NEC LT158 - Manual (Page 21)

E – 17
Ceiling Installation
Screen Top
1.6” (40.3mm)
Lens Center
Screen Center
Screen Bottom
Throw Distance (C)
Throw Angle ( α)
Projector Foot
D
B
WARNING
• Installing your 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.
• Only use your projector on a solid, level surface.
If the projector falls to the ground, you can be in-
jured and the projector severely damaged.
• Do not use the projector where temperatures vary
greatly. The projector must be used at tempera-
tures between 41˚F (5˚C) and 95˚F (35˚C).
• Do not expose the projector to moisture, dust, or
smoke. This will harm the screen image.
• Ensure that you have adequate ventilation around
your projector so heat can dissipate. Do not cover
the vents on the side or the front of the projector.
If your projector is mounted on the ceiling and your image is upside down, use the “Menu” and “Select” buttons on your projector cabinet or ▲▼
button on your remote control to correct the orientation. (See page E-37.)
Reflecting the Image
Using a mirror to reflect your projector’s image enables you to enjoy a much larger image. Contact your NEC dealer if you need a mirror. If you’re
using a mirror and your image is inverted, use the “Menu” and “Select” buttons on your projector cabinet or
▲▼ buttons on your remote control to
correct the orientation. (See page E-37.)
Distance Chart
B=Vertical distance between lens center and
screen center
C=Throw distance
D=Vertical distance between lens center and
screen bottom (screen top for ceiling installa-
tion)
Throw Angle ( α)
Throw Distance (C)
1.6” (40.3mm)
Lens Center
Screen Top
Screen Center
Screen Bottom
D
B
Projector Foot
Screen Size B C D α
Diagonal Width Height wide tele wide tele
inch mm inch mm inch mm inch mm inch mm - inch mm inch mm degree - degree
25 635 20 508 15 381 6 152 - - - 46 1166 -2 -39 - - 7.4
30 762 24 610 18 457 7 182 46 1165 - 56 1413 -2 -47 8.9 - 7.3
40 1016 32 813 24 610 10 243 62 1576 - 75 1906 -2 -62 8.8 - 7.3
60 1524 48 1219 36 914 14 364 94 2398 - 114 2891 -4 -93 8.6 - 7.2
67 1702 54 1361 40 1021 16 406 106 2685 - 127 3236 -4 -104 8.6 - 7.2
72 1829 58 1463 43 1097 17 437 114 2890 - 137 3482 -4 -112 8.6 - 7.1
80 2032 64 1626 48 1219 19 485 127 3219 - 153 3877 -5 -124 8.6 - 7.1
84 2134 67 1707 50 1280 20 509 133 3383 - 160 4074 -5 -131 8.6 - 7.1
90 2286 72 1829 54 1372 21 546 143 3630 - 172 4369 -6 -140 8.6 - 7.1
100 2540 80 2032 60 1524 24 607 159 4040 - 191 4862 -6 -155 8.5 - 7.1
120 3048 96 2438 72 1829 29 728 191 4862 - 230 5848 -7 -187 8.5 - 7.1
150 3810 120 3048 90 2286 36 910 240 6094 - 288 7326 -9 -233 8.5 - 7.1
180 4572 144 3658 108 2743 43 1092 288 7326 - 347 8804 -11 -280 8.5 - 7.1
200 5080 160 4064 120 3048 48 1213 321 8148 - 385 9790 -12 -311 8.5 - 7.1
210 5334 168 4267 126 3200 50 1274 337 8558 - 405 10283 -13 -327 8.5 - 7.1
240 6096 192 4877 144 3658 57 1456 385 9790 - 463 11761 -15 -373 8.5 - 7.1
261 6629 209 5304 157 3978 62 1577 418 10612 - 502 12746 -16 -404 8.5 - 7.1
270 6858 216 5486 162 4115 64 1638 434 11023 - - - -17 -420 8.5 - -
300 7620 240 6096 180 4572 72 1820 482 12255 - - - -18 -466 8.4 - -
NOTE: Distances may vary +/–5%.