Specifications

Page 5
Basic Auto operation
In this mode the front panel Power switch is set to the Auto position, the Trigger Mode switch is set
to the 12VDC position, and nothing is plugged into the Trigger In connector.
The C-12 is controlled by the temperature at the temperature sensor. (If the remote sensor is
attached, then this is the temperature at that location; if no remote sensor is attached, then it is the
temperature at the bottom panel of the C-12 unit. When the remote sensor is attached, the internal
sensor is disabled and ignored.) When the temperature at the sensor reaches the value set by
the Fan Auto-On Temperature knob, the fans will start at slow speed. If the temperature continues
to rise, the fans will speed up until they reach maximum speed. (The end result is that the fans
will run just fast enough to keep your cabinet at or slightly above the set temperature. When the
temperature is below the set temperature, the fans will not run.)
Triggered Auto operation
In this mode the front panel Power switch is set to the Auto position, the Trigger Mode switch is set
to the 12VDC position, and a trigger cable (from some other device) is plugged into the Trigger In
connector.
Note: The Trigger In connector on the C-12 is a switched connector. If you plug a cable into
the Trigger In connector and don’t connect it to anything, the C-12 will NOT operate in Auto
mode at all.
When the trigger input is high (+12 VDC), the C-12 operates exactly as it does in Basic Auto mode
(the fans start running when the temperature at the sensor exceeds the threshold temperature
set by the Fan Auto-On Temperature control). When the trigger input is low, the C-12 fans do not
operate.
Sync mode
Sync mode allows the operation of multiple C-12 units to be controlled by a single “master unit”.
One unit is designated as the “master” and a second (or more) units as “slaves”. The fans in all
slave units will switch on at the same time and run at the same speed as those in the master unit. All
activity will be controlled by the temperature sensor and temperature threshold setting of the master
unit. (All sensors in slave units will be ignored.)
In this mode, the front panel Power switches in all master and slave units are set to the Auto
position, and the Trigger Mode switches are set to the Sync position. A trigger cable is connected
from the Trigger Out of the master unit to the Trigger In of the slave (or rst slave). If there are
additional slave units, then a trigger cable is connected from the Trigger Out of the rst slave to the
Trigger In of the second slave, and so on; this is repeated until all slaves are connected. (All slaves
must be set to Auto and to Sync mode).
Note: In Sync mode there should NOT be anything plugged into the Trigger In connector of
the master unit.
In this mode, ALL C-12 units are controlled by the temperature at the temperature sensor of the
master unit. (If the remote sensor is attached, then this is the temperature at that location; if no
remote sensor is attached, then it is the temperature at the bottom panel of the C-12 unit.) When the
temperature at the sensor reaches the value set by the Fan Auto-On Temperature knob, the fans
will start at slow speed. If the temperature continues to rise, the fans will speed up until they reach
maximum speed.