Apollo Fire Detectors
Discovery ASD-1 Product Guide
www.apollo-fire.co.uk
9
3
Wiring
The following wiring connections must be made to the detector housing:
l
24V DC Power Supply. Refer to Section 3.3 for further information.
This wiring enters the detector housing via cable seals and is connected to the appropriate terminals on the
main circuit board or display board. The terminals allow wire with a maximum diameter of 2.5mm².
Warning:
To prevent risk of electric shock or possible injury from the rotation of the high performance fan,
the system should be isolated from the power supply when the display board is removed.
Caution:
When installing or servicing the unit, ensure that the operator is safely grounded so as to prevent
electro-static discharge (ESD) damage to the unit.
3.1
Wiring Access
For correct operation of the unit it is essential that the case is fully sealed so that air can only be drawn into the
system through the aspirating pipe. For this reason, all wiring must pass through the cable seals provided and
no additional holes should be made in the detector housing.
In order to pass a cable through a seal, make a small hole in the centre of the seal with a pointed implement
(e.g. small screwdriver) and then force the cable through the hole into the box. The small hole should expand
to accommodate any cable diameter from 4 to 10 mm (0.16 to 0.43 in.). If the seal is not airtight, then it may be
necessary to use a non-reactive resin or glue to create an airtight seal in order to maintain an IP65 rating, to
ensure that air is only drawn through the air sampling pipe network.
3.2
Connect Wiring
In order to gain access to the main circuit board for connection of the wiring, remove the display/detector
mounting board which is held in place by the clear top cover. To fully remove the display/detector mounting
board, disconnect the ribbon cable from the rear of the board.
Caution:
Care should be taken when removing the board to ensure that the ribbon cable on the underside
is not strained.
Caution:
Due to the failsafe relay, opposite switch positions are printed on the PCB.
Warning:
To prevent risk of electric shock or possible injury from the rotation of the high performance fan,
the system should be isolated from the power supply when the display board is removed.
All connections to the main circuit board are to pluggable terminals that can accommodate wire sizes up to
2.5mm².
