Alpha Technologies AlphaGen 3.5_5.0kW Kohler COM5 - Manual (Page 28)

TP-6482 8/06 28 Section 3 Scheduled Maintenance
The manufacturer ships the generator set with the fuel
system set for natural gas. To convert to LP gas, use the
following procedure to move the fuel line from the
natural gas inlet port to the LP inlet port in the fuel block
(or from the LP inlet to the natural gas inlet to convert
from LP to natural gas). See Figure 3-7 for the LP and
natural gas fuel connection and fuel block locations.
Also see the service views in Section 1.4.
1. Battery harness connector
2. Fuel block
3. LP and natural gas metering valves
4. LP and natural gas inlet ports
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Figure 3-7 Fuel System Conversion
Fuel Conversion Procedure
1. Remove the cabinet front door and the generator
compartment front panel to access the fuel system.
2. Disconnect the battery at the quick-disconnect
plug.
3. Turn off the fuel supply by closing the upstream
valve outside of the cabinet.
4. Remove the hose clamp and fuel line hose from the
fuel inlet.
5. Remove the hose fitting from the natural gas (or
LP) inlet in the fuel metering valve.
6. Remove the plug from the LP (or natural gas)
metering valve. Clean the plug with a dry cloth or
brush, apply fresh pipe sealant, and install it into
the natural gas (or LP) inlet.
7. Clean the hose fitting with a dry cloth or brush,
apply fresh pipe sealant, and install it into the LP (or
natural gas) metering valve inlet. Do not adjust the
fuel metering valves.
8. Slide the hose onto the hose fitting and secure it
with the clamp.
9. Turn on the fuel supply and check for leaks using a
gas leak detector.
10. Reconnect the battery harness.
11. Install the generator compartment front panel. Set
the generator set master switch to AUTO position
to return the generator set to standby service.
12. Replace the cabinet door.
3.7 Battery
Use a 12-volt battery with a minimum rating of 425 cold
cranking amps at --18
_C (0_F). The wiring diagrams in
Section 8 show the battery connections. The generator
set uses a negative ground system. Make sure that the
battery is connected correctly and the terminals are
tight.
Note: The generator set will not start and circuit board
damage may result if the battery is connected in
reverse.
Generator sets that are not used regularly require an
external battery charger to keep the starting battery fully
charged. Observe the battery polarity when connecting
the battery charger.
All generator set models use a negative ground with a
12-volt engine electrical system. See Figure 3-8 for the
location of the ground connection.
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1. Ground connection on chassis frame
Figure 3-8 Ground Connection