Generac Power Systems Magnum MGG100M, Operator'S Manual

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Operation
34 MGG100M Operating Manual 36833 C
OPERATING UNIT
Before attempting to operate the unit, verify the unit is properly set up. See Setting Up Unit for more information.
Purging Air from Fuel Line
Before the unit will run on NG, air must be purged from the primary fuel line and the NG pressure in the fuel system
must be at or above 30 PSI (207 kPa). To accomplish that, both fuel sources must be connected to the unit during
start-up. The procedure is as follows.
1. Verify both fuel sources are connected to the unit.
2. Verify valves are open on both fuel sources.
3. Turn the key switch to MAN. The unit starts and begins running on LPL. Simultaneously, NG is drawn from the
pumpjack into the NG fuel system. When the pumpjack delivers NG to the fuel system at or above 30 PSI (207
kPa), the unit switches to the NG fuel source. See
Fuel System for more information.
Starting Unit
The intended use is MANUAL mode (key-switch position MAN). See Equipment Description for more information.
MANUAL Mode
1. Turn key switch to MAN. The unit starts. The controller display activates and the NOT IN AUTO light begins pulsing.
Note: The NOT IN AUTO light always pulses when the unit is running in manual mode.
2. Perform operation inspection. See Operation Inspection for more information.
3. Turn key switch to OFF and allow unit to completely stop.
4. Connect electrical loads to unit. See
Generator Output Connections for more information.
5. Repeat step 1 and begin using connected loads.
AUTO Mode
If unit is correctly connected to a transfer switch, the start-up procedure is as follows.
1. Turn key switch to AUTO. The unit does not start.
2. When transfer switch is tripped, the unit starts.
CAUTION
If unit is connected to a transfer switch, the unit must only be used in AUTO mode, to deflect
the load upon start up.
See General Information for more information on the key switch.