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Фрагмент инструкции
Remove the two detector board mounting screws. 2. Pull gently on the board to remove it. 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 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. 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 48/50HG 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- sourcing pressure transmitter or the use of aerosol smoke (see Smoke Response Test below). 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 48/50HG 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 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. 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. 7 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 detector lacks power (check TB4), 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 TESTS 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 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. Copyright 2002 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. 1144 PC 111 Catalog No. 534-80096 Printed in U.S.A. Form 48/50HG-19SI Pg 8 2-02 Replaces: 48/50HG-17SI Book Tab 1a1b6a6b ...
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