NEC MT830 - Manual (Page 19)

E-18
WARNING
• Only use your LCD projector on a solid, level surface. If the projector falls to the ground, you can be injured and the projector severely damaged.
• Do not use the LCD projector where temperatures vary greatly. The projector must be used at temperatures between 0˚C and 40˚C.
• Do not expose the LCD projector to moisture, dust, or smoke. This will harm the screen image.
• Ensure that you have adequate ventilation around your LCD projector so heat can dissipate. Do not cover the vents on the side or
the front of the projector.
Ceiling Installation
Installing your MultiSync MT830/1030 LCD Projector on the ceiling must be done by a qualified technician. Contact your NEC
dealer for more information.
Do not attempt to install the projector yourself.
NOTE : Distances may vary
±
5%.
A
C
B
F
α
Formulas (mm)
H inch = Horizontal Screen Width
M = 1.25H / 33.02 (Projection magnification)
A = C / cos
α
B = 85.2 + 8M
C (WIDE) = 53.2
ןM – 85.609
C (TELE) = C (WIDE)
ן1.3055
F = {(3H / 8) – (85.2 + 8M)}
= 1.906M – 85.2
A : Distance between the lens and the screen center
B : Vertical distance between the top of the optional ceiling mount and the screen center
C : Horizontal throw distance between the screen surface and the lens
F : Vertical distance between the projector bottom and the top of image