Apollo America SM-501-N, SM-501-P Installation Manual
INST AP-191 B060405
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AIR PRODUCTS
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SM-501-N 4-Wire, Ionization Type
SM-501-P 4-Wire, Photoelectric Type
AIR PRODUCTS AND CONTROLS INC.
INSTALLATION AND MAINTENANCE INSTRUCTIONS
FOR SM-501 SERIES DUCT SMOKE DETECTORS
PRODUCT OVERVIEW
PRODUCT APPLICATION
SM-501 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 SM-501 Series smoke detector is fitted with a mounting base that
will accept an ionization smoke detector head model 55000-225APO
(or 55000-250APO) or photoelectric smoke detector head model
55000-328APO (or 55000-350APO). The duct unit supports two sets
of form “C” alarm contacts and one form “C” trouble contact. The trouble contact supervises the presence of the input power and removal
of the detector head.
**
THE TROUBLE CONTACTS (TERMINALS 13-14-15) ARE
SHOWN IN THE NON-ENERGIZED CONDITION. IN NORMAL
OPERATION, CONTACTS WILL BE REVERSED.
The trouble contacts will not
operate in the event of a smoke alarm.
The SM-501 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 airflow) 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 500 to 4,000 feet per
minute. To verify correct installation, the pressure 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 SM-501
Series duct units by connecting to DC voltage output terminals 16
through 21. 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.
SM-501 AT-A-GLANCE
MODEL NUMBER:
SM-501-N 4-Wire Ionization Duct Smoke Detector
SM-501-P 4-Wire Photoelectric Duct Smoke Detector
DETECTOR HEAD MODEL NUMBER:
Ionization Detector Head: 55000-225APO
Photoelectric Detector Head: 55000-328APO
PO
WER REQUIREMENTS:
STANDBY CURRENT ALARM CURRENT
24VAC 35.0mA 24VAC 74.0mA
24VDC 15.0mA 24VDC 56.0mA
115VAC 25.0mA 115VAC 32.0mA
230VAC 12.0mA 230VAC 16.0mA
RELAY CONTACT RATINGS:
Alarm contacts: 2 Sets form “C” rated at 10A @ 115VAC resistive
Trouble contacts: 1 Set form “C” rated at 10A @ 115VAC resistive
Air velocity: 500 to 4,000ft/min.
Ambient temperature:SM-501-N: 32°F to 158°F (0°C to 70°C)
SM-501-P: 32°F to 140°F (0°C to 60°C)
Humidity: 10% to 85% RH Non-Condensing/Non-Freezing
Material: 18GA steel back box, clear plastic cover
(Makrolon 94V-0)
Finish: Gray paint on black box
Dimensions: 9 1/8” L X 7 1/4” W X 2 1/4” H
Max. net wt.: 3 1/2 lbs.
Radioactive element: SM-501-N (Ionization) - Americium 241,
0.9 micro curie.
Do not expose to corrosive atmospheres.
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INST AP-191 B060405
LOCA
TION 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 SM-501 Series duct smoke detector, the
following factors must be considered.
1) A uniform non-turbulent (laminar) airflow between
500 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
SM-501 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
Sampling tubes are to be ordered separately in one of four standard lengths.
STS-1.0 For duct widths of 6” TO 1.0’
STS-2.5 For duct widths of 1.0’ TO 2.5’
STS-5.0 For duct widths of 2.5’ TO 5.0’
STS-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 must be cut to
length and should span the entire width of the duct. Sampling
tubes over 3.0’ must be supported on the opposite side of the duct.
MECHANICAL INSTALLATION
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.
Once the airflow direction has been determined, insert the inlet
and exhaust tubes into the sampling tube connectors fitted to the
back of the duct smoke detector which are equipped with set
screws. These connectors will allow the tubes to be correctly orientated and secured by tightening the set screw. Ensure air
intake sampling tube is positioned so that the inlet holes are
directly facing the airflow.
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 (4)
mounting holes (3/32” diam.) for the # 12 X 1/2” sheet metal
screws packaged in the installation kit. Drill or punch (2) 1 3/8”
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 1 3/8” 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 (4) # 12 X 1/2” 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.
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