Kohler 12RESM1 manual Fuel Conversion, Fuel Pipe Size

1.6.2Fuel 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.)		Pipe Size, in. NPT
9.2	(30)	3/4
30.0	(100)	1
68.6	(225)	1 1/4

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

Minimum Gas Pipe Size Recommendation, in. NPT

Pipe Length,		Natural Gas		LP Vapor
m (ft.)		(242,000 Btu/hr.)		(280,000 Btu/hr.)
8	(25)		1	3/4
15	(50)		1		1
30	(100)	1	1/4		1
46	(150)	1	1/4	1	1/4
61	(200)	1	1/4	1	1/4

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

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 generator set. Remove the negative (--) lead first when disconnecting the battery. Reconnect the negative (--) lead last when reconnecting the battery.

Disabling the generator set. Accidental starting can cause severe injury or death. Before working on the 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.

1.7.1Fuel 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.

20 Section 1 Installation TP-6516 4/09