Section 1 — General Information
1.10 SPECIFICATIONS
1.10.1 GENERATOR SPECIFICATIONS
Guardian 40kW
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.
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| Rated Max. Cont. | 37 (NG), 40 (LP) |
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| AC Power Output (kW) |
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| Rated voltage (volts) | 120/240 |
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| No. of Rotor Poles | 4 |
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| Driven Speed of Rotor | 1800 |
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| Rotor Excitation System | Direct excited brush type |
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| Type of Stator | 4 Wire |
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| Rotor/Stator Insulation | Class F/H |
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1.10.2 ENGINE SPECIFICATIONS
Make | Chrysler |
Displacement | 3.9 liters |
Cylinder Arrangement | |
Valve Arrangement | Overhead Valve |
Firing Order | |
Number of Main Bearings | 4 |
Compression Ratio | 9.1 to 1 |
No. of Teeth on Flywheel | 164 |
Ignition Timing at 1800 rpm | 30 degrees BTDC |
Spark Plug Gap | 1.01mm (0.040 in.) |
Recommended Spark Plugs |
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Champion | RC12LC4 |
Oil Pressure | |
Crankcase Oil Capacity | 4.0 U.S. quarts (3.8 liters) |
Recommended Engine Oil | SAE |
Type of Cooling System | Pressurized, closed recovery |
Cooling Fan | Pusher Type |
Cooling System Capacity | 5.0 U.S. gallons (19.3 liters) |
Recommended Coolant | Use a |
| ethylene glycol base |
| and |
1.11 FUEL CONSUMPTION
Natural Gas:
% of Load | 25% | 50% | 75% | 100% |
m3/hr | 4.1 | 7.7 | 11.0 | 14.2 |
ft3/hr | 143.1 | 271.1 | 388.5 | 502.0 |
LP Vapor:
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.
1.12 RECONFIGURING THE FUEL SYSTEM
Fuel pressure for both natural gas and liquid propane set ups should be 11 inches to 14 inches of water column (0.4 to 0.5 psi) at all load ranges.
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
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| Port 2 | |
| FUEL HOSE | FUEL HOSE |
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PLUG | BRASS HOSE | BRASS HOSE | PLUG | |
FITTING | FITTING | |||
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| OUT | OUT |
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| PORT 1 | PORT 2 |
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| HOUSING | HOUSING |
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| PORTS |
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| PORTS |
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% of Load | 25% | 50% | 75% | 100% |
m3/hr | 1.7 | 3.3 | 4.7 | 6.0 |
ft3/hr | 60.7 | 115.0 | 164.9 | 213.0 |
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.
NG FUEL SYSTEM | LP FUEL SYSTEM |
NOTE:
Port 1 is for NG only and Port 2 is for LP vapor only. No provision for dual fuel has been made.
Generac® Power Systems, Inc. 7
