UNITY DAU Installation & Maintenance Manual
Preparation
Remove the front panel plate containing the circuit boards, this has a connection to the mains
transformer, which needs to be removed, Exercise static precautions to prevent damage to
the electronics, store the front panel assembly safely until the exchange is mounted and
cables have been attached.
Before mounting the DAU on the wall it is advisable to remove the cable knockouts. Decide
how the wiring will be brought into the panel and remove the required knockouts for cable
entry. If a knockout is removed fill the hole with a good quality cable gland. 18 knockouts are
provided, 8 on the top face from left to right, Speaker Network A, Speaker Network B, Fault,
Fire alarm Interface, Fire Microphone connection, Paging Microphone connection and finally
music input. These glands are repeated on the rear face. On the bottom face a single
knockout is for the incoming mains, this is repeated on the rear, mains SHOULD NOT enter
the box by any other hole. If additional holes are required, then the can be drilled as shown
below, taking care not to obscure the battery or PCB locations. Unused knockouts must be
left unopened to comply with the LVD, accidentally knocked out holes should be blanked off.
This work must be carried out prior to the re-installation of circuit boards.
Document DCC UND 7001-01 Rev 1 June 2005
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