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1.7.2

Fuel Conversion, 20RES/RESL

For LP vapor fuel, an orifice is used in the fuel line. The

unit is typically shipped set up for natural gas, with the

loose orifice tied near the fuel solenoid valve. To convert

to LP vapor, install the orifice and disconnect the spark

advance leads as described below. See Figure 1-15 for

the fuel system component locations.

Procedure to Convert from NG to LP, 20RES/RESL

1. Press the OFF button on the generator set

controller and remove the F3 fuse (located in the

service access area).

2. Disconnect the power to the battery charger.

3. Disconnect the generator set engine starting

battery, negative (--) lead first.

4. Turn off the fuel supply.

5. Remove the hose clamp and fuel hose from the

hose fitting. See Figure 1-15.

6. Insert the orifice into the hose fitting.

Figure 1-15.

7. Slide the hose onto the hose fitting and secure it

with the clamp.

8. Disconnect digital spark-advance module (DSAI)

leads 65 and N5 for LP. The DSAI leads are located

near the fuel solenoid valve. See Figure 1-11 or

Figure 1-12.

9. Connect and turn on the new fuel supply.

10. Reconnect the generator set engine starting

battery leads, negative (--) lead last.

11. Reconnect power to the battery charger.

12. Reinstall fuse F3 and start the generator set by

pressing the RUN button on the generator set

controller.

TP-6733 8/11

Note: LP setup

shown

1. LP orifice

2. Hose fitting

3. Regulator

4. Fuel inlet, 1/2 in. NPT female

5. Vent hose

See

Figure 1-15 Fuel Regulator and LP Orifice,

20RES/RESL

13. Check for leaks using a gas leak detector.

14. Run the generator set and check the operation.

Use the controller to adjust the output and stability if

necessary. See Section 1.15 for instructions.

15. Press the OFF button to shut down the generator

set.

Conversion from LP to Natural Gas

To convert from LP vapor to natural gas, remove the fuel

orifice and connect the DSAI leads together.

Fuel

Natural Gas

Figure 1-16 DSAI Connections

DSAI Leads 65 and N

Connect lead 65 to N

Disconnect

Section 1 Installation

GM66563