Fuel Conversion - Kohler POWER SYSTEM 12RESM1 Installation Manual

Verify that the output pressure from the primary gas
utility (or LP tank) pressure regulator is within the fuel
supply pressure range shown in Figure 2-7 and that the
utility gas meter flow rate is sufficient to supply the
generator set plus all other gas-consuming appliances.
Figure 2-7 shows the flow rate required for the
generator set and
consumption. Contact the fuel supplier for flow rate
information or a gas meter upgrade.
Fuel Consumption at % rated load
Natural Gas
100%
75%
50%
25%
LP Vapor
100%
75%
50%
25%
Figure 2-8 Fuel Consumption
Ensure that the natural gas pipe size and length meet
the specifications in Figure 2-9.
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 2-9. If the piping is longer than the maximum
length shown for that size, replace it with the specified
size before proceeding.
Pipe Size
3/4 in. NPT
1 in. NPT
1 1/4 in. NPT
Figure 2-9 Maximum Natural Gas Pipe Length
Contact the local LP provider for LP pipe size
information.
Figure 2-10 shows 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.
18 Section 2 Installation
Figure 2-8 shows the
3
m /hr. (cfh)
5.4 (193)
4.7 (163)
3.5 (124)
2.6 (93)
3
m /hr. (cfh) kg/hr. (lb./hr.)
2.3 (81) 4.3 (9.4)
2.1 (75) 3.9 (8.7)
1.8 (60) 3.4 (7.0)
1.2 (45) 2.2 (5.2)
Measure the pipe
Maximum Pipe Length, m (ft.)
9.2 (30)
30 (100)
68.6 (225)
fuel
1. DSAM connector location
2. Fuel hose and elbow fitting
3. Fuel inlet, 1/2 in. NPT female
Figure 2-10 Fuel System Locations, Air Inlet Side
2.5.2

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.
An LP fuel jet is included with the generator set.
Conversion to LP fuel involves the following:
D
Installation of the fuel jet.
D
Disconnection of the digital spark-advance module
(DSAM) leads.
Use the following procedure to convert from natural gas
to LP vapor.
component locations.
Accidental starting.
Can cause severe injury or death.
Disconnect the battery cables before
working
Remove the negative (--) lead first
when disconnecting the battery.
Reconnect the negative (--) lead last
when reconnecting the battery.
2
1
See Figure 2-10 for the fuel system
WARNING
on the generator set.
3
ADV-7023A
TP-6397 4/07