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Manual Generac QT08054KNANA Generator

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Manual

FUEL SYSTEM

FUEL REQUIREMENTS 

The Stationary Emergency Generator may be equipped

with one of the following fuel systems:

• Natural gas fuel system

• Propane vapor (PV) fuel system

• Liquid propane (LP) fuel system

The Manual Drawing Listing that is affixed to the

unit includes the “Identification Code,” which may be

used to identify the type of fuel system installed on

the unit.

Recommended fuels should have a Btu content of at

least 1,000 Btu's per cubic foot for natural gas; or at

least 2,520 Btu's per cubic foot for LP gas. Ask the

fuel supplier for the Btu content of the fuel.

Required fuel pressure for natural gas is 11 inches

to 14 inches water column (0.4 to 0.5 psi); and for

liquid propane, 11 inches to 14 inches of water

column (0.4 to 0.5 psi).

NOTE:

Any piping used to connect the generator to the

fuel supply should be of adequate size to ensure

the fuel pressure NEVER drops below 11 inches

water column for natural gas or 11 inches water

column for liquid propane for all load ranges.

NOTE:

It is the responsibility of the installer to make sure

that only the correct recommended fuel is sup-

plied to the generator fuel system. Thereafter, the

owner/operator must make certain that only the

proper fuel is supplied.

NATURAL GAS FUEL SYSTEM 

Natural gas is supplied in its vapor state. In most

cases, the gas distribution company provides piping

from the main gas distribution line to the standby

generator site. The following information applies to

natural gas fuel systems.

• Gas pressure in a building is usually regulated by

national, state and local codes.

• To reduce gas pressure to a safe level before

the gas enters a building, a primary regulator is

needed. The natural gas supplier may or may not

supply such a regulator.

• It is the responsibility of the gas supplier to make

sure sufficient gas pressure is available to operate

the primary regulator.

• Gas pressure at the inlet to the fuel shutoff sole-

noid should not exceed approximately 14 inches

water column (0.5 psi). Optimum pressure at the

fuel shutoff solenoid is 11 inches water column

(0.4 psi).

PROPANE VAPOR WITHDRAWAL FUEL SYSTEM 

This type of system utilizes the vapors formed above

the liquid fuel in the supply tank. Approximately 10

to 20 percent of the tank capacity is needed for fuel

expansion from the liquid to the vapor state. The

vapor withdrawal system is generally best suited for

smaller engines that require less fuel. The installer

should be aware of the following:

• The natural gas and LP gas systems are similar.

However, the natural gas system delivers gas at a

pressure of approximately five inches water col-

umn to the carburetor.

• When ambient temperatures are low and engine

fuel consumption is high, the vapor withdrawal

system may not function efficiently.

• Ambient temperatures around the supply tank

must be high enough to sustain adequate vaporiza-

tion, or the system will not deliver the needed fuel

volume.

• In addition to the cooling effects of ambient air, the

vaporization process itself provides an additional

cooling effect.

LP FUEL SYSTEM 

LP is supplied as a liquid in pressure tanks. It is

usually made up of propane, butane, or a mixture of

the two gases. Propane tends to vaporize readily even

at temperatures as low as -20° F (-29° C). However,

butane reverts to its liquid state when temperatures

drop below 32° F (0° C).

LP in a liquid withdrawal system must be converted

to its gaseous state before it is introduced into the

engine carburetor. A vaporizer-converter is generally

used to accomplish this. In such a converter, heated

engine coolant is ported through the converter to

provide the necessary heat for conversion of the fuel

from a liquid to a gaseous state.

5-1

Stationary Emergency Generator

Fuel Systems

FuelSys002 Rev. B 10/08

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