Owner's Manual

25570 Rye Canyon Rd. Valencia, California 91355
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[e-mail] www.activethermal.com
Cut a 4 ½” center hole and drill 4 mounting holes for each of the fans per the drawing on page 4.
The fans can be mounted either on the inside or outside surface of the enclosure; air moves
towards the label side of the fan. If there is any possibility of contact with the fan blades when the
system is in use, install the guards supplied to prevent personal injury.
When locating the fans, remember that provision must be made to allow room air to enter the
enclosure to replace the hot air being exhausted. Intake locations low in the enclosure are
generally preferred; the optimum arrangement is that in which air enters and passes by the heat-
generating equipment on its way to the exhaust fans. Avoid locating the inlet too close to the
exhaust fans as room air may enter and be immediately exhausted without cooling the enclosure
and equipment.
An air inlet improperly located or too small will prevent the System 2 or 2 + 2 from operating
efficiently and quietly.
2. Mount the control unit at a convenient location. Plug the 2 or 4 fan wires into the connectors on
it. (Any fan can be plugged into any fan connector.)
3. The thermal probe controls the operation of the fans. Locate it where it can sense system heat;
usually on top of the hottest component. Hold it in place with the supplied ty-wrap and anchor.
Plug the thermal probe into connector TH1.
4. The System 2 or 2 + 2 is powered by a wall-type power supply. Do not plug it into a switched
outlet; use an AC outlet which is always on to allow the fans to run after the other equipment has
been turned off. If possible, use an outlet on the same circuit that powers the equipment
producing the most heat. If this circuit should fail, the ventilation will cease, but the heat
source(s) will also turn off. If the System 2 or 2 + 2 is powered from a different circuit, it is
possible that the cooling circuit could lose power while the equipment in the enclosure continued
to produce heat.
Operational test:
Plug the power supply into a live outlet. Plug the power supply output lead into the female
connector attached to the control box. The green LED will light to indicate that power is present.
As the temperature at the thermal sensor rises past approximately 85 degrees (F), the fans will
begin to turn at a moderate speed and the yellow led will light. Fan speed will increase if the
temperature increases 5 degrees. A red LED will then indicate that the fans are turning at full
speed.
When the enclosure temperature falls, the fans will slow down, stopping when the temperature
falls below approximately 85 degrees Fahrenheit.
• Please note: It is common for the fans to remain on continuously in low speed, due to
the heat given off by satellite receivers, cable boxes, and PVRs, even when these
devices are not in use.