Runco LS-3 Series Installation & Operation Manual page 82

Operation
To turn test patterns off, press any key other than or on the remote control unit or
built-in keypad.
Altitude: Select Altitude from the Service Menu to control the operation of the projector's
cooling fan.
In most cases, the default setting (Auto) will maintain the correct operating temperature. If
the lamp frequently turns off due to overheating, or in certain high-altitude operating
environments, you may need to change this setting to High.
66 Runco LS-3/LS-5 Installation/Operation Manual