Specifications
Page 4
Installation and Conguration
How the Sherbourn C-12 operates is determined both by switch settings and by mechanical
reconguration of parts of the device. Read and follow the instructions carefully. Improper or
incomplete conguration may result in unusual or unexpected behavior.
In general, the electrical conguration and switch settings determine when and if the C-12 fans will
operate (and at what speed), while the mechanical conguration determines the direction of air ow
through the unit when the fans are active.
Note: The Trigger In connector on the C-12 is a switched connector. Connecting a cable to
this input operates a switch inside the C-12, so plugging in a cable that is not connected
to an appropriate device at the other end may result in improper operation of the C-12. The
Trigger In connection also serves different purposes depending on how the Trigger Mode
switch is set.
Note: The Trigger Out connector carries different signal levels depending on how the Trigger
Mode switch is set. Specically, when the Trigger Mode switch is in the Sync position, the
Trigger Out should NOT be used to trigger “ordinary” 12 V triggered devices.
Front panel Power Switch (On/Auto; on the left side of the front panel)
This is a mechanical push button switch, which toggles between settings each time it is pressed, so
it retains its setting when the C-12 is powered off.
When the front panel switch is in the On position (in), the C-12 fans will run at full speed whenever
mains power is applied to the C-12, regardless of the temperature or other settings or connections.
When the front panel switch is in the Auto position (out), the operation of the C-12 is controlled by
the Trigger Mode switch, trigger connections, and temperature sensors.
Front panel LED (blue)
The front panel LED is located just above the front panel Power switch. This LED will light blue when
power is applied to the fans (it is not a “power LED” and will not be lit if mains power is present, but
the C-12 fans are off because their temperature trigger threshold has not been exceeded).
Fan Auto-On Temperature (knob on rear panel)
This knob sets the temperature at which the C-12 fans switch on when in Auto mode. The
temperature range is from approximately 90 degrees to 104 degrees Fahrenheit
(about 32 to 40 degrees Celsius). The C-12’s fans will start running at a slow speed (and very
quietly) when this temperature is exceeded, and will run faster as the temperature increases. Once
the temperature exceeds this threshold by about fteen degrees, the fans will be running at full
speed and maximum air ow capacity. The fans will run only as fast as needed to maintain the
desired temperature.
Temperature Sensor connector (1/8” jack on rear panel)
The C-12 has an internal temperature sensor mounted on the bottom of the chassis. The
Temperature Sensor jack on the rear panel allows for connection of an optional magnetically
mounted remote sensor. When the external sensor is plugged in, the internal sensor is completely
overridden. To ensure proper operation, use only the appropriate Sherbourn supplied external
sensor.