Guardian Technologies 004992-2 owner manual Generator Fuel System, Engine Protective Devices

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Section 1 - General Information

40kW Liquid-cooled Generators

1.6 GENERATOR FUEL SYSTEM

NOTE:

The unit has been factory tested and adjusted using a natural gas fuel system. If propane (LP) gas is neces- sary, refer to Section 1.12 for conversion.

Fuel pressure for a natural gas set up should be five inches to 14 inches of water column (0.18 to 0.5 psi) at all load ranges.

Fuel pressure for an LP vapor set up should be 11 inches to 14 inches of water column (0.4 to 0.5 psi) at all load ranges.

NOTE:

A seperate gas line and regulator may be needed to assure proper gas pressure to the generator. Improper gas pressure can cause hard starting and affect engine durability.

Gaseous fuels such as natural and LP (propane)

!gas are highly explosive. Even the slightest spark can ignite such fuels and cause an explo- sion. No leakage of fuel is permitted. Natural gas, which is lighter than air, tends to collect in high areas. LP gas is heavier than air and tends to settle in low areas.

1.7ENGINE PROTECTIVE DEVICES

The engine has several safety switches which cause the engine to automatically shut down under the fol- lowing conditions: low oil pressure, high coolant tem- perature, engine overspeed, low coolant level or over- crank (Figure 1.3).

Figure 1.3 - Engine Protective Devices

Low Oil Pressure Switch

High Coolant

Temperature Switch

Low Coolant

Level Sensor

‹1.7.1 LOW OIL PRESSURE SWITCH

This switch is normally-closed (N.C.) but is held open by engine oil pressure during engine running. Should operating oil pressure drop below about 8-10 psi (55-68 kPa), the switch contacts close, the engine shuts down automatically, and the low oil pressure LED is turned ON (Figure 1.4).

The Low Oil Pressure, High Coolant Temperature and Low Coolant Level are not monitored for the first 10 seconds of engine run time.

Figure 1.4 - Low Oil Pressure Switch

‹1.7.2 HIGH COOLANT TEMPERATURE SWITCH

Normally open (N.O.) thermostatic switch has sens- ing tip which is immersed in captive coolant. Should coolant temperature exceed about 230°F (110°C), the switch contacts close. This causes the engine to shut down automatically and turns on the high coolant temperature/low coolant level LED (Figure 1.5).

Figure 1.5- High Coolant Temperature Switch

‹1.7.3 LOW COOLANT LEVEL SWITCH

Should engine coolant level drop below the level of the high coolant temperature switch, it is possible for the engine to overheat without automatic shutdown. To prevent such overheating without automatic shut down, the engine has a low coolant level sensor. If the engine coolant drops too low, the engine automatical- ly shuts down and turns on the high coolant temper- ature/low coolant level LED (Figure 1.6 on page 6).

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Contents Liquid-cooled, Prepackaged Standby Generators ‹ Read this Manual Thoroughly ‹ Operation and Maintenance‹ HOW to Obtain Service IntroductionTable of Contents General Hazards Electrical Hazards Generator AC Connection Systems Transfer SwitchGenerator Automatic System OperationGenerator Fuel System ‹ 1.7.1 LOW OIL Pressure Switch‹ 1.7.2 High Coolant Temperature Switch ‹ 1.7.3 LOW Coolant Level SwitchLifting the Generator Unpacking‹ 1.10.2 Engine Specifications SpecificationsReconfiguring the Fuel System ‹ 1.10.1 Generator SpecificationsCoolant Recommendations Torque SpecificationsBefore Installation Engine OIL Recommendations‹ 2.1.1 Nfpa Standards Generator LocationGenerator Mounting Support Basic Standby Electric SystemTotal Circuit Isolation Method Emergency Circuit Isolation MethodGenerator AC Neutral Connections ‹ 2.9.2 GTS-TYPE ATS Transfer Switch Signal ConnectionsBattery Installation ‹ 2.9.1 PRE-PACKAGED ATSPreparation Before START-UP Control Console Components Using AN Engineered GTS Transfer Switch‹ 3.2.1 AUTO/OFF/MANUAL Switch ‹ 3.2.2 Fault Indicator Leds‹ 3.2.6 System Ready LED Engine Governor Adjustments‹ 3.2.5 SET Exercise Time Switch Manual Transfer START-UPAutomatic Operation Retransfer and ShutdownWeekly Exercise Cycle Checking Fluid Levels Overload Protection for Engine DC Electrical SystemCooling System ‹ 4.5.1 Check Engine OIL Level ‹ 4.5.2 Check Battery‹ 4.5.8 Check FAN Belt ‹ 4.5.9 Inspect Engine Governor‹ 4.5.13 Coolant Change Miscellaneous Maintenance‹ 4.5.11 Changing the Engine AIR Cleaner ‹ 4.6.1 Cleaning the Generator‹ 4.6.4 Battery Replacement ‹ 4.6.3 Battery MaintenanceService Maintenance Interval Information Scheduled MaintenanceLevel Maintenance Level Problem Cause Correction Troubleshooting PointsElectrical Data Electrical Data Electrical Data Electrical Data Engine Block Battery Post Covwer Black Assy WireHold Down Battery Boot Battery CableSee Latch Detail Duct Discharge LH Front Assy Wire 14AWG 7.5 #0 GRN/YELIntake Duct HSB Duct Discharge RH FrontPage Cover Front Panel HSB Assy 2A 12V UL BatteryControl BOX HSB Decal AVR CoverEngine Sunk Cover Flywheel AccessAssembly Resistor Flexplate 3.9L HSBTo a 17 Radiator Support L/H Side Tank Coolant RecoveryRadiator Copper Brass VENTURI,3.9L Cryslr HSB 22FANTo Engine Flange Fuel Inlet Base AIR Cleaner PlateHold Down AIR Cleaner Plate AIR Cleaner TOPLocktight Rotor 39030AD1 HSB Tecum Rotor 390 15KW 1P Direct HSB 2.5L FordRotor 390 20KW 1P Direct HSB 2.5L Ford Rotor 390 25KW 1P Direct HSB 2.5L FordExhaust Blanket 800MM NUT TOP Lock FL M12-1.75Exhaust Flange 2 Pipe Washer Lock M12Installation Diagram 40kW Liquid-cooled Generators 40kW Liquid-cooled Generators Warranty Schedule