Section 1 — General Information

Guardian Liquid-cooled 40 kW Generator

￿1.7.1.1 Generator and Load Compatibility

The generator must be fully compatible with the rated voltage, number of phases and frequency of the con- nected electrical loads. The generator, connected elec- trical devices, or both, can be damaged if voltage, num- ber of phases and frequency are not compatible.

Note:

This manual assumes that the standby generator has been properly selected, installed and intercon- nected by a competent, qualified electrician or installation contractor. Once the installation is complete, do nothing that may result in noncom- patibility between the generator and connected electrical loads.

￿ 1.7.2 ENGINE

Make

General Motors

Displacement

4.3 liters (262 cu. in.)

Cylinder Arrangement

V-6

Valve Arrangement

Overhead Valves

Firing Order

1-6-5-4-3-2

Number of Main Bearings

4

Compression Ratio

9.4-to-1

No. of Teeth on Flywheel

168

Ignition System

Electronic

Ignition Timing at 1,800 rpm

40 degrees BTDC

Rated Horsepower at 1,800 rpm

67

Spark Plug Gap

0.045 inch (1.1 mm)

Recommended Spark Plugs

......AC 41-932 or equivalent

Oil Pressure

30-50 psi

Crankcase Oil Capacity

4.5 U.S. quarts (4.25 L)

Recommended Engine Oil

SAE 15W-40

Type of Cooling System

Pressurized, closed recovery

Cooling Fan

Pusher Type

Cooling System Capacity

4.5 U.S. gallons (17 L)

Recommended Coolant

Use a 50-50 mixture of

ethylene glycol and soft water.

Fuel Consumption

 

 

Natural Gas

 

 

004373-1 & 004626-0

720 cfh

LP Gas

 

 

004373-1 & 004626-0

288 cfh/7.9gph

1.8FUEL REQUIREMENTS

AND RECOMMENDATIONS

With LP gas, use only the vapor withdrawal system. This type of system uses the vapors formed above the liquid fuel in the storage tank.

Recommended fuels should have a Btu content of at least 1,000 Btus per cubic foot for natural gas; or at least 2,520 Btus per cubic foot for LP gas. Ask your fuel supplier for the Btu content of your fuel.

Fuel pressure for both natural gas and liquid propane setups should be 11 inches to 14 inches of water column (0.6 psi) at all load ranges.

Gaseous fuels such as natural gas and liquid propane (LP) gas are highly explosive. Even the slightest spark can ignite such fuels and cause an explosion. 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 – install leak detectors accord- ingly.

￿1.8.1 CONVERSION TO LP GAS VAPOR

The generator is shipped from the factory configured for using natural gas as fuel. To convert the fuel system to LP gas, proceed as follows (Figure 1.5).

1.Remove end cap from the pressure reducer valve.

2.Turn the tension screw counterclockwise until all ten- sion is removed from the inner spring.

3.Install and tighten the end cap.

4.Invert the pressure reducer valve. In other words, turn it upside down (end cap facing downward).

5.Purge and leak test the entire fuel system according to gaseous fuel codes. NO LEAKS can appear at any point in the system.

Figure 1.5 – Conversion to LP Gas Vapor

6 Generac® Power Systems, Inc.

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Generac 004373-1, 004626-0 owner manual Fuel Requirements Recommendations, Generator and Load Compatibility, Engine