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Single-Package Rooftop Units
Accessory Return Smoke Detectors
Installation Instructions
Part No. CRSMKDET002C00
48/50A020-060
48/50Z030-105
CONTENTS
GENERAL
SAFETY CONSIDERATIONS
INSTALLATION
Check Package Contents
Return Air Smoke Detector Installation
48/50A Units
48/50Z Units
Configuring the
OPERATION
MAINTENANCE
Cleaning Procedure
Filter Replacement
Board Replacement
TROUBLESHOOTING
Smoke Entry Tests
• AIRFLOW TEST
• SMOKE RESPONSE TEST
Standby, Alarm and Sensitivity Tests
• STANDBY AND TROUBLE TEST
• ALARM TEST
• SENSITIVITY TEST
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Comfort
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Link™ Controller
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GENERAL
An HVAC (heating, ventilation and air-conditioning) system supplies conditioned air to virtually every area of a
building. Smoke introduced into this air duct system will be
distributed throughout the entire building. Smoke detectors
designed for use inside the unit are used to sense the presence
of smoke passing through the unit.
The smoke detector utilizes photoelectric technology for the
detection of smoke. This detection method, when combined
with an efficient ducting design, samples air passing through
the unit. If sufficient smoke is sensed, an alarm signal is initiated and the ComfortLink controls will shut down the unit. With
the unit shut down, the unit will not blow toxic smoke and fire
gases throughout the areas served by the duct system.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform the basic maintenance
functions of cleaning coils and filters and replacing filters. All
other operations should be performed by trained service personnel. When working on air-conditioning equipment, observe
precautions in the literature, tags and labels attached to the unit,
and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use care when handling and installing the accessory.
Before performing service or maintenance operations on
unit, turn off main power swit ch to unit. Electrical shock
could cause personal injury.
The National Fire Protection Association has established
that DUCT DETECTORS MUST NOT BE USED AS A
SUBSTITUTE 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. Carrier supports this positi on and strongly
recommends that the user read NFPA Standards 90A, 72,
and 101. This smoke detector is listed per UL 2 68A.
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.
This device will not sense smoke unless the ventilation system is operating and the cover is installed.
For this detector to function properly, it MUST be installed
according to the instructions in this manual. Furthermore,
the detector MUST be operated within ALL e lectrical and
environmental specifications listed in this manual. Failure
to comply with these requirements may prevent the detector from activating when smoke is present in the air duct.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 1
Ta b 1 a 1 b
PC 111 Catalog No. 534-80157 Printed in U.S.A. Form 48/50A-5SI Pg 1 9-03 Replaces: New
Page 2
INSTALLATION
Fig. 2 — Smoke Detector Mounting Location for
48/50A020-060
When installing the smoke detector in the unit, follow all
local codes. Damage to unit may result.
Check Package Contents —
aging and inspect shipment for damage. If any damage is
found, file a claim with the shipping agent immediately. If any
item is missing or any part does not assemble properly, notify
your Carrier distributor.
T able 1 lists the accessory package contents. Figure 1 shows
the smoke detector.
Table 1 — Accessory Package Contents — Return
Air Smoke Detector (CRSMKDET002C00)
ITEM QUANTITY
Smoke Detector with Cover
Sampling Tube (long)
Sampling Tube Filters
Test Magnet
Foam Gaskets
Screw, no. 6 Self Tapping
Tube End Plug (large)
Sampling Tube Support Bracket
Screw, 8-18
Screw,
Snap Bushing
Harness Assembly
Smoke detector bracket 50ZZ500420
Sampling tube bracket 50ZZ500421
Sampling tube bracket 50ZZ500431
(48/50Z030-050 with Power Exhaust)
3
/4-in. Pan Head
1
/4 AB-14 5/8-in.
Remove accessory pack-
1
1
2
1
2
2
1
1
2
2
1
1
1
1
1
48/50A Units —
The return air smoke detector is to be
installed in the predrilled holes located in the indoor section
above the auxiliary control box.
1. Open the hinged auxiliary control box access door and
secure.
2. Find the 2 plugs located in the partition above the control
box, remove and discard. See Fig. 2.
3. Remove cover from smoke detector. The screws will
remain captured in the cover.
4. Place foam gaskets over each sampling tube on smoke
detector. See Fig. 1.
5. Remove one knockout from top of smoke detector.
6. Insert stripped ends of wire harness through knockout and
wire to smoke detector as shown in Fig. 3. Use ground
screw in the smoke detector to secure a wire tie. Use wire
tie to provide strain relief for the wire harness.
7. Slide smoke detector into holes in partition. Do not secure
at this time.
PARTITION
SMOKE DETECTOR
MOUNTING PLUGS
Return Air Smoke Detector Installation
Prior to instal lation of this access ory, make sure all power
is disconnected to the unit and locked out. Failure to disconnect power supply prior to servicing may result in serious injury.
NOTE: For horizontal applications it is easiest to install the
smoke detector prior to making duct connections.
FOAM
GASKETS
SAMPLING TUBE
FILTERS
PLASTIC
SAMPLING TUBE
PLASTIC SAMPLING TUBE
SELF-TAPPING SCREW
PHOTO
DETECTOR BOARD
AUXILIARY
CONTROL PANEL
CONDUIT HOLES
PL13
DETECTOR
HOUSING
TERMINAL STRIP
POWER BOARD
COVER MOUNTING
SCREWS
DETECTOR COVER
Fig. 1 — Smoke Detector
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GROUND
SMOKE
DETECTOR
WIRE
HARNESS
SAMPLING
TUBE
SUPPORT
BRACKET
SAMPLING
TUBE
Fig. 4 — Smoke Detector Installed (48/50A020-060)
SCREW
SMOKE
DETECTOR
SAMPLING
TUBE
FILTERS
Fig. 3 — Smoke Detector Wiring Connections
8. Insert tube end plug into sampling tube and slide sampling tube into bottom hole of smoke detector.
9. Remove the unit side panel at the return end of the unit
(downshot units only). Save screws for use later.
10. Mount the sampling tube support bracket to the cross
member with two
1
/4 AB-14 5/8-in. screws as shown in
Fig. 4. Insert snap bushing into hole in bracket.
11. Slide sampling tube into bracket, making sure that the
sampling holes point in the opposite direction of the return air flow. Insert the sampling tube all the way into the
smoke detector.
12. Return to the auxiliary control box and secure sampling
tube to smoke detector with two no. 6 self-tapping
screws.
13. Attach smoke detector to partition using two, 8-18
pan head screws. See Fig. 4.
Do not overtighten the screws. Damage to smoke detector
may result.
14. Return to side panel and insert tube end plug into
sampling tube.
15. Replace the unit side panel.
16. Return to auxiliary control box section and insert sampling tube filters into both sampling tube holders. (See
Fig. 1.)
17. Connect harness PL13 as shown in Fig. 3.
18. Restore power to the unit.
19. Configure ComfortLink™ controller as specified in
Controls and Troubleshooting Guide.
20. Perform Standby , Alarm, and Sensitivity Tests on page 6.
At a minimum, the Magnet test should be performed t o
verify smoke detector wiring.
WIRE HARNESS
PL13
3
/4-in.
21. Replace smoke detector cover.
22. Check for alarms. Correct any problems.
23. Close and secure auxiliary control box door.
48/50Z Units —
The return air smoke detector is to be
installed on the upright in the power exhaust section. See
Fig. 5-10.
NOTE: For size 075-105 units with return fan option, the
smoke detector should be installed in the return duct. Do not
use the bracket provided in this accessory kit.
1. Open the power exhaust section doors/panels on both
sides of the unit to gain access.
2. Find plug 13 in the power exhaust section.
3. Remove cover from smoke detector. The screws will remain captured in the cover.
4. Place foam gaskets over each sampling tube on smoke
detector. See Fig. 1.
5. Remove one knockout from top of smoke detector.
6. Insert stripped ends of wire harness through knockout and
wire to smoke detector as shown in Fig. 3. Use ground
screw in the smoke detector to secure a wire tie. Use wire
tie to provide strain relief for the wire harness.
7. Mount the smoke detector bracket 50ZZ500420 on the
upright.
See Fig. 5 for size 030-050 units without economizer.
See Fig. 6 for size 030-050 units with economizer only
option.
See Fig. 7 for size 030-050 units with economizer and
power exhaust option.
See Fig. 8 for size 055-105 units without economizer.
See Fig. 9 for size 055-105 units with economizer only
option.
See Fig. 10 for size 055-105 units with economizer and
power exhaust option.
8. Slide smoke detector into holes in bracket. Do not secure
at this time.
9. Insert tube end plug into sampling tube and slide
sampling tube into bottom hole of smoke detector.
10. Mount the sampling tube bracket to the bottom of the
power exhaust section using two
1
/4 AB-14-5/8-in. screws.
For size 030-050 units with power exhaust, use bracket
50ZZ500431 as shown on Fig. 7. For all other units
use bracket 50ZZ500421, as shown on Fig. 5 and 6 for
size 030-050 units, Fig. 8-10 for size 055-105 units.
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SAMPLING
SAMPLING TUBE
BRACKET
SMOKE
DETECTOR
Fig. 10 — Smoke Detector for 48/50Z055-105
(Economizer with Power Exhaust)
Fig. 8 — Smoke Detector for 48/50Z055-105
(No Economizer or Power Exhaust)
Fig. 9 — Smoke Detector for 48/50Z055-105
(Economizer Only)
TUBE
BRACKET
SMOKE
DETECTOR
Fig. 5 — Smoke Detector for 48/50Z030-050
(No Economizer or Power Exhaust)
SAMPLING
TUBE
BRACKET
SMOKE
DETECTOR
Fig. 6 — Smoke Detector for 48/50Z030-050
(Economizer Only)
TUBE
SAMPLING
BRACKET
SAMPLING TUBE
BRACKET
SAMPLING TUBE
BRACKET
SMOKE
DETECTOR
Fig. 7 — Smoke Detector for 48/50Z030-050
(Economizer with Power Exhaust)
SMOKE
DETECTOR
SMOKE
DETECTOR
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11. Slide sampling tube into bracket, making sure the
sampling holes point in the opposite direction of the
return airflow. Insert the sampling tube all the way into
the smoke detector.
12. Secure sampling tube to smoke detector with two no. 6
self-tapping screws.
13. Attach smoke detector to the bracket using two 8-18
3
/4-in. pan head screws.
14. Insert the tube end plug into sampling tube.
15. Insert sampling tube filters into both sampling tube holders. See Fig. 1.
16. Connect harness PL13 as shown on Fig. 3.
17. Restore power to the unit.
18. Configure ComfortLink™ controller as specified in
Controls and Troubleshooting Guide.
19. Perform Standby, Alarm, and Sensitivity Tests. At a
minimum, the Magnet test should be performed to verify
smoke detector wiring.
20. Replace smoke detector cover.
21. Check for alarms. Correct any problems.
22. Close and secure all doors and panels.
Configuring the
configuration settings refer to the Control and Troubleshooting
Guide for 48/50A020-060 and 48/50Z030-105 units.
Comfort
Link Controller —
For
OPERATION
The smoke detector must be tested and maintained regularly following NFP A 72 requirements. The smoke detector
should be cleaned at least once a year. Damage to equipment may result.
The smoke detector accessories contain a photoelectric
detector approved for an extended air speed range of 100 to
4000 feet per minute (0.5 to 20.3 m/s) and an operational
temperature range of 32 to 131 F (0° to 55 C). Do not operate
the smoke detector outside of these ranges.
The smoke detector operates on 24 VAC, 120 VAC, or
240 VAC. The thermostat power terminals on the unit are used
to power the smoke detector. Alarm and supervisory relay contacts are available fo r co ntro l pa nel in ter fac e (ala r m init ia ti on) ,
HVAC control, and other auxiliary functions. Auxiliary relays
are also provided for fan shut down or signaling of up to 9
other detectors in the loop for multiple fan shut down. The
smoke detector is not designed for 2-wire applications.
The smoke detector can be reset by a momentary power
interruption, by the reset button on the front cover, by the
control panel, or by the remote reset accessory. The smoke
detector incorporates a cover tamper feature that provides
a trouble signal after 20 minutes if the cover is removed or
improperly installed. Proper installation of the cover removes
the trouble condition.
MAINTENANCE
Cleaning Procedure —
that the smoke detector system is undergoing maintenance, and
that the system will temporarily be out of service. Disable the
zone or system undergoing maintenance to prevent unwanted
alarms and possible dispatch of the fire department.
AIR FILTERS
1. Turn off power to the system.
Notify the proper authorities
2. Remove and inspect sampling tube filters.
3. If filters are heavily coated wi th dirt, replace them with
new filters. If they are not heavily coated, use a vacuum
cleaner or compressed air nozzle to remove dust, then
reinstall the filters.
PHOTO DETECTOR BOARD
1. Remove the screen by gently grasping on each side and
pulling straight off.
2. Lift the photo chamber in the same fashion. Vacuum the
screen and cover. Use clean, compressed air to loosen and
blow out any remaining debris.
3. Vacuum photo chamber, then use clean compressed air to
blow area clean.
4. Replace the chamber by pressing it onto th e base. Press
the screen into place. It should fit tightly on the chamber.
Filter Replacement —
affect smoke detector performance even when up to 90% of the
filter is clogged. Quarterly visual inspection usually suffices to
determine whether the filters should be replaced. Only a high
percentage of contamination affects performance. If further
testing is required, compare differential pressure readings with
and without the filters installed. If the difference exceeds 10%,
then replace the filters. The pressure differential should never
fall below 0.0015 in. wg.
The filters do not substantially
Board Replacement
SMOKE 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, ali gn the board mounting features,
holes, and the interconnect terminals. Push the board into
place.
4. Secure board with the two mounting screws.
POWER BOARD REPLACEMENT
1. Disconnect wiring from the terminal block.
2. Remove the two power board mounting screws.
3. Pull gently on the board to remove it.
4. To replace the board, ali gn the board mounting features,
holes, and the interconnect terminals. Push the board into
place.
5. Secure board with the two mounting screws.
6. Re-connect wiring to terminal block.
TROUBLESHOOTING
Test and maintain unit smoke detectors as recommended in
NFPA 72. Before conducting these tests, notify the proper
authorities that the smoke detection system will be temporarily
out of service. Disable the system under test to prevent unwanted
alarms.
Smoke Entry Tests
AIRFLOW TEST — The smoke detector is designed to
operate over an extended air speed range of 100 to 4000 fpm.
To verify sufficient sampling of unit air, turn on the unit
indoor fan using the Service Test function (see Controls and
Troubleshooting Guide for details on Service Test) and use a
manometer to measure the differential pressure between the
two sampling tubes.
The differential pressure should measure at least 0.0015 in. wg
and no more than 1.2 in. wg. Because most commercially available manometers cannot accurately measure very low pressure
differentials, applications with less than 500 fpm of unit air speed
may require the use of a current-sensing pressure transmitter or
the use of aerosol smoke (see Smoke Response Test on page 6).
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1
SMOKE RESPONSE TEST — Drill a
/4-in. hole 3 ft
upstream from the unit smoke detector. Use the Service Test
function (see Controls and Troubleshooting Guide for details
on Service Test) to turn on the unit indoor fan. Measure the air
velocity with an anemometer. Air speed must be at least
100 fpm. If the air speed is greater than 500 fpm, use a conventional manometer to measure differential pressure betw een t he
sampling tubes.
Spray aerosol smoke into the unit through the
1
/4-in. hole for
5 seconds. Wait two minutes for the unit smoke detector to
alarm. If the unit smoke detect or alarms, then air is flowing
through the detector. Remove the unit smoke detector cover
and blow out the residual aerosol smoke from the chamber and
reset the unit smoke detector. Use duct tape to seal the aerosol
smoke entry hole.
To determine if smoke is capable of entering the sensing
chamber, visually identify any obstructions. Plug the exhaust
and inlet tube holes to prevent unit air from carrying smoke
away from the detector head, then blow smoke directly at the
head to cause an alarm.
Remove the plugs after this test, or the smoke detector will
not function properly and damage may result.
Standby, Alarm and Sensitivity Tests —
The cover
of the smoke detector must be removed to perform these tests.
STANDBY AND TROUBLE TEST
Standby — Look for presence of flashing green LED.
The LED should flash approximately every
10 seconds.
Trouble — If the detector LED does not flash, then the detec-
tor lacks power, the detector board is missing
(replace), the cover has been missing or not
secured properly for more than 20 minutes (secure
cover properly), or the unit is defective (return for
repair).
Test — The trouble condition can be caused intentionally
to verify correct operation of the system. Remove
the detector board to cause an alarm.
Cover
T amper — If the cover is removed or not properly secured for
a period longer than 20 minutes, a trouble signal is
generated to indicate the cover is missing.
ALARM TEST
Magnet Test
1. Place the painted surface of the magnet onto the TEST
locator on the bottom of the housing.
2. The red alarm LED on the detector should switch on.
Verify system control panel alarm status and control
panel execution of all intended auxiliary functions
(i.e., fan shutdown, damper control, etc.).
3. The detector must be reset by the front cover reset button.
SENSITIVITY TEST — After verification of alarm capability ,
use a field-supplied voltmeter to check detector sensitivity. The
housing cover m ust be removed to perform this test. If readings
indicate that the detector head is ou tside of the acceptable range
that is printed on the label of the detector, the detector chamber
requires cleaning.
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Copyright 2003 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 1
Ta b 1 a 1 b
PC 111 Catalog No. 534-80157 Printed in U.S.A. Form 48/50A-5SI Pg 8 9-03 Replaces: New
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