Carrier HERMETIC CENTRIFUGAL LIQUID CHILLERS 19XR Installation Instructions Manual

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

Contents

IMPORTANT: Wiring shown is typical and not intended to showdetail for a specific installation. Refer to certified field wiringdiagrams.NOTES:I. GENERAL1.0 Starters shall be designed and manufactured in accordance withCarrier Engineering Requirement Z-375.1.1 All field-supplied conductors, devices, field-installation wiring, and ter-mination of conductors and devices must be in compliance with all ap-plicable codes and job specifications.1.2 The routing of field-installed conduit and conductors and the locationof field-installed devices must not interfere with equipment access orthe reading, adjusting, or servicing of any component.1.3 Equipment, installation, and all starting and control devices must com-ply with details in equipment submittal drawings and literature.1.4 Contacts and switches are shown in the position they would assumewith the circuit deenergized and the chiller shut down.1.5 WARNING — Do not use aluminum conductors.1.6 Installer is responsible for any damage caused by improper wiring be-tween starter and machine.II. POWER WIRING TO STARTER2.0 Power conductor rating must meet minimum unit nameplate voltageand compressor motor RLA.When (3) conductors are used:Minimum ampacity per conductor = 1.25 x compressor RLAWhen (6) conductors are used:Minimum ampacity per conductor = 0.721 x compressor RLA2.1 Lug adapters may be required if installation conditions dictate that con-ductors be sized beyond the minimum ampacity required. Contact startersupplier for lug information.2.2 Compressor motor and controls must be grounded by using equip-ment grounding lugs provided inside starter enclosure.III. CONTROL WIRING3.0 Field supplied control conductors to be at least 18 AWG or larger.3.1 Chilled water and condenser water flow switch contacts, optional re-mote start device contacts, and optional spare safety device contactsmust have 24 vdc rating. Max current is 60 mA; nominal current is10 mA. Switches with gold plated bifurcated contacts arerecommended.3.2 Remove jumper wire between 12A and 12B before connecting auxil-iary safeties between these terminals.3.3 Pilot relays can control cooler and condenser pump and tower fan mo-tor contactor coil loads rated 10 amps at 115 vac up to 3 amps at600 vac. Control wiring required for Carrier to start pumps and towerfan motors must be provided to assure machine protection. If primary pumpand tower fan motor are controlled by other means, also provide a parallelmeans for control by Carrier. Do not use starter control transformer as thepower source for pilot relay loads.3.4 Do not route control wiring carrying 30 v or less within a conduit which haswires carrying 50 v or higher or alongside wires carrying 50 v or higher.3.5 Voltage selector switch in machine power panel is factory set for 115 vcontrol power source. When 230 v control power source is used, set switchto 230 v position.3.6 Control wiring cables between starter and power panel must be shieldedwith minimum rating of 600 v, 80 C. Ground shield at starter.3.7 If optional oil pump circuit breaker is not supplied within the starter enclo-sure as shown, it must be located within sight of the machine with wiringrouted to suit.IV. POWER WIRING BETWEEN STARTER AND COMPRESSOR MOTOR4.0 Low voltage (600 v or less) compressor motors have (6) 3⁄4 in. terminalstuds (lead connectors not supplied by Carrier). Either 3 or 6 leadsmust be run between compressor motor and starter, depending on typeof motor starter employed. If only 3 leads are required, jumper motorterminals as follows: 1 to 6, 2 to 4, 3 to 5. Center to center distancebetween terminals is 215⁄16 inches. Compressor motor starter must havenameplate stamped as conforming with Carrier requirement Z-375.4.1 When more than one conduit is used to run conductors from starter tocompressor motor terminal box, one conductor from each phase mustbe in each conduit to prevent excessive heating. (e.g., conductors tomotor terminals 1, 2 & 3 in one conduit, and those to 4, 5 & 6 inanother.)4.2 Compressor motor power connections can be made through top, toprear, or sides of compressor motor terminal box using holes cut by con-tractor to suit conduit. Flexible conduit should be used for the last fewfeet to the terminal box for unit vibration isolation. Use of stress conesor 12 conductors larger than 500 MCM may require an oversize (spe-cial) motor terminal box (not supplied by Carrier). Lead connectionsbetween 3-phase motors and their starters must not be insulated untilCarrier personnel have checked compressor and oil pump rotations.4.3 Compressor motor frame to be grounded in accordance with the Na-tional Electrical Code (NFPA-70) and applicable codes. Means for ground-ing compressor motor is a pressure connector for No. 4 to 500 MCMwire, supplied and located in the back lower left side corner of the com-pressor motor terminal box.4.4 Do not allow motor terminals to support weight of wire cables. Use cablesupports and strain reliefs as required.4.5 Use backup wrench when tightening lead connectors to motor terminalstuds. Torque to 45 lb-ft max.Fig. 28 — 19XR Typical Field Wiring with Optional Unit-Mounted StarterLEGENDAWG — American Wire GageN.C. — Normally ClosedN.O. — Normally OpenPR — Pilot RelayRLA — Rated Load AmpsST — Shunt TripTB — Terminal BlockRequired Power WiringRequired Control WiringOptions Wiring32