Carrier VVT 33ZCVVTZC-01 Installation, Start-up And Configuration Instructions

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Carrier VVT 33ZCVVTZC-01 Installation, Start-up And Configuration Instructions Manual pdf 21 page image

21Indoor Air Quality Sensor Wiring — To wire the sensorsafter they are mounted in the conditioned air space and returnair duct, see Fig. 26 and the instructions shipped with the sen-sors. For each sensor, use two 2-conductor 18 AWG twisted-pair cables (unshielded) to connect the separate isolated 24 vacpower source to the sensor and to connect the sensor to the con-trol board terminals. To connect the sensor to the control board,identify the positive (+) PIN-8 and ground (GND) PIN-7 termi-nals on the sensor and connect the positive terminal to terminalRH/IAQ and connect the ground terminal to terminal GND.HUMIDITY SENSOR (WALL-MOUNTED) INSTALLA-TION — The accessory space humidity sensor is installed onan interior wall to measure the relative humidity of the air with-in the occupied space. See Fig. 27.The use of a standard 2 x 4-in. electrical box to accommo-date the wiring is recommended for installation. The sensor canbe mounted directly on the wall, if acceptable by local codes.If the sensor is installed directly on a wall surface, install thehumidity sensor using 2 screws and 2 hollow wall anchors(field-supplied); do not overtighten screws. See Fig. 15.The sensor must be mounted vertically on the wall. TheCarrier logo should be oriented correctly when the sensor isproperly mounted.DO NOT mount the sensor in drafty areas such as near heat-ing or air-conditioning ducts, open windows, fans, or over heatsources such as baseboard heaters, radiators, or wall-mountedlight dimmers. Sensors mounted in those areas will produce in-accurate readings.Avoid corner locations. Allow at least 4 ft between the sen-sor and any corner. Airflow near corners tends to be reduced,resulting in erratic sensor readings.Sensor should be vertically mounted approximately 5 ft upfrom the floor, beside the space temperature sensor.For distances up to 500 feet, use a 3-conductor, 18 or 20AWG cable. A communication cable can be used, although theshield is not required. The shield must be removed from thesensor end of the cable if this cable is used. See Fig. 28 forwiring details.The power for the sensor is provided by the control board.The board provides 24 vdc for the sensor. No additional powersource is required.To wire the sensor, perform the following:1. At the sensor, remove 4-in. of jacket from the cable. Strip1/4-in. of insulation from each conductor. Route the cablethrough the wire clearance opening in the center of thesensor. See Fig. 28.2. Connect the RED wire to the sensor screw terminalmarked (+).3. Install one lead from the resistor (supplied with the sen-sor) and the WHITE wire, into the sensor screw terminalmarked (–). After tightening the screw terminal, test theconnection by pulling gently on the resistor lead.4. Connect the remaining lead from the resistor to theBLACK wire and secure using a closed end type crimpconnector or wire nut.5. Using electrical tape, insulate any exposed resistor lead toprevent shorting.6. At the control box, remove the jacket from the cable androute the RED conductor over to the left side of the con-trol board. Route the remaining conductors to the rightside of the control board.7. Strip 1/4-in. of insulation from each conductor and equipeach with a 1/4-in. female quick connect terminal.8. Connect the RED wire to terminal +24v on the controlboard.9. Connect the BLACK wire to terminal GND on the con-trol board.10. Connect the WHITE/CLEAR wire to terminal RH/IAQon the control board.11. Connect shield to ground (if shielded wire is used).Remote Occupancy Contact — The remote occu-pancy input (J4 pin 1) has the capability to be connected to anormally open or normally closed occupancy dry contact. Wirethe dry contact as show in Fig. 29 between J4 Pin 1 and24 VAC J1 Pin 1. The 24 vac necessary to supply the VVT®zone controller remote occupancy contact input is suppliedusing the zone controller.Connect the Outputs — Wire the zone controller’soutputs (fan, staged heat, valves) as shown in the applicablewiring diagrams in Fig. 5-13.Do NOT clean or touch the sensing element with chemicalsolvents; they can permanently damage the sensor.3.25(8.3)5.625(14.3)1.125(2.9)0.25(0.8)5(12.7)NOTE: Dimensions are in inches. Dimensions in ( ) are in millimeters.Fig. 24 — Indoor Air Quality (CO 2) Sensor(33ZCSENCO2)Fig. 25 — Ventilation Rated Based onCO 2 Set Point