Lunatico ZeroDew Guide

Using the humidity control system
“ZeroDew”
ZeroDew is a product designed and manufactured by Lunático
Astronomía in order to offer a reliable and accessible solution to
the condensation problems suffered by telescopes and optical
elements in general of the amateur astronomer.
Elements:
A ZeroDew system consists of a digital controller and one or more heating bands. The
controller can be 1(1) directly connected to batteries or to a power source of the car lighter
type. The bands must be connected exclusively to the controllers by means of the 4 outlets
provided for such purpose.
Use:
1. Place the band or bands in the telescope (or finder, ocular..) in such a way that the
rugged part of the band remains towards the outside and the cable in the direction
where the controller is to be installed. Try to place the band as close as possible of
the element that is intended to protect from the humidity (correcting sheet, objective
of the refractor……) See Photo.
2. Firmly fix it with the Velcro.
3. Connect the band or bands to the controller.
4. At last, connect the controller to the power
source.
5. The outlet is adjusted by means of the
potentiometer; it is convenient to reach the
lower position where the humidity is avoided,
in order to minimize the consumption of
batteries and to avoid excessive heating.
The controller has a system of protection against the discharge of the batteries; in the case
when the outlet voltage of the battery reaches a minimum value, a red indicator shall light
and outlet power shall cease to be supplied. That shall avoid that the battery suffer
irreparable damage.
1 Depending on the version

Failures and repairs:
If, for any reason, the ZeroDew controller ceases to work, first of all check the connections
and the charge of the batteries, also check if any fuse is blown (there is one of 10A within the
controller, and in the version for car lighter there is another one within the adapter –there is
only necessary to unscrew the “nose” of the adapter for acceding, it is not necessary to use
tools – the last is of 3A).
Safety warnings:
•The system must be exclusively connected to power sources or batteries of 12V.
•The bands must be placed in the telescope, ocular, etc, before supplying power.
Particularly the resistors must never be heated while being wrapped on themselves.
•The fuses must be replaced by equal ones.
Revisión 3.0 Jul 19 th 2007 Lunático Astronomía www.lunatico.es