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)

/4-in. Pan Head

/4 AB-14 5/8-in.

Remove accessory pack-

1 1 2 1 2 2 1 1 2 2 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

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

/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

/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.

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

/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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