Carrier 19XR Installation Instructions Manual

Also see for HERMETIC CENTRIFUGAL LIQUID CHILLERS 19XR: User manual Start-up and service instructions Installation instructions Product data Start-up, operation and maintenance instructions

Contents

48NOTES FOR FIG. 2719XR with Free-Standing Starter (Medium Voltage)I. GENERAL1.0 Starters shall be designed and manufactured in accordancewith Carrier Engineering Requirement Z-415.1.1 All field-supplied conductors, devices, and the fieldinstallation wiring, termination of conductors and devices,must be in compliance with all applicable codes and jobspecifications.1.2 The routing of field-installed conduit and conductors andthe location of field-installed devices must not interfere withequipment access or the reading, adjusting, or servicing ofany component.1.3 Equipment installation and all starting and control devices,must comply with details in equipment submittal drawingsand literature.1.4 Contacts and switches are shown in the position they wouldassume with the circuit de-energized and chiller shutdown.1.5 WARNING — Do not use aluminum conductors.1.6 Installer is responsible for any damage caused by improperwiring between starter and machine.1.7 All field-installed wiring is field-supplied.II. POWER WIRING TO STARTER2.0 Provide a means of disconnecting power to starter.2.1 Lug adapters may be required if installation conditions dic-tate that conductors be sized beyond the minimum ampac-ity required. Contact starter supplier for lug information.2.2 Compressor motor and controls must be grounded by usingequipment grounding lug provided inside starter enclosure.III. CONTROL WIRING3.0 Field supplied control conductors to be at least 18 AWG orlarger.3.1 Ice build start/terminate device contacts, remote start/stopdevice contacts, and spare safety device contacts (devicesnot supplied by Carrier), must have 24 VAC rating. MAXcurrent is 60 mA, nominal current is 10 mA. Switches withgold plated bifurcated contacts are recommended.3.2 Each integrated contact output can control loads (VA) forevaporator pump, condenser pump, tower fan low, tower fanhigh, and alarm annunciator devices rated 5 amps at 115VAC and up to 3 amps at 277 VAC.Do not use control transformers in the control center as thepower source for external or field-supplied contactor coils,actuator motors or any other loads.3.3 Do not route control wiring carrying 30 v or less within aconduit which has wires carrying 50 v or higher or alongside wires carrying 50 v or higher.3.4 Control wiring between starter and power panel must beseparate shielded cables with minimum rating 600 v, 80 C.Ground shield at starter.3.5 If optional circuit breaker is not supplied within the starterenclosure, it must be located within sight of machine with wir-ing routed to suit.3.6 When providing conductors for oil pump motor and oilheater power, refer to sizing data on label located on thechiller power panel, equipment submittal documentation, orequipment product data catalog.3.7 Spare 4-20 mA output signal is designed for controllers with anon-grounded 4-20 mA input signal and a maximum inputimpedance of 500 ohms.IV. POWER WIRING BETWEEN FREE-STANDING STARTERAND COMPRESSOR MOTOR4.0 Medium voltage (over 600 volts) compressor motors have (3)terminals. Motor terminal connections below 5 kV are 3/4-inthreaded and above 5 kV they are 9/16-in. threaded stud. Acompression lug with a single hole can be connected directlyto the stud or 3 adapters are supplied for connecting a NEMAlug for two 1/2-in. stud connections per phase. Use suitableconnectors and insulation for high voltage alternating currentcable terminations (these items are not supplied by Carrier).Compressor motor starter must have nameplate stamped asto conforming with Carrier Engineering requirement “Z-415.”4.1 Power conductor rating must meet minimum unit nameplatevoltage and compressor motor RLA. Refer to the labellocated on the side of the chiller control panel, equipmentsubmittal documentation, or equipment product data catalogfor conductor sizing data. (Conductor as defined below maybe a single lead or multiple smaller ampacity leads in paral-lel for the purpose of carrying the equivalent or higher cur-rent of a single larger lead.)When (3) conductors are used:Minimum ampacity per conductor = 1.25 x compressor RLA4.2 When more than one conduit is used to run conductorsfrom starter to compressor motor terminal box, an equalnumber of leads from each phase (conductor) must be ineach conduit to prevent excessive heating. (For example,conductors to motor terminals 1, 2, and 3 in one conduit,and those to 4, 5, and 6 in another.)4.4 Compressor motor power conductors may enter terminalbox through top, left side, or bottom left using holes cut bycontractor to suit conduit. Flexible conduit should be usedfor the last few feet to the terminal box for unit vibration iso-lation. Use of stress cones may require an oversize (spe-cial) motor terminal box (not supplied by Carrier).4.3 Compressor motor frame to be grounded in accordancewith the National Electrical Code (NFPA-70) and applicablecodes. Means for grounding compressor motor is a #4AWG to 500 MCM pressure connector, supplied andlocated in the lower left corner of the compressor motor ter-minal box.4.5 Do not allow motor terminals to support weight of wirecables. Use cable supports and strain reliefs as required.4.6 Use backup wrench when tightening lead connectors tomotor terminal studs. Torque to 30-35 ft-lb for the 9 / 16 in.stud and 35-40 ft-lb for the ¾ in. stud.CAUTIONTo prevent damage to machine, do NOT punch holes or drill intothe top surface of the starter enclosure for field wiring. Knock-outs are provided on the side of the starter enclosure for fieldwiring connections.CAUTIONControl wiring for Carrier to start pumps and tower fan motorsand establish flows must be provided to assure machine protec-tion. If primary pump, tower fan, and flow control is by othermeans, also provide parallel means for control by Carrier. Fail-ure to do so could result in machine freeze-up or overpressure.