14 en | General installation procedures Power amplifier
2023-01 | V02 | F.01U.402.247
Installation manual
Bosch Security Systems B.V.
– Allow for an air duct of at least 60mm between the rear panel of the power amplifier and
the inner wall of the cabinet/rack case.
– Make sure that the duct reaches up to the cabinets or the rack case's top ventilation
louvers.
– Leave room of at least 100mm above the cabinet/rack case for ventilation. Since
temperatures inside of the cabinet/rack case can easily rise up to 40°C during operation
of the power amp, it is mandatory to bear in mind the maximum allowable ambient
temperature for all other appliances installed in the same cabinet/rack case.
For fixed amplifier installations in a device control room that incorporate a central air‑cooling
system or air conditioners, calculating the maximum heat emission may be necessary. See also
Mains operation and resulting temperature, page 15
.
4.5 Fan cooling
The device is designed for desktop operation without the need to run the fan, using
convection cooling. This ensures silent running in most conditions.
The temperature of the power amp's channels are supervised and monitored, as well as the
power supply and control unit section. These parameters determine the fan activation to
prevent output limiting from occurring.
The fan has two optimized performance levels for low and high and use the same criteria to
determine the appropriate level of force cooling required.
The rotation of the fan is supervised. In case of a lock condition where the fan is not rotating,
this is indicated with flashing warning LEDs on the front panel and the Fault relay. However,
even in such a condition the amplifier will operate without switch‑off or reduction if
supervised and monitored levels are within the range of silent running parameters.
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