Section 1 — General Information
1.6FUEL 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.
The engine has been fitted with a fuel carburetion
system that meets the specifications of the 1997 California Air Resources Board for
Should the primary fuel need to be changed to LP
gas, the fuel system needs to be reconfigured. See Section 1.8 (Page 7) for instructions on reconfigura- tion of the fuel system.
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 set ups must be 11 inches to 14 inches of water column (0.6 psi) at all load ranges.
NOTE:
A seperate gas line and regulator may be needed to assure proper gas pressure
1.7FUEL CONSUMPTION
| Model # | Nat. Gas (*) | LP Vapor (**) |
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| 1/2 Load | Full Load | 1/2 Load | Full Load |
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| 114 | 170 | 1.33/45.8 | 1.98/72.5 |
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*Natural gas is in cubic feet per hour.
**LP is in gallons per hour/cubic feet per hour.
1.Turn off the main gas supply.
2.Remove the three carburetor fuel hoses from the outlet ports of the demand regulator.
3.Disconnect wire #0 and wire #14 from the gas solenoid located on the top of the demand regu- lator.
4.Remove the demand regulator from the enclosure by rotating counterclockwise.
5.Remove the small jet (0D5698A) located in the side of the regulator housing and install it into the small threaded hole in the idle circuit port on the regulator.
7.Refit the brass hose fitting to the idle circuit port of the regulator. Use pipe thread sealant to reseal the threads on the hose fitting.
8.Identify both adjustment screws.
NOTE:
One adjustment screw can be accessed from the front of the unit and the second can be accessed from the back of the unit.
9.The unit has been factory set to run on NG fuel. To reset the system to run on LP fuel, turn the two adjustment screws 1/2 turn clockwise. Use a large screwdriver to make this adjustment.
10.The fuel system will now allow the engine to run on LP fuel. It may be necessary to make minor adjustments to the preset screw settings to achieve maximum power. If you experience prob- lems with the unit producing maximum power, follow the procedure in Section 2.6, “Adjusting the Regulator”.
11.Reverse procedure steps
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.
1.8RECONFIGURING THE
FUEL SYSTEM
To reconfigure the fuel system from NG to LP, follow these steps:
NOTE:
Figure 1.2 – Demand Regulator
FUEL HOSE
BRASS HOSE
FITTING
IDLE CIRCUIT | O |
| BRASS HOSE | SMALL |
PORT | U |
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T | PRESSURE | FITTING | ||
| 1 | TAP |
| FUEL JET |
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| 1/8 NPT |
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| REGULATOR |
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| HOUSING PORT |
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| ADJUSTER |
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| SCREWS |
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The primary regulator for the propane supply is NOT INCLUDED with the generator. You must sup- ply a fuel pressure of 11 to 14 inches of water col- umn (0.6 psi) to the fuel inlet of the generator.
Generac® Power Systems, Inc. 7