Generac Power Systems 004988-1 Specifications, Fuel Consumption, Reconfiguring the Fuel System

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Section 1 — General Information

Guardian Liquid-cooled 27 kW and 30 kW Generators

1.10 SPECIFICATIONS

‹1.10.1 GENERATOR SPECIFICATIONS

 

 

Single-phase

 

 

Model

4988-1

 

 

Rated Max. Cont.

27 (NG), 30 (LP)

 

 

AC Power Output (kW)

 

 

 

Rated voltage (volts)

120/240

 

 

No. of Rotor Poles

4

 

 

Driven Speed of Rotor

1800

 

 

Rotor Excitation System

Direct excited brush type

 

 

Type of Stator

4 Wire

 

 

Rotor/Stator Insulation

Class F/H

 

‹1.10.2 ENGINE SPECIFICATIONS

Make

Ford

Displacement

3.0 liters

Cylinder Arrangement

V-6

Valve Arrangement

Overhead Valve

Firing Order

1-4-2-5-3-6

Number of Main Bearings

4

Compression Ratio

9.3 to 1

No. of Teeth on Flywheel

164

Ignition Timing at 1800 rpm

30 degrees BTDC

Spark Plug Gap

0.035-0.045 inch

Recommended Spark Plugs

 

Motor Craft

AG, SF 32PGM

Oil Pressure

40-50 psi

Crankcase Oil Capacity

5.0 U.S. quarts (4.7 liters)

Recommended Engine Oil

SAE 5W-20

Type of Cooling System

Pressurized, closed recovery

Cooling Fan

Pusher Type

Cooling System Capacity

3.0 U.S. gallons (11.4 liters)

Recommended Coolant

Use a 50-50 mixture of

 

ethylene glycol base

 

and de-ionized water.

1.11 FUEL CONSUMPTION

Natural Gas:

% of Load

25%

50%

75%

100%

m3/hr

3.1

5.9

8.5

11.0

ft3/hr

110.3

209.0

299.5

387.0

LP Vapor:

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.

1.12RECONFIGURING THE FUEL SYSTEM

NOTE:

All models are configured for natural gas from the factory.

To reconfigure the fuel system from NG to LP vapor, follow these steps:

1.Turn the main gas supply off.

2.Remove the carburetor fuel hose from the outlet port (Port 1) of the demand regulator (Figure 1.8).

3.Remove the brass hose fitting from the outlet port (Port 1) of the demand regulator.

4.Remove pipe plug from Port 2.

5.Install brass hose fitting into Port 2.

6.Install pipe plug into Port 1.

7.Connect carburetor gas hose to brass fitting.

8.Tighten all clamps and plugs.

9.Make sure fuel supply is of the proper pressure and type for configuration.

10.Reverse the procedure to convert back to natural gas.

Figure 1.8 — Reconfigure the Fuel System

 

Port 1

 

Port 2

 

FUEL HOSE

FUEL HOSE

 

PLUG

BRASS HOSE

BRASS HOSE

PLUG

FITTING

FITTING

 

 

OUT

OUT

 

 

PORT 1

PORT 2

 

 

HOUSING

HOUSING

 

 

PORTS

 

 

PORTS

 

 

 

 

% of Load

25%

50%

75%

100%

m3/hr

1.3

2.4

3.5

4.5

ft3/hr

45.6

86.4

123.8

160.0

NG FUEL SYSTEM

LP FUEL SYSTEM

NOTE:

NOTE:

Fuel consumption is given at rated maximum con- tinuous power output when using natural gas rated at 1000 Btu per cubic foot. LP gas is rated at 2520 Btu per cubic foot. Actual fuel consumption obtained may vary depending on such variables as applied load, ambient temperature, engine condi- tions and other environmental factors.

Port 1 is for NG only and Port 2 is for LP vapor only. No provision for dual fuel has been made.

DANGER

Serious injury or damage may occur if not con-

!figured properly. Please consult an authorized Generac Service Dealer with any questions.

Generac® Power Systems, Inc. 7

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Contents Liquid-cooled, Prepackaged Standby Generators ‹ Operation and Maintenance Authorized Service Dealer Location‹ HOW to Obtain Service IntroductionTable of Contents General Hazards Electrical Hazards Generator Transfer SwitchAutomatic System Operation Generator AC Connection Systems‹ 1.7.1 LOW OIL Pressure Switch ‹ 1.7.2 High Coolant Temperature Switch‹ 1.7.3 LOW Coolant Level Switch Engine Protective DevicesLifting the Generator UnpackingReconfiguring the Fuel System Specifications‹ 1.10.1 Generator Specifications ‹ 1.10.2 Engine SpecificationsBefore Installation Torque SpecificationsEngine OIL Recommendations Coolant RecommendationsBasic Standby Electric System Generator Mounting SupportGenerator Location Emergency Circuit Isolation MethodTotal Circuit Isolation Method Transfer Switch Signal ConnectionsGrounding the Generator Generator AC Neutral Connections‹ 2.11.2 Transfer Switch Battery InstallationPreparation Before START-UP ‹ 2.11.1 Prior to Initial START-UPControl Console Components Using a Standard GTS Transfer Switch‹ 3.2.2 Fault Indicator LED Manual Transfer START-UP Engine Governor Adjustments‹ 3.2.5 SET Exercise Time Switch ‹ 3.2.6 System Ready LEDWeekly Exercise Cycle Retransfer and ShutdownAutomatic Operation Overload Protection for Engine DC Electrical System Checking Fluid LevelsCooling System ‹ 4.4.3 Engine Coolant ‹ 4.5.2 Check Battery‹ 4.5.1 Check Engine OIL Level ‹ 4.5.3 Exercise System‹ 4.5.11 Changing the Engine AIR Cleaner Miscellaneous Maintenance‹ 4.6.1 Cleaning the Generator ‹ 4.5.13 Coolant Change‹ 4.6.4 Battery Replacement ‹ 4.6.3 Battery MaintenanceService Maintenance Interval Information Scheduled MaintenanceLevel Maintenance Level Problem Cause Correction Troubleshooting PointsInstallation Diagram Customer Connection PCB J2 ICT LOS WLS HCT Starter Carrier Bolt Battery Post Cover Baclk Boot Battery CableBattery Post Cover RED + Hold Down Battery32 18 Assembly BASE-DOOR Ground Wire Assy GRD Wire 99HSBIntake Duct HSB Duct Discharge RH FrontGenerac Power Systems, Inc Control BOX HSB Assy 2A 12V UL BatteryCover Front Panel HSB Cover TOP Panel HSB512 Not SHOWN-USED to Hold OIL Drain Assembly Wire SET 3.0L Ford notWasher Lock M12 Bracket DC ALT 3.0L FordFrame Radiator R-IN,L-OUT Tank Coolant RecoveryVenturi 3.0L Ford HSB Side Support Radiator HSBNER Flange Fuel Inlet Weldment Mounting BaseAssy Regulator 3.0L NG or LPV Washer Flat 5/16 ZincLeads Rotor 390 20KW 1P Direct HSB 2.5L Ford Rotor 390 15KW 1P Direct HSB 2.5L FordRotor 390 25KW 1P Direct HSB 2.5L Ford Rotor 390 40KW 1P Direct HSB 3.9L ChryslerGasket Exhaust Ring MUFFLER, 3.0L FordMufflr Strap 6IN DIA HSB Washer Lock 3/8 SSCover AIR Cleaner ELEMENT, AIR CleanerTube AIR Intake 3.0L Ford Washer Flat M5Guardian Liquid-cooled 27 kW and 30 kW Generators Guardian Liquid-cooled 27 kW and 30 kW Generators This Warranty Shall not Apply to the Following

004988-1 specifications

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