A
system configured to provide cooling of
electronic equipment in a shelter in combination with an
air conditioning (A / C)
system. The
system includes one or more blowers for drawing air into the shelter, a
damper arrangement for controlling air exhaust. The system further includes a DC powered controller coupled to the one or more blowers, the
damper arrangement, and the A / C system. The controller is configured to receive at least a first analog input
signal associated with a shelter-interior temperature, a second analog input
signal associated with a shelter-exterior temperature, and a plurality of alarm input signals and to generate the one or more first control signals to control blower rotational speed, the second
control signal to open / close the
damper arrangement, and a third
control signal to inhibit / activate the A / C system based on at least the first analog input
signal, or the second analog input signal, or a plurality of alarm input signals, or a combination of these.