• Do not install detectors in areas where there is likely to be steam, such as in hospital patient rooms with vaporizers, near shower
rooms, above large sinks, and so on.
• Do not install detectors above ashtrays in elevator lobbies.
• Wall-mounted detectors should be located 4 to 12 inches, or 10 to 30.5 centimeters from the ceiling to the detector head.
• Protect all detector heads during construction to avoid infiltration of construction debris. Remove any protective covers before
activating the system.
• If using an adapter plate, tighten the mounting screws without warping the adapter plate.
• Smoke detectors are not to be used with detector guards unless the combination has been evaluated and found suitable for that
purpose.
3.2 4098 Heat Detectors
This section contains general notes, specifications, and mounting information about the heat detectors in Specifications.
WARNING: Heat detectors are NOT life-safety devices: USE HEAT DETECTORS FOR PROPERTY PROTECTION ONLY! For life-safety
requirements, use smoke detectors.
Note:
• For all heat detectors, provide electronic supervision with a battery back-up at the fire alarm control panel.
• Where the possibility of positive airflow from the electrical conduit or junction box exists, use 3M Weatherban number 606, or an
equivalent, non-flammable sealing compound to seal the conduit openings.
• Refer to NFPA 72 for application, test and maintenance requirements.
3.2.1 Heat detector types
Fixed temperature heat detectors
Electronic fixed temperature heat detectors use a fast response, thermistor based design that senses temperatures quickly and accurately,
and consistently identifies when fixed temperatures are exceeded. For this reason, the fixed temperature detectors are recommended for
most applications. With a UL spacing distance of 60 X 60 foot, the fixed temperature electronic heat detectors replace both the mechanical
fixed and the mechanical ROR heat detectors.
ROR temperature heat detectors
Electronic ROR heat detectors detect fixed temperature alarm thresholds in the same way as the fixed temperature heat detectors, and
also detect a ROR alarm with a patented ROR detection design that quickly responds to sudden temperature variations. Due to the nature
of the fast response to temperature changes, the correct installation of ROR heat detectors is important. Install ROR heat detectors in
stable environmentally controlled areas. Do not install these detectors where hot or cold air can be blown on them, such as near ductwork,
industrial equipment, air vents, and so on. Do not install ROR detectors where more than 6ºF per minute temperature changes can
normally occur.
3.2.2 Specifications
Features
• Rate-of-Rise and Fixed Temperature, see Table 3.
• Alarm LED.
• Compatible with 2-Wire Initiating Device Circuits (IDCs).
• Current-Limited Alarm State.
Electrical Specifications
• Typical standby current - 80 mA.
• Typical alarm current - 40 mA.
• Maximum current - 80 mA while in an alarm state.
• Operating range - 15-32 VDC.
• Maximum ripple voltage permitted - 30%.
page 11 574-709 Rev. AP
4098 Detectors, Sensors, and Bases Application Manual
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