How Do I Wire a 2-Wire Smoke Detector to My Wired Alarm System?

To connect a 2-wire smoke to a security system, connect the positive and negative zone terminals from the alarm system to the positive and negative terminals on the smoke. Most systems require that a resistor be installed at the smoke detector to provide supervision of the zone wiring.

Zone 1 on the VISTA Security Systems are made to support 2-wire smoke detectors. There is built-in logic for the panel so that if zone 1 is programmed as a fire zone and goes into a fire alarm, entering in any valid user code + [1] will silence the alarm. The [1] key in this case is used as the "off" button. To fully reset the alarm, a valid code + [1] will need to be entered a second time. If the short on zone 1 still exists at the time of the second entry, power will be dropped momentarily for the zone, which will reset the smoke detectors that were triggered.

The power reset is momentary, and it only affects zone 1. When the zone powers back up, zone 1 is reset and ready to be used again. A VISTA system can support up to 16 compatible 2-wire smokes on zone 1. Smoke-compatibility is listed by the smoke manufacturer, so make sure to check its manual for compatibility.

Meanwhile, 4-wire smokes can be used on any zone, other than zone 1. However, they require additional wiring and programming to achieve proper supervision and to perform the power reset. Additionally, wireless smoke detectors from Honeywell's 5800 Series are also compatible. Our recommended wireless smoke is the Honeywell 5808W3 Smoke and Heat Detector.

When planning a 2-wire smoke installation, keep in mind that the zone will require an End of Line Resistor, which should be wired in parallel on the last smoke in the loop. When multiple smokes are being used, do not home run the wires for each smoke back to the panel. Instead, wire all of the 2-wire smokes in parallel with the resistor, wired as mentioned previously.

For other hard-wired security systems, you will need to reference its installation guide to find out if the panel supports 2-wire smokes, as well as where the smokes can be interfaced with the system. Not all systems are compatible with 2-wire smokes. In these situations, compatible wireless smoke detectors or 4-wire smokes will need to be used with the system instead. Check the instruction manual for your panel to find out which types of smoke detectors are compatible.

Did you find this answer useful?

We offer alarm monitoring as low as $10 / month

Click Here to Learn More
What Sterling is saying is that heats and smokes are Normally Open Devices. When a heat detector trips, it shorts the zone, hence removing its power until the heat either resets, or is removed from the loop. Most heat sensors are a one-time trip, then replace. Unlike heat detectors, 2-wire smoke detectors do not put a dead short on the fire zone, hence the zones ability to continue to function and properly reset. This is why it's not recommended, though it will work.
I am looking at upgrading my wired backbone of a panel to a Vista 21, or similar. This "fire zone" primary function is to set an alarm when there is an event. If the heat detector activated, it activated for a reason and the human action would be to alarm and get out. Same for smoke activation. The heats have a low failure rate. If it was a false alarm on smoke, they would reset like normal, if it it was heat false alarm, i would be replacing the failed unit. The house has a separate set of life savings wired interior smokes and I have fixed battery mounted Carbon monixide. The monitored zone I am looking to install is for fast alarming in the event we are home or away.
What alarm system are you using? Can you provide the manufacturer's name and/or the model number? If you aren't sure, can you email pictures to support@alarmgrid.com referencing this page so we can help further? In general, it's possible to mix 2-wire smokes and heats but not advised because heat's are one-time use only and if you ever had one trip, the smokes wouldn't work until the heat was fixed or removed from the loop.
Can 2-wire smoke detector (FSA-210BST or Sensor 2WB) be wired with attic fixed temperature heat detectors (2-wire 284B-PL) on the same zone? My goal is to have interior living space with monitored smoke detectors as well as fixed set points for attics and garage. We have dogs while away, or as kids grow up, want the added protection of both mechanisms. Can i wire them all in parallel and mix them along the chain?

Related Products

System Sensor 2WT-B - 2-Wire Smoke Detector with Fixed Heat Sensor
System Sensor 2WT-B
2-Wire Smoke Detector with Fixed Heat Sensor
List Price: $76.00
Our Price: $50.99
Honeywell VISTA-21iP-6160KT - Front of Internet Security System
Honeywell VISTA-21iP-6160KT
Internet Security System
List Price: $322.98
Our Price: $199.99
Honeywell VISTA-20P - Wired Alarm Control Panel
Honeywell VISTA-20P
Wired Alarm Control Panel
List Price: $222.00
Our Price: $145.59
Honeywell VISTA-15P - Alarm Control Panel
Honeywell VISTA-15P
Alarm Control Panel
List Price: $200.00
Our Price: $131.99
System Sensor 2WTA-B - 2-Wire Smoke Detector with Fixed Heat and Sounder
System Sensor 2WTA-B
2-Wire Smoke Detector with Fixed Heat and Sounder
List Price: $90.00
Our Price: $59.99
Honeywell VISTA-20PSIA - Alarm Control Panel
Honeywell VISTA-20PSIA
Alarm Control Panel
List Price: $222.00
Our Price: $145.99
Honeywell VISTA-15PSIA - Alarm Control Panel
Honeywell VISTA-15PSIA
Alarm Control Panel
List Price: $200.00
Our Price: $131.99
Honeywell VISTA-21iPSIA Open - Internet Alarm Control Panel
Honeywell VISTA-21iPSIA
Internet Alarm Control Panel
List Price: $326.00
Our Price: $213.99

Related Categories


Answered
Answered By