34 Installation TB9100/P25 CG Installation and Operation Manual© Tait Electronics Limited January 2007Equipment VentilationAlways ensure there is adequate ventilation around the TB9100 base station.Warning!! Do not operate it in a sealed cabinet. You mustkeep the ambient temperature within thespecified range, and we strongly recommendedthat you ensure that the cooling airflow is notrestricted.Important The cooling fans are mounted on the front panel and willonly operate when the panel is fitted correctly to the frontof the subrack. To ensure adequate airflow through the basestation, do not operate it for more than a few minutes withthe front panel removed (e.g. for servicing purposes).Ambient Air Temperature SensorThe ambient air temperature readingfor the TB9100 base station isprovided by the ambient airtemperature sensor board b fitted tothe PA control board.The sensor board is inserted throughslots in the control board and heatsinkto be positioned between the heatsinkfins.Important If the sensor board is to provide accurate ambienttemperature readings, it must have forced airflow and mustnot come into contact with the metal of the heatsink fins.Do not stack PAs with the fins together. It is possiblefor the fins on one heatsink to slide between the fins on theother heatsink. This can damage the sensor board, andpossibly result in the heatsink fins becoming lockedtogether.Cabinet and Rack VentilationThe cooling airflow for the TB9100 base station enters through the frontpanel and exits at the rear of the subrack. For optimum thermalperformance, the heated air that has passed through a base station must notbe allowed to re-enter the air intakes on the front panel. Any space at theb
