48/50A020-060
48/50Z030-105
Single-Package Rooftop Units
Accessory Return Smoke Detectors
Installation Instructions
Part No. CRSMKDET002C00
Follow all safety codes. Wear safety glasses and work
gloves. Use care when handling and installing the accessory.
CONTENTS
GENERAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Check Package Contents. . . . . . . . . . . . . . . . . . . . . . . . . 2
Return Air Smoke Detector Installation. . . . . . . . . . . 2
48/50A Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
48/50Z Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Configuring the ComfortLink™ Controller. . . . . . . . 5
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Cleaning Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Filter Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Board Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
The National Fire Protection Association has established
that DUCT DETECTORS MUST NOT BE USED AS A
SUBSTITUTE FOR OPEN AREA DETECTOR PRO-
TECTION 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 position and strongly
recommends that the user read NFPA Standards 90A, 72,
and 101. This smoke detector is listed per UL 268A.
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .5,6
Smoke Entry Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
• AIRFLOW TEST
• SMOKE RESPONSE TEST
Standby, Alarm and Sensitivity Tests. . . . . . . . . . . . . 6
• STANDBY AND TROUBLE TEST
• ALARM TEST
• SENSITIVITY TEST
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.
GENERAL
An HVAC (heating, ventilation and air-conditioning) sys-
tem 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 initiat-
ed 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.
This device will not sense smoke unless the ventilation sys-
tem 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 electrical and
environmental specifications listed in this manual. Failure
to comply with these requirements may prevent the detec-
tor from activating when smoke is present in the air duct.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical compo-
nents. 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 per-
sonnel. 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.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111 Catalog No. 534-80157 Printed in U.S.A. Form 48/50A-5SI Pg 1 9-03 Replaces: New
Book 1
1
Tab 1a 1b
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GROUND
SCREW
SMOKE
DETECTOR
SMOKE
WIRE
DETECTOR
HARNESS
SAMPLING
TUBE
SUPPORT
BRACKET
SAMPLING
TUBE
SAMPLING
TUBE
FILTERS
Fig. 4 — Smoke Detector Installed (48/50A020-060)
21. Replace smoke detector cover.
WIRE HARNESS
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.
PL13
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.
Fig. 3 — Smoke Detector Wiring Connections
1. Open the power exhaust section doors/panels on both
sides of the unit to gain access.
8. Insert tube end plug into sampling tube and slide sam-
pling tube into bottom hole of smoke detector.
2. Find plug 13 in the power exhaust section.
3. Remove cover from smoke detector. The screws will re-
main captured in the cover.
4. Place foam gaskets over each sampling tube on smoke
detector. See Fig. 1.
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
1
5
member with two /4 AB-14 /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 re-
turn 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.
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.
13. Attach smoke detector to partition using two, 8-18 3/4-in.
pan head screws. See Fig. 4.
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.
Do not overtighten the screws. Damage to smoke detector
may result.
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.
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 sam-
pling 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.
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.
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 to
verify smoke detector wiring.
3
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SAMPLING
TUBE
BRACKET
SAMPLING TUBE
BRACKET
SMOKE
DETECTOR
SMOKE
DETECTOR
Fig. 5 — Smoke Detector for 48/50Z030-050
(No Economizer or Power Exhaust)
Fig. 8 — Smoke Detector for 48/50Z055-105
(No Economizer or Power Exhaust)
SAMPLING
TUBE
BRACKET
SAMPLING TUBE
BRACKET
SMOKE
DETECTOR
SMOKE
DETECTOR
Fig. 6 — Smoke Detector for 48/50Z030-050
(Economizer Only)
Fig. 9 — Smoke Detector for 48/50Z055-105
(Economizer Only)
TUBE
SAMPLING
BRACKET
SAMPLING TUBE
BRACKET
SMOKE
DETECTOR
SMOKE
DETECTOR
Fig. 10 — Smoke Detector for 48/50Z055-105
(Economizer with Power Exhaust)
Fig. 7 — Smoke Detector for 48/50Z030-050
(Economizer with Power Exhaust)
4
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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.
2. Remove and inspect sampling tube filters.
3. If filters are heavily coated with 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.
15. Insert sampling tube filters into both sampling tube hold-
ers. See Fig. 1.
16. Connect harness PL13 as shown on Fig. 3.
17. Restore power to the unit.
3. Vacuum photo chamber, then use clean compressed air to
blow area clean.
4. Replace the chamber by pressing it onto the base. Press
the screen into place. It should fit tightly on the chamber.
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.
Filter Replacement — The filters do not substantially
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.
Configuring the ComfortLink Controller — For
configuration settings refer to the Control and Troubleshooting
Guide for 48/50A020-060 and 48/50Z030-105 units.
Board Replacement
SMOKE DETECTOR BOARD REPLACEMENT
1. Remove the two detector board mounting screws.
2. Pull gently on the board to remove it.
OPERATION
3. To replace the board, align 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
The smoke detector must be tested and maintained regu-
larly following NFPA 72 requirements. The smoke detector
should be cleaned at least once a year. Damage to equip-
ment may result.
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, align the board mounting features,
holes, and the interconnect terminals. Push the board into
place.
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 con-
tacts are available for control panel interface (alarm initiation),
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.
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 avail-
able 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).
MAINTENANCE
Cleaning Procedure — Notify the proper authorities
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.
5
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SMOKE RESPONSE TEST — Drill a 1/4-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 conven-
tional manometer to measure differential pressure between the
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 detector 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.
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
Tamper — 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.).
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.
3. The detector must be reset by the front cover reset button.
Remove the plugs after this test, or the smoke detector will
not function properly and damage may result.
SENSITIVITY TEST — After verification of alarm capability,
use a field-supplied voltmeter to check detector sensitivity. The
housing cover must be removed to perform this test. If readings
indicate that the detector head is outside of the acceptable range
that is printed on the label of the detector, the detector chamber
requires cleaning.
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.
6
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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.
PC 111 Catalog No. 534-80157 Printed in U.S.A. Form 48/50A-5SI Pg 8 9-03 Replaces: New
Book 1
1
Tab 1a 1b
Download from Www.Somanuals.com. All Manuals Search And Download.
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