Wired Heat Detectors
A heat detector is a property safety device that responds to extremely high temperatures that indicate the presence of a fire. Heat detectors should not be confused with temperature sensors. For a temperature sensor, the main application is to alert the system when the HVAC system in the building has stopped working. But for a heat detector, the purpose is to respond to a fire that could cause destruction to the building and the property.
An end user should install smoke detectors over heat detectors whenever possible. This is because a smoke detector will respond more quickly to a fire than a heat detector. But there are some applications where it is better to use heat detectors. The most common reason is that installing a smoke detector in certain areas will most likely lead to false alarms. This is often due to excessive dust or moisture in the area. Another reason is because the room may sometimes contain smoke.
One example of a room that might benefit more from a heat detector than a smoke detector is a garage. This is because garages can get very dusty, and the excessive dust might activate a smoke detector. The same principle could be applied to attics. For a bathroom, the excessive moisture could cause the same effect. Kitchens are also great candidates for heat detectors, as the resulting smoke from cooking food could cause a smoke detector to activate. The same is true for rooms where someone might smoke a cigarette or other herbs.
Generally speaking, you will only use wired heat detectors if you have a hardwired system. Otherwise, it is usually easier and more practical to use wireless heat detectors. But if you have a hardwired system, then hardwired heat detectors can make a great addition. Remember, you will need to run wires from the panel to the heat detector. If you are not comfortable doing this, then it may be best to hire a trained electrician. We recommend using 18-gauge wire to complete the wiring process.
Hardwired heat detectors for alarm systems generally come in two varieties. These are 2-wire heat detectors and 4-wire heat detectors. Most users will go with 2-wire heat detectors, since they are easier to wire. But a major restriction for these devices is that they can only be used with certain hardwired zones. Most hardwired panels feature a designated zone for 2-wire smoke detectors and heat detectors. This zone will briefly cut power to the sensor when an alarm is cleared. This will reset the device automatically, with no further equipment being needed other than an end of line resistor.
When it comes to 4-wire heat detectors, greater flexibility is available. These devices can be installed at any available hardwired zone. But the downside is that additional equipment is needed to use them. You will need a relay to cut power to the device so that it resets when an alarm is cleared. You may also need to provide an external power supply if your panel does not provide sufficient power.