4 wire System Sensor SS-4WTA-B with OPII

[charliebarns]

I'm about to order my 4 wire smokes and want to make sure I understand the components needed. I'll be using one SS-4WTA-B 4 wire photoelectric with sensor one each floor. Each single smoke detector/sounder will be on it's own zone/loop. This is in addition to the 120V system in the house. The documents at HAI indicate that an end-of-line power supervision relay is required, Worthington's documentation indicates a supervision relay plus a polarity reversing module is required. However, as I understand it this is only if you are going to have more than one detector/sounder on a loop. In my case, since there is only one sounder on a loop, I should not need the power supervision relay or the polarity reversing relay....correct?


Thanks

CB

 

[gatchel]

You'll need one reversing relay if you want all of the sounders in each device to go off when an alarm occurs.


You'll need one power supervision relay per zone if you are going to properly supervise each smoke zone. The whole point of a power supervision relay is to remove the EOL resistor from the zone if the power to the detector fails. The detectors are normally open devices that close when they detect smoke or heat. In, theory you could have a EOL resistor on the smoke to satisfy the zone supervision, but if the power failed you'd never know. That's where the power supervision relay comes in.

Maybe they mean that the power supervision relay only has to go on one device in a loop, at the end. You could have x devices in a zone loop with only one supervision relay at the end.

 

[charliebarns]

You'll need one reversing relay if you want all of the sounders in each device to go off when an alarm occurs.


You'll need one power supervision relay per zone if you are going to properly supervise each smoke zone. The whole point of a power supervision relay is to remove the EOL resistor from the zone if the power to the detector fails. The detectors are normally open devices that close when they detect smoke or heat. In, theory you could have a EOL resistor on the smoke to satisfy the zone supervision, but if the power failed you'd never know. That's where the power supervision relay comes in.

Maybe they mean that the power supervision relay only has to go on one device in a loop, at the end. You could have x devices in a zone loop with only one supervision relay at the end.

Thx for the reply. One reversing relay for all three loops, or one reversing relay per loop? The diagram provided only give a one loop example as shown...

 

[gatchel]

You would basically wire all of the power wires from each zone (3 zones total) to the one reversing relay. This would sound all units by reversing power to all of them at the same time.

Main power feed to the reversing relay, reversing relay power wires to a connector block or wire nuts, connector block (or wire nuts) to smoke zone(s) power wires for all 3 zones. Each zone gets a power supervision relay at the end of line. Make sure to check your current draw.

Also keep in mind that you should check the codes in your area. I am not a "fire guy" per say. What I am suggesting is only electrically sound. The codes, fire codes, etc, that's on you.

 

[charliebarns]

You would basically wire all of the power wires from each zone (3 zones total) to the one reversing relay. This would sound all units by reversing power to all of them at the same time.

Main power feed to the reversing relay, reversing relay power wires to a connector block or wire nuts, connector block (or wire nuts) to smoke zone(s) power wires for all 3 zones. Each zone gets a power supervision relay at the end of line. Make sure to check your current draw.

Also keep in mind that you should check the codes in your area. I am not a "fire guy" per say. What I am suggesting is only electrically sound. The codes, fire codes, etc, that's on you.

Thanks Gatchel. I picked up all the equipment to complete this today. I assume even though there is an EOL relay on each zone you still require the EOL resistor correct? From your explanation it sounds like it's the EOL Relay that trips the resistor (so to speak) which closes the circuit and thus sounds the alarm.

cb

 

[gatchel]

Actually the EOL relay is powered keeping the zone supervised by showing the resistance across the zone. When the EOL relay loses power it creates an open loop on the zone and a zone trouble at the panel.

The fire alarm is triggered when a detector trips and creates a closure or dead short across the zone. This causes a fire alarm.

 

[charliebarns]

Actually the EOL relay is powered keeping the zone supervised by showing the resistance across the zone. When the EOL relay loses power it creates an open loop on the zone and a zone trouble at the panel.

The fire alarm is triggered when a detector trips and creates a closure or dead short across the zone. This causes a fire alarm.

got it. So does that mean the EOL relay acts like a resistor, therefore the resistor is not required? one more question, the SS4wtab were not available so I went with System Sensor 2012H found here http://www.systemsensor.com/pdf/A05-0238.pdf

They are 4 wire smokes with a built in relay (which I don't think I'll need) but they say they require their own 12V Power supply. Can I just power these from my OPII? I will only have one on each floor for a total of 3, with a max draw of 20 mA average @ 12 VDC.

Thanks!


CB

 

[gatchel]

Read the diagram in your post #3 above. The resistor is not located in the relay, you have to add it in series.

I haven't used the 2012H units. It looks like they communicate with each other using the 4 wires interconnected between them. You will have to use the relay to send a signal to the alarm panel if you want the alarm to go off. You basically changed the whole design and operation of what has been discussed previously in this thread by buying these units.

As far as power goes, you can power these units from any 12vdc power supply as long as the devices on the supply don't overload it (too much current).

As far as UL rating and battery backup, it's up to you to determine what is legal in your area.

Good Luck!

 

[charliebarns]

Read the diagram in your post #3 above. The resistor is not located in the relay, you have to add it in series.

I haven't used the 2012H units. It looks like they communicate with each other using the 4 wires interconnected between them. You will have to use the relay to send a signal to the alarm panel if you want the alarm to go off. You basically changed the whole design and operation of what has been discussed previously in this thread by buying these units.

As far as power goes, you can power these units from any 12vdc power supply as long as the devices on the supply don't overload it (too much current).

As far as UL rating and battery backup, it's up to you to determine what is legal in your area.

Good Luck!

Can you recommend a different unit that this and the 4WTA-B? The 4WTA-B is not UL approved for use in Canada.

Thx