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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
approximately 150-160 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. 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 sys-
tem. 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 the
Reconfiguring the Fuel System section for instruc-
tions 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.
Required fuel pressure for natural gas is 5 inches
to 7 inches water column (0.18 to 0.25 psi); and
for liquid propane, 10 inches to 12 inches of water
column (0.36 to 0.43 psi).
NOTE:
All pipe sizing, construction and layout must com-
ply with NFPA 54 for natural gas applications and
NFPA 58 for liquid propane applications. Once the
generator is installed, verify that the fuel pressure
NEVER drops below four (4) inches water column
for natural gas or 10 inches water column for liq-
uid propane.
Prior to installation of the generator, the installer
should consult local fuel suppliers or the fire mar-
shall to check codes and regulations for proper
installation. Local codes will mandate correct routing
of gaseous fuel line piping around gardens, shrubs
and other landscaping to prevent any damage.
Special considerations should be given when install-
ing the unit where local conditions include flooding,
tornados, hurricanes, earthquakes and unstable
ground for the flexibility and strength of piping and
their connections.
Use an approved pipe sealant or joint compound on
all threaded fitting.
All installed gaseous fuel piping must be purged and
leak tested prior to initial start-up in accordance with
local codes, standards and regulations.
1.8 FUEL CONSUMPTION
*Natural gas is in cubic feet per hour.
**LP is in gallons per hour/cubic feet per hour.
*** Values given are approximate.
1.8.1 BTU FLOW REQUIREMENTS -
NATURAL GAS
BTU flow required for each unit based on 1000 BTU
per cubic foot.
6kW — 119,000 BTU/Hour
9kW — 156,000 BTU/Hour
13kW — 220,000 BTU/Hour
15kW — 245,000 BTU/Hour
DANGER
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.
NOTE:
A minimum of one approved manual shut-off valve
must be installed in the gaseous fuel supply line.
The valve must be easily accessible. Local codes
determine the proper location.
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Section 1 — General Information
Air-cooled Generators
Unit Nat. Gas (*) LP Vapor (**)
1/2 Load Full Load 1/2 Load Full Load
6/7 kW 66 119 0.82/30 1.47/54
9/10 kW 102 156 1.25/46 1.93/70
13/13 kW 156 220 1.55/57 2.18/80
15/16 kW 173 245 1.59/59 2.51/92