Carrier WeatherMaster 50HC14 Installation Instructions Manual

Also see for WeatherMaster 50HC14: Service and maintenance instructions Service and maintenance instructions Installation instructions

Contents

49CONFIGURE THE UNIT FOR THERMOSTAT MODEConnect to the CCN bus using a CCN service tool andnavigate to PremierLink Configuration screen for OperatingMode. Default setting is Sensor Mode (value 1). Change thevalue to 0 to reconfigure the controller for Thermostat Mode.When the PremierLink controller is configured for Ther-mostat Mode, these functions are not available: Fire Shut-down (FSD), Remote Occupied (RMTOCC), CompressorSafety (CMPSAFE), Supply Fan Status (SFS), and FilterPressure Switch (FILTER).Economizer ControlsINDOOR AIR QUALITY (CO 2 ) SENSORThe indoor air quality sensor accessory monitors spacecarbon dioxide (CO 2) levels. This information is used tomonitor IAQ levels. Several types of sensors are available,for wall mounting in the space or in return duct, with andwithout LCD display, and in combination with space tem-perature sensors. Sensors use infrared technology to measurethe levels of CO2 present in the space air.The CO 2 sensors are all factory set for a range of 0 to 2000ppm and a linear mA output of 4 to 20. Refer to the instruc-tions supplied with the CO 2 sensor for electrical requirementsand terminal locations. See Fig. 68 for typical CO 2 sensorwiring schematic.To accurately monitor the quality of the air in the condi-tioned air space, locate the sensor near a return-air grille (ifpresent) so it senses the concentration of CO 2 leaving thespace. The sensor should be mounted in a location to avoiddirect breath contact.Do not mount the IAQ sensor in drafty areas such as nearsupply ducts, open windows, fans, or over heat sources. Al-low at least 3 ft (0.9 m) between the sensor and any corner.Avoid mounting the sensor where it is influenced by the sup-ply air; the sensor gives inaccurate readings if the supply airis blown directly onto the sensor or if the supply air does nothave a chance to mix with the room air before it is drawn intothe return airstream.Fig. 68 — Indoor/Outdoor Air Quality (CO 2) Sensor(33ZCSENCO2) — Typical Wiring DiagramWiring the Indoor Air Quality SensorFor each sensor, use two 2-conductor 18 AWG (AmericanWire Gage) twisted-pair cables (unshielded) to connect theseparate isolated 24 vac power source to the sensor and toconnect the sensor to the control board terminals.To connect the sensor to the control, identify the positive(4 to 20 mA) and ground (SIG COM) terminals on the sensor.See Fig. 68. Connect the 4-20 mA terminal to terminal TB3-9and connect the SIG COM terminal to terminal TB3-11. SeeFig. 69.Fig. 69 — Indoor CO 2 Sensor (33ZCSENCO2)ConnectionsRefer to PremierLink Controller Installation, Start-up, andConfiguration Instructions, for detailed configuration infor-mation.OUTDOOR AIR QUALITY SENSOR (P/N 33ZCSENCO2PLUS WEATHERPROOF ENCLOSURE)The outdoor air CO 2 sensor is designed to monitor carbondioxide (CO 2) levels in the outside ventilation air and inter-face with the ventilation damper in an HVAC system. TheOAQ sensor is packaged with an outdoor cover. See Fig. 70.The outdoor air CO2 sensor must be located in the economiz-er outside air hood.Fig. 70 — Outdoor Air Quality Sensor CoverWiring the Outdoor Air CO2 SensorA dedicated power supply is required for this sensor. Atwo-wire cable is required to wire the dedicated power supplyfor the sensor. The two wires should be connected to the pow-er supply and terminals 1 and 2.To connect the sensor to the control, identify the positive (4to 20 mA) and ground (SIG COM) terminals on the OAQ sen-sor. See Fig. 68. Connect the 4 to 20 mA terminal to the TB3-13 terminal of the 50HC**14. Connect the SIG COM terminalto the TB3-11 terminal of the 50HC**14. See Fig. 71.Fig. 71 — Outdoor CO 2 Sensor Connections8 7 6 5 4 3 2 12 1H G 24 VACOR24 VDCNC ALARMRELAYCONTACTSCOMNO }0-10VDCSIG COM4-20mA++-+ -J3 J4SEN J5-5J5-3COM911TB3TB3IAQ SensorPL24 VACCOVER REMOVED SIDE VIEWSEN J5-2J5-3COM1311TB3TB3OAQ SensorPL24 VAC