System Set Led; Fuel Requirements And Recommendations; Fuel Consumption - Generac Power Systems Automatic Standby Generators Owner's Manual

1.7

SYSTEM SET LED

The "System Set" LED (single cylinder) or "Ready to
Run" on the display (v-twin) is ready 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 (8kW). 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.
1.8 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 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.
Required fuel pressure for natural gas is five (5)
inches to seven (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). The
primary regulator for the propane supply is NOT
INCLUDED with the generator.
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-
shal to check codes and regulations for proper instal-
lation. Local codes will mandate correct routing of
gaseous fuel line piping around gardens, shrubs and
other landscaping to prevent any damage.
8
Section 1 — General Information
Air-cooled Generators
NOTE:
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.
1.9

FUEL CONSUMPTION

Nat. Gas
Unit
1/2 Load
7/8 kW 77
9/10 kW 102
12/12 kW 152
13/14 kW 156
16/16 kW 183
16/17 kW 183
18/20 kW 206
* Natural gas is in cubic feet per hour.
** LP is in gallons per hour/cubic feet per hour.
*** Values given are approximate.
Verify that gas meter is capable of providing enough
fuel flow to include household appliances.
1.9.1 BTU FLOW REQUIREMENTS -
NATURAL GAS
BTU flow required for each unit based on 1000 BTU
per cubic foot.
• 7kW — 140,000 BTU/Hour
• 9kW — 156,000 BTU/Hour
• 12kW — 215,000 BTU/Hour
• 13kW — 220,000 BTU/Hour
• 16kW — 261,000 BTU/Hour
• 18kW — 294,000 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.
LP Vapor
Full Load 1/2 Load Full Load
140 0.94/34
156 1.25/46
215 1.53/56
220 1.56/58
261 1.59/58
261 1.61/59
294 1.89/69
1.68/62
1.93/70
2.08/76
2.30/84
2.51/91
2.57/94
2.90/106