INSTALLATION AND MAINTENANCE INSTRUCTIONS
2. Vacuum sensing chamber before using clean, com- [8.2] Power Board replacement
pressed air to loosen and blow out any remaining debris. 1. Disconnect wiring from the terminal block.
2. Remove the two power board mounting screws.
[8.0] Board Replacement
3. Pull gently on the board to remove it.
4. To replace the board, align the board mounting fea-
tures, holes, and the interconnect terminals. Push the
board into place.
A Division of Pittway
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
[8.1] Detector Board Replacement
1. Remove the two detector board mounting screws.
2. Pull gently on the board to remove it.
3. To replace the board, align the board mounting fea- 5. Secure board with the two mounting screws.
tures, holes, and the interconnect terminals. Push the 6. Re-connect wiring to terminal block.
board into place.
DH100ACDC Air Duct Smoke Detector
Before Installing
tacts are available for control panel interface (alarm initia-
Please thoroughly read the System Sensor Guide for Proper tion), HVAC control, and other auxiliary functions. Auxiliary
Use of Smoke Detectors in Duct Applications (I56-473), which relays are also provided for fan shut down or signaling of up
provides detailed information on detector spacing, place- to 9 other detectors in the loop for multiple fan shut down.
ment, zoning, wiring, and special applications. Copies of this These detectors are not designed for 2-wire applications.
manual are available from System Sensor. NFPA Standards 72
For testing, the alarm can be enabled by a magnet acti-
vated test switch or by the optional remote test station.
NOTICE: This manual should be left with the owner/user The duct smoke detector latches into alarm state when an
4. Secure board with the two mounting screws.
[9] Model DH100ACDC Air Duct Smoke Detector Specifications
Temperature:
DH100ACDCP
DH100ACDCI
Humidity:
Air Velocity:
Dimensions:
Weight:
Electrical Specifications
Power supply voltage:
Input capacitance:
Reset voltage:
Reset time (with RTS451):
Reset time (by power down):
Power up time:
and 90A should also be referenced for detailed information.
32° to 131° F
32° to 120° F
0° to 55° C
0° to 49° C
of this equipment.
alarm occurs. A green LED flashes to indicate power, a
red LED signals local alarm indication, and optional ac-
IMPORTANT: This detector must be tested and maintained cessories offer a variety of annunciation capabilities.
10% to 93% R.H. noncondensing
500 to 4000 ft./min.
14.38″ L x 5.5″ W x 2.75″ D
3.75 pounds
2.5 to 20.3 m/sec.
37cm L x 14cm W x 7cm D
1.7 kg
regularly following NFPA 72 requirements. The detector
should be cleaned at least once a year.
The DH100ACDC can be reset by a momentary power in-
terruption, the reset button on the front cover, the control
panel, or remote reset accessory.
[2] Limitations Of Duct Smoke Detectors
WARNING
20-29 VDC
270 µF max.
3.0 VDC min.
.03 to 0.3 sec.
0.6 sec. max.
34 sec. max.
2 to 17 sec.
24 VAC 50-60-Hz
270 µF max.
2.0 VAC min.
.03 to 0.3 sec.
0.6 sec. max.
34 sec. max.
2 to 17 sec.
120 VAC 50-60 Hz 220/240 VAC 50-60 Hz
Table of Contents
Page
N/A
N/A
[1] General Description
[2] Limitations of Duct Smoke Detectors
1
1
10 VAC min.
.03 to 0.3 sec.
0.6 sec. max.
34 sec. max.
2 to 17 sec.
20 VAC min.
.03 to 0.3 sec.
0.6 sec. max.
34 sec. max.
2 to 17 sec.
[3] Exploded View of Duct Smoke Detector Components 2
The National Fire Protection Association has established
that DUCT DETECTORS MUST NOT BE USED AS A SUB-
STITUTE FOR OPEN AREA DETECTOR PROTECTION as a
means of providing life safety. Nor are they a substitute for
early warning in a building’s regular fire detection system.
[4] Contents of the Duct Smoke Detector Kit
[5] Installation Sequence
2
2
Alarm response time:
Sensitivity Test:
[6] Duct Smoke Detector Maintenance and Test Procedures 5
See detector label See detector label
See detector label
See detector label
[7] Detector Cleaning Procedures
[8] Board Replacement
[9] Specifications
7
8
8
8
Power Supply Voltage
20 - 29 VDC
24 VAC 50 - 60 Hz
120 VAC 50 - 60 Hz
220/240 VAC 50 - 60 Hz
System Sensor supports this position and strongly recommends
that the user read NFPA Standards 90A, 72, and 101. The
DH100ACDC Air Duct Smoke Detectors are listed per UL 268A.
CURRENT REQUIREMENTS (USING NO ACCESSORIES)
Max. standby current
Warranty
15 mA
70 mA
35 mA RMS
25 mA RMS*
35 mA RMS*
15 mA RMS*
25 mA RMS*
[1] General Description
Max. alarm current
125 mA RMS
WARNING
An HVAC system supplies conditioned air to virtually every
area of a building. Smoke introduced into this air duct sys-
tem will be distributed to the entire building. Smoke detec-
tors designed for use in air duct systems are used to sense
the presence of smoke in the duct.
CONTACT RATINGS
This device will not operate without electrical power.
Fire situations may cause an interruption of power. The
system safeguards should be discussed with your local fire
protection specialist.
ACCESSORY CURRENT LOADS AT 24 VDC
Alarm initiation contacts (SPST)
Alarm auxiliary contacts (DPDT)
2.0A @ 30 VDC (resistive)
ALARM
DEVICE
APA451
PA400
STANDBY
12.5mA Max.
0mA
30mA Max.
15mA Max.
10mA Max.
7.5mA Max.
10A @ 30 VDC
10A @ 250 VAC
RA400Z
0mA
Note: Alarm auxiliary contacts must switch 100 mA minimum at 5VDC. Alarm auxiliary contacts shall not be
connected to inititaing circuits of control panels. Use the alarm initiation contact for this purpose.
RTS451/ RTS451KEY 12mA
WARNING
* NOTE: When a unit is powered at the 120VAC or 220/240VAC input, any
combination of accessories may be used such that the given accessory loads are:
60 mA or less in the standby state,
Model DH100ACDC Air Duct Smoke Detectors are supplied
as an ionization model or photoelectronic model. These
two smoke detection methods are combined with an effi-
cient housing design that samples air passing through a
duct and allows detection of a developing hazardous condi-
tion. When sufficient smoke is sensed, an alarm signal is
initiated at the fire control panel monitoring the detector,
and appropriate action can be taken to shut off fans, blow-
ers, change over air handling systems, etc. These actions
can facilitate the management of toxic smoke and fire gases
throughout the areas served by the duct system.
Trouble contacts (SPDT)
2.0A @ 30 VDC (resistive)
This device will not sense smoke unless the ventilation sys-
tem is operating and the cover is installed.
110 mA or less in the alarm state.
Three-Year Limited Warranty
WARNING
System Sensor warrants its enclosed air duct smoke detector to be free
from defects in materials and workmanship under normal use and service
for a period of three years from date of manufacture. System Sensor makes
no other express warranty for this air duct smoke detector. No agent, rep-
resentative, dealer, or employee of the Company has the authority to in-
crease or alter the obligations or limitations of this Warranty. The
Company’s obligation of this Warranty shall be limited to the repair or re-
placement of any part of the air duct smoke detector which is found to be
defective in materials or workmanship under normal use and service dur-
ing the three year period commencing with the date of manufacture. After
phoning System Sensor’s toll free number 800-SENSOR2 (736-7672) for a
Return Authorization number, send defective units postage prepaid to:
System Sensor, Repair Department, RA #__________, 3825 Ohio Avenue,
St. Charles, IL 60174. Please include a note describing the malfunction and
suspected cause of failure. The Company shall not be obligated to repair
or replace units which are found to be defective because of damage, un-
reasonable use, modifications, or alterations occurring after the date of
manufacture. In no case shall the Company be liable for any consequential
or incidental damages for breach of this or any other Warranty, expressed
or implied whatsoever, even if the loss or damage is caused by the
Company’s negligence or fault. Some states do not allow the exclusion or
limitation of incidental or consequential damages, so the above limitation
or exclusion may not apply to you. This Warranty gives you specific legal
rights, and you may also have other rights which vary from state to state.
For this detector to function properly, it MUST be installed
according to the instructions in this manual. Furthermore,
the detector MUST be protected from the elements and op-
erated within ALL electrical and environmental specifica-
tions listed in this manual. Failure to comply with these
requirements may prevent the detector from activating
when smoke is present in the air duct.
DH100ACDC detectors are designed to operate on 24 VDC/
VAC, 120 VAC, or 240 VAC. Alarm and supervisory relay con-
D100-68-00
D100-68-00
8
I56-1147-07
1
I56-1147-07
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housing to the duct.
CAUTION: Do not overtighten the screws.
must be supported at the end opposite the duct detector.
2. Slide the tube into the housing bushing that meets the
air flow first. Position the tube so that the arrows point
into the air flow.
3. Secure the tube flange to the housing bushing with two
#6 self-tapping screws.
4. For tubes longer than the width of the air duct, the tube
should extend out of the opposite side of the duct. If
there are more than 2 holes in the section of the tube ex-
tending out of the duct, select a different length using
Table 1. Otherwise, trim the end of the tube protruding
through the duct so that 1″ to 2″ of the tube extend out-
side the duct. Plug this end with the end plug and tape
closed any holes in the protruding section of the tube. Be
sure to seal the duct where the tube protrudes.
Figure 7. System wiring diagram for 4-wire duct smoke detectors (detectors powered from initiating circuit):
CAUTION
Figure 3. Installation of foam gaskets over sampling
Do not loop wire under terminals when wiring detectors. Break wire runs to provide system supervision of connections.
tube bushings:
SCREW HOLES FOR
ATTACHING HOUSING
TO DUCT WORK.
AVAILABLE POWER INPUTS
10
AVAILABLE POWER INPUTS
CONNECT POWER SOURCE
TO APPROPRIATE TERMINALS
OF EACH DETECTOR. SEE
SPECIFICATIONS FOR
ADDITIONAL POWER SUPPLY
INFORMATION.
POWER INPUTS ACCEPT
24 VDC, 24 VAC 50-60 HZ,
120 VAC 50-60 HZ, OR
9
A
B
C
9
10
A
B
C
220/240 VAC 50-60 HZ.
CONNECT POWER SOURCE
TO APPROPRIATE TERMINALS
OF EACH DETECTOR.
120
VAC
120
24V
24V
VAC
220/240
VAC
220/240
VAC
FOR WIRING OF AUXILIARY
DEVICES, REFER TO
MANUFACTURER’S
ALARM AUXILIARY CONTACTS
FOR FAN SHUTDOWN, ETC.
ALARM AUXILIARY CONTACTS
FOR FAN SHUTDOWN, ETC.
INSTALLATION INSTRUCTIONS
OR CONTACT MANUFACTURER.
16
6
17
7
18
8
16
6
17
7
18
8
AUX. CONTACT RATINGS
10A @ 30 VDC RESISTIVE
10A @ 250 VAC
NOTE: THE SUPERVISORY RELAY NOW
PROVIDES A "FORM C" CONTACT FOR
CUSTOMIZED APPLICATIONS.
FOR STANDARD APPLICATIONS, ONLY
THE "NO" CONTACT IS USED
100mA MINIMUM @ 5 VDC
NOT INTENDED FOR
CONNECTION TO CONTROL
PANELS.
N.C.
C.
N.O.
N.O.
C.
N.C.
N.C.
C.
N.O.
N.O.
C.
N.C.
A78-2045-00
[5.4] Sampling Tube Installation for Ducts Greater
Than 11/2 Feet Wide
ALARM AUXILIARY CONTACTS SHOWN IN
STANDBY. CONTACTS TRANSFER DURING
ALARM AS INDICATED BY THE ARROWS.
ALARM AUXILIARY CONTACTS SHOWN IN
STANDBY. CONTACTS TRANSFER DURING
ALARM AS INDICATED BY THE ARROWS.
Figure 4. Air duct detector inlet sampling tube:
The sampling tube is identified by a series of air inlet holes
on the tube. A telescoping tube is included for ducts up to
18″ in width. All other lengths must be purchased sepa-
rately. Order the correct length, as specified in Table 1, for
width of the duct where it will be installed. The exhaust
tube is molded onto the base of the duct housing, and the
A2440-00 Exhaust Tube Extension is available as an acces-
sory in those cases where the molded exhaust port does not
extend at least 2 inches into the duct.
SUPERVISORY TROUBLE CONTACTS
SUPERVISORY TROUBLE CONTACTS
TROUBLE CONTACT RATING
2.0 A @ 30 VDC resistive
3
14
3
14
AIR HOLES
INLET
TUBE
END
FLANGE
TROUBLE CONTACTS CLOSED IN ALARM AND STANDBY.
CONTACTS OPEN WHILE DETECTOR HEAD OR POWER IS
REMOVED OR WHEN TAMPER FEATURE TIMES OUT. OPEN
CONTACTS SIGNAL TROUBLE CONDITION TO PANEL.
TROUBLE CONTACTS CLOSED IN ALARM AND STANDBY.
CONTACTS OPEN WHILE DETECTOR HEAD OR POWER IS
REMOVED OR WHEN TAMPER FEATURE TIMES OUT. OPEN
CONTACTS SIGNAL TROUBLE CONDITION TO PANEL.
PLUG
+
4
4
ALARM
INITIATION
CONTACTS
CONTACTS SHOWN
OPEN IN STANDBY.
CONTACTS CLOSE
IN ALARM.
ALARM
INITIATION
CONTACTS
CONTACTS SHOWN
OPEN IN STANDBY.
CONTACTS CLOSE
IN ALARM.
ALARM
INITIATION
LOOP
ARROWS
MUST FACE
INTO AIR FLOW
AIR FLOW DIRECTION
5
5
A78-2047-00
The inlet tube is always installed with the air inlet holes
facing into the air flow. To assist proper installation, the
tube’s mounting flange is marked with arrows. Make sure
the inlet tube is mounted so that the arrows point into the
air flow (see Figure 4). Figure 5 shows the various combi-
nations of tube mounting configurations with respect to air
flow. Mounting the detector housing in a vertical orienta-
tion is acceptable, provided that the air flows directly into
the sampling tube holes as indicated in Figure 4.
—
Figure 5. Tube mounting configurations with varying
air flow direction:
EOL RESISTOR
UL LISTED 4-WIRE
CONTROL PANEL
FIRST DETECTOR IN THE LOOP
DH100ACDC
LAST DETECTOR IN THE LOOP
DH100ACDC
SPECIFIED BY
PANEL MANUFACTURER
DOTS INDICATE POSITION OF
SAMPLING TUBE HOLES
A78-2352-03
AIR FLOW
AIR FLOW
DIRECTION
DIRECTION
Figure 8. Wiring diagram for DH100ACDC to APA451:
Figure 9. Wiring diagram for DH100ACDC to
RTS451KEY and interconnect feature:
DUCT
DUCT
DETECTOR
DETECTOR
HOUSING
HOUSING
DH100ACDC
Alarm Signal
RTS451KEY
B.
A.
DH100ACDC
Alarm Signal
APA451
Alarm
INLET
TUBE
EXHAUST
TUBE
EXHAUST
TUBE
INLET
TUBE
(Red LED) Alarm
(Green LED) Power
Common
1
6
2
3
4
5
15
19
14
3
2
3
15
19
14
3
AIR FLOW
DIRECTION
Aux. Power +
Sup. N. O.
INLET
TUBE
EXHAUST
TUBE
Aux. Power +
Sup. N. O.
Table 1. Inlet tubes required for different duct
widths:
Power
DUCT
DETECTOR
HOUSING
DUCT
DETECTOR
HOUSING
Outside Duct Width
1 to 2 ft.
Inlet Tube Required
Sup. COM
Sup. COM
Reset
ST-1.5
ST-3
Aux. Power –
Reset
20
2
Common
1
Aux. Power –
20
Common
2 to 4 ft.
D.
C.
4 to 8 ft.
ST-5
Test
INLET
TUBE
EXHAUST
TUBE
AIR FLOW
DIRECTION
8 to 12 ft.
ST-10
Test
11
12
1
NOTE: Wiring diagram shown is for DH100ACDC 4-wire duct
smoke detector system equipped without a control panel.
NOTE: Orientations C and D apply only to metal sampling tubes.
Interconnect +
Interconnect –
NOTE: Wiring diagram shown is for
DH100ACDC 4-wire duct smoke
detector system equipped
[5.4.1] Installation For Ducts Greater Than 11/2 Feet
But Less Than 8 Feet Wide
WARNING
without a control panel.
In no case should more than 2 air inlet holes be cut off the
tube. There must be a minimum of 10 holes in the tube ex-
posed to the air stream.
1. If the tube is longer than the width of the air duct, drill a
DH100ACDC
Unit Two
3
12
1
/4″ hole in the duct opposite the hole already cut for the
IMPORTANT!
ALL INTERCONNECTED
UNITS MUST BE POWERED
BY THE SAME,
INDEPENDENT POWER
SUPPLY.
inlet tube. Make sure the hole is 1″ to 2″ below the inlet
hole on the opposite side of the duct to allow moisture
drainage away from the detector. If the tube is shorter than
the width of the air duct, install the end plug into the inlet
tube as shown in Figure 4. Sampling tubes over 3 ft. long
[5.4.2] Installation For Ducts More Than 8 Feet Wide
NOTE: To install inlet tubes in ducts more than 8 feet wide,
D100-68-00
6
I56-1147-07
D100-68-00
3
I56-1147-07
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work must be performed inside the air duct. Sampling as evenly as possible over the length of the tube.
of air in ducts wider than 8 feet is accomplished by
using the ST-10 inlet sampling tube. If the tube is NOTE: This procedure should only be used as a temporary
Smoke detectors and alarm system control panels have haust and inlet tube holes to prevent ducted air from carry-
specifications for allowable loop resistance. Consult the ing smoke away from the detector head, then blow smoke
control panel manufacturer’s specifications for the total such as cigarette, cotton wick, or punk directly at the head
loop resistance allowed for the particular model control to cause an alarm. REMEMBER TO REMOVE THE PLUGS
shorter than the width of the air duct, install the end
plug into the inlet tube as shown in Figure 4 and sup-
port the end opposite the duct smoke detector.
fix. It is not intended as a permanent substitute for
ordering the correct length tubes.
panel being used before wiring the detector loop.
AFTER THIS TEST, OR THE DETECTOR WILL NOT FUNC-
TION PROPERLY.
[5.5] Install The Filters
To install the sampling tube filters, simply push the filters
Wiring Instructions
Install the inlet tube as follows:
The DH100ACDC detectors are designed for easy wiring. [6.1.3] Filter Replacement
1. Drill a 3/4-inch hole in the duct directly opposite the hole into the sampling and exhaust tube holes, as shown in Fig-
already drilled for the inlet tube. Make sure the hole is 1 ure 6. If a metal sampling tube is used, install the filters
to 2″ below the inlet hole on the opposite side of the over the tube ends.
duct to allow for moisture drainage.
The housing provides a terminal strip with clamping The filters do not substantially affect smoke performance
plates. Wiring connections are made by stripping about even when up to 90% of the filter is clogged. Quarterly vi-
3
/
8-inch of insulation from the end of the wire, sliding sual inspection usually suffices to determine whether the
the bare end under the plate, and tightening the clamp- filters should be replaced because only a high percentage of
2. Slide the inlet tube with the flange into the housing Figure 6. Sampling tube filter installation:
bushing that meets the air flow first. Position the tube so
ing plate screw.
contamination affects performance. If further testing is re-
quired, compare differential pressure readings with and
without the filters installed. If the difference exceeds 10%
that the arrows point into the air flow. Secure the tube
[5.7] Perform Detector Check
flange to the housing bushing with two #6 self-tapping
1. Perform STANDBY AND TROUBLE TEST per Section replace the filters. In no case should the pressure differen-
screws.
[6.2.1].
tial fall below 0.03 inches of water.
3. From inside the duct, couple the other sections of the in-
let tube to the section already installed using the 1/2-inch
2. Perform MAGNET TEST per Section [6.2.2.1]. The
RTS451 test of Section [6.2.2.2] may substitute for this [6.2] Standby, Alarm, And Sensitivity Tests
conduit fittings supplied. Make sure that the holes on
requirement.
[6.2.1] Standby And Trouble
both of the air inlet tubes are lined up and facing into
the air flow.
4. Trim the end of the tube protruding through the duct so
3. Perform AIR FLOW TEST per Section [6.1.1].
4. Perform SMOKE RESPONSE TEST per Section [6.1.2].
5. Perform SENSITIVITY TEST per Section [6.2.3].
Standby — Look for the presence of the flashing green
LED through the transparent housing cover.
The LED should flash approximately every
10 seconds.
A78-2106-01
that 1 to 2″ of the tube extend outside the duct. Plug this
end with the end plug and tape closed any holes in the
protruding section of the tube. Be sure to seal the duct
[5.8] Install The Cover
CAUTION
Install the cover using the four screws that are captured in Trouble — If the detector LED does not flash, then the
Filters require periodic cleaning or replacement, depending
on the amount of dust and dirt accumulated. Visually in-
spect the filters at least quarterly; inspect them more often
if the dust accumulation warrants it. See Section [6] for
more information. Replacement filters can be ordered from
System Sensor, 3825 Ohio Ave., St. Charles, IL 60174. (Ex-
haust tube/intake tube filter P/N F36-09-00)
when the tube protrudes.
the housing cover. Be certain filters are installed as speci-
fied in Section [5.5]. Make sure that the cover fits into the
base groove and that all gaskets are in their proper posi-
tions. Tighten the four screws.
detector lacks power (check wiring, panel, or
power supply), the detector board is missing
(replace), or the unit is defective (return for
repair)
NOTE: An alternate method to using the ST-10 is to use
two ST-5 inlet tubes. Remove the flange from one
of the tubes and install as described above. After
the installation, use electrical tape to close off
some of the sampling holes so that there are a total
of 10 to 12 holes spaced as evenly as possible
across the width of the duct.
[6] Duct Smoke Detector Maintenance And Test
Procedures
Test and maintain duct detectors as recommended in NFPA
72. The tests contained in this manual were devised to as-
sist maintenance personnel in verification of proper detec-
tor operation.
Test —
Cover
The trouble condition can be caused inten-
tionally to verify correct operation of the sys-
tem. Remove the detector board to cause a
trouble condition locally and at the system
control panel.
[5.6] Field Wiring
Wiring Installation Guidelines
NOTE: Air currents inside the duct may cause excessive
vibration, especially when the longer sampling
tubes are used. In these cases a 3 inch floor flange
(available at most plumbing supply stores) may be
used to fasten the sampling tube to the other side
of the duct. When using the flange/connector
mounting technique, drill a 1-inch to 11/4-inch hole
where the flange will be used.
All wiring must be installed in compliance with the Na-
tional Electrical Code and the local codes having jurisdic-
tion. Proper wire gauges should be used. The conductors
used to connect smoke detectors to control panels and ac-
cessory devices should be color-coded to prevent wiring
mistakes. Improper connections can prevent a system from
responding properly in the event of a fire.
Tamper — If the cover is removed for a period longer
than 20 minutes, a trouble signal is generated
to indicate the cover is missing.
Before conducting these tests, notify the proper authorities
that the smoke detection system will be temporarily out of
service. Disable the zone or system under test to prevent
unwanted alarms.
[6.2.2] Alarm Tests
[6.2.2.1] M02-04-00 Magnet Test
1. Place the painted surface of the magnet onto the TEST
locator on the bottom of the housing (Figure 11).
[6.1] Smoke Entry Tests
[6.1.1] Air Flow
For signal wiring, (the wiring between interconnected de-
tectors or from detectors to auxiliary devices), it is usually
recommended that single conductor wire be no smaller
than 18 gauge. The duct smoke detector terminals accom-
modate wire sizes up to 12 gauge. The last foot of conduit
should be flexible conduit (available in electrical supply
houses), which facilitates easier installation and puts less
strain on the conduit holes in the housing. Solid conduit
connections may be used if desired.
[5.4.3] Modifications of Inlet Sampling Tubes
There may be applications where duct widths are not what
is specified for the installation. In such cases, it is permis-
sible to modify an inlet sampling tube that is longer than
necessary to span the duct width.
To verify sufficient sampling of ducted air, use a manometer 2. The red alarm LED on the detector should latch on, as
to measure the differential pressure created from air flow
across the sampling tubes. The pressure should measure no
less than 0.03 inches of water and no greater than 1.4 inches
of water. The air handler must be operating for this test.
should any accessories (i.e. RA400Z, RTS451). Verify
system control panel alarm status and control panel ex-
ecution of all intended auxiliary functions (i.e. fan shut-
down, damper control, etc.).
3. The detector must be reset by system control panel, front
cover reset button, or remote accessory.
Use a 0.193-inch diameter (#11) drill and add the appropriate
number of holes so that the total number of holes exposed to
the air flow in the duct is 10 to 12. Space the additional holes
[6.1.2] Smoke Response
To determine if smoke is capable of entering the sensing
chamber, visually identify any obstructions. Plug the ex-
D100-68-00
4
I56-1147-07
D100-68-00
5
I56-1147-07
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