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 23 page image

23Modulating Baseboard Hydronic Heating — In-stall the water valve on the leaving water end of the baseboardheater. See Fig. 30. Observe the fluid flow direction whenmounting the valve. Be sure to properly heat sink the valve anddirect the flame away from the actuator and valve body whensweating the valve connections. Install the leaving water tem-perature sensor (33ZCSENCHG) on the hydronic heating coilas shown. The sensor accommodates nominal copper pipefrom 1/2 to 1-in. (OD sizes from 5/8 to 1.125 in.). It should besecured to the pipe with the clamp supplied. If piping is largerthan 1-in. nominal size, a field-supplied clamp must be used.Use fiberglass pipe insulation to insulate the sensor assembly.Refer to Fig. 7 and 11 to wire the modulating water valveand the sensor to the zone controller. Connect the leaving watertemperature sensor to the controller using the wiring connec-tions shown for the SAT sensor. (NOTE: The leaving watertemperature sensor replaces the SAT sensor in this application.)Use 18 or 20 AWG wire for all connections. The water valveactuator housing may be used as a junction box if the leavingwater temperature sensor cable is not long enough and thesensor cable must be extended to reach the controller.For modulating hydronic heating applications, the defaultconfiguration must be changed to properly control the valve.Refer to the service configuration table and set the HeatingLoop parameters as follows:Proportional Gain = 20.0Integral Gain = 0.5Derivative Gain = 0.0Start Value = 102.0Also, set the Ducted Heat decision to YES and set theMaximum Duct Temperature decision equal to the design(maximum) boiler water temperature minus 20 degrees, but notgreater than 200 F.Connect the Carrier Communicating Net-work Communication Bus — The zone controllersconnect to the bus in a daisy chain arrangement. The zonecontroller may be installed on a primary bus or on a secondarybus from the primary bus. Connecting to a secondary bus isrecommended.At 9,600 baud, the number of controllers is limited to128 zones maximum, with a limit of 8 systems (Linkage Coor-dinator configured for at least 2 zones). Bus length may notexceed 4000 ft, with no more than 60 devices on any 1000-ftsection. Optically isolated RS-485 repeaters are required every1000 ft.At 19,200 and 38,400 baud, the number of controllersis limited to 128 maximum, with no limit on the number ofLinkage Coordinators. Bus length may not exceed 1000 ft.On larger systems with more than 8 linkage coordinators,use bridges to split the system into sections. The first zone con-troller in a network connects directly to the bridge and theothers are wired sequentially in a daisy chain fashion. Refer toFig. 31 for an illustration of Communication Bus wiring.The Communication Bus also connects to the zone control-ler space temperature sensor. Refer to the Install the Sensorssection for sensor wiring instructions.COMMUNICATION BUS WIRE SPECIFICATIONS — TheCommunication Bus wiring is field-supplied and field-installed. It consists of shielded three-conductor cable withdrain (ground) wire. The cable selected must be identical to theCommunication Bus wire used for the entire network. SeeTable 2 for recommended cable.Table 2 — Recommended CablesNOTE: Conductors and drain wire must be at least 20 AWG(American Wire Gage), stranded, and tinned copper. Individual con-ductors must be insulated with PVC, PVC/nylon, vinyl, Teflon, orpolyethylene. An aluminum/polyester 100% foil shield and an outerjacket of PVC, PVC/nylon, chrome vinyl, or Teflon with a minimumoperating temperature range of –20 C to 60 C is required.CONNECTION TO THE COMMUNICATION BUS1. Strip the ends of the red, white, and black conductors ofthe communication bus cable.2. Connect one end of the communication bus cable to thebridge communication port labeled COMM2 (if connect-ing on a secondary bus).When connecting the communication bus cable, a colorcode system for the entire network is recommended tosimplify installation and checkout. See Table 3 for therecommended color code.3. Connect the other end of the communication bus cableto the terminal block labeled J2A in the zone controllerof the first air terminal. Following the color code inTable 3, connect the Red (+) wire to Terminal 1.Connect the White (ground) wire to Terminal 2.Connect the Black (–) wire to Terminal 3.4. Connect additional zone controllers in a daisy chain fash-ion, following the color coded wiring scheme in Table 3.Refer to Fig. 31.NOTE: The communication bus drain wires (shield) must betied together at each zone controller. If the communication busis entirely within one building, the resulting continuous shieldmust be connected to ground at only one single point. If thecommunication bus cable exits from one building and entersanother building, connect the shields to ground at a lightningsuppressor in each building where the cable enters or exits (onepoint only).Table 3 — Color Code RecommendationsMANUFACTURER CABLE PART NO.Alpha 2413 or 5463American A22503Belden 8772Columbia 02525SIGNAL TYPE COMMUNICATIONBUS WIRE COLORPLUG PINNUMBER+ Red 1Ground White 2– Black 3Fig. 27 — Wall Mounted Relative Humidity Sensor1104→