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

Also see for 3V VVT 33ZCVVTZC-01: Installation and start-up instructions

Carrier VVT 33ZCVVTZC-01 Installation, Start-up And Configuration Instructions Manual pdf 18 page image

18Table 1 — Thermistor Resistance vs Temperature Values for Space Temperature Sensor, Return-AirTemperature Sensor, and Supply-Air Temperature SensorPRIMARY AIR TEMPERATURE SENSOR INSTALLA-TION — A primary air temperature (PAT) sensor is used on azone controller which is functioning as a Linkage Coordinatorfor a non Carrier Network/Linkage compatible air source. Thepart number is 33ZCSENPAT. See Fig. 19.When used on a zone controller, try to select a zone control-ler which will allow installation of the PAT sensor in the maintrunk, as close to the air source as possible. See Fig. 20.DUCT TEMPERATURE SENSOR (33ZCSENDAT)INSTALLATION — The 33ZCSENDAT Duct Air Tempera-ture Sensor is required for cooling only applications on non-Carrier dampers. The sensor is used for supply air monitoring.The sensor has an operating range of –40 to 245 F (–40 to118 C) and includes a mounting grommet and 75-in. cable. Theduct temperature sensor must be installed in the supply air duct.See Fig. 21 for sensor details.The duct temperature sensor should be moved to a locationwhich will provide the best sensing of the supply-air tempera-ture during heating and cooling.For systems using a ducted supply, the duct temperaturesensor should be located in the supply duct downstream of thedischarge of the air source and before the bypass damper toallow good mixing of the supply airstream.The 33ZCSENDAT duct sensor is a small epoxy sensor thatis 11/4-in. long. A grommet is provided for filling the holearound the sensor cable after the sensor is located in the duct.See Fig. 22 for mounting location.Do not run sensor or relay wires in the same conduit or race-way with Class 1 AC service wiring. Do not abrade, cut, ornick the outer jacket of the cable. Do not pull or draw cablewith a force that may harm the physical or electrical properties.Avoid splices in any control wiring.Perform the following steps to connect the duct temperaturesensor to the bypass controller:1. Drill or punch a 1/4-in. hole in the supply duct. SeeFig. 22. Duct sensor can be installed to hang from top ofduct or from the sides. Sensor probe can touch side ofduct.2. Push sensor through hole in the supply duct. Snap thegrommet into the hole until it is secure. Pull on the leadsof the duct sensor until the sensor is snug against thegrommet.3. Connect the sensor leads to the bypass controller’s termi-nal board at the terminals labeled SAT and GND. SeeFig. 5-13 for wiring. If extending cable length beyond8 ft, use plenum rated, 20 AWG (American Wire Gage),twisted pair wire. Sensor wiring does not have polarity.Either lead can be wired to either terminal.4. Neatly bundle and secure excess wire.5. Using electrical tape, insulate any exposed lead to preventshorting.6. Connect shield to earth ground (if shielded wire is used).SUPPLY AIR TEMPERATURE (33ZCSENSAT) SENSORINSTALLATION — The 33ZCSENSAT supply air tempera-ture sensor is required for reheat applications or stand-aloneoperation. The sensor has an operating range of –40 to 245 F(–40 to 118 C) and includes a 6-in. stainless steel probe andcable. The sensor is factory-supplied but must be relocated forducted heat. The SAT must be installed in the duct downstreamfrom the air terminal. The SAT sensor is also sometimes calleda duct air temperature sensor. Part number 33ZCSENSAT maybe used in place of the factory-installed sensor.The SAT sensor probe is 6 inches in length. The tip of theprobe must not touch the inside of the duct. Use field-suppliedbushings as spacers when mounting the probe in a duct that is6 in. or less in diameter.If the unit is a cooling only unit, the SAT is not required.If the unit is equipped with electric reheat, ensure that thesensor is installed at least 2 ft downstream of the electric heater.See Fig. 23 for the sensor location in this application.If the unit has an octopus connected directly at thedischarge, install the sensor in the octopus. If the unit has anelectric heater, the two-foot minimum distance between thesensor and the heater must be maintained. See Fig. 23 for thesensor location in this application.TEMP(C) TEMP(F) RESISTANCE(Ohms)–40 –40 335,651–35 –31 242,195–30 –22 176,683–25 –13 130,243–20 –4 96,974–15 5 72,895–10 14 55,298–5 23 42,3150 32 32,6515 41 25,39510 50 19,90315 59 15,71420 68 12,49425 77 10,00030 86 8,05635 95 6,53040 104 5,32545 113 4,36750 122 3,60155 131 2,98560 140 2,48765 149 2,08270 158 1,752Disconnect electrical power before wiring the bypass con-troller. Electrical shock, personal injury, or damage to thefan coil controller can result.Disconnect electrical power before wiring the zone control-ler. Electrical shock, personal injury, or damage to the zonecontroller can result.