This is the standard THERMOFLEX™ double circuit, Normally Open (N/O) contacts detector, in which the connectivity is modified with pigtail leads that extend through a seal plate.This provides for enhanced protection against corrosive or moisture-laden environments. The model number suffix “-2”, indicates that the detectoir is a double circuit with two (2) sets of Normally Open (N/O) contacts. Each set of contacts is provided with 4 fly leads (pigtails). For each set, a pair of black leads connects to one side of the contacts and a pair of white leads connects to the other side of the contacts.
Application
This detector is suitable for use in areas where condensation or corrosion couldn have harmful effects on circuit wiring connected to standard terminals. Its seal plate (with extended pigtail leads) will mount onto a typical cast exterior back box or standard 4-inch octagon box.The detector is connected to a fire alarm system’s input circuit as an initiating device.The internal contacts are normally open, and will close when the detector operates either on a rate of temperature increase, or if the releasing temperature is reached. It can be installed with an addressing module if it is to be annunciated as a specific room or space, e.g. electrical room, garbage compactor, etc. With its non-metallic diaphragm, the detector can operate normally at low temperatures, making it suitable for non-heated or chilled environments including garages and carports.
The second set of N/O contacts are used to activate a local ancillary function that includes elevator recall, release of magnetically-held doors, local signal operation, local annunciation, etc. In many cases this set of contacts will be connected to a controlling relay that is used to switch heavier voltages.
Combination Rate-of-Rise & Fixed Temperature