Kohler KG80 Maintenance Manual page 28

KG150, KG180, and KG200 (Kohler Engine KG10V08T) Dual Fuel Operation
The automatic changeover dual fuel systems that include a dual-fuel reset box allow the system to switch to LPG fuel
automatically if the natural gas supply is not available. If the natural gas fuel supply is sufficient, the fuel system will change back
to natural gas automatically when the LPG fuel supply runs low or when the generator set stops and restarts.
The dual-fuel reset box contains an LPG indicator light and a reset switch. The LPG indicator light turns on when the NG fuel
valve closes and the LPG fuel valve opens, indicating that the fuel source has switched. The manual reset switch allows manual
return to natural gas, if available. See the operation summary below.

The system switches over to LPG.

LPG fuel valve opens.

Indicator light turns on indicating the unit is running on LPG vapor.

Low fuel pressure warning activates (due to loss of primary fuel supply).
The unit will return to NG fuel if:

The NG fuel pressure is at a sufficient level and the manual reset switch is activated (separate box with a switch and
light).
Note:
The manual reset switch can be activated while the unit is running.

LPG fuel supply is lost or insufficient.
Note:
If NG fuel supply has still not returned, the unit will shut down due to not having an available fuel source.

The generator set is shut down and restarted.
o
Utility returns.
o
Off button is manually pressed.
o
E- Stop is pressed.
LPG indicator light
Figure 9 Dual Fuel System with Reset Box, KG150/180/200
28
Manual reset switch
UL Fuel solenoid valve
Primary (NG) fuel valve
Backup (LPG) fuel valve
TP-7173 10/20