Elk M1 M1KPNAV Fire Trouble

[amazander]

I have a prewired house which uses some old System Sensors 2100S smoke detector. As you know these are two wire smoke detectors - good thing is that it is hardwired through the house, bad thing is that it is 2 wire only - which I can live with.

I have the following questions:

1. Since they are pre-wired and I do not want to change it, I jumped M1 to support 2-wire fire mode and uses Zone 16. After I enable it, it gives me "Fire Trouble". I did some research and find from the old wiring diagram that it is use an EOL of 2200 ohm. Elk requires 820ohm EOL. Could this be the problem? If so, how to fix it? I see the only way is for me to climb up and down (there are quite some detectors) and find which one is the end of the line by measuring the resistance if the EOLR is not visible. Is there a smart way to do it? If I find which one is the end of the loop, and the EOL is embedded in the wall, how to fix it? I can only think of install another resistance of 1307ohm in parallel to bring it down to 820ohm if that is the problem...

2. How long do these sensors last? These detectors are probably in the house for 10 years and I am not sure if they work any more...

3. If I were to change the detectors, what 2-wire smoke/heat detector would you recommend for elk m1? I do not want to mes with the wiring so I want to stay with 2-wire...

Thanks

 

[gatchel]

1. The wrong EOLR could/is definitely be your issue. You have to find the lsat detector. Don't install a partial value resistor to "fix" the problem.

2. NFPA says that the recommended service life is 10 years from what I've seen. So does system sensor:

http://www.systemsen.../I56-710-05.pdf

Page 4 under limitations...


3. Elk lists the brands and models that are compatible, I would start on page 6 of the installation manual.

 

[amazander]

1. The wrong EOLR could/is definitely be your issue. You have to find the lsat detector. Don't install a partial value resistor to "fix" the problem.

2. NFPA says that the recommended service life is 10 years from what I've seen. So does system sensor:

http://www.systemsen.../I56-710-05.pdf

Page 4 under limitations...


3. Elk lists the brands and models that are compatible, I would start on page 6 of the installation manual.

Thanks - I will get my ladder ready... I will shutdown the panel and bring a multi-meter....

 

[amazander]

also, Is 4-wire detector better than 2-wire? Any experience?

 

[Spanky]

Any zone can be a four wire fire zone, so you have more options for zoning individual smoke detectors.

A 2200 EOL resistor will probably give a fire trouble. The smokes should be wired in series, so start removing the smokes from their base until you find the one with the EOL resistor installed.