Carrier AQUAFORCE 30XA080-500 Installation Instructions Manual

Also see for AQUAFORCE 30XA080: Installation instructions Controls, start-up, operation, service and troubleshooting instructions Product data Controls, start-up, operation, service and troubleshooting instructions

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Carrier AQUAFORCE 30XA080-500 Installation Instructions Manual Manual pdf 62 page image

62Step 5 — Make Electrical ConnectionsPOWER SUPPLY — The electrical characteristics of theavailable power supply must agree with the unit nameplaterating. Supply voltage must be within the limits shown. SeeTables 5-11 for electrical and configuration data.FIELD POWER CONNECTIONS (See Fig. 37) — All powerwiring must comply with applicable local and national codes.Install field-supplied, branch circuit fused disconnect(s) of atype that can be locked off or open. Disconnect(s) must be locat-ed within sight and readily accessible from the unit in compli-ance with NEC Article 440-14 (U.S.A.). See Tables 5-11 forunit electrical data.Maximum wire size that the unit terminal block or non-fused disconnect will accept is 500 kcmil.POWER WIRING — All power wiring must comply with ap-plicable local and national codes. Install field-supplied branchcircuit fused disconnect per NEC of a type that can be lockedOFF or OPEN. Disconnect must be within sight and readily ac-cessible from the unit in compliance with NEC Article 440-14.In the power box, 7/8 in. holes are provided for power entry.The holes will need to bee enlarged to accept the appropriateconduit. NEC also requires all conduits from a conditionedspace to the power box(es) be sealed to prevent airflow andmoisture into the control box.The 30XA units require 1 or 2 power supplies, dependingon the unit and circuit voltage. See Tables 5-8 for chiller elec-trical data. Cooler and pump heaters, if factory-installed, arewired in the control circuit. Heaters on chillers with the option-al control transformer will be capable of operation only whenthe main power supply to the chiller is on. On chillers with sep-arate control power, the heaters are capable of operation when-ever the control power is supplied.FIELD CONTROL POWER CONNECTIONS (SeeFig. 37) — All units require 115-1-60 control circuit power,unless the control transformer option is installed.Terminals TB5-1 and TB5-2 are provided for field installa-tion of a chilled water (fluid) pump interlock (CWPI). Thechilled water (fluid) flow sensor (CWFS) is factory installed.These devices are to be installed in series. Contacts must berated for dry-circuit applications capable of handling a 24-vacat 50 mA load.An accessory remote on-off switch can be wired into TB5-9and TB5-10. Contacts must be rated for dry-circuit applicationscapable of handling a 24-vac at 50 mA load.Terminals 11 and 13 of TB5 are for control of the chilledwater pump 1 (PMP1) starter. Terminals 13 and 15 of TB5 arefor control of the chilled water pump 2 (PMP2) starter.CARRIER COMFORT NETWORK® COMMUNICATIONBUS WIRING (See Fig. 38) — The communication bus wiringis a shielded, 3-conductor cable with drain wire and is fieldsupplied and installed in the field.The system elements are connected to the communicationbus in a daisy chain arrangement. The positive pin of eachsystem element communication connector must be wired to thepositive pins of the system elements on either side of it. This isalso required for the negative and signal ground pins ofeach system element. Wiring connections for CCN (CarrierComfort Network) should be made at TB (terminal block) 3.Consult the CCN Contractor’s Manual for further information.See Fig. 38.NOTE: Conductors and drain wire must be 20 AWG(American Wire Gage) minimum stranded, tinned copper.Individual conductors must be insulated with PVC, PVC/nylon, vinyl, Teflon, or polyethylene. An aluminum/polyester100% foil shield and an outer jacket of PVC, PVC/nylon,chrome vinyl, or Teflon with a minimum operating tempera-ture range of –4 F (–20 C) to 140 F (60 C) is required. SeeTable 12 for a list of manufacturers that produce CCN buswiring that meet these requirements.It is important when connecting to a CCN communicationbus that a color coding scheme be used for the entire networkto simplify the installation. It is recommended that red be usedfor the signal positive, black for the signal negative, and whitefor the signal ground. Use a similar scheme for cables contain-ing different colored wires. At each system element, the shieldsof its communication bus cables must be tied together. If thecommunication bus is entirely within one building, the result-ing continuous shield must be connected to a ground at onepoint only. If the communication bus cable exits from onebuilding and enters another, the shields must be connected togrounds at the lightning suppressor in each building where thecable 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. Substitute appropri-ate colors for different colored cables.3. Connect the red wire to (+) terminal on TB3 of the plug,the white wire to COM terminal, and the black wire to the(–) terminal.WARNINGElectrical shock can cause personal injury and death. Shutoff all power to this equipment during installation. Theremay be more than one disconnect switch. Tag all discon-nect locations to alert others not to restore power until workis completed.IMPORTANT: The 30XA units have a factory-installedoption available for a non-fused disconnect for unit powersupply. If the unit is equipped with this option, all fieldpower wiring should be made to the non-fused disconnectsince no terminal blocks are supplied.CAUTIONDo not use interlocks or other safety device contactsconnected between TB5-9 and TB5-10 as remote on-off.Connection of safeties or other interlocks between these2 terminals will result in an electrical bypass if theENABLE-OFF-REMOTE contact switch is in theENABLE position. If remote on-off unit control isrequired, a field-supplied relay must be installed in the unitcontrol box and wired as shown in Fig. 37. Failure to wirethe remote on-off as recommended may result in tubefreeze damage.