Aiphone LEF intercom

[skyhawker]

Does anyone have experience with these?

We have a LEF 5 with 5 units and want to add one. Desperatly looking for guidance or if someone can point is to an installer in London.

 

[sparkymarka]

What are you wanting to add ? , been fitting aiphone equipment for years ( pretty bulletproof ) most stuff is pretty straightforword and manuals available online

 

[skyhawker]

Got a LEF 5C.

Doorbell + 4 units with latch release.

Now want to add another master to our extension.

I understand that these are daisychained.
I have located the unit with only one set of cable so that must be the last one.

My questions:
Is it correct that I need to run a cable from there to new location?
What cable should I run? How many cores? Would cat5 work?
What do I need to connect in the other units so that they recognise new device?

Picture below of unit 3 and what I assume to be last unit as no doubled over cables

 

[sparkymarka]

12 core alarm cable , as long as the other units are ŵired in 12 core

 

[skyhawker]

Thanks.

All are using 12 core

Am I correct in assuming that the unit with just one set of cables is the last one in the series and I should be running the cable for next one from there? (It is actually number 2 but if I have understood correctly, the wiring is the thing that determines which is last unit - not the connector number).

So what I would do is:

Run cable from last unit
Find an unused colour of the 12 cores (white)
Connect it to new unit C
In source unit twist its white with incoming white and connect to its empty connector which is available as it is that units own number and so on to all units?

 

[sparkymarka]

You would wire daisy chain as above or they use to do a joint box where you could wire all the units in a star configuration, the wiring determines the unit number !

 

[skyhawker]

the wiring determines the unit number !

I undertand, but if I have a unit wired as in picture 2, would that mean that it is the final unit on the daisy chain and I should/could wire from there?

It would actually suit me better to wire star config. I originally thought the the system worked on a star configetration from under the stairs because installer had 2 junction blocks there - and I ran a CAT 5 from there.

The reason I made this assumption is because I believe doorbell and unit 1 join up in a junction box under stairs and that is where the power is. Could I add the sixth unit by just starring out from there?

Would CAT5 cable work?

 

[sparkymarka]

3 issues ....need more cores , it will get confusing swopping colours , I think the install manual says avoid using twisted pairs !

 

[skyhawker]

3 issues ....need more cores , it will get confusing swopping colours , I think the install manual says avoid using twisted pairs !

Thanks so much. Managed to wire as per your advice in star from junction box and all working.

 

[sparkymarka]

Happy to hear , just the alarm issue now !

 

[skyhawker]