NEC LT170 LT170 user's manual - Page 11

INSTALLATION AND CONNECTIONS Throw Distance and Screen Size The following shows the proper relative positions of the projector and screen. Refer to the table to determine the position of installation. Distance Chart Screen Width Screen Height Screen Diagonal Screen center (B) B = Vertical distance between lens center and screen center C = Throw distance D = Vertical distance between lens center and top of screen (bottom of screen for desktop) α = Throw angle NOTE: Distances may vary +/-5%. (D) Screen Bottom Lens Center Throw Angle (α) Throw Distance (C) Screen Size Diagonal Width inch inch 30 24 40 32 60 48 67 54 72 58 80 64 84 67 90 72 100 80 120 96 150 120 180 144 200 160 Height inch 18 24 36 40 43 48 50 54 60 72 90 108 120 B C D α Wide - Tele Wide - Tele inch inch inch 7 42 - 47 2 10 57 - 63 2 14 86 - 95 4 16 96 - 106 4 17 104 - 114 4 19 115 - 127 5 20 121 - 133 5 22 130 - 143 5 24 145 - 159 6 29 174 - 191 7 36 218 - 240 9 43 262 - 288 11 48 291 - 320 12 degree 9.7 - 8.7 9.5 - 8.7 9.5 - 8.6 9.5 - 8.6 9.4 - 8.6 9.4 - 8.6 9.4 - 8.6 9.4 - 8.6 9.4 - 8.6 9.4 - 8.6 9.4 - 8.5 9.4 - 8.5 9.4 - 8.5 Screen Size Diagonal Width mm 762 1016 1524 1702 1829 2032 2134 2286 2540 3048 3810 4572 5080 mm 610 813 1219 1361 1463 1626 1707 1829 2032 2438 3048 3658 4064 Height mm 457 610 914 1021 1097 1219 1280 1372 1524 1829 2286 2743 3048 B mm 183 244 366 408 439 487 512 548 609 731 914 1097 1219 C Wide - Tele mm 1070 - 1190 1450 - 1590 2190 - 2410 2450 - 2700 2640 - 2900 2930 - 3230 3080 - 3390 3300 - 3640 3680 - 4050 4420 - 4860 5530 - 6090 6650 - 7310 7390 - 8130 D α Wide - Tele mm degree 46 9.7 - 8.7 61 9.5 - 8.7 92 9.5 - 8.6 102 9.5 - 8.6 110 9.4 - 8.6 122 9.4 - 8.6 128 9.4 - 8.6 137 9.4 - 8.6 153 9.4 - 8.6 183 9.4 - 8.6 229 9.4 - 8.5 275 9.4 - 8.5 305 9.4 - 8.5 WARNING * Installing your projector on the ceiling must be done by a quali- fied 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 injured and the projector severely damaged. • Do not use the projector where temperatures vary greatly. The projector must be used at temperatures 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. 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 button and SELECT dial on your projector cabinet or the MENU and the ̆̄̇̈ buttons on your remote control to correct the orientation. (See page E33.) E-11