noteworthy, making it an attractive option for residential areas where noise levels can be a concern. Generac has integrated sound-dampening technology, ensuring that the generator operates with minimal noise, allowing users to enjoy peace of mind without disruption.

In summary, the Generac Power Systems 004988-1 is a robust, reliable, and technologically advanced generator that seamlessly integrates into any household or commercial setup. With its automatic transfer switch, high power output, environmentally friendly design, smart technology features, and quiet operation, it stands out as an excellent choice for individuals seeking a dependable power solution for any situation.
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