Carrier WEATHERMAKER 48AJ Installation Instructions Manual

Also see for 48AJ: Installation, Start-Up and Service Instructions Operation and service guide Started guide Operating and service guide

Contents

31T58 Communicating Thermostat — Carrier also has a fullycommunicating thermostat which, if used, will be wired to theCCN communication connections on TB3 as described in theCarrier Comfort Network® Interface section below.Carrier Comfort Network Interface — The rooftop units canbe connected to the CCN system. The communication buswiring is supplied and installed in the field. Wiring consists ofshielded, 3-conductor cable with drain wire. The systemelements are connected to the communication bus in a daisychain arrangement. The positive pin of each system elementcommunication connector must be wired to the positive pins ofthe system element on either side of it, the negative pins must bewired to the negative pins, and the signal pins must be wired tosignal ground pins. Wiring connections for CCN should bemade at the TB3 terminal block using the screw terminals. TheTB3 board also contains an RJ14 CCN plug that can be used toconnect a field service computer or other CCN device tempo-rarily. There is also an RJ14 LEN (local equipment network)connection that is used to connect a Navigator™ device ordownload software.Conductors and drain wire must be 20 AWG minimumstranded, tinned copper. Individual conductors must be insulat-ed with PVC, PVC/nylon, vinyl, Teflon, or polyethylene. Analuminum/polyester 100% foil shield and an outer jacket ofPVC, PVC/nylon, chrome vinyl, or Teflon with a minimumoperating temperature range of –20 C to 60 C (–4 F to 140 F) isrequired. Table 9 lists cables that meet the requirements.Table 9 — CCN Connection Approved Shield CableTable 10 — Color Code RecommendationsIf a cable with a different color scheme is selected, a similarcolor code should be adopted for the entire network. At eachsystem element, the shields of the communication bus cablesmust be tied together. If the communication bus is entirelywithin one building, the resulting continuous shield must beconnected to a ground at one point only. If the communicationbus cable exits from one building and enters another, theshields must be connected to grounds at the lightning suppres-sor in each building where the cable enters or exits the building(one point per building only).To connect the unit to the network:1. Turn off power to the control box.2. Cut the CCN wire and strip the ends of the red (+), white(ground), and black (–) conductors. (If a different net-work color scheme is used, substitute appropriate colors.)3. Remove the 3-pin male plug from the base control boardin the main control box, and connect the wires as follows:a. Insert and secure the red (+) wire to terminal 1 ofthe 3-pin plug.b. Insert and secure the white (ground) wire to termi-nal 2 of the 3-pin plug.c. Insert and secure the black (–) wire to terminal 3 ofthe 3-pin plug.4. Insert the plug into the existing 3-pin mating connector onthe base module in the main control box.VAV Units with Heat — For variable air volume units thatwill use heat, the variable air volume terminals should beinterlocked with the unit at TB5 terminals 1 and 2.Demand Ventilation — The unit can be equipped with a CO2sensor for use in demand ventilation. This can be factorysupplied and will be mounted in the return duct. It can also befield supplied and mounted in the return duct or in the space.Connect the field-installed 4 to 20 mA sensor to TB5 terminal6 and 7. Do not remove the factory-installed 182-ohm resistor.If an outdoor air quality sensor is used then it should bewired to terminal 11 and 12 on TB6. This will require the useof the optional controls expansion module.Remote IAQ Override — If the control is being used with nonCarrier building management system it supports the use of theremote IAQ override switch. This should be connected toTB6 terminal 13 and 14. Use of this will require the optionalcontrols expansion module.Remote Economizer Position Control — The ComfortLink™controls will normally control the position of the economizer,but it can also support field control of the economizer positionthrough a 4 to 20 mA signal. If this is used it should be con-nected to TB5 terminal 6 and 7. If the signal is a 4 to 20 mAsignal then leave the 182-ohm resistor in place.Remote Economizer Enable — If the control is being usedwith other building management systems and the system willcontrol the enabling and disabling of the economizer free cool-ing, this switch input can be connected to TB6 terminals 1 and2. Note that the controls also support integrated economizerchangeover using outdoor dry bulb, differential dry bulb,outdoor enthalpy and differential enthalpy.Remote Occupancy Switch — For interface to other buildingmanagement systems the control also supports a switch inputfor remote occupancy signals. This wiring should be connectedto terminal TB6 terminal 1 and 3.Remote Economizer Minimum Position Control — If theComfortLink control is controlling the economizer, but a remoteminimum position is required, then an external 100K potentiom-eter can be connected to TB5 terminal 6 and 7. Remove thefactory-installed 182-ohm resistor.Smoke Sensor Interface — The ComfortLink control includesan optional factory-installed return air smoke detector. Remotealarm circuits can be wired to TB5 terminal 8 and 9.Fire Shutdown and Smoke Control — The control supportsinterface to fire and smoke control systems and allows for thefollowing system overrides from remote switch inputs.• Fire Shutdown — Connect to TB6 terminals 8 and 9.• Smoke Pressurization — Connect to TB6 terminal 12and 13. This requires the use of the optional controlsexpansion module.• Smoke Evacuation — Connect to TB6 terminal 12 and14. This requires the use of the optional controls expan-sion module.• Smoke Purge — Connect to TB6 terminal 12 and 15.This requires the use of the optional controls expansionmodule.Demand Limiting — The control can also be used with demandlimiting control from remote building management systems. If atwo stage system is going to be used with Redline Limitingwhere the machine is not allowed to increase load and Load Shedwhere the load is decreased to a configurable limit in capacitythen these can be connected to TB6 terminals 4 and 5 and 5 and6. This requires use of the controls expansion module.MANUFACTURER CABLE PART NO.Alpha 2413 or 5463American A22503Belden 8772Columbia 02525IMPORTANT: When connecting to CCN communi-cation bus to system elements, use color codingsystem for the entire network to simplify installationand checkout. See Table 10.SIGNAL TYPE CCN BUS CONDUCTORINSULATION COLORCCN PLUG PINNO.Positive (+) RED 1Ground WHITE 2Negative (–) BLACK 3