Mounting; Cooling And Ventilation; Powering; Maintenance - Crest Audio LT Series Owner's Manual

cooling and ventilation

LT / ST amplifiers use a forced air cooling system to maintain a low,even operating tem-
perature.
Air is drawn in by a DC fan on the rear panel, flows through the cooling fins and then
exhausts through the front panel vent.
Heat sink temperature is monitored and controls the variable speed fan. Fan speed
increases only as required, keeping fan noise to a minimum.
If the heat sink surpasses its maximum allowed temperature, the thermal protection
circuit will activate and open the output relays allowing the amplifier to cool to a safe
temperature. To continue using the amp, it must be reset by turning the power off and
then turning it back on again.
Thermal protect activation only occurs under extreme thermal conditions and is not
part of normal operation.

powering

Unless otherwise specified when ordered, LT / ST amplifiers are supplied factory set
to following voltage options :
Option 1
US domestic
(safe operating range 100 - 132Vac )
Option 2
export models
note
Due to the nature of the switching power supply in the ST, 50 - 60Hz operation is acceptable for both
options.

maintenance

LT / ST amplifiers require no routine maintenance.
If the amplifier is used in an extremely dusty or smoky environment , the unit should
be periodically blown free ( using compressed air ) of any foreign matter that may have
built up inside the unit.
Users will not need to make any adjustments to the amplifier during its lifetime.There
are no user-serviceable parts or adjustments that require opening the amplifier.
nominal 120Vac 60Hz for rated power output
nominal 230Vac 50Hz for rated power output
(safe operating range 200 - 264Vac )
installation
Make certain that there
is enough space around
the front and rear of the
amplifier to allow the
heated air to escape.
When mounting in a rack,
try to avoid using doors
or covers on the front
and rear of the enclosure;
the exhaust air must not
be impeded
suggestion
In racks with closed backs
allow at least one stan-
dard-rack-space opening
for every four amps.
2
a
p. 7