Carrier Air Conditioner 48 50A020 060 User Manual

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  
 
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
 
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
 
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 ComfortLinkcontroller 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
 
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
 
 
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  
 

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