Kohler 12RESM1 manual Fuel Requirements, Fuel Supply

1.6 Fuel Requirements

The generator set operates using natural gas or LP vapor fuel. The generator set is EPA-certified for both natural gas and LP vapor fuels.

The fuel system installation must comply with the NEC and local codes.

1.6.1Fuel Supply

Because of variable climates and geographical considerations, contact the local fuel supplier for fuel system planning and installation. Figure 1-10 lists the recommended fuel ratings and other fuel supply information for natural gas and LP vapor fuels.

Fuel types	Natural Gas	LP Vapor
Fuel supply inlet	1/2 NPT
Fuel supply pressure,
kPa (in. H2O), 12 kW	1.3--2.7 (5-11)	1.7--2.7 (7-11)
Fuel supply pressure,
kPa (in. H2O), 17/18 kW	1.7--2.7 (7-11)
Fuel flow rate, Btu/hr.,
12 kW	193000	203000
Fuel flow rate, Btu/hr.,
17/18 kW	242000	280000
Nominal Fuel Rating, Btu/ft3
Natural gas	1000
LP vapor	2500

Figure 1-10 Fuel Supply

Verify that the output pressure from the primary gas utility (or LP tank) pressure regulator is within the range shown in Figure 1-10 and that the utility gas meter flow rate is sufficient to supply the generator set at rated load plus all other gas-consuming appliances. See Figure 1-11 or Figure 1-12 for fuel consumption. Contact the fuel supplier for flow rate information or a gas meter upgrade.

See Figure 1-2 or Figure 1-4 for the location of the fuel inlet connection. Use flexible sections to prevent fuel line breakage caused by vibration. Hold the fuel solenoid valve with a wrench when tightening the fuel connections. Protect all fuel lines from machinery or equipment contact, adverse weather conditions, and environmental damage.

Fuel Consumption at % Rated Load

Natural Gas, m3/hr. (cfh)

100%	5.9	(209)
75%	4.8	(168)
50%	3.6	(127)
25%	2.4	(85)
LP Vapor, m3/hr. (cfh)
100%	3.1	(108)
75%	2.5	(87)
50%	1.9	(65)
25%	1.2	(44)

LP vapor conversion factors:

8.58ft.3 = 1 lb. 0.535 m3 = 1 kg

36.39ft.3 = 1 gal.

Nominal fuel rating:	37 MJ/m3 (1000 Btu/ft.3)
Natural gas:
LP vapor:	93 MJ/m3 (2500 Btu/ft.3)

Figure 1-11 Fuel Consumption, 12 kW Models

Fuel Consumption at % Rated Load

Natural Gas, m3/hr. (cfh)

100%	6.9	(242)
75%	5.8	(204)
50%	4.4	(155)
25%	3.4	(120)
LP Vapor, m3/hr. (cfh)
100%	3.2	(112)
75%	2.7	(96)
50%	2.1	(74)
25%	1.6	(57)

LP vapor conversion factors:

8.58ft.3 = 1 lb. 0.535 m3 = 1 kg

36.39ft.3 = 1 gal.

Nominal fuel rating:	37 MJ/m3 (1000 Btu/ft.3)
Natural gas:
LP vapor:	93 MJ/m3 (2500 Btu/ft.3)

Figure 1-12 Fuel Consumption, 17/18 kW Models

TP-6516 4/09 Section 1 Installation 19