Generac 004373-3, 004626-2 Method, Grounding the Generator, Generator AC Neutral Connections

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Section 2 — Installation

Guardian Liquid-cooled 40 kW Generator

Figure 2.1 – Basic Standby Electric System

DANGER

 

2.2EMERGENCY CIRCUIT ISOLATION

METHOD

This prevents overloading the generator by keeping elec- trical loads below the wattage/amperage capacity of the generator. If the generator is powering only critical loads, within its wattage/amperage capacity, during util- ity power outages, consider using the emergency circuit isolation method.

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

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

•It must be installed between the building’s main distri- bution panel and the emergency distribution panel.

2.3TOTAL 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 genera- tor 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 must be installed between the utility service entrance and the building distribution panel.

2.4GROUNDING THE GENERATOR

The National Electrical Code requires the frame and external electrically conductive parts of this equipment 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 generator mounting base. Consult a qualified electrician for grounding requirements in your area. Grounding procedures must meet local regulations.

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 electri- cal shock in the event of a ground fault condition 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)

2.5GENERATOR AC NEUTRAL

CONNECTIONS

Generac uses an UNGROUNDED AC neutral. Grounding is recommended only at the main service entrance.

2.6TRANSFER SWITCH START SIGNAL CONNECTIONS

‹2.6.1 PRE-PACKAGED TYPE SWITCH

Connect the six signal wires from the automatic trans- fer switch to the engine generator control, which is located on the upper right side and inside the lower control panel. Match wires 23, 194, N1, N2, T1 and T2 in the transfer switch to the corresponding wires on the terminal strip in the lower panel. The conductors for these wires should be in a seperate conduit from the main AC output wires. If the control wires are run in the same conduit, the control wires must be a shielded cable.

‹2.6.2 “GTS” Type Engineered Switch

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 lower panel. Match wires 178 and 183 in the transfer 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. If the control wires are run in the same conduit, the control wires must be a shielded cable.

Generac® Power Systems, Inc. 9

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Contents Liquid-cooled, Prepackaged Standby Generators Authorized Dealer Location IntroductionIntroduction Inside Front Cover General Hazards Electrical Hazards Generator AC Connection Systems Prepackaged Transfer SwitchUNPACKING/INSPECTION GeneratorEngine Protective Devices SpecificationsMain Circuit Breaker ‹ 1.9.1 Conversion to LP GAS Vapor Fuel Requirements Recommendations‹ 1.12.1 AIR Fuel Ratio Controller Emissions Control SystemCoolant Other Published Standards Standby Generator InstallationBasic Standby Electric System Nfpa StandardsGrounding the Generator Transfer Switch Start Signal Connections‹ 2.6.1 PRE-PACKAGED Type Switch Method‹ 2.7.1 Vented Batteries Battery InstallationPreparation Before START-UP ‹ 2.8.1 Prior to Initial START-UP ‹ 2.8.2 Transfer SwitchUsing the AUTO/OFF/MANUAL Switch ‹ 3.2.3 Manual Position Sequence of Automatic OperationEngine Heater Checking the Engine OIL Level Weekly Exercise Cycle‹ 4.2.1 Engine OIL Recommendations Changing the Engine AIR Cleaner‹ 4.2.2 OIL and Filter Change Procedure Changing the Engine OIL and FilterSpark Plugs Battery Maintenance‹ 4.5.1 Battery Replacement DC Fuse Miscellaneous MaintenanceCooling System Overload Protection for‹ 4.11.2 Return to Service OUT of Service Procedure‹ 4.11.1 Removal from Service SYSTEM/COMPONENT Procedure Frequency Service ScheduleProblem Cause Correction Troubleshooting GuideElectrical Data Not Used on Guardian Unit Electrical Data TS1 Generator D4992-A Model No Section 40 kW 0D6974 KW Generators No D6975 27 *28 Drain Pan To Oil On Oil QTY Description Base Frame Assembly M6 Hinge Panel Face Panel BTM & Back Control VDC Panel Face Cover Plate AVR ALT Leads Sensing Wire QTY Flywheel Engine Stator Leads Detail Scroll Washer Lock M12 Exploded Views and Parts Lists Engine 4.3L GM Exploded Views and Parts Lists MOUNT, Engine R & L To Thermostat Housing To Engine Block To Starter Solenoid RED Black To Engine Block Part KIT Radiator Copper Brass DIA. Clamp ASSEMBLY2 Compartment NUT Wing 1/4-20 Nylk To Stepper Motor Support Solenoid NAT GAS Attach to REGULATOR, N/G R600S Exploded Views and Parts Lists Muffler Catalyst 4.3L Assembly Motor Stepper Guardian Liquid-cooled 40 kW Generators PURCHASER’S/OWNER’S Warranty Responsibilities Your Warranty Rights and ObligationsMANUFACTURER’S Emission Control System Warranty Coverage Emission Related Parts Include the Following Emission Control System WarrantyThis Warranty Shall not Apply to the Following Warranty Schedule

004373-3, 004626-2, 004373-3 , 004626-2 specifications

Generac is a leader in the power generation industry, known for its reliable and innovative products. Among its extensive range of offerings, two models stand out: the Generac 004373-3 and the 004626-2. These models represent the cutting edge of home standby generators.

The Generac 004373-3 is designed to provide seamless power during outages, ensuring that homes remain comfortable and functional. One of its main features is the automatic transfer switch, which detects a power outage and activates the generator within seconds. This automatic response eliminates the need for manual intervention, allowing homeowners to go about their lives without interruption.

This model is equipped with a durable engine that runs on liquid propane or natural gas, providing flexibility depending on the availability of fuel sources. The 004373-3 has an impressive power output, capable of powering essential household appliances, including refrigerators, heating systems, and lights. Its compact design allows for easy installation, making it suitable for a variety of home sizes.

On the other hand, the Generac 004626-2 also focuses on providing reliable power but with additional advanced features. One of its key characteristics is the True Power Technology, which delivers clean and stable power, making it ideal for sensitive electronics and appliances. This feature is crucial for households that rely on digital devices, protecting them from fluctuations that could potentially cause damage.

Additionally, the 004626-2 comes with a user-friendly control panel that allows for easy monitoring and adjustments. The model also incorporates Smart Management Technology, which enables users to manage their power consumption effectively. This technology allows homeowners to prioritize the most critical circuits, ensuring essential services remain operational during outages.

Both models emphasize ease of maintenance, with a design that facilitates access to components for servicing. Generac generators are known for meeting high standards of quality, ensuring reliability and longevity. With their advanced technologies and robust features, the Generac 004373-3 and 004626-2 provide peace of mind, allowing homeowners to remain connected and powered, no matter the circumstances. Whether for unexpected outages or planned maintenance, Generac continues to set the standard in home power solutions.
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