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1.6.2

Fuel Pipe Size

Ensure that the natural gas pipe size and length meet

the specifications in Figure 1-13 or Figure 1-14.

Measure the pipe length from the primary gas pressure

regulator to the pipe connection on the generator set

fuel inlet. Add 2.4 m (8 ft.) to the measured length for

each 90 degree elbow. Compare the total pipe length

with the chart in Figure 1-13 or Figure 1-14 to find the

required pipe size.

Contact the local LP provider for LP installation

information.

Maximum Pipe Length, m (ft.)

9.2

(30)

30.0

(100)

68.6

(225)

Figure 1-13 12 kW Models, Fuel Pipe Size, Natural

Gas

Minimum Gas Pipe Size Recommendation, in. NPT

Pipe Length,

Natural Gas

m (ft.)

(242,000 Btu/hr.)

8 (25)

15 (50)

30 (100)

1 1/4

46 (150)

1 1/4

61 (200)

1 1/4

Figure 1-14 17/18 kW Models, Fuel Pipe Size,

Natural Gas

Section 1 Installation

Pipe Size, in. NPT

3/4

1 1/4

LP Vapor

(280,000 Btu/hr.)

3/4

1 1/4

1.7 Fuel Conversion

The multi-fuel system allows conversion from natural

gas to LP vapor (or vice-versa) in the field while

maintaining emissions-standard compliance. A trained

technician or authorized distributor/dealer can convert

the fuel system.

WARNING

Accidental starting.

Can cause severe injury or death.

Disconnect the battery cables before

working

on the

Remove the negative (--) lead first

when disconnecting the battery.

Reconnect the negative (--) lead last

when reconnecting the battery.

Disabling the generator set.

cause severe injury or death.

generator set or connected equipment, disable the generator

set as follows: (1) Move the generator set master switch to the

OFF position. (2) Disconnect the power to the battery charger.

(3) Remove the battery cables, negative (--) lead first.

Reconnect the negative (--) lead last when reconnecting the

battery. Follow these precautions to prevent starting of the

generator set by an automatic transfer switch, remote

start/stop switch, or engine start command from a remote

computer.

WARNING

Explosive fuel vapors.

Can cause severe injury or death.

Use extreme care when handling,

storing, and using fuels.

1.7.1

Fuel Conversion

For LP vapor fuel, an orifice is used in the fuel line. The

unit is typically shipped set up for natural gas, with the

loose orifice tied near the fuel line. To convert to LP

vapor, install the orifice and disconnect the spark

advance leads as described below. See Figure 1-15 for

the fuel system component locations.

generator set.

Accidental starting can

Before working on the

TP-6516 4/09