Carnes EXSAA Installation Manual

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FORM 40020

INSTALLATION, OPERATING AND MAINTENANCE INSTRUCTIONS

SL-2000 Series Smoke Detectors, Model EXSAA and EXSAB (Ionization),

EXSAG and EXSAH (Photoelectric)

CAUTION! DO NOT INSTALL, USE OR OPERATE THIS EQUIPMENT UNTIL THIS

MANUAL HAS BEEN READ AND UNDERSTOOD. READ AND SAVE THESE INSTRUCTIONS FOR FUTURE USE.

CARNES COMPANY 448 S. Main St., P. O. Box 930040, Verona, WI 53593-0040 Phone: [phone] Fax: [phone] www.carnes.com

PRODUCT APPLICATION

SL-2000 Series duct smoke detectors provide early detection of
smoke and products of combustion present in air moving through
an HVAC duct supply, return, or both in commercial, industrial, and
residential applications. These devices are designed to prevent the
recirculation of smoke in areas by the air handling system’s fans
and blowers. Complete systems may be shut down in the event of
smoke detection.

NOTE

: For the correct installation of a duct smoke unit,

please refer to the NFPA 72 (National Fire Alarm Code), NFPA
90A (Standard for Installation of Air Conditioning and Ventilation
Systems),NFPA 92A (Recommended Practice for Smoke Control
Systems.), NFPA 5000 (Building Construction and Safety Code),
IMC (International Mechanical Code), and IFC (International Fire
Code).

This detector is not intended for open area protection nor should
it be used for early warning detection or replace a regular fire
detection system.

PRODUCT DESCRIPTION

The SL-2000 Series smoke detector is fitted with a mounting base
that will accept an ionization smoke detector head model 55000­225APO or photoelectric smoke detector head model 55000­328APO. The duct unit supports two sets of form “C” alarm con­tacts, one form “A” alarm contact and one form “C” trouble contact.
The trouble contact supervises the presence of the input power,
removal of the detector cover and the removal of the smoke
detector head.

This detector is equipped with a cover removal switch
that instantly provides a trouble condition upon removal of
the clear cover. For all testing and inspection with the cover
removed, the cover removal switch (designated as SW1 on
PCB) must be manually depressed to simulate standard
“pilot” operation. THE TROUBLE CONTACTS (TERMINALS 4,
15, 5) ARE SHOWN IN THE NON-ENERGIZED CONDITION.

The trouble contacts will not

operate in the event of a smoke alarm. The
SL-2000 Series duct detector will operate from various input voltage
sources; namely 24VAC, 24VDC, 115VAC and 230VAC.

SAMPLING TUBES

The operating principle of a duct detector is based on the Venturi
effect. Two tubes extend into the HVAC duct. Air flowing through
the duct is forced into the air intake (inlet) tube via the air intake
holes, (facing the air flow) and passes over the detector head. The
air will be drawn out via the exhaust tube back into the HVAC duct.
(A 7” exhaust tube is provided in the installation kit.) When the con­centration of smoke particles suspended in the air stream reach
the alarm threshold of the detector head, the unit will go into alarm.

The duct smoke detector units are designed to operate in duct
widths from 6” to 10’ wide with an air velocity between 100 to 4,000
feet per minute. To verify correct installation, the pressure

PRODUCT OVERVIEW

differential between the sampling (high side) and exhaust (low
side) tubes should be measured using a Magnehelic pressure
gauge or equivalent. An acceptable reading is between 0.01 and

1.2 inches of water.
To minimize the impact of air turbulence and stratification on

performance, a duct smoke detector should be located as far as
possible downstream from any obstruction (i.e. deflector plates,
elbows, dampers, etc.). In all situations, confirmation of velocity
and pressure differential within specifications is required.

REMOTE ACCESSORIES

Audible and visual alarm indicators, remote status indicators, and
remote reset/test switches can be accommodated by the SL-2000
Series duct units by connecting to DC voltage output terminals as
described on Page 4. These terminals are not supervised and the
voltage/current will only be present when the detector unit is in
alarm. The remote pilot (green) LED will be permanently illuminat­ed when connected to the output terminals as long as input power
and detector head are present.

SL-2000 AT-A-GLANCE

MODEL NUMBER:

SL-2000-N 4-Wire Ionization Duct Smoke Detector
SL-2000-P 4-Wire Photoelectric Duct Smoke Detector

DETECTOR HEAD MODEL NUMBER:

Ionization Detector Head: 55000-225APO
Photoelectric Detector Head: 55000-328APO

POWER REQUIREMENTS:

STANDBY CURRENT ALARM CURRENT

24VAC 55 mA 24VAC 190 mA
24VDC 14 mA 24VDC 68 mA
115VAC 14 mA 115VAC 32 mA
230VAC 8 mA 230VAC 18 mA

RELAY CONTACT RATINGS:

Alarm contacts: 2 Sets form “C” rated at 10A @ 115VAC resistive

1 form “A” rated at 2A
Trouble contacts: 1 Set form “C” rated at 10A @ 115VAC resistive
Air velocity: 100 to 4,000ft./min.
Ambient temperature: SL-2000-N: 32°F to 158°F (0°C to 70°C)

SL-2000-P: 32°F to 140°F (0°C to 60°C)
Humidity: 10% to 85% RH Non-Condensing/Non-Freezing
Material: Gray plastic back box with clear plastic cover

(Makrolon 94V-0)
Dimensions: 13½” L X 4½” W X 2¼” D
Max. net wt.: 3½ lbs.
Radioactive element: SL-2000-N (Ionization) - Americium 241,

0.9 micro curie.

Do not expose to corrosive atmospheres.

U.S. Patents 6,741,181 and Patents Pending

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LOCATION PREREQUISITES

This guideline contains general information on duct smoke
detector installation, but does not preclude the NFPA and/or
ICC documents listed. Air Products and Controls assumes no
responsibility for improperly installed duct detectors. To determine
the correct installation position for an SL-2000 Series duct smoke
detector, the following factors must be considered.

1) A uniform non-turbulent (laminar) air flow between 100
ft/min. to 4,000 ft/min. must be present in the HVAC duct. To
determine duct velocities, examine the engineering specifica­tions that define the expected velocities or use an Alnor model
6000AP velocity meter (or equivalent).

2) To minimize the impact of air turbulence and stratification on
performance, a duct smoke detector should be located as far as
possible downstream from any obstruction (i.e. deflector plates,
elbows, dampers, etc.). In all situations, confirmation of veloci­ty and pressure differential within specifications is required.

The pressure differential between the input sampling (high
pressure) tube and exhaust (low pressure) tube for the SL-2000
Series smoke duct detector should be greater than 0.01 inches
of water and less than 1.2 inches of water.

3) Identify a code compliant location (supply or return side, or
both) for the installation of the duct unit that will permit easy
access for viewing and serviceability.

4) When installing on the return side, install duct units prior to the
air being exhausted from the building or diluted with outside
“fresh” air.

5) When installing duct smoke units downstream of filters, fires
occurring in the filters will be detected, but if the filters become
blocked, insufficient air flow through the duct unit will prevent
the correct operation of the duct detector. Duct units installed in
the supply air side may monitor upstream equipment and/or
filters.

6) Where possible, install duct detectors upstream of air humidi­fiers and downstream of dehumidifiers.

7) To prevent false alarms, the duct detector should not be mount­ed in areas of extreme high or low temperatures, in areas where
high humidity exists, or in areas where the duct may
contain gases or excessive dust.

SAMPLING TUBE ASSEMBLY

The SL-2000 Series duct smoke detectors employ a specially
notched sampling tube, which may be ordered separately in one of
four standard lengths.

STN-1.0 For duct widths of 6” TO 1.0’
STN-2.5 For duct widths of 1.0’ TO 3.0’
STN-5.0 For duct widths of 3.0’ TO 5.0’
STN-10.0 For duct widths of 5.0’ TO 10.0’

Standard sampling tubes are steel tubes with air intake holes
drilled the entire length of the tube. These tubes can be cut to
length and must span at least 80% the width of the duct. Sampling
tubes over 3.0’ must be supported on the opposite side of the duct.
To ensure the correct operation of the sensing tube, the red end
cap (red stopper in installation kit) must be inserted in the end of
the air intake sampling tube. For custom duct widths, always use
the next longest standard size and cut down to the exact require­ment.

MECHANICAL INSTALLATION

“NO-TOOLS” TUBE INSTALLATION

The SL-2000 Series duct smoke detector provides a unique,
atent-pending mechanism for installation and/or removal of the
sampling and exhaust tubes from either the front or rear of the
detector housing.

Once the air flow direction has been determined, insert the inlet
and exhaust tubes into the duct smoke detector. If the cover is in
place, the tubes may be inserted into the back of the detector via
the key-slots provided. Simply push the tube into place against the
spring loaded retainer, and turn into the correct position, allowing
the key to “lock” the tube in the desired orientation. For front side
installation, simply rotate the tube retainer until the tube may be
inserted and oriented properly. Once the tube is installed, rotate
the retainer back into place to lock down the tube. Ensure air
intake sampling tube is positioned so that the inlet holes are
directly facing the air flow.

DUCT PREPARATION

Remove mounting template from the installation kit. Remove
paper backing from the mounting template and affix it to the duct
at the desired location. Using the template as a guide, drill (2)
mounting holes, 3/32” (2.5mm) for the #12 x ½” sheet metal
screws packaged in the installation kit. Drill or punch (2) 1¼”
(32mm) holes for inlet sampling and exhaust tubes, using the
template as a guide. Clean all holes.

MOUNTING

After securing the sampling and exhaust tubes to the duct smoke
unit, (or initially placing the tubes through the 1¼” holes drilled or
punched in the HVAC duct to accept the inlet sampling and
exhaust tubes and then attaching them to the duct unit), hold the
duct unit assembly in position and use (2) # 12 x ½” sheet metal
screws (packaged in the installation kit) to secure the duct smoke
detector to the HVAC duct sheet metal.

AIR SAMPLING VERIFICATION

To ensure correct operation of the duct unit use a Magnehelic
differential pressure gauge, Dwyer 2000 or 4000 Series (or equiv­alent) to determine the differential pressure between the inlet (high
side) and exhaust (low side) tubes. The differential pressure
between the two tubes should be greater than 0.01 inches of water
and less than 1.2 inches of water.

NOTE: Mountings shown
are typical. Detectors can
be installed side, bottom or
top of ducts as long as
proper tube operation and
flow/pressure performance
is maintained.

DUCT WIDTH

EXHAUST TUBE INSTALLED
DOWNSTREAM OF AIR
FLOW. DO NOT INSERT
RED STOPPER.

INSERT RED STOPPER
THIS END OF INLET TUBE.

INLET TUBE HOLES
FACE AIR FLOW.

Tube Support Hole only for Ducts Greater than 3 Feet Wide