Generac Power Systems owner manual Using a Standard GTS Transfer Switch

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Section 3 — Operation

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

Before starting the generator for the first time, the installer must complete the following procedures. For follow-up maintenance information and/or service intervals, please refer to Section 4, “Maintenance.”

‹2.11.2 TRANSFER SWITCH

If this generator is used to supply power to any elec- trical system normally powered by an electric utility, the National Electrical Code requires that a transfer switch be installed. The transfer switch prevents elec- trical backfeed between two different electrical sys- tems. (For additional information, see the applicable transfer switch manual for this unit.) The transfer switch, as well as the generator and other standby components, must be properly located and mounted in strict compliance with applicable codes, standards and regulations.

‹2.11.3 FUEL SYSTEM

Make sure the fuel supply system to the generator (a) delivers the correct fuel at the correct pressure and

(b)is properly purged and leak tested according to code. No fuel leakage is permitted. See “Specifications” (Section 1.10) for more information.

‹2.11.4 GENERATOR SET LUBRICATION

Check the engine crankcase oil level before operating and add oil to the proper level – the dipstick “FULL” mark. Never operate the engine with the oil level below the dipstick “ADD” mark. See “Specifications” (Section 1.10) and “Engine Oil Recommendations” (Section 1.14).

‹2.11.7 ELECTRICAL SYSTEM

Make sure the generator is properly connected to an approved earth ground and/or ground rod.

Make sure the generator battery is fully charged, properly installed and interconnected, and ready for use.

Check to ensure that there are no loose electrical con- nections. Restrain any loose wires to keep them clear of any moving generator set components.

3.1USING A STANDARD “GTS”

TRANSFER SWITCH

When required, the pre-packaged standby generator can be installed with a Generac “GTS” type engi- neered automatic transfer switch.

When a GTS type transfer switch is used, it controls automatic operation and automatic transfer as fol- lows:

•Solid state circuits in the transfer switch monitor utility power source voltage.

•When utility source voltage drops below a pre-set level, transfer switch action closes the circuit. The engine then cranks and starts as controlled by the pre-packaged generator’s Control Module circuit board.

•After the engine starts and when the generator AC output voltage and frequency have reached a pre-set value, transfer switch circuits signal the transfer switch main contacts to actuate to the “Standby” power source side. Generator AC output then powers load circuits.

NOTE:

This engine is shipped from the manufacturer with 15W-40 oil. This oil should be changed after 30 hours of operation.

‹ 2.11.5 ENGINE COOLANT

•When the utility power source voltage is restored above a pre-set level, transfer switch solid state circuits signal the switch main contacts to move back to their utility power source side.

•Following re-transfer back to the utility power source side, transfer switch circuit board action opens the circuit. Engine then shuts down.

Have the engine cooling system properly filled with the recommended coolant mixture. Check the system for leaks and other problems. See “Specifications” (Section 1.10) and “Coolant” (Section 1.15).

‹2.11.6 BELT TENSION

Check the engine fan belt tension and condition prior to placing the unit into service and at recommended intervals. Belt tension is correct when a force of approximately 22 pounds (10 kg), applied midway between pulleys, deflects the belt about 3/8- to 5/8- inch (10 to 16 mm).

NOTE:

If the generator is installed in conjunction with a GTS type transfer switch, refer to the applicable transfer switch manual for exact operating param- eters and timing sequences.

12 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 SpecificationsCoolant Recommendations Torque SpecificationsEngine OIL 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 Weekly Exercise Cycle Control Console ComponentsManual Transfer START-UP Automatic Operation Once Every SIX Months Engine HeaterEvery Three Months Once AnnuallyOverload Protection for Engine DC Electrical System Cooling SystemChecking Fluid Levels ‹ 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&ACSTCPURCHASER’S/OWNER’S Warranty Responsibilities Your Warranty Rights and ObligationsMANUFACTURER’S Emission Control System Warranty Coverage 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.

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