Carrier 48-50A020-060 User Manual
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
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
2
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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