Carrier 50KC04-06 Service And Maintenance Instructions

21Fig. 27 — Return Air Sampling Tube LocationCompleting Installation of Return Air SmokeSensor1. Unscrew the two screws holding the Return Air Sensordetector plate. See Fig. 28. Save the screws.2. Remove the Return Air Sensor and its detector plate.3. Rotate the detector plate so the sensor is facing outwardsand the sampling tube connection is on the bottom. SeeFig. 29.4. Screw the sensor and detector plate into its operating posi-tion using screws from Step 1. Make sure the samplingtube connection is on the bottom and the exhaust tube ison the top. See Fig. 29.5. Connect the flexible tube on the sampling inlet to the sam-pling tube on the basepan.6. For units with an economizer, the sampling tube is inte-grated into the economizer housing but the connection ofthe flexible tubing to the sampling tube is the same.Fig. 28 — Return Air Detector Shipping PositionFig. 29 — Return Air Sensor Operating PositionFIOP Smoke Detector Wiring and ResponseALL UNITSFIOP smoke detector is configured to automatically shut downall unit operations when smoke condition is detected. SeeFig. 30, Smoke Detector Wiring.HIGHLIGHT AJMP 3 is factory-cut, transferring unit control to smoke detector.HIGHLIGHT BSmoke detector NC contact set will open on smoke alarm con-dition, de-energizing the ORN conductor.HIGHLIGHT C24-v power signal via ORN lead is removed at Smoke Detectorinput on CTB; all unit operations cease immediately.PREMIERLINK CONTROLUnit operating functions (fan, cooling and heating) are termi-nated as described above.HIGHLIGHT DOn smoke alarm condition, the smoke detector “NO Alarm”contact will close, supplying 24-v power to GRA conductor.HIGHLIGHT EWHT lead at Smoke Alarm input on CTB provides 24-v signalto FIOP DDC control.PREMIER-LINKThis signal is conveyed to PremierLink FIOP’s TB1 at terminalTB1-6 (BLU lead). This signal initiates the FSD sequence bythe PremierLink control. FSD status is reported to connectedCCN network.RTU-OPENThe 24-v signal is conveyed to RTU-Open’s J1-10 input termi-nal. This signal initiates the FSD sequence by the RTU-Opencontrol. FSD status is reported to connected BAS network.USING REMOTE LOGICSix conductors are provided for field use (see Highlight F inFig. 30) for additional annunciation functions.Additional Application Data — Refer to Factory-InstalledSmoke Detectors for Small and Medium Rooftop Units 2 to 25Tons for discussions on additional control features of thesesmoke detectors including multiple unit coordination. SeeFig. 30.RETURN AIRSAMPLING TUBEFlexibleExhaust TubesScrewsSample Tube