Generac Power Systems 009600-5, 009734-5 Primary Regulator, Some Important Considerations

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Section 6 – Installation

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

Figure 6.15 – Typical Propane Gas Fuel System

◆ 6.5.4 PRIMARY REGULATOR

◆6.5.2 SOME IMPORTANT CONSIDERATIONS

When installing an LP gas system, consider seriously the following items:

•All fittings, lines, hoses and clamps must be tight and free of leaks. Apply a pipe sealant to threads when assembling threaded connections. This reduces the possibility of leakage.

•Test the entire fuel system for leaks using approved test methods.

•Optimum gas pressure at the inlet to the gaseous fuel solenoid valve and secondary regulator is 11 inches water column.

•The installer’s fuel supply connection point is at the gaseous fuel solenoid valve. This is a 3/4-inch (female) connection. Provide a suitable 3/4-inch NPT (male) connector to attach to the fuel supply line.

•Use a length of approved flexible fuel hose between the gaseous fuel solenoid valve and rigid gas piping. The flexible line should be at least 6 inches longer than necessary.

◆6.5.3 VAPOR WITHDRAWAL

LP gas is stored in pressure tanks as a liquid. The gas systems used with these generators were designed only for vapor withdrawal type systems. Vapor withdrawal systems use the gas vapors that form above the liquid fuel in the tank. Do NOT attempt to use the generator with any liquid withdrawal type system.

Gas pressure delivered to the solenoid valve must be properly regulated by means of a primary gas regulator. Mount the primary regulator at the gas tank outlet or in the supply line from the gas tank. The following rules apply:

•For best results, the primary regulator supplies gaseous fuel to the secondary regulator at 11 inches water column. Do NOT exceed 14 inches water col- umn.

•The installer must be sure the primary regulator is rated at sufficient gas flow to operate the generator plus all other gas appliances in the circuit.

NOTE:

Recommended MINIMUM gas flow rate for all air- cooled PRIMEPACT series generators is 67 cubic feet per hour.

If an existing primary gas regulator does not have a sufficient flow capacity for the generator and other gas appliances in the circuit, (a) install a primary regulator with adequate flow rate, or (b) install a sep- arate regulator only and rated at least 67 cubic feet per hour. The inlet side of any primary regulator that supplies the generator must connect directly to a gas pressure tank. Do NOT tee the generator line into a gas circuit feeding other areas.

◆6.5.5 GASEOUS CARBURETION

LP gas vapors should be supplied to the secondary reg- ulator inlet at about 11 inches water column (positive pressure). The engine pistons draw air in during the intake stroke (Figure 6.16). This air passes through a carburetor venturi, which creates a low pressure that is proportional to the quantity of air being pumped. The low pressure from the carburetor venturi acts on the regulator diaphragm to pull the diaphragm toward the source of low pressure. A lever attached to the diaphragm opens a valve to permit gas glow through the carburetor.

Figure 6.16 – LP Gas Carburetion Diagram

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Contents Power SYSTEMS, INC Introduction Authorized Service Dealer LocationTable of Contents General Hazards Electrical Hazards Reference Number Identification Generator IdentificationGenerator AC Connection System InstallationSafety Generator ApplicabilityEngine OIL Requirements SpecificationsFuel Consumption gph/lbs.ph Fuel RequirementsGenerator Control Panel Automatic Choke Optional Remote START/STOP PanelBefore Starting the Engine Letting the Engine Stabilize Stopping the GeneratorStarting the Generator Engine Exhaust GASField Boost High Temperature SwitchLOW OIL Pressure Switch Protection Systems5 25-HOUR BREAK-IN Period Checking the Engine OIL LevelOvervoltage Protection 6 25-HOUR CHECK-UPCleaning the Foam Precleaner Maintaining the Engine AIR CleanerChanging the Engine OIL AND/OR OIL Filter Checking the Engine Spark Plug Clean AIR Intake ScreenSpark Arrestor Muffler Every SIX Months Cleaning the GeneratorBattery Maintenance WeeklyWattage Reference Guide OUT of Service ProcedureDrive Belt Exercising the GeneratorPrimepact 66G and 66LP Recreational Vehicle Generators Part General Hazards Electrical Hazards Generator Engine Operating Speed Purpose and Scope Installation InstructionsStandards Booklets Equipment DescriptionMajor Features and Dimensions Suspended Mounting Location and SupportGenerator Support Generator LocationCompartment Size Generator CompartmentsGenerator Restraint Compartment ConstructionAcoustics Sound Insulating MaterialsCompartment Floor Cutout Generator Airflow Cooling and Ventilating AIRCompartment Floor Cutouts Cooling AIR Inlet OpeningsGasoline Fuel System Testing the InstallationCompensating for Restrictions Generator Fuel Supply Line LP GAS Fuel SystemParts not Included in Fuel System Gaseous Carburetion Primary RegulatorSome Important Considerations Vapor WithdrawalLeakage Tests Exhaust SystemFuel Supply Lines Excess Flow ValveType of Exhaust System Exhaust System SafetyWiring Electrical ConnectionsBattery Installation 18 Transfer Switch Isolation Method Battery CablesRemote Panel Models Optional AccessoriesBattery Cable Connections Battery CompartmentInitial Start Post Installation TestsTesting Under Load Before Initial START-UPInstallation Checklist Problem Cause Correction Troubleshooting GuideGenerac Power Systems, Inc Electrical Data Exploded Views and Parts Lists QTY Description To Engine BASE, Mounting To Engine BASE, Mounting To Engine Ground Item Part NO. QTY. Description Exploded Views and Parts Lists QTY Description Exploded Views and Parts Lists Carburetor Assemby CARB. V-TWIN L/P Primepact 66G and 66LP Recreational Vehicle Generators Primepact 66G and 66LP Recreational Vehicle Generators Primepact 66G and 66LP Recreational Vehicle Generators MANUFACTURER’S Emission Control System Warranty Coverage Your Warranty Rights and ObligationsPURCHASER’S/OWNER’S Warranty Responsibilities Emission Related Parts Include the Following Emission Control System WarrantyGenerac Power SYSTEMS, INC
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