The CR/CF single circuit with normally open contact configuration is available in Aluminum and White finish. The suffix "W" denotes the White finish of the units. This heat 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 is often 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 Rate-of-Rise is recommended in conjunction with sprinkler devices as the detector will initiate and alarm before the waterflow switch.


Rate-of-Rise & Fixed Temperature
The Model Number prefix “CR” indicates that the detector is a combination Rate-of-Rise and Fixed Temperature,(often referred to as “Dual-action”), unit.  The Rate-of-Rise function allows the detector to close its contacts when the temperature at the ceiling increases at a rate of 8.4 Celsius degrees (15 Fahrenheit degrees) per minute. The closure of the contacts initiates the Fire Alarm sequence.  The Fixed Temperature portion consists of a spring-loaded plunger held in place by a eutectic solder that will fuse at the specific temperature (in Fahrenheit degrees) as indicated by the Model Number i.e. 135, 165, and 200.

Fixed Temperature Only
The Model Number prefix “CF” indicates that the detector is Fixed Temperature Only, and will therefore not respond to a rate of temperature increase but will operate when the detector fuses at the prescribed (Fahrenheit) temperature as indicated by the model number, i.e. 135, 165, and 200.  This detector is referred to as “Fixed Temperature Only, non-restorable”.