UNITY DAU Installation & Maintenance Manual
Mains Connection
>3mm
3A
Main
Distribution
Board
>0.75mm
2
<2.5mm
2
UNITY
Each Unity DAU requires a 3A spur, returning to a breaker clearly marked “
Voice Alarm DO NOT
TURN OFF”
. If the units are distributed around a site it is essential all units are on the same mains
phase, as they are classified TEN 230V, powering from different phases can mean a 440V potential can
be present in a unit during a major fault incident.
Batteries
The Unity DAU requires 2 number 12V 3.2AH sealed lead acid batteries to provide backup power in the
event of mains failure as defined in BS5839pt8 for 24 hours standby and 30 minutes operation.
For 72hour standby and 1 hour operation 2 number 12V 17AH batteries are required, these will need to
be fitted in an external battery enclosure, the monitored charger in the Unity DAU is capable of charging
and monitoring these batteries.
Safety Information:
Sealed Lead acid batteries contain sulphuric acid which can cause burns if
exposed to the skin, the low internal resistance of these batteries means large
currents will flow if they are accidentally short circuited, causing burns and a risk
of fire- exercise caution when handling batteries.
Power Up Procedure:
Always apply mains power before connecting batteries, do not commission
Unity DAU on batteries, as the high inrush current required by the power supply
may rupture the battery fuse.
Always connect the Positive (Red +) terminal first.
Power Down Procedure
Disconnect the batteries before removing the mains power; always remove the
negative (Black – terminal) first
.
Connections
Document DCC UND 7001-01 Rev 1 June 2005
Page 9 of 17
