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AVAC VOICE ALARM SYSTEM
MOUNTING AVAC
The enclosure can be surface or semi-flush mounted (see page 11). It comprises a hinged metal
lid and metal back box containing all of the system's electronics. To protect the electronics
against damage during first fix installation, most of the PCBs are located on a removable chas-
sis plate, as shown below.
The enclosure must be sited internally in an area not subject to conditions likely to affect its
performance, e.g. damp, salt-air, water ingress, extremes of temperature, physical abuse, etc.
It should be positioned at a height where it is easily accessible and in a prominent position
within the building. Ideally, the indicators on the front of the enclosure should be at eye level.
The AVAC Enclosure
Removing the lid and chassis plate
To expose all of the base mounting holes, the lid and chassis plate should be removed from
the enclosure prior to first fix installation.
To remove the lid:
•
Undo the two screws on the right hand side of the AVAC using the Allen key provided.
•
Hinge the lid 180° to the left and remove the lid earth strap from the base earth connection
(take care not to overbend the hinges).
•
Disconnect the lid/base connecting cables (PL6 and PL5) from the Main PCB. Take care to
depress the telecoms-style locking tab on the PL6 connector to prevent damage.
•
Carefully remove the four wing nuts and washers that secure the hinges.
To remove the chassis plate:
•
Ensure power has been removed from the AVAC and that the Power Supply PCB is safe to
handle (see page 13).
•
Pull the chassis earth strap off the spade connector on the base earth point.
•
Remove all of the chassis plate's retaining screws with the exception of the three keyhole
retaining screws at the top of the chassis plate which should be loosened by about three turns.
•
Push the chassis plate up and over the three keyhole retaining screws.
The lid and chassis plate can now be removed from site to prevent accidental damage. They
should be stored in a clean, dry place which is free from vibration, dust and excessive heat.
AVAC Installation and Maintenance Manual • Approved Document No. DAU0000402 Rev 6 • Page 10
www.acornfiresecurity.com
LID EARTH STRAP
PL2
PL1
Anti-static handling guidelines: Prior to handling any of the AVAC's internal
components, operators should rid themselves of any personal electro-static charge by
momentarily touching any sound connection to safety earth, e.g. a radiator.
www.acornfiresecurity.com
MAIN
AMPLIFIER
PCB
PCB
DIGITAL
MESSAGE
STORE
PCB
PL6
PL5
CHASSIS PLATE
CHASSIS EARTH STRAP
POWER
SUPPLY
PCB
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