3. Vacuum the screen carefully without removing it. If further cleaning is
required continue with Step 4, otherwise skip to Step 7.
4. Remove the chamber cover/screen assembly by pulling it straight out.
5. Use a vacuum cleaner or compressed air to remove dust and debris from
the sensing chamber.
6. Reinstall the chamber cover/screen assembly by sliding the edge over the
sensing chamber. Turn until it is firmly in place.
7. Replace the cover using the LEDs to align the cover and then gently push-
ing it until it locks into place. Make sure that the thermistors do not be-
come bent under the cover.
8. Reinstall the detector.
9. Test the detector as described in TESTING.
10. Reconnect disabled circuits.
11. Notify the proper authorities that the system is back on line.
SPECIAL NOTE REGARDING SMOKE DETECTOR GUARDS
Smoke detectors are not to be used with detector guards unless the combina-
tion has been evaluated and found suitable for that purpose.
FIGURE 3. FEATURES OF THE PHOTO/HEAT DETECTOR
Magnet
Test
Marker
LED
Base
Alignment
Notch
Magnet Test Marker
LED
Base Alignment Notch
C2023-00
FIGURE 4. CLEANING THE PHOTO/HEAT DETECTOR
Cover Removal
Tabs
Sensor Cover
Sensing Chamber
Cover and Screen
Sensing Chamber
Thermistor
Thermistor
}
C2024-00
SPECIAL APPLICATION
When configured at the fire alarm control panel, this detector is capable of op-
erating in a special application mode such that it has a higher sensitivity than
is normally allowed by UL 268 for areas where early warning is important. In
this mode, the detector does not comply with the Cooking Nuisance Smoke
Test. Detectors (Sampling ports) set to the special application mode are not
suitable for use in areas where cooking appliances may be used. If cooking
appliances are used within the protected space, a normal application detector
or normal application mode must be used for that area.
Special application mode is not for general use and the detector may be more
prone to false alarms if used in unsuitable environments. While no list is
all-inclusive, some examples of unsuitable environments for special applica-
tion mode are areas with airborne particulate or aerosols including sawing,
drilling, and grinding operations, textile or agricultural processing, or areas
with engines that are not vented to the outside. A complete list of aerosol and
particulate sources is available in the Annex of NFPA 72.
Suitable environments for special application mode could include early warn-
ing for hospitals, museums, assisted living and other areas that do not have
airborne particulate or aerosols.
Refer to the fire alarm control panel documentation for information on how to
configure the detector for special application mode.
3
I56-6783-000
1/6/2021
