Generac Power Systems MGG155 Operating Manual page 21

Apply pipe sealant to the NPT threads of the pipe fitting at the end of the natural gas fuel line. Connect the
4.
fuel line to the two inch inlet located on the right side of the unit's frame.
Note: Do not apply pipe sealant to the flared (flanged) end of the fuel pipe.
Apply pipe sealant to the NPT threads of the pipe fitting at the end of the LP liquid fuel line. Connect the fuel
5.
line to the 1/2 inch inlet located on the right side of the unit's frame.
Be certain that all connections are sealed and no leaks are present. The installer must verify that all gas
6.
connections comply with all building codes.
Verify fuel supply pressure is adequate.
7.
Formula Example:
If a unit has a 160 hp engine 60 feet from the supply, the engine needs 10,000 BTU/hr per hp to run efficiently. For
natural gas fuel, there are 1015 BTU/ft
160 hp x 10,000 BTU/Hr per hp = 1,600,000 BTU's / per hour for proper operation
1,600,000
= 1576 cubic feet per hour
1, 015
Note: The incoming pressure must be approximately 20 psi to unit.
35319 C
FUEL SELECT SWITCH
AUTO
NG
LP
00651
Figure 9 - Fuel Select Switch
3
. From Table 1, a 60 foot run requires a minimum 1 inch pipe at full engine load.
MGG155/210 Operating Manual
General Information
15