ORION TELESCOPES & BINOCULARS 7818 User manual

Orion Three Fan
Cooling System for SkyQuest™
XX14g GoTo Dobsonian
#7818
INSTRUCTION MANUAL
Providing Exceptional Consumer Optical Products Since 1975
OrionTelescopes.com
Customer Support [phone]
E-mail: suppor[email protected]
Corporate Offices [phone]
89 Hangar Way, Watsonville, CA 95076
© 2011 Orion Telescopes & Binoculars
IN 408 Rev. A 04/11

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The Orion Three Fan Cooling System is designed to work with
the Orion SkyQuest XX14g Dobsonian telescope. The cooling
fans significantly reduce the time it takes for the primary mirror
to equilibrate to the outdoor ambient temperature. This results in
steady, crisp images in a shorter amount of time. The fans, which
are powered by 12 volts DC, run quietly and with no vibration
imparted to the telescope. These instructions will tell you how
to install and use the cooling fans. Please read them thoroughly
before beginning the installation.
Parts List
3 Fans
3 Wire fan covers
1 Battery pack
12 Screws
12 Washers
1 Power cable splitter
Assembly
1. Place each fan on the rear of the primary mirror support cell and line up the
holes in the corners of the fans with the threaded holes in the mirror cell.
Make certain the label on each fan is facing the primary mirror. Also make
sure that the power input jack on each fan is facing the center of the mirror
cell (Figure 1).
2. Place a wire fan cover over each fan so the mounting holes line up with the
holes in the fan. Each fan cover should be oriented so that its corners seat
flush on the fan.
3. Insert a screw, with a washer attached, through the fan cover and fan
(Figure 2), and thread it into the mirror cell with a Phillips screwdriver.
Firmly tighten the screw, but be careful not to overtighten and strip the
threads. Repeat this for the other three screws (and washers). Mount all
three fans.
4. Insert eight D-cell batteries (not included) into the battery pack. Orient the
batteries as shown on the plastic battery holder.
Figure 1. Orient the fans as shown, with fan labels facing down and power input jacks
facing the center of the mirror support cell.
Figure 2. Place a washer on each mounting screw, then insert the screw through the
wire cover and fan and into the threaded hole in the metal support cell. Tighten all four
screws to secure each fan in place.
Power
input
jacks

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fans on again for a period of time until the ambient temperature stabilizes and
the mirror has had a chance to equilibrate. Then resume observing. Generally,
though, once the mirror has cooled to the ambient temperature initially, the fans
will not be needed again until your next observing session.
Eight D-cell batteries will provide a run time of at least 24 hours.
You should not have to remove the fans once they are installed.
CAUTION: When installed, the fans do not protrude below the rear end ring of
the telescope. However, if you stand the optical tube upright on the ground dur-
ing assembly or disassembly of the telescope, be sure the surface is flat. If it
isn’t, one or more of the fans could contact the ground and bear the weight of
the telescope, which could damage the fan(s) and the mirror support cell.
Specifications
Fan type 12-volt DC brushless, 0.12A, 80mm, 2500 RPM (x3)
Fan output 33.4 cubic feet per minute (CFM) airflow
Power 12-volt DC; battery holder for 8 D-cells included
(batteries not included)
Power cable 35" power splitter cable with three 5.5mm OD coaxial
plugs, 2.1mm tip dia.
Fan covers Protective wire “grille” covers
Hardware 12 mounting screws (Phillips head) and washers
included
5. Plug one of the three male ends of the power cable splitter into the jack on
each fan. We recommend running the power cable splitter under the mirror
cell structure then bringing the cable ends back out and into the fan jacks, to
keep the cables out of the way as much as possible (Figure 3).
6. Now connect the plug from the battery pack to the female jack on the power
cable splitter. The fans should now begin rotating. If they do not, check the
connections of each fan and the orientation of the batteries and try again. To
turn the fans off, unplug the power cable splitter from the battery pack.
The fans can also be powered by a 12-volt DC field battery, such as the Orion
Dynamo Pro Power Station.
Using the Cooling Fans
The cooling fans should be turned on as soon as the telescope is brought out-
doors before observing. They should run for approximately 20-30 minutes to
properly cool down the large primary mirror. The fans should be turned off while
you’re observing. This is because even though they run free from vibration, the
air currents they generate in the optical tube could degrade image quality. If the
temperature changes rapidly during your observing session, you could turn the
Figure 3. Fans are shown properly installed, with the power cable running under the
mirror support cell to keep it out of the way.

One-Year Limited Warranty
This Orion Three Fan Cooling System for SkyQuest XX14g GoTo Dobsonian is war-
ranted against defects in materials or workmanship for a period of one year from the
date of purchase. This warranty is for the benefit of the original retail purchaser only.
During this warranty period Orion Telescopes & Binoculars will repair or replace, at
Orion’s option, any warranted instrument that proves to be defective, provided it is
returned postage paid to: Orion Warranty Repair, 89 Hangar Way, Watsonville, CA
95076. If the product is not registered, proof of purchase (such as a copy of the
original invoice) is required.
This warranty does not apply if, in Orion’s judgment, the instrument has been
abused, mishandled, or modified, nor does it apply to normal wear and tear. This
warranty gives you specific legal rights, and you may also have other rights, which
vary from state to state. For further warranty service information, contact: Customer
Service Department, Orion Telescopes & Binoculars, 89 Hangar Way, Watsonville,
CA 95076; [phone].
OrionTelescopes.com
89 Hangar Way, Watsonville, CA 95076
Customer Support Help Line [phone]
© 2011 Orion Telescopes & Binoculars