AM2020/AFP1010 Troubleshooting Guide 50432 Revision A 8/13/97
26
Day/Night Sensitivity allows the user to automatically force the sensitivity of
selected addressable detectors to either a HIGH or LOW setting at a pre-
programmed time of day.
Note: Day/Night Sensitivity must enabled (and the HIGH and LOW sensitivity
zones must be assigned) in either Full or Partial System Programming.
Example: A good application of this would be in an office building where the
employees are allowed to smoke and typically occupy the building from 8:00 AM
to 5:00 PM. Since there is a higher ambient smoke level in the environment
during business hours it may be wise to set the detectors for MEDIUM sensitivity
to reduce the risk of false alarms during this part of the day.
The Day/Night Sensitivity feature may be used to automatically force the
detectors to HIGH sensitivity after 5:00 PM. Since the building is unoccupied,
and no one is smoking, there should be less chance of false alarms and the
HIGH sensitivity setting may be used for the early detection of real alarms. In
addition, since the building is unoccupied on weekends, the detectors may also
be forced HIGH for all of Saturday and Sunday.
The following steps may be used to program the above application:
1) Enable High Day/Night Sensitivity in either Full or Partial System Program
ming.
2) Assign Zone 240 (reverse-activated) as the High Day/Night zone.
3) Set the sensitivity of all the addressable detectors to MEDIUM in Full or
Partial Point Programming.
4) Assign all the addressable detectors to participate in Day/Night Sensitivity in
Full or Partial Point Programming.
5) Program the following Control-By-Event equations:
Z240:
OR(Z237 Z238 Z239)
Z239:
TIM(MO TU WE TR FR 17.00 24.00)
Z238:
TIM(MO TU WE TR FR 00.00 08.00)
Z237:
TIM(SU SA)
Note: Two TIM equations (Z238 and Z239) must be used because the required
zone activation extends from one day through midnight to another day.
Zone 239 will be activated from 5:00 PM through midnight. Zone 238 will be
activated from midnight until 8:00 AM. Since Zone 240 is the "OR" of these two
zones, Zone 240 will be activated from 5:00 PM until 8:00 AM the next morning.
Zone 237 will be activated all day Saturday and Sunday, which will in turn cause
Zone 240 to be activated during those days (forcing the detectors to HIGH).
In order to meet UL 864, Underwriters Laboratories requires that the control
panel query the user as to what NFPA listings are trying to be met with a specific
installation. When the user selects a specific NFPA listing, the AM2020/
AFP1010 automatically programs in certain control modules that are necessary
to meet that listing.
What is "Day/Night"
Sensitivity?
What Does "Do You Want
to Modify NFPA Listings"
Mean?
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