Wiring detectors in series.

[john123]

I would really like to solve this ongoing problem!

I have a scantronic 9448+ control panel which blew the 12V fuse.  The alarm company told me it was a fault in a 40ft long 4 core cable to 2 old detectors in series.  I checked the cable but no short and continuity OK etc so rather than replacing the wire, the alarm guys gave me 2 Texecom capture P15s to try.   The control panel seems to have all the resistors already there.

My first question is; 4 core cable 12V and 0V wires obvious. Do I then take wires from A (alarm) and D(tamper) back to the control panel as shown on the box for EOL? Do I need to set the resistor in the P15s as the control panel has these.

Secondly, if this works for one  P15 how do I connect 2 P15s in series? Do I connect A to D then C to 2nd detector A or B then back to control panel from D ? The detectors will connect through a wall, short cable for 2 rooms. Do I need to change the resistor setting in the P15s.

I have lots of Photos if helpful. Really would appreciate any solution. 

Many thanks,

John123

I

[al-yeti]

Your only using one pair for alarm and tamper if your using eol

 

There must be another reason the resistors are in the panel and not in the detectors , maybe short cut when last panel change took place

[al-yeti]

Apart from that I don't remember 9448 using resistors anyway but might be me, thought it was a global tamper , old scrap panel needs to go anyway 

 

So where are your pictures?

Edited September 17 by al-yeti

[james.wilson]

AFAIK the 9448 isn't an eol panel

You also shouldn't wire more than 1 sensor to a circuit

I'd be interested in the photos. 

 

If not eol you can't have a tamper circuit and an alarm circuit on 2 wires. 

If it is eol you can't make it work as you will have issues when both detw otrs are active unless you have a 6 core between the detecrors

I assume it's a daisy chain and not 2 wires at the panel? 

 

[sixwheeledbeast]

For the reasons outlined above the cable needs replacing either way, probably best with an 8 core.

[john123]

Scantronic 9448+ V3.1 zone 4 disconnected (Blue wire in place of).

P15 sensor.

I plan to connect A and B to Zone4 (as in diagram) and see if this works (indicating 4 core cable is intact). 

I then want to connect a second P15 in series but unsure which sensor connections to link in series. Do I need to do anything with the variable resistors in the P15 sensors?  Very grateful for an easy explanation! Many thanks. John

[al-yeti]

2 hours ago, john123 said:

Scantronic 9448+ V3.1 zone 4 disconnected (Blue wire in place of).

P15 sensor.

I plan to connect A and B to Zone4 (as in diagram) and see if this works (indicating 4 core cable is intact). 

I then want to connect a second P15 in series but unsure which sensor connections to link in series. Do I need to do anything with the variable resistors in the P15 sensors?  Very grateful for an easy explanation! Many thanks. John

You want to use o/c

 

Alarms as you said 

 

Tampers in series at the panel and between detectors where required 

[sixwheeledbeast]

14 hours ago, sixwheeledbeast said:

For the reasons outlined above the cable needs replacing either way, probably best with an 8 core.

 

A single PIR should be a 6 core at least with a double pole panel. You can run two PIR's on an 8 core double pole.

EOL wiring/resistors will not work on a double pole panel.

You shouldn't put multiple devices of this type on a single zone, which is why you won't find a manual/guide instructing this.

If you really have to reuse the 4 core you should upgrade equipment and use a BUS type device or expander.

[john123]

The other detectors have a short non resisted wire joining alarm and tamper (B and D). Do I need to do this in the P15 to complete the loop with 4 core? Thanks. John.

[MrHappy]

17 minutes ago, john123 said:

The other detectors have a short non resisted wire joining alarm and tamper (B and D). Do I need to do this in the P15 to complete the loop with 4 core? Thanks. John.

 

Pyronix Magum ?

 

The link is pointless as it will only work when the alarm is set....