Carrier 50TCQA Installation Instructions Manual

Also see for 48TC*D: Service and maintenance instructions Installation instructions

Contents

33Table 9 – LEDsThe LEDs on the RTU--MP show the status of certain functionsIf this LED is on... Status is...Power The RTU MP has powerRx The RTU MP is receiving data from the network segmentTx The RTU MP is transmitting data over the network segmentDO# The digital output is activeThe Run and Error LEDs indicate control module and network statusIf Run LED shows... And Error LED shows... Status is...2 flashes per second Off Normal2 flashes per second 2 flashes,alternating with Run LED Five minute auto---restart delay after system error2 flashes per second 3 flashes,then off Control module has just been formatted2 flashes per second 4 flashes,then pauseTwo or more devices on this network have thesame ARC156 network address2 flashes per second On Exec halted after frequent system errors orcontrol programs halted5 flashes per second On Exec start---up aborted, Boot is running5 flashes per second Off Firmware transfer in progress, Boot is running7 flashes per second 7 flashes per second, alternating withRun LED Ten second recovery period after brownout14 flashes per second 14 flashes per second,alternating with Run LED BrownoutOn OnFailure. Try the following solutions:S Turn the RTU---MP off, then on.S Format the RTU---MP.S Download memory to the RTU---MP.S Replace the RTU---MP.NOTE: Refer to Form 48--50H--T--2T for completeconfiguration of RTU--MP, operating sequences andtroubleshooting information. Refer to RTU--MP 3rd PartyIntegration Guide for details on configuration andtroubleshooting of connected networks. Have a copy ofthese manuals available at unit start--up.SMOKE DETECTORSSmoke detectors are available as factory--installed optionson 50TCQ models. Smoke detectors may be specified forSupply Air only or for Return Air without or witheconomizer or in combination of Supply Air and ReturnAir. Return Air smoke detectors are arranged for verticalreturn configurations only. All components necessary foroperation are factory--provided and mounted. The unit isfactory--configured for immediate smoke detectorshutdown operation; additional wiring or modifications tounit terminal board may be necessary to complete the unitand smoke detector configuration to meet projectrequirements.Units equipped with factory--optional Return Air smokedetectors require a relocation of the sensor module at unitinstallation. See “Completing Installation of Return AirSmoke Sensor:” on page 35 for details.SystemThe smoke detector system consists of a four--wirecontroller and one or two sensors. Its primary function isto shut down the rooftop unit in order to prevent smokefrom circulating throughout the building. It is not to beused as a life saving device.ControllerThe controller (see Fig. 58) includes a controller housing,a printed circuit board, and a clear plastic cover. Thecontroller can be connected to one or two compatible ductsmoke sensors. The clear plastic cover is secured to thehousing with a single captive screw for easy access to thewiring terminals. The controller has three LEDs (forPower, Trouble and Alarm) and a manual test/reset button(on the cover face).SensorThe sensor (see Fig. 59) includes a plastic housing, aprinted circuit board, a clear plastic cover, a samplingtube inlet and an exhaust tube. The sampling tube (whenused) and exhaust tube are attached during installation.The sampling tube varies in length depending on the sizeof the rooftop unit. The clear plastic cover permits visualinspections without having to disassemble the sensor. Thecover attaches to the sensor housing using four captivescrews and forms an airtight chamber around the sensingelectronics. Each sensor includes a harness with an RJ4550TCQA