Dell 2200MP Safety Instructions page 24

Power Saving
Use this function to select the power saving delay period. Press "Yes" to go into the "set
time" sub menu.
Set Time(Min)
Set the power saving delay period as you prefer. When the projector is not receiving an
input signal for the selected period of time, the projector will automatically enter power
saving mode, and turn off the lamp. After a one-minute cooling period, the projector will
turn back on with detection of an input signal or by pressing the "Power" button. After
two hours the projector will turn off and must be turned on by pressing the power
button on the control panel or remote.
Auto Source
The projector will always automatically search for available input signals when Auto
Source is On, which is the default setting. Press the "Source" button with Auto Source
On to automatically search for the next available input signal. Selecting Off will lock on
the current input source. Set Auto-Source to Off to step through the different input
signals manually.
ECO Mode
Use this function to dim the projector lamp light output which will lower power
consumption and increase lamp life. Selecting "On" will dim the projector lamp; selecting
"Off" will return the lamp to high brightness mode.
High Altitude