Page 3
Issue 1, March 2005
Heritage Medcall Sentry Emergency Call System
Model 560B Smoke Detector
Installation and Service Instructions
460-560B 0305 ©Heritage MedCall, Inc.
the receiver. The receiver’s 3/4" thick enclosure is
designed to fit in the smoke detector electrical box.
Often a facility will purchase a few sets of pendants &
receivers to use on a special basis for residents that
might be recuperating from surgery. With the
possibility of future use, always install 2 or 4 extra
conductors to the smoke detector wiring.
SUPERVISION
Power wiring in four-wire systems is required by NFPA
72 to be supervised. Smoke detectors are supervised
by the apartment host panel and the console. Supervi-
sion is achieved by using both the End-Of-Line (EOL)
resistor (P/N HM-585) and a Smoke Load resistor
(P/N HM-568) or by using the End-of-Line Device (HM-
569). This type of supervision requires that multiple
smoke detectors are wired in a daisy chain, from the
host panel to the last detector which includes the
EOL and Smoke Load or EOL Device. When the host
panel is located in the apartment center, the wire
must go to one detector then back towards the host
panel and on to the last detector.
NOTE: Wiring must be installed so when a
detector is disconnected for any reason, the end-
of-line resistor or device must become
disconnected.
A break in the detector power circuit or contact circuit
will cause a trouble annunciation at the Sentry
console.
WIRE REQUIREMENTS
The Sentry smoke detector can be installed in many
different arrangements to meet most system
requirements. The wiring diagrams illustrate the
typical installation methods and shows the
recommended minimum number of conductors to use.
Sentry recommends to always have an additional 2 or
4 conductors as spare for future options.
Heritage MedCall recommends the following wire or
equivalent for installation of the Sentry smoke
detectors:
6 conductor: West Penn Wire (WPW) # 252
8 conductor: WPW # 253
DUST PROTECTION
System installers should be directed to place the
plastic dust cover that comes in the smoke detector
carton over the installed detector. This simple step
will protect the sensing chamber and screens from
the usual dust buildup during construction and
painting.
FIGURE 3 PLUG-IN TERMINAL BLOCK
FIGURE 4 DETECTOR MOUNTING
INSTALLATION
The detectors mount to standard single-gang electri-
cal boxes, four-inch octagonal or four-inch square
electrical boxes, or on WIREMOLD No. 5739 fixture
boxes. The detectors may also be mounted directly to
walls or ceilings where local codes/jurisdictions
permit.
1. Pull wire through the electrical box and connect to
