Kohler 12RES

the recommended fuel ratings for natural gas and LP
vapor fuels. Contact the natural gas utility for flow rate
information or a gas meter upgrade.
Fuel System
Fuel types Natural Gas or LP Vapor
Fuel supply inlet 1/2 NPT
Fuel supply pressure,kPa (in, H20) 1,7-2.7 (7-11)
Nominal Fuel Rating Btu/ft 3 MJ/m 3
Natural gas 1000 37
LP vapor 2500 93
Figure 6-6 Fuel Supply
Fuel 8.5RES 12RES
Consumption,
m3/hr. (cfh) 60 Hz 50 Hz 60 Hz 50 Hz
Natural Gas at % load
109% 3,7 (132) 3,3 (118) 5,9 (209) 4,9 (175)
75% 3,2 (113) 2,9 (101) 4,8 (168) 4,9 (141)
50% 2,6 (93) 2,3 (83) 3,6(127) 3,0(106)
25% 2,2 (77) 1,9 (69) 2,4 (85) 2,0 (71)
LP Vapor at % load
100% 2,0 (72) 1,7 (61) 3,1 (108) 2,5 (89)
75% 1,3 (45) 1,1 (38) 2,5 (87) 2,0 (72)
50% 1.0 (36) 0.9 (31) 1.9 (65) 1.5 (53)
25% 0,8 (29) 0,7 (25) 1,2 (44) 1,0 (36)
LP vapor conversionfactors:
8,58 ft3= 1 lb.
36,39 ft3 = 1 gal.
Figure 6-7 Fuel Consumption
Gas Flow Rate
Generator Set Model Btu/hro MJ/hr.
8.5RES 132,000 139
12RES 202,000 213
Figure 6-6 Natural Gas Flow Rate
6.8.2 Fuel Pipe Size
Ensure that the natural gas pipe size and length meet
the specifications in Figure 6-9. 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 pipe size and length with the chart
in Figure 6-9. If the piping is longer than the maximum
length shown for that size, replace it with the specified
size before proceeding.
Contact the local LP provider for LP installation
information.
Maximum Pipe Length m (ft.)
Pipe Size 8.5RES 12RES
3/4 in. NPT 18.3 (60) 9,2 (30)
1 in, NPT 61 (209) 30 (109)
1 1/4 in, NPT 91,5 (300) 68.6 (225)
Figure 6-9 Maximum Natural Gas Pipe Length
6.8.3 Fuel Conversion
_1_ 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
setasfollows: (1) Movethegeneratorsetmasterswitchtothe
OFFposition. (2) Disconnectthepowertothebatterycharger.
(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.
28 Section6 Installation TP-6195 1/04