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3
Fig 7
Alternately tighten the screws using a cross pattern as shown.
The simplest way to use the dew heater ring is to connect a 12V
DC power supply to the ring’s power jack.
1. Remove the power jack from its storage clip on the ring and
place the jack into the included cable management clip
(Figure 9).
STAND-ALONE OPERATION
Fig 10
Fig 9
2. Attach the cable management clip to the front cell of the telescope
near where the jack connects to the heater ring (Figure 10). When
doing this, avoid pulling on the jack’s cable, which puts strain on
its connection to the heating circuit, and with enough force could
cause cable damage. The cable management clip holds the
jack securely to the front cell of the optical tube in a convenient
position and prevents pulls on the jack’s cable when in use.
3. Now, just plug your 12V DC power source (5.5mm/2.1mm barrel
plug, tip positive) into the heater ring’s power jack, and the ring
will begin to heat up.
When used in this “stand-alone” operation, the heater ring’s
thermistor is not used, and the ring always operates at full power.
This provides the highest level of dew prevention but is not the
most effi cient use of power to keep the optics clear.
8. Remove the paper installation shield. Installation is now complete.
When the dew heater ring is not in use, the power jack and
thermistor jack stay clipped to their plastic storage clips which are
connected to the ring itself (Figure 8). When in their storage clips,
the telescope’s dust cover can be placed on the front of the tube
without interference from the jacks.
Make sure your 12V DC power source can deliver at least the
maximum amount of current draw, otherwise the ring may not heat
up enough to prevent dew from forming on the corrector during
heavy dew conditions.
When you are done for the night:
1. Unplug the power source from the ring’s power jack.
2. Remove the power jack from the cable management clip and
place the jack into its storage clip on the dew heater ring.
3. Remove the cable management clip from the telescope. We
recommend storing this clip in your eyepiece or equipment case.
4. Now place the telescope’s dust cover on the front of the
optical tube.
Dew Heater Ring
Max Current Draw
5”
0.6 A
6”
1.0 A
8”
1.7 A
9.25”
2.0 A
11”
2.5 A
14”
4.4 A
Fig 8
Power Jack Storage Clip
Storage Clip
Thermistor Jack
At full power, the dew heater rings draw the following amount
of current:
