Kohler Decision-Maker 3000 User Manual

163Section 9 Gas Fuel SystemsTP-6356 4/12
Section 9 Gas Fuel Systems
This section describes various gas fuel systems and
contains troubleshooting information. Fuel system
information provided in this section relates to fuel
configurations not addressed in the engine operation
manual and/or engine service manual.
9.1 Gas Fuel Systems (REZG_ and
REZX_/RZX_ models)
This section describes natural gas and liquified
petroleum gas (LPG) fuel systems that are not covered
in the engine operation manual or engine service
manual.
9.1.1 Gas Fuel System Concept
(Single Fuel)
The gas fuel system uses a fuel solenoid valve to control
the fuel flow to the electronic-controlled pressure
regulator (EPR). The generator set-mounted EPR
reduces the fuel pressure as fuel passes to the fuel
mixer. SeeFigure9-1.
The fuel mixer controls the ratio of fuel to air under
varying load and speed conditions. Because the fuel
mixer receives fuel in a gaseous state, it does not have
to vaporize the fuel.
9.1.2 LPG Liquid Withdrawal Fuel
System Concept
With the LPG liquid withdrawal fuel system, pressurized
liquid LPG fuel passes from the tank to a vaporizer. The
vaporizer converts the liquid fuel to gas before sending it
to the fuel EPR. The system also includes a fuel
solenoid valve that shuts off the fuel flow when the
engine stops. Contact an authorized service
distributor/dealer for availability.
9.1.3 Natural Gas and LPG Conversion
Most models operate on either natural gas or LPG fuel
by performing the fuel conversion procedure. A hang
tag on the fuel regulator may provide additional
conversion setup information. Fuel conversion may
decrease generator set output. Refer to the respective
generator set spec sheet for ratings based on fuel
selection. Changing fuel does not alter the emissions
compliance of the generator set engine. Consult your
local generator set distributor/dealer for additional
information.
SB-700
1. Electronic-controlled pressure regulator (EPR)
2. Fuel mixer
3. Fuel solenoid valve
(UL--listed models require 2 fuel solenoid valves)
1
2
3
Figure 9-1 Fuel Regulator and Valve, Typical
Note: If a gas-fueled model has the fuel type changed
(LPG to natural gas or
natural gas to LPG), order
a new nameplate from an authorized distributor/
dealer with the updated ratings and attach to the
generator set.
To change the fuel type, change the electrical
connections between the fuel system and the engine
ECM. The engine ECM has fuel tables and spark
advance curves programmed for both natural gas and
LPG. The information shown below, in Figure 9-2, and
in Figure 9-3 generally apply to all models and all fuels.
Be sure to review the respective wiring diagram for your
specific model for possible special applications.
Natural Gas Operation
D Disconnect lead 65 from lead N5.
D Disconnect lead 73B from the fuel solenoid valve.
D Connect lead 73A to the fuel solenoid valve.
LPG Vapor Operation
D Disconnect lead 73A from the fuel solenoid valve.
D Connect lead 73B to the fuel solenoid valve (LPG
vapor).
D Connect lead 65 to lead N5 (ground).
LPG Liquid Withdrawal Operation
D Disconnect lead 73A from the fuel solenoid valve.
D Connect lead 73B to the fuel solenoid valve (LPG
liquid withdrawal).
D Connect lead 65 to lead N5 (ground).

Kohler Decision-Maker 3000 Specifications

General

Brand	Kohler
Model	Decision-Maker 3000
Category	Controller
Language	English