8
C Series Operation Manual
5.1 unpacking
Carefully open the shipping carton and check for any
noticeable damage. Every Lab.gruppen amplifier is
tested and inspected before leaving the factory and
should arrive in perfect condition. If any damage
is discovered, please notify the shipping company
immediately. Only the consignee may institute a
claim with the carrier for damage incurred during
shipping. Save the carton and packing materials for
the carrier’s inspection. Should you ever need to
ship the amplifier, always use the original packaging
materials.
5. Mounting
The amplifier is two rack units high (2U) and will fit
into a standard EIA 19” rack.
The depth is 343 mm (13.5”).
The weight is approximately 12 kg (26.4 lbs.) depen-
ding on model type.
Free airflow from front to rear of the amplifier must
be possible. Therefore, no doors or rack-lids should
be mounted in front of or behind the amplifiers.
Amplifiers may be stacked directly on top of each
other. There is no need for spacing in between units,
though this might enable more convenient installation
of cabling on the rear-panel.
It is recommended that rear supports be mounted
for maximum long-term stability.
5.3 Cooling
The amplifier uses a forced-air cooling system
with air flow from front to rear, maintaining a low
operating temperature within defined limits. Front-to-
rear airflow is preferred as cooler air is present at the
front in nearly all installed applications. (This allows
higher continuous power levels without encountering
thermal problems.) Never attempt to reverse the
airflow. The amplifier modules require a pressure
chamber between the fans and heatsink, and this
effect functions only in one direction.
Make sure that there is an adequate air supply in front
of the amplifier, and that the rear of the amplifier has
sufficient space to allow the exhaust to escape. If
the amplifier is rack-mounted, do not use covers or
doors on the front or rear of the rack.
Should a heat sink overheat, the temperature
sensing circuits will mute the overheating channel.
If the power supply overheats, another sensing
circuit will mute all output channels until the power
supply cools to safe operating temperature. An early
warning before shut down will be indicated on the
front panel LEDs, and a warning will be sent through
the NomadLink network.
Always make sure that the dust-filters behind the
detachable front panel are clean to ensure maximum
possible airflow.
If the amplifier malfunctions due to dirty
dust filters, any required repairs are not
covered by the warranty.
To calculate the maximum heat emission value, when
installing the amplifiers in rooms with an air-conditio-
ning system, please refer to the BTU specifications
provided in the Appendix section.
5.4 Operating voltage
The label placed to the right of the mains
cable on the rear of the amplifier indicates the
AC mains voltage for which the amplifier is wired
and approved: 115 V or 230 V. Connect the power
cable only to the AC source type referred to on the
label. The warranty will not cover damage caused by
connecting to an incorrect type of AC mains.
Lab.gruppen switch mode amplifiers use primary
switching. Because the mains power is rectified
directly in front of the transformer, the amplifier is
insensitive to mains frequency. It may be connected
to 50 or 60Hz sources, and actually will operate on
line frequencies from DC to 400 Hz.
If the power plug mounted at the factory is not
appropriate for your country, it can be removed and
the proper connector wired in its place as follows.
BLACK or BROWN
LIVE
WHITE or BLUE
NEUTRAL
GREEN or GREEN/YELLOW EARTH(GROUND)
Warning: If you are not 100% confident of your
competence to replace the mains plug, engage
qualified personnel to do the job.
Once a suitable AC supply is connected, the
5 INsTALLATION
Summary of Contents for C 68:4
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