Apollo Discovery Manual Call Point with Isolator, Addressable, Red 58100-908APO

What this call point does

This Apollo call point lets anyone raise a fire alarm by hand. It gives the system a human trigger, which still matters when people notice a fire before a detector does.

It suits installers building or extending an addressable loop, and building managers replacing a damaged unit.

How it works

• Deformable element: pressing the front deforms the resettable element and operates a switch. No glass has to break.
• Interrupting the poll: a panel normally asks each device in turn for its status. This device breaks into that cycle, which is why the response is very fast.
• The isolator: an isolator cuts off a short-circuited section of loop so the rest keeps working. An amber/yellow LED shows a short-circuit on the wiring either side.

Where to use it

Call points usually sit at exits and on the routes to them, at a height people can reach, and the system design fixes the exact positions. It works from -20ºC to 60ºC, with no condensing or icing.

IP24D is a modest rating, so choose a weatherproof type for exposed positions.

What the figures mean in practice

• Analogue values: 16 is the normal value the panel reads, and 64 is the alarm state value it reads when the call point operates.
• 100 µA quiescent: add this standing draw for each device to the loop calculation, along with the 4 mA alarm current.
• 26.5 mm depth: this is the shallow figure for the call point itself, and the surface backbox adds to what stands off the wall.

Installing it

• Polarity: keep L1 and L2 the right way round, as the supply is polarity sensitive.
• First fix: clip-on terminal blocks make it possible to wire first, then prove the cabling with the continuity connector before commissioning.
• Addressing: set the seven-segment DIL switch at commissioning. A DIL switch is a small bank of on and off switches.

Planning your system

The job needs an addressable panel using a compatible protocol, and enough devices on the loop calculation. See other Apollo call points if you need the version without isolator, or browse all manual call points for other systems.

A hinged cover (part 26729-152) and locking tags (part 26729-179) are the maker's parts for accidental operation. Only use them after checking the EN54-11 warning with whoever holds the fire strategy.

The fire alarm design also decides how many isolators each loop needs and where they sit.

Standards and approvals explained

• EN 54-11: the standard for manual call points.
• EN 54-17: 2005: the standard for short-circuit isolators, which is why it applies to this isolated version.