SilentKnight HFS-T User Manual

Installation and maintenance instructions

This sensor must be installed in compliance with the control panel system
installation manual. The installation must meet the requirements of the Au-
thority Having Jurisdiction (AHJ). Sensors offer maximum performance when
installed in compliance with the National Fire Protection Association (NFPA);
see NFPA 72.
GENERAL DESCRIPTION
Model HFS-T is an intelligent sensor with a plug-in detector base that utilizes
a state-of-the-art thermistor sensing circuit for fast response. These sensors are
designed to provide open area protection with 50 foot spacing capability as ap-
proved by UL 521. Model HFS-T is a fixed temperature sensor with 135°F fixed
temperature alarm. The sensor transmits an analog representation of tempera-
ture over a communication line to a control panel. Rotary decade switches are
provided for setting the sensor’s address. The detector is intended for use in a
2-wire intelligent system, with screw terminals provided for power (+ and –).

The HFS-T detector requires compatible addressable communications to func-
tion properly. Connect this sensor to listed-compatible control panels only.

Communication takes place over the power (+ and –) lines.
BASE TERMINALS (SEE FIGURE 1)
NO.

FUNCTION

Power (–)

Power (+)

SPACING
Space sensors in compliance with NFPA 72. In low air flow applications with
smooth ceilings, space sensors 30 feet apart. For specific information regard-
ing sensor spacing, placement, and special applications, refer to NFPA 72 or
the System Smoke Detector Application Guide.

NOTE: These products are not listed for use inside duct smoke detectors.
MOUNTING
This detector base mounts directly to 3½- and 4-inch octagon boxes, 4-inch
square boxes (with or without plaster rings, see Figure 2), and single gang
boxes. Install the base on the box using the screws supplied with the junction
box and the appropriate mounting slots in the base.

HW-400-006

I56-3485-000R

HFS-T Intelligent Plug-In Temperature Sensor
with Plug-In Detector Base

SPECIFICATIONS
Operating Voltage Range:

15 to 32 Volts DC Peak

Standby Current:

300 µA @ 24 VDC (one communication every 5 seconds with LED blink enabled)

Maximum Alarm Current (LED on):

6.5 mA @ 24 VDC

Operating Humidity Range:

10% to 93% Relative Humidity, Non-condensing

Fixed Temperature Rating:

135°F (57°C)

Installation Temperature:

–4°F to 100°F (–20°C to 38°C)

Height:

2.0˝ (51 mm)

Diameter:

6.1˝ (155 mm)

Weight:

4.8 ounces (137 gm)

Mounting:

4-inch (102 mm) square box with or without plaster ring; Minimum Depth – 1.5 inches (38 mm)

4-inch Octagon Box; Minimum Depth – 1.5 inches (38 mm)

3½-inch Octagon Box; Minimum Depth – 1.5 inches (38 mm)

Single Gang Box; Minimum Depth – 1.5 inches (38 mm)

INSTALLATION AND MAINTENANCE INSTRUCTIONS

WIRING GUIDE
All wiring must be installed in compliance with the National Electrical Code,
applicable local codes and any special requirements of the Authority Having
Jurisdiction. Proper wire gauges should be used. The conductors used to con-
nect smoke detectors to control panels and accessory devices should be color-
coded to reduce the likelihood of wiring errors. Improper connections will
prevent a system from responding properly in the event of a fire.

For signal wiring (the wiring between interconnected detectors), it is recom-
mended that the wire be no smaller than AWG 18. However, the screws and
clamping plate in the base can accommodate wire sizes up to AWG 12. The
use of twisted pair wiring or shielded cable for the power (+ and –) loop is
recommended to minimize the effects of electrical interference.

If shielded cable is used, the shield connection to and from the detector must
be continuous by using wire nuts, crimping, or soldering, as appropriate for a
reliable connection.

12 Clintonville Road

Northford, CT 06472-1653

Phone: 203.484.7161

FIGURE 1. TERMINAL LAyOUT:

FIGURE 2. MOUNTING DETECTOR TO BOx:

BASE

TERMINALS

C0127-01

C0128-02

SCREWS

(NOT SUPPLIED)

DETECTOR

BASE

BOX

(NOT SUPPLIED)

FCC STATEMENT

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause undesired operation.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used
in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular instal-
lation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following measures:

– Reorient or relocate the receiving antenna.

– Increase the separation between the equipment and receiver.

– Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

– Consult the dealer or an experienced radio/TV technician for help.

Please refer to insert for the Limitations of Fire Alarm Systems

HW-400-006

I56-3485-000R

R E V I S E D

by the Graphic Development Department

Please review all content carefully.

9:25 am, Oct 07, 2009