Generac 004373-3, 004626-2 Emissions Control System, Coolant, ‹ 1.12.1 AIR Fuel Ratio Controller

Page 9

Section 1 — General Information

Guardian Liquid-cooled 40 kW Generator

1.10 ENGINE OIL RECOMMENDATIONS

The unit has been filled with 15W-40 engine oil at the factory. Use a high-quality detergent oil classified “For Service CC, SD, SE or SF.” Detergent oils keep the engine cleaner and reduce carbon deposits. Use oil hav- ing the following SAE viscosity rating, based on the ambient temperature range anticipated before the next oil change:

 

Temperature

 

Oil Grade(Recommended)

 

 

 

 

 

Above 80º F (27º C)

 

SAE 30W or 15W-40

 

 

32º to 80º F (-1º C to 27º C)

 

SAE 20W-20 or 15W-40

 

 

Below 32º F (0º C)

 

SAE 10W or 15W-40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Any attempt to crank or start the engine before it ! has been properly serviced with the recommended

oil may result in an engine failure.

1.12 EMISSIONS CONTROL SYSTEM

(MODEL 004626-2)

This model is equipped with an active exhaust emis- sions control system to comply with certain California air district regulations for natural gas emergency gener- ating sets, including the South Coast Air Quality Management District. Do not tamper with or disable any part of this system, including the exhaust catalyst, carburetor, oxygen sensor, air-fuel ratio controller, sole- noid valve and gas regulator. These items are not sub- ject to periodic maintenance or adjustment.

This model is of a size (greater than 50 brakehorse- power) that may require a review by air permitting authorities prior to installation and operation. Consult the local air management district for details and spe- cific requirements.

1.11 COOLANT

Use a mixture of half low silicate, ethylene glycol base antifreeze and half soft water. Use only soft water and only low silicate antifreeze. If desired, add a high quali- ty rust inhibitor to the recommended coolant mixture. When adding coolant, always add the recommended 50- 50 mixture.

DANGER

Do not remove the radiator pressure cap while

!the engine is hot or serious burns from boiling liquid or steam could result.

Ethylene glycol base antifreeze is poisonous. Do

!not use mouth to siphon coolant from the radia- tor, recovery bottle or any container. Wash hands thoroughly after handling. Never store used antifreeze in an open container because animals are atracted to the smell and taste of antifreeze even though it is poisonous to them.

Do not use any chromate base rust inhibitor

!with ethylene glycol base antifreeze, or chromi- um hydroxide (“green slime”) will form and cause overheating. Engines that have been operated with a chromate base rust inhibitor must be chemically cleaned before adding ethyl- ene glycol base antifreeze. Using any high sili- cate antifreeze boosters or additives also will cause overheating. Generac also recommends that any soluble oil inhibitor NOT be used for this equipment.

Figure 1.4 - Emissions Control System

‹1.12.1 AIR FUEL RATIO CONTROLLER

The air fuel ratio controller is an advanced micro- processor designed to work with a three-way catalyst and a feedback (rich bias) carburetor to provide close- loop fuel management. Its digital adaptive control is able to compensate for variations in fuel mixtures and engine tunes. It is time based activated. (For example, it will activate after 45 seconds from receiving the power signal.) The part number for the air fuel ratio controller is 0D4221.

Principle of Operation: The oxygen sensor, installed on the exhaust pipe, between the engine and the cat- alytic muffler (closer to the engine), continuously moni- tors the exhaust gas composition. A feedback signal is sent from the oxygen sensor to the air fuel ratio con- troller, which controls the fuel system to maintain the optimal, stoichiometric air fuel ratio. The air fuel mix- ture to the engine is controlled by biasing the diaphragm in the fuel regulator using vacuum (from the carburetor). This vacuum signal is directed to the fuel regulator via the control valve. The air fuel ratio con- troller determines the amount of vacuum signal sent to the fuel regulator. The more vacuum sent to the regula- tor, the more restricted the fuel flow will be, therefore the leaner the air fuel mixture.

Generac® Power Systems, Inc. 7

Page 8 Page 10
Image 9
Page 8 Page 10
Contents Liquid-cooled, Prepackaged Standby Generators Authorized Dealer Location IntroductionIntroduction Inside Front Cover General Hazards Electrical Hazards UNPACKING/INSPECTION Prepackaged Transfer SwitchGenerator Generator AC Connection SystemsSpecifications Main Circuit BreakerEngine Protective Devices ‹ 1.9.1 Conversion to LP GAS Vapor Fuel Requirements RecommendationsEmissions Control System Coolant‹ 1.12.1 AIR Fuel Ratio Controller Basic Standby Electric System Standby Generator InstallationNfpa Standards Other Published Standards‹ 2.6.1 PRE-PACKAGED Type Switch Transfer Switch Start Signal ConnectionsMethod Grounding the GeneratorBattery Installation Preparation Before START-UP‹ 2.7.1 Vented Batteries ‹ 2.8.1 Prior to Initial START-UP ‹ 2.8.2 Transfer SwitchUsing the AUTO/OFF/MANUAL Switch Sequence of Automatic Operation Engine Heater‹ 3.2.3 Manual Position Checking the Engine OIL Level Weekly Exercise Cycle‹ 4.2.2 OIL and Filter Change Procedure Changing the Engine AIR CleanerChanging the Engine OIL and Filter ‹ 4.2.1 Engine OIL RecommendationsBattery Maintenance ‹ 4.5.1 Battery ReplacementSpark Plugs Cooling System Miscellaneous MaintenanceOverload Protection for DC FuseOUT of Service Procedure ‹ 4.11.1 Removal from Service‹ 4.11.2 Return to 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 Your Warranty Rights and Obligations MANUFACTURER’S Emission Control System Warranty CoveragePURCHASER’S/OWNER’S Warranty Responsibilities 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.
Top Page Image Contents