Siemens AD2-P User manual

Air Duct Monitoring Housings
Installation Instructions
ModelsAD2-P,AD2-PR andAD2-XHR
INTRODUCTION Models AD2-P, AD2-PR and AD2-XHR (AD2 Series) from
Siemens Industry, Inc., are air duct monitoring housings
containing sampling tubes. When used with a compatible
smoke detector, smoke and combustion products are
detected for shutdown of the duct system and/or operation
of supplementary equipment as provided by the system
control panel. See the following chart for usage.
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TECHNICAL DATA AIR DUCT CONDITIONS
Temperature Range:
32OF (0OC) - 100OF (38OC) per UL 268/268A
Altitude Range:
AD2-P, AD2-PR and AD2-XHR — No altitude limitations
Relative Humidity Range:
10-85% (non-condensing/non-freezing)
Air Duct Velocity Range:
100-4000 ft/min – AD2-P, AD2-PR and AD2-XHR
Sampling Tube Pressure Range of Differences:
Greater than 0.01 and less than 1.2 inches of water column
These air duct detectors are designed for detection and
control of products of combustion in a duct system. TheyThey
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are not to be used forare not to be used for
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DO NOT USE air duct detectors with Alarm Verification.
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P/N 315-049708-6

P/N 315-049708-5
Siemens Industry, Inc.
Building Technologies Division 2
ASSEMBLY This detector has a cover tamper (removal) switch. Care
should be taken when installing the cover. Squarely place the
cover on the unit to aviod possible damage to the switch.
DO NOT SLIDE COVER INTO POSITION.
APPLICATION The AD2 Series duct smoke detectors provide early detec-
tion of smoke and products of combustion present in air
moving through an HVAC duct supply, return, or both.These
devices are designed to prevent the recirculation of smoke in
areas by the air handling system’s fans and blowers. Com-
plete systems may be shut down in the event of smoke
detection.
For the correct installation of a duct smoke unit please refer
to NFPA 72 (National Fire Alarm Code), NFPA 90A (Standard
for Installation of Air Conditioning and Ventilation Systems)
and NFPA 92A (Recommended Practice for Smoke Control
Systems).
OPERATION When the Models AD2-P, AD2-PR and AD2-XHR are operat-
ing, a sample of air is drawn from the duct and passed
through the sampling chamber by means of the input
sampling tube. The air sample passes through the smoke
detector mounted in the duct housing and is exhausted back
into the duct through the outlet tube.
This detector is equipped with cover removal switch (SW1)
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 normal
operation.
LED Indicator The AD2-P, AD2-PR and AD2-XHR contain an LED indicator
(located on the smoke detector) capable of flashing either one
of three distinct colors: green, yellow, or red. During each flash
interval, the microprocessor based detector checks the
following:
• for smoke in its sensing chamber
• that its critical smoke sensing electronics are operating.

Siemens Industry, Inc.
Building Technologies Division 3 P/N 315-049708-5
Figure 2
Recommended Locations in Duct Systems
RETURN
AIR
SUPPLY
AIR
AIR DUCT
HOUSING
AIR DUCT
HOUSING
DAMPER
BLOWER
FILTER
PLENUM
FRESH AIR INTAKE
DAMPER
TYPE A: CLOSED SYSTEM - NO EXHAUST
D D
TYPE B: PROVISION FOR EXHAUSTING
SOME PERCENTAGE OF RETURN AIR
RETURN
AIR
SUPPLY
AIR
AIR DUCT
HOUSING
AIR DUCT
HOUSING
DAMPER
DAMPER
BLOWER
FILTER
PLENUM
FRESH AIR INTAKE
DAMPER
D D
EXHAUST AIR
OUTPUT
DAMPER
TYPE C: RETURN AIR UNDER POSITIVE PRESSURE
FROM SEPARATE BLOWER
EXHAUST AIR
OUTPUT
DAMPER
RETURN
AIR
SUPPLY
AIR
AIR DUCT
HOUSING
RETURN AIR
BLOWER
AIR DUCT
HOUSING
DAMPER
DAMPER
BLOWER
FILTER
PLENUM
FRESH AIR INTAKE
DAMPER
D D
Figure 1
Typical Mounting of Duct Housing
OUTLET
TUBE
INPUT
SAMPLING
TUBE
CENTER
LINE
OF DUCT
C
L
Based on the results of these checks, the LED indicator
flashes as follows:
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P/N 315-049708-5
Siemens Industry, Inc.
Building Technologies Division 4
MOUNTING THE AIR DUCT HOUSING
Location on Duct System
This guideline contains general information on duct smoke
detector installation, but does not preclude the NFPA
documents listed. Siemens Industry, Inc. assumes no
responsibility for improperly installed duct detectors. To
determine the correct installation position for an AD2 Series
duct smoke detector, the following factors must be consid-
ered.
1) A uniform non-turbulent (laminar) airflow 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 stratifica-
tion on performance, a duct smoke detector should be
located as far as possible downstream from any obstruc-
tion (i.e. deflector plates, elbows, dampers, etc.). In all
situations, confirmation of velocity and pressure differen-
tial within specifications is required.
The pressure differential between the input sampling
(high pressure) tube and outlet (low pressure) tube for
the AD2 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.

Siemens Industry, Inc.
Building Technologies Division 5 P/N 315-049708-5
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.
Duct Preparation The AD2 Series Housings come with an installation kit that
contains the following items:
• Short return (outlet) sampling tube
• Stopper
• Two #12 x 3/4” sheet metal screws
• Mounting template (packaged separately)
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 3/4”
sheet metal screws packaged in the installation kit. Drill or
punch (2) 1¼” (32mm) holes for input sampling and outlet
tubes, using the template as a guide. Clean all holes.
Sampling Tube Installation
The AD2 Series duct smoke detectors use a specially
notched sampling tube, which may be ordered separately in
one of four standard lengths.
ST-10 For duct widths of 6" to 1.0’
ST-25 For duct widths of 1.0’ to 3.0’
ST-50 For duct widths of 3.0’ to 5.0’ (requires support)
ST-100* For duct widths of 5.0’ to 10.0’ (requires support)
*This model is supplied as two 5 ft. sections with a coupling.
Assembly is required for installation.
Each model is manufactured with a different number and
size of sampling holes. Only the specific tube must be used
for the specified duct width.
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, the red
stopper (stopper in installation kit) must be inserted in the
end of the air input sampling tube. If the input tube protrudes
through the opposite side of the duct, the opening around

P/N 315-049708-5
Siemens Industry, Inc.
Building Technologies Division 6
the tube must be sealed. 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 (refer to
Figure 3), insert the input and outlet tubes into the duct
housing.
1. Remove the cover from the housing.
2. Loosen the screw and rotate the tube retainer until the
input tube is inserted and oriented properly. Ensure that
the notched end of the tube is inside the housing and
that the air input sampling tube is positioned so that the
input holes are directly facing the airflow.
3. Once the tube is installed, rotate the retainer back into
place and tighten screw.
4. Install the outlet tube in the remaining position. Once
the tube is installed, rotate the retainer back into place
and tighten screw.
Mounting After securing the input and outlet 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 input and
outlet tubes and then attaching them to the duct unit), hold
the duct unit assembly in position and use (2) # 12 X 3/4”
sheet metal screws (packaged in the installation kit) to
secure the duct smoke detector to the HVAC duct sheet
metal.
INPUT TUBE HOLES
FACE AIR FLOW
INSERT RED STOPPER
THIS END OF INPUT TUBE
OUTLET TUBE INSTALLED
DOWNSTREAM OF AIRFLOW
DO NOT INSERT RED STOPPER
AIR FLOW DIRECTION
DUCT WIDTH
TUBE SUPPORT ONLY FOR DUCTS GREATER THAN 3 FEET WIDE
NOTE: Mountings shown
are typical. Detectors can
be installed side, bottom
or top of duct as long as
proper tube operation and
flow/pressure performance
is maintained.
Figure 3
Sampling Tube Orientation

Siemens Industry, Inc.
Building Technologies Division 7 P/N 315-049708-5
Air Duct Sampling Tube Pressure Measurement
The Model PDM-3 Pressure Differential Measuring device
should be used to ensure that the sampling tube pressure
differential is within the specified limits. The differential
pressure between the two tubes should be greater than 0.01
inches of water and less than 1.2 inches of water. Qualified
personnel should take measurements in accordance with
the PDM-3 instructions, P/N 315-085535.
WIRING
Conduit Knockouts Determine knockout size required based upon installation
wiring. Refer to Figure 4. Select knockout and remove by
placing screwdriver at center of knockout and tap with a
hammer until the knockout breaks out. Clean the hole before
installing conduit.
3/4” KNOCKOUTS
1/2” KNOCKOUT
Wiring The AD2-P, AD2-PR and AD2-XHR should be connected as
shown in Figures 5, 6 and 7. Note any limitations on the
number of detectors and restrictions on the use of remote
devices permitted for each circuit.
The AD2-P is used with the PE-11/PE-11C and FP-11/FP-11C.
It is also used with the HFP-11/HFPO-11 detector in the
FireFinder-XLS, FS-250, FC2005, FC2025, FC2050, FC901,
FC922 or FC924 System. The AD2-P is also used with the
SFP-11/SFPO-11 detector in the FS-250C System. The AD2-
XHR must be used for the relay version. Also, all optional
accessories in the same loop must be compatible with the
detector series being used. These devices should be
interconnected as shown in Figure 7 and wired to the DLC,
FS-DLC, FDLC, FCI2016/17-U1, FC2005 or FC901. (Refer to
the DLC Installation Instructions, P/N 315-033090, or the FS-
250 Manual, P/N 315-049353, or the FS-250C Manual, P/N
315-049589C, or the FCI2016/17-U1 Manual, P/N
A6V10315038, or the FC2005 Manual, P/N A6V10333722, or
Figure 4
Removing the Knockouts

P/N 315-049708-5
Siemens Industry, Inc.
Building Technologies Division 8
LOOP WIRES.
SEE COMPATIBLE
CONTROL
EQUIPMENT TABLE.
NO
COM
NC
LOOP WIRES.
SEE COMPATIBLE
CONTROL
EQUIPMENT TABLE.
TO NEXT DETECTOR OR EOL DEVICE
(1A)
TO REMOTE DEVICE
(6)
CNTL
+ -
(5)
-+
+
-
ALARM CONTACTS
125 VAC, 24 VDC, 2.5A
SEE NOTE 2
DEVICE
REMOTE
DEVICE LOOP -
DEVICE LOOP +
LOOP/REM -
DEVICE
CONTROL
NOT USED
LOOP/REM +
MODEL AD2-P
TO NEXT DETECTOR OR EOL DEVICE
+
-
TO SECOND REMOTE DEVICE (SEE MULTIPLE REMOTE DEVICES)
REM+
-
+
REM-
CONTL
REMOTE
ALARM
RELAY
COMNC NO
+
-
CNTL
-
+ +
DEVICE
LOOP
MODEL AD2-PR
NOTE: EOL DEVICE MUST BE COMPATIBLE WITH SYSTEM INITIATING CIRCUIT. OBSERVE PROPER POLARITY WHERE APPLICABLE.
(6)
(5)
(1A)
TB1 TB1
PE-11
PE-11C
PE-11
PE-11C
NOTES: 1. Up to 30 air duct housings can be
installed on one initiating circuit, except as noted in Note 2.
2. When an AD2-PR is used to control a
fire safety function, the AD2-PR must be the ONLY device on the initiating circuit.
3. Do not use looped wire under base
terminal.
4. Break wire run to provide supervision
of connection.
5. The green grounding screw in the
wiring compartment of the air duct housing is not used.
Figure 5 Typical Connections for the AD2-P / AD2-PR Using PE-11 / PE-11C Detectors
If remote devices are supported by the initiating circuit, each detector/base may have up to 2 remote devices with the following configurations and restrictions only:
MULTIPLE REMOTE DEVICES
Remote
Device 1
AD2-P AD2-P
Remote
Device 2
RLC-11, RLW-11
RSAC-11, RSAW-11
Restrictions See Note 2 See Note 2
SEE REMOTE DEVICE INSTRUCTIONS FOR WIRING DETAILS:
DEVICE RLC-11, RLW-11 RSAC-11, RSAW-11
INSTALLATION
INSTRUCTIONS
P/N 315-094925 P/N 315-094926
If the relay contacts are being used to control 120 VAC operated equipment, ensure that the conduit is properly attached to the internal metal ground strap, using the proper conduit locking nuts. Failure to provide proper grounding may result in fatal electrical shock and violation of national and local codes.

Siemens Industry, Inc.
Building Technologies Division 9 P/N 315-049708-5
Figure 6 Typical Connections for the AD2-P / AD2-XHR Using FP-11 / FP-11C Detectors
NOTES: 1. The relay contacts are shown after a reset pulse, which represents the non-alarm condition. 2. The green grounding screw in the wiring compartment of the air duct housing is not used.
- +
DEVICE LOOP -
DEVICE LOOP +
NOT USED
OPTIONAL
REMOTE ALARM
INDICATOR MODEL
RLI-1 OR RLI-2
RED
REMOTE -
REMOTE +
NO
LOOP
DEVICE
++ --
NC
COM
NO
ALARM
RELAY
COM NC
COM
NC
NO
TO NEXT ADDRESSABLE DEVICE -
+
TB1 TB1 TB1
MODEL AD2-P MODEL AD2-XHR MODEL AD2-XHR
FP-11
FP-11C
LOOP WIRES. SEE COMPATIBLE CONTROL EQUIPMENT TABLE.
FP-11
FP-11C
FP-11
FP-11C
ALARM CONTACTS 125 VAC, 24 VDC, 2.5A SEE NOTE 1
ALARM CONTACTS 125 VAC, 24 VDC, 2.5A SEE NOTE 1
NO
LOOP
DEVICE
++ --
ALARM
RELAY
COM NC
NOT USED
If the relay contacts are being used to control 120 VAC operated equipment, ensure that the conduit is properly attached to the internal metal ground strap, using the proper conduit locking nuts. Failure to provide proper grounding may result in fatal electrical shock and violation of national and local codes.

P/N 315-049708-5
Siemens Industry, Inc.
Building Technologies Division 10
Figure 7 Typical Connections for the AD2-P / AD2-XHR Using H-Series and S-Series Detectors
NOTES: 1. The relay contacts are shown after a reset pulse, which represents the non-alarm condition. 2. Refer to the RL-HW / RL-HC Installation Instructions, P/N 315-033230. 3. The green grounding screw in the wiring compartment of the air duct housing is not used.
LINE 2
LINE 1
NOT USED
LINE1OR2
TO REMOTE TB1
OTHER LINE
TO REMOTE TB3
COM
NO
NC
NO
DEVICE
LOOP
OTHER
LINE
LINE
1OR2
RELAY
ALARM
COM NC
COM
NO
NC
TB2
(6 or 5)
TB3
(5 or 6)
TB1
(1A)
TB1 TB1 TB1
MODEL AD2-P MODEL AD2-XHR MODEL AD2-XHR
HFP-11
SFP-11
HFPO-11
SFPO-11
OPTIONAL REMOTE ALARM
INDICATOR MODEL RL-HC OR RL-HW
SEE NOTE 2
LOOP WIRES. SEE COMPATIBLE CONTROL EQUIPMENT TABLE.
HFP-11
SFP-11
HFPO-11
SFPO-11
TO NEXT ADDRESSABLE DEVICE
ALARM CONTACTS 125 VAC, 24 VDC, 2.5A SEE NOTE 1
ALARM CONTACTS 125 VAC, 24 VDC, 2.5A SEE NOTE 1
NO
DEVICE
LOOP
OTHER
LINE
LINE
1OR2
RELAY
ALARM
COM NC
HFP-11
SFP-11
HFPO-11
SFPO-11
TO REMOTE TB2
If the relay contacts are being used to control 120 VAC operated equipment, ensure that the conduit is properly attached to the internal metal ground strap, using the proper conduit locking nuts. Failure to provide proper grounding may result in fatal electrical shock and violation of national and local codes.