Generac Power Systems owner manual Automatic System Operation, Generator AC Connection Systems

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Section 1 - General Information

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

1.1GENERATOR

This equipment is a liquid-cooled, engine-driven gen- erator set. The generator is designed to supply elec- trical power that operates critical electrical loads during utility power failure. The unit has been facto- ry-installed in a weather resistant, all metal enclosure and is intended for outdoor installation only. Use this generator as a source of electrical power for the oper- ation of 120 and/or 240 volts, single phase loads.

These models are available. They are rated as follows:

Models 0047210 and 0047220: Provides 15,000 watts (15 kW) of single phase power.

Models 0047230 and 0047240: Provides 20,000 watts (20 kW) of single phase power.

Models 0047250, 0047251, 0047252, 0047253, and 0047260: Provides 25,000 watts (25 kW) of sin- gle phase power.

If this generator is used to power electrical

!load circuits normally powered by a utility power source, it is required by code to install a transfer switch. The transfer switch must effectively isolate the electric system from the utility distribution system when the generator is operating (NEC 701). Failure to isolate an electrical system by such means results in damage to the generator and may also result in injury or even death to utility power work- ers due to backfeed of electrical energy.

1.3AUTOMATIC SYSTEM OPERATION

When this generator, along with its transfer switch, has been installed and interconnected, a circuit board in the generator panel constantly monitors utility power source voltage. Should that voltage drop below a pre- set value, and remain at such a low state for a preset amount of time, the generator cranks and starts. After the generator starts, the transfer switch transfers load circuits so the generator can power them.

When utility source voltage has been restored, the switch re-transfers back to the utility source voltage and the generator then shuts down.

Please reference the transfer switch manual for spe- cific information.

1.4GENERATOR AC CONNECTION

SYSTEMS

The generator was shipped from the factory with its stator AC output leads connected in a single-phase, three-wire generator AC connection system (Figure 1.1). The stator assembly in this system consists of a pair of stationary windings, with two leads brought out of each winding. Each single winding can supply 120 volts AC, 60 Hertz. When the two windings are connected in series, a 240 volts, 60 Hertz AC output results. Typically the two “hot” leads in the circuit are Wires No. 11 and 44. The “Neutral” leads are the junction of Wires 22 and 33.

Figure 1.1 - Generator AC Connection System

1.2TRANSFER SWITCH

This generator system may include a matched auto- matic transfer switch which is intended to be used in conjunction with the Guardian generator. It is sup- plied in either a NEMA 1 enclosure (15 kW model 004721, 20 kW models 004723) or a NEMA 3R enclosure (25 kW models 004725). The NEMA 1 enclosure is intended for indoor use only. The NEMA 3R enclosure is weather proof and can be used indoors or outdoors. Follow these rules:

•Install the transfer switch on a firm, sturdy sup- porting structure.

•To prevent switch distortion, level the switch if nec- essary. This can be done by placing washers between the switch enclosure and the mounting surface.

•Never install the switch where water or any corro- sive substance might drip onto the enclosure.

•Protect the switch at all times against excessive moisture, dust, dirt, lint, construction grit and cor- rosive vapors.

•Failure to utilize a Generac/Guardian transfer switch with this generator will void the warranty.

1.5MAIN CIRCUIT BREAKER

The generator’s main circuit breaker is included with the unit as shipped from the factory. The breaker for each unit is described in Figure 1.2 at the top of page 5.

1.6GENERATOR FUEL SYSTEM

The generator has been factory tested and adjusted using a natural gas fuel system. If propane (LP requirements) gas is preferred, contact an authorized service dealer. Refer to Secion 1.12.

4 Generac® Power Systems, Inc.

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Contents Liquid-cooled, Prepackaged Standby Generators ‹ HOW to Obtain Service Authorized Service Dealer Location‹ Operation and Maintenance IntroductionIntroduction IFC Safety Rules General Hazards Electrical Hazards Automatic System Operation Transfer SwitchGenerator Generator AC Connection Systems‹ 1.7.3 LOW Coolant Level Switch ‹ 1.7.1 LOW OIL Pressure Switch‹ 1.7.2 High Coolant Temperature Switch Engine Protective DevicesUnpacking Lifting the Generator‹ 1.10.1 Generator Specifications SpecificationsReconfiguring the Fuel System ‹ 1.10.2 Engine SpecificationsTorque Specifications Engine OIL RecommendationsCoolant Recommendations Basic Standby Electric System Generator LocationGenerator Mounting Support ‹ 2.1.1 Nfpa StandardsTotal Circuit Isolation Method Transfer Switch Start Signal ConnectionsEmergency Circuit Isolation Method Grounding the Generator‹ 2.10.1 Vented Batteries Battery InstallationPreparation Before START-UP ‹ 2.11.1 Prior to Initial START-UPUsing a Standard GTS Transfer Switch Control Console Components Manual Transfer START-UP Automatic OperationWeekly Exercise Cycle Once Every SIX Months Engine HeaterEvery Three Months Once AnnuallyCooling System Checking Fluid LevelsOverload Protection for Engine DC Electrical System ‹ 4.5.3 Exercise System ‹ 4.5.2 Check Battery‹ 4.5.1 Check Engine OIL Level ‹ 4.5.4 Inspect Cooling System‹ 4.6.1 Cleaning the Generator Miscellaneous Maintenance‹ 4.5.11 Changing the Engine AIR Cleaner ‹ 4.5.13 Coolant Change‹ 4.6.3 Battery Maintenance ‹ 4.6.4 Battery ReplacementScheduled Maintenance Service Maintenance Interval InformationLevel Maintenance Level Troubleshooting Points Problem Cause CorrectionGuardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators Installation Diagram Section Electrical Data Customer Connection 120/240V 1-PHASE Electrical Data Cover Connector Housing Housing Governor ConnectorConnector Interface Assembly ASM Motor StepperDampener Vibration Base Mounting 1.5L Stnrd & AcstcWasher Shakeproof EXT 5/16 STL Washer Flat 5/16 ZincWeld Stud Under Roof Panel for Access Cover Cable Assembly Cover Access Assembly BASE-DOOR Ground WireGRD Wire Assy 99HSB Cover Access GENWeld Stud Under Roof For Access Cover Cable Washer Self Locking Dome Roof Acstc & Stnd Cmprtmnt 1.5LDoor Weldment 1.5 EPS Baffle Cntrl PNL 1.5L AcousticTo a Hourmeter Wire AssemblySilksc Holder FuseWaterpump Hardware Ground Wire Starter Switch OIL PressureARM Adjust Alternator Clamp for Wiring Harness not Shown16 7 Venturi 1.5L Modine Tank Coolant RecoveryRadiator 1.5L Guard FAN 1.5L ModineVapor Weldment Mounting Base Cover AIR CleanerGasket AIR Cleaner Adapter Flange Fuel Inlet16 30 21 Assy Rotor 15KW Housing BlowerAssy Rotor 10KW Assy Rotor 20KWBRACKET, Battery Hold Down ASSY,WIRE#16 REDBOOT, Battery Cable Battery Post Cover RED+Saddle 2 Inch Manifold Exhaust 1.5LNipple TOE 1.5NPTX5.5 BLK Iron PIPE,EXHAUST 1.5L STNDRD&ACSTCYour Warranty Rights and Obligations MANUFACTURER’S Emission Control System Warranty CoveragePURCHASER’S/OWNER’S Warranty Responsibilities Emission Control System Warranty Emission Related Parts Include the FollowingWarranty Schedule

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.
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