Generac
®
Power Systems, Inc.
7
1.6
SYSTEM SET LED
The “System Set” LED is lit when all of the following
conditions are true:
1. The AUTO/OFF/MANUAL switch is set to the
AUTO position.
2. The utility voltage being supplied to the unit is
being sensed by the PCB. If the utility sense volt-
age is not connected to the unit or if it is below
168 volts AC, then the system set light will flash
rapidly. This indicates that if the AUTO/OFF/
MANUAL switch is placed in the AUTO position,
the generator will start.
3. The “Not In Auto” dip switch is set to the OFF
position on the control board.
4. No alarms are present, for example, low oil pres-
sure, high temperature, etc.
1.7
FUEL 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 tamper-proof dual
fuel systems. The unit will run on natural gas or LP
gas, but it has been factory set to run on natural gas.
Should the primary fuel need to be changed to LP
gas, the fuel system needs to be reconfigured. See
Section 1.8 for instructions on reconfiguration 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 the
fuel supplier for the Btu content of the fuel.
Fuel pressure for both natural gas and liquid
propane set ups must be
11 inches to 14 inches of
water column (0.4 - 0.5 psi) at all load ranges
.
NOTE:
A separate gas line and regulator may be needed
to assure proper gas pressure (11-14”) to the gen-
erator. Low gas pressure can cause hard starting
and could affect engine durability.
1.8
FUEL CONSUMPTION
* Natural gas is in cubic feet per hour.
** LP is in gallons per hour/cubic feet per hour.
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.
1.9
RECONFIGURING THE
FUEL SYSTEM
To reconfigure the fuel system from NG to LP,
follow these steps (Figure 1.2):
NOTE:
The primary regulator for the propane supply is
NOT INCLUDED with the generator. There MUST
BE fuel pressure of 11 to 14 inches of water col-
umn (0.6 psi) to the fuel inlet of the generator.
1. Turn off the main gas supply.
2. Remove the engine air in baffle located on the left
hand side of the battery compartment. Two M6
screws are located on top of the baffle and two
M6 screws are located on the inside of the baffle
towards the back.
3. Remove the small hose clamp and hose from the
fuel regulator. It may be necessary to pry the hose
off the brass fitting using a screw driver to gently
lift up the hose edge.
4. Remove the brass hose fitting screwed into the
fuel regulator.
5. Locate and identify the brass idle jet. This will be
located in the fuel regulator casting facing the
front of the unit.
6. Remove the idle jet from its holding location.
7. Replace the idle jet, thread side first, into the
threaded hole originally occupied by the brass
hose fitting.
8. Using a short No. 2 Phillips screw driver, thread
the idle jet into the regulator casting. DO NOT
OVER TIGHTEN.
Figure 1.2 – Demand Regulator
BRASS HOSE
FITTING
IDLE CIRCUIT
PORT
PRESSURE
U
1
T
O
TAP
1/8 NPT
BRASS HOSE
FITTING
FUEL HOSE
SMALL
FUEL JET
REGULATOR
HOUSING PORT
ADJUSTER
SCREWS
OUTLET PORTS
Section 1 — General Information
Centurion 11, 13 and 15 kW Air-cooled Generators
Model #
Nat. Gas (*)
LP Vapor (**)
1/2 Load
Full Load
1/2 Load
Full Load
005011
114
185
1.34/48.9
2.17/79.0
004666
148.5
240
1.73/63.2
2.80/102.3