Shindaiwa DGK150DU Owner's Manual page 21

Voltage Regulator / Engine Speed Switch
(1) Voltage Regulator
The dial adjusts generator output voltage.
Turn the dial clockwise to increase, or counter-clockwise to decrease
the voltage.
(2) Engine Speed Switch
Throttle Switch
Set the toggle switch to "START" position for warm-up or cool-down the
engine, and set to "RUN" position during rated operation.
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