Page 1
Issue 1, March 2005
Heritage Medcall Sentry Emergency Call System
Model 560B Smoke Detector
Installation and Service Instructions
460-560B 0305 ©Heritage MedCall, Inc.
PRINCIPLE OF OPERATION
The Model HM-560 Smoke Detector is a conventional
4-wire 12 VDC photoelectric smoke detector. This
technology is superior in reliability and performance to
less expensive ionization type smoke detectors. A
high intensity infrared light emitting diode (LED) light
source is pulsed in a sensing chamber that is de-
signed for optimum smoke entry. The light source
LED and a photo-diode sensor are positioned in the
chamber at angles to each other so that when no
smoke is in the chamber, the sensor sees virtually no
light.
Light scattered by smoke particles in the chamber is
sensed by the photo-diode. When the light reaching
the photo-diode reaches a predetermined level, the
detector will sound an alarm. Once the smoke has
been cleared from the unit, it is reset by pushing the
Check-In button on the apartment Host Panel.
Because smoke may have to travel some distance
from the fire source to the detector, it is important that
the photoelectric detector responds best to both open
flame and smoldering fires.
The HM-560B Smoke Detector includes automatic
sensitivity testing. Once daily and upon power-up the
detector performs a full diagnostic test that includes a
dynamic test of the sensing chamber and internal
electronics. This meets NFPA 72 field sensitivity
testing requirements without the need for external
meters.
The detector also contains an integral piezoelectric
horn which produces an interrupted 85 dBa Temporal
3 tone.
WHERE TO LOCATE
The smoke alarm should be installed in accordance
with National Fire Protection Association (NFPA)
Standard 72. Excerpts follow:
A-8-1.2.1a Where to Locate the Required Smoke
Alarms in Existing Construction
The major threat from fire in a family living unit occurs
at night when everyone is asleep. The principal threat
to persons in sleeping areas comes from fires in the
remainder of the unit. Therefore, a smoke detector(s)
is best located between the bedroom areas and the
rest of the unit. In units with only one bedroom area
on one floor, the smoke detector(s) should be located
as shown in Figure 1A.
In family living units with more than one bedroom area
or with bedrooms on more than one floor, more than
one smoke detector is required, as shown in Figure
1B.
In addition to smoke alarms outside of the sleeping
areas, the installation of a smoke alarm on each
additional story of the family living unit, including the
basement, is required. These installations are shown
in Figure 1C. The living area smoke alarm should be
installed in the living room or near the stairway to the
FIGURE 1 DETECTOR LOCATION