Carrier 33ZCFANTRM Installation, Start-up And Service Instructions Manual

Also see for 33ZCFANTRM: Mounting instructions

Carrier 33ZCFANTRM Installation, Start-up And Service Instructions Manual Manual pdf 23 page image

23PRIMARY 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 CCN/Linkage compatible air source. The part num-ber is 33ZCSENPAT. See Fig. 15.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. 16.SUPPLY AIR TEMPERATURE (SAT) SENSOR INSTAL-LATION — On terminals with heat, the SAT sensor is re-quired. The SAT must be installed in the duct downstreamfrom the air terminal. The SAT sensor is also sometimes calleda duct temperature (DT) sensor. The part number is33ZCSENSAT.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. 17 for the sensor location in this application.If the unit has an octopus connected directly at the dis-charge, install the sensor in the octopus. If the unit has an elec-tric heater, the two foot minimum distance between the sensorand the heater must be maintained. See Fig. 17 for the sensorlocation in this application.Do not run sensor or relay wires in the same conduit or race-way with Class 1 AC or DC service wiring. Do not abrade, cut,or nick 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 SAT sensor tothe zone controller:1. Locate the opening in the control box. Pass the sensorprobe through the hole.2. Drill or punch a 1/4-in. hole in the duct downstream ofthe unit, at a location that conforms to the require-ments shown in Fig. 17.3. Use two field-supplied, self-drilling screws to securethe sensor probe to the duct. Use field-supplied bush-ings as spacers when installing the sensor probe in aduct 6 in. or less in diameter.Perform the following steps if state or local code requiresthe use of conduit, or if your installation requires a cable lengthof more than 8 ft:1. Remove the center knockout from a field-supplied 4 x2-in. junction box and secure the junction box to theduct at the location selected for the sensor probe.2. Drill a 1/2-in. hole in the duct through the opening inthe junction box.3. Connect a 1/2-in. nominal field-supplied conduitbetween the zone controller enclosure and the junctionbox.4. Pass the sensor probe wires through the conduit andinsert the probe in the duct. Use field-supplied bush-ings as spacers when installing the sensor probe in aduct 6 in. or less in diameter.5. Secure the probe to the duct with two field-suppliedself-drilling screws.6. If you are extending cable length beyond 8 ft, use ple-num rated, 20 AWG, twisted pair wire.7. Connect the sensor leads to the zone controller’s wir-ing harness terminal board at the terminals labeledSAT and GND.8. Neatly bundle and secure excess wire.INDOOR AIR QUALITY SENSOR INSTALLATION —The indoor air quality (IAQ) sensor accessory monitors carbondioxide levels. This information is used to modify the positionof the outdoor air dampers to admit more outdoor air asrequired to provide the desired ventilation rate. Two types ofsensors are supplied. The wall sensor can be used to monitorthe conditioned air space; the duct sensor monitors the returnair duct. Both wall and duct sensors use infrared technology tomeasure the levels of CO2 present in the air. The wall sensor isavailable with or without an LCD readout to display the CO2level in ppm. See Fig. 18.The sensor part number is 33ZCSENCO2. To mount thesensor, refer to the installation instructions shipped with the ac-cessory kit.Disconnect electrical power before wiring the zone control-ler. Electrical shock, personal injury, or damage to the zonecontroller can result.Fig. 15 — Primary Air Temperature Sensor(Part Number 33ZCSENPAT)Fig. 16 — Primary Air Temperature SensorInstallation (Unit Discharge Location)→800