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PowerH SERIES
Owner’s Manual 13
2.5 Ventilation
As with all Dynacord power amps with fan
cooling, the airflow direction is front-to-rear,
obviously because there is more cold air
outside of the rack case than inside. The power
amplifier remains cooler and dissipating the
developing waste heat in a specific direction
gets easier. In general, setting up or mounting
the power amplifier has to be done in a way that
fresh air can enter unhindered at the front and
exhausted air can exit at the rear. When
installing the power amp in a case or rack
system, attention should be paid to these details
to provide sufficient ventilation. Allow for an air duct of at least 60 mm x 330 mm 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
cabinet’s or the rack case’s top ventilation louvers. Leave room of at least 100 mm 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. Please also take notice of the
information on page 10.
2.6 Groundlift
The ground lift switch allows eliminating noise loops. When operating the power amplifier together with
other equipment in a rack case, setting the switch to the GROUNDED position is recommended. Set the
switch to UNGROUNDED, when the power amplifier is operated together with appliances with differing
ground potentials.
CAUTION:
Blocking/closing the power amp’s ventilation louvers is not permissible. Without
sufficient cooling/ventilation, the power amplifier may automatically enter protect
mode. Keep ventilation louvers free from dust to ensure unhindered airflow.
CAUTION:
Do not use the power amplifier near heat sources, like heater blowers, stoves or any
other heat radiating devices.
CAUTION:
To ensure trouble-free operation, make certain that the maximum allowable ambient tem-
perature of +40 °C is not exceeded.
Illustration 2.6: H2500/H5000 Ventilation