Generac Power Systems Emergency Circuit Isolation Method, Total Circuit Isolation Method

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Section 2 — Installation

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

2.5EMERGENCY CIRCUIT ISOLATION

METHOD

This prevents overloading the generator by keeping electrical loads below the wattage/amperage capacity of the generator. If the generator is powering only crit- ical loads, within the wattage/amperage capacity, dur- ing utility power outages, consider using the emer- gency circuit isolation method.

Critical electrical loads are grouped together and wired into a separate “Emergency Distribution Panel.” Load circuits powered by that panel are with- in the wattage/amperage capacity of the generator set. When this method is used, it is difficult to overload the generator. The transfer switch must meet the fol- lowing requirements:

•It must have an ampere rating equal to, or greater than, the total amperage rating of the emergency distribution panel circuit.

•Have it installed between the building’s main dis- tribution panel and the emergency distribution panel.

2.6TOTAL CIRCUIT ISOLATION

METHOD

When a generator capable of powering all electrical loads in the circuit is to be installed, use the “Total Circuit Isolation Method.” It is possible for the gener- ator to be overloaded when this isolation method is employed. The following apply to the transfer switch in this type of system.

•Ampere rating of the transfer switch must be equal to, or greater than, the ampere rating of the normal incoming utility service.

•The transfer switch is installed between the utility service entrance and the building distribution panel.

2.7GROUNDING THE GENERATOR

The National Electrical Code requires the frame and external electrically conductive parts of this equip- ment to be properly connected to an approved earth ground and/or grounding rods. For that purpose, a GROUND LUG (Figure 2.2) is provided on the gener- ator mounting base. Consult a qualified electrician for grounding requirements in the area. Grounding procedures must meet local regulations.

DANGER

Do not connect the ground wire to any pipe that carries a flammable or explosive substance

– FIRE or an EXPLOSION may result.

Proper grounding helps protect personnel against electrical shock in the event of a ground fault condi- tion in the generator or in connected electrical devices. In addition, grounding helps dissipate static electricity that often builds up in ungrounded devices.

Figure 2.2 – Generator Grounding Lug (typical)

2.8GENERATOR AC NEUTRAL

CONNECTIONS

Generac Power Systems uses an UNGROUNDED AC neutral. Grounding is recommended only at the main service entrance. If the neutral wire is grounded and one of the phase loads becomes grounded, the exces- sive current opens the load circuit breaker or col- lapses the generator field. The actual result depends on the electrical characteristics of the particular installed generator.

2.9TRANSFER SWITCH START SIGNAL

CONNECTIONS

If the generator is to be installed with an automatic transfer switch, such as an engineered Generac GTS- type switch, it is necessary to connect the two-wire start control system.

Connect the two-wire start signal from the automatic transfer switch to the automatic start connection, which is located in the right hand corner inside the control panel. Match wires 178 and 183 in the trans- fer switch to 178 and 183 on the terminal strip in the control panel. The conductors for the two-wire start circuit must be in their own conduit.

10 Generac® Power Systems, Inc.

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Contents Liquid-cooled, Prepackaged Standby Generators Authorized Service Dealer Location ‹ Operation and Maintenance‹ HOW to Obtain Service IntroductionIntroduction IFC Safety Rules General Hazards Electrical Hazards Transfer Switch GeneratorAutomatic System Operation Generator AC Connection Systems‹ 1.7.1 LOW OIL Pressure Switch ‹ 1.7.2 High Coolant Temperature Switch‹ 1.7.3 LOW Coolant Level Switch Engine Protective DevicesUnpacking Lifting the GeneratorSpecifications Reconfiguring the Fuel System‹ 1.10.1 Generator Specifications ‹ 1.10.2 Engine SpecificationsTorque Specifications Engine OIL RecommendationsCoolant Recommendations Generator Location Generator Mounting SupportBasic Standby Electric System ‹ 2.1.1 Nfpa StandardsTransfer Switch Start Signal Connections Emergency Circuit Isolation MethodTotal Circuit Isolation Method Grounding the GeneratorBattery Installation Preparation Before START-UP‹ 2.10.1 Vented Batteries ‹ 2.11.1 Prior to Initial START-UPUsing a Standard GTS Transfer Switch Control Console Components Manual Transfer START-UP Automatic OperationWeekly Exercise Cycle Engine Heater Every Three MonthsOnce Every SIX Months Once AnnuallyCooling System Checking Fluid LevelsOverload Protection for Engine DC Electrical System ‹ 4.5.2 Check Battery ‹ 4.5.1 Check Engine OIL Level‹ 4.5.3 Exercise System ‹ 4.5.4 Inspect Cooling SystemMiscellaneous Maintenance ‹ 4.5.11 Changing the Engine AIR Cleaner‹ 4.6.1 Cleaning the Generator ‹ 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 Housing Governor Connector Connector Interface AssemblyCover Connector Housing ASM Motor StepperBase Mounting 1.5L Stnrd & Acstc Washer Shakeproof EXT 5/16 STLDampener Vibration Washer Flat 5/16 ZincWeld Stud Under Roof Panel for Access Cover Cable Assembly BASE-DOOR Ground Wire GRD Wire Assy 99HSBAssembly Cover Access Cover Access GENWeld Stud Under Roof For Access Cover Cable Roof Acstc & Stnd Cmprtmnt 1.5L Door Weldment 1.5 EPSWasher Self Locking Dome Baffle Cntrl PNL 1.5L AcousticTo a Wire Assembly SilkscHourmeter Holder FuseWaterpump Hardware Switch OIL Pressure ARM Adjust AlternatorGround Wire Starter Clamp for Wiring Harness not Shown16 7 Tank Coolant Recovery Radiator 1.5LVenturi 1.5L Modine Guard FAN 1.5L ModineVapor Cover AIR Cleaner Gasket AIR Cleaner AdapterWeldment Mounting Base Flange Fuel Inlet16 30 21 Housing Blower Assy Rotor 10KWAssy Rotor 15KW Assy Rotor 20KWASSY,WIRE#16 RED BOOT, Battery CableBRACKET, Battery Hold Down Battery Post Cover RED+Manifold Exhaust 1.5L Nipple TOE 1.5NPTX5.5 BLK IronSaddle 2 Inch 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

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