Custom Electronics AOV Multi Zone - Manual (Page 12)

6) Installation Instructions
1.1 Environment
The units are suitable for use in most indoor environments where an IP rating of IP30 is acceptable.
1.2 Mounting
The unit should be fitted in an upright position on a solid surface using
the 4 fixing holes provided. There is a “keyhole” at the upper centre of
the enclosure which should only be used to assist in hanging the unit
whilst the rest of the fixing holes are being marked. The unit should be
located so that later access for maintenance purposes is not restricted.
There are 20mm cable entry knockouts on the top side of the enclosure
and again attention should be paid to allowing easy access to the
knockouts.
1.3 Connections
Mains: The unit connects to the AC mains supply via a fused spur unit
fitted with a 5 Amp fuse. The unit must be earthed. The spur and
wiring should have been installed in accordance with the relevant
wiring regulations and by an approved electrician. The wires should be
brought into the unit through the enclosure’s 20mm knockouts.
Appropriate glands compatible with wiring type must be used.
The mains wires from the spur must be connected to the fused mains
input block on the power supply. The polarity must be observed. The
recommended cable size for the mains wiring is 1 sq. mm minimum.
The fuse-block uses a 5Amp 25mm type fuse.
Battery: The unit is designed to charge a pair of Sealed Lead Acid
batteries wired in series to give 24V and to keep them charged for
standby duty in the event of a mains fail condition. The output
connection terminals to the battery are at the bottom edge of the PCB.
Leads are supplied for connection of the batteries and should be
connected as per diagram with red as the positive (+) and black as the
negative (-). The interconnection lead is black. The batteries should be
placed in the bottom of the enclosure.
Note: The unit also has a relay output with a single set of volt-free
contacts (com n/c n/o) for fault monitoring. This relay is permanently
energised when AC mains is present and will drop out when any of the
fault conditions are present. The volt-free connections are at the
bottom left edge of the PCB.