Generac Power Systems 004373-6 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 method prevents overloading the generator by keeping electrical loads below the wattage/amperage capacity of the generator. If the generator is powering only critical loads, within its wattage/amperage capacity, during 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 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 disconnect circuit breaker 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 the 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 separate conduit from the main AC output wires.

‹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.

NOTE:

When using a GTS switch, it is necessary to connect a 240V AC supply to N1 and N2 terminals of the generator to provide for battery charging. Wires T1, T2, 23 and 194 should not be connected.

Generac® Power Systems, Inc. 9

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Contents Liquid-cooled, Prepackaged Standby Generators Models Authorized Dealer Location IntroductionInstallation Diagram 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‹ 1.8.2 Generator and Load Compatibility ‹ 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 Using 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 FilterCooling System Battery Maintenance‹ 4.5.1 Battery Replacement Spark PlugsEngine Coolant Miscellaneous MaintenanceOverload Protection for DC Fuse‹ 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 GuideInstallation Diagram TS1 Generator D4992-A Guardian Liquid- Panel 4.3L Drawing No Section Wiring Diagram Control Panel Model No Drawing No KW Generators No D6975 EC1 ACT 12 19 11 3529 QTY Description ONE Assembly M6 Hinge Panel Face Panel BTM & Back Control Exploded Views and Parts Lists CHASSIS, Universal Exploded Views and Parts Lists QTY To Engine Flywheel Washer Lock M12 Exploded Views and Parts Lists Engine 4.3L GM Exploded Views and Parts Lists Mount Engine R & L KIT Radiator Copper Brass DIA. Clamp Assembly 2 Compartment To Engine Front NUT Wing 1/4-20 Nylk To Stepper Motor To Valve Cover To Intake Manifold Support Solenoid NAT GAS Attach to FAN Scroll Elbow 90D 3/4NPT Exploded Views and Parts Lists Muffler Catalyst 4.3L Assembly Motor Stepper To Thermostat Housing Guardian Liquid-cooled 40 kW Generators 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 WarrantyWarranty Schedule

004373-6, 004626-5 specifications

Generac Power Systems has established itself as a leader in the field of backup and portable power solutions, and their models 004626-5 and 004373-6 are prime examples of their dedication to innovation and reliability. These models are designed to cater to a variety of power needs, making them essential assets for homeowners and businesses alike.

The 004626-5 is a robust home standby generator, renowned for its powerful performance and automatic transfer switch capabilities. This model features Generac's G-Force engine, which is specifically engineered for high performance and longevity, ensuring that it can handle the demands of powering a home during outages. It boasts a multi-language LCD display that provides real-time system status updates, allowing users to monitor performance with ease. Additionally, the 004626-5 is equipped with an integrated wi-fi system, enabling remote monitoring through the Mobile Link app. This feature gives users the convenience of checking their generator's status from anywhere, ensuring peace of mind.

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