Carrier 50CR Installation Instructions Manual

Also see for Infinity 50CR Series: Owner's information manual

Contents

11Duct CoversA05301Fig. 11 -- 50CR with Duct Covers On1” (25mm) MIN.2” (50mm) MIN.TRAPOUTLETC99013Fig. 12 -- Condensate TrapStep 7—Install Electrical ConnectionsELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.The unit cabinet must have an uninterrupted, unbrokenelectrical ground to minimize the possibility of personal injuryif an electrical fault should occur. This ground may consist ofan electrical wire connected to the unit ground screw in thecontrol compartment, or conduit approved for electricalground when installed in accordance with NEC, ANSI/NFPAAmerican National Standards Institute/National FireProtection Association (latest edition) (in Canada, CanadianElectrical Code CSA C22.1) and local electrical codes.! WARNINGHIGH--VOLTAGE CONNECTIONSThe unit must have a separate electrical service with afield--supplied, waterproof disconnect switch mounted at, or withinsight from the unit. Refer to the unit rating plate, NEC and localcodes for maximum fuse/circuit breaker size and minimum circuitamps (ampacity) for wire sizing (See Table 2 for electrical data).The field--supplied disconnect may be mounted on the unit over thehigh--voltage inlet hole (See Fig. 6 and 7).If the unit has an electric heater, a second disconnect may berequired. Consult the Installation, Start--Up, and ServiceInstructions provided with the accessory for electrical serviceconnections.Operation of unit on improper line voltage constitutes abuse andmay cause unit damage that could affect warranty.UNIT COMPONENT DAMAGE HAZARDFailure to follow this caution may result in damage to the unitbeing installed.1. Make all electrical connections in accordance with NECANSI/NFPA (latest edition) and local electrical codesgoverning such wiring. In Canada, all electricalconnections must be in accordance with CSA standardC22.1 Canadian Electrical Code Part 1 and applicable localcodes. Refer to unit wiring diagram.2. Use only copper conductor for connections betweenfield--supplied electrical disconnect switch and unit. DONOT USE ALUMINUM WIRE.3. Be sure that high--voltage power to unit is within operatingvoltage range indicated on unit rating plate. On 3--phaseunits, ensure phases are balanced within 2 percent. Consultlocal power company for correction of improper voltageand/or phase imbalance.4. Insulate low--voltage wires for highest voltage containedwithin conduit when low--voltage control wires are in sameconduit as high--voltage wires.5. Do not damage internal components when drilling throughany panel to mount electrical hardware, conduit, etc.! CAUTIONROUTING POWER LEADS INTO UNITUse only copper wire between disconnect and unit. The highvoltage leads should be in a conduit until they enter the duct panel;conduit termination at the duct panel must be watertight. Run thehigh--voltage leads through the power entry knockout on the powerentry side panel. See Fig. 6 and 7 for location and size. Forsingle--phase units, connect leads to the black and yellow wires ; for3--phase units, connect the leads to the black, yellow, and blue wires.CONNECTING GROUND LEAD TO GROUND SCREWConnect the ground lead to the chassis using the ground screw in thewiring splice box (See Fig. 14 and 17).ROUTING CONTROL POWER WIRESFor detailed instruction on the low voltage connections to the UserInterface (UI), refer to the UI installation guide.Form a drip--loop with the control leads before routing them into theunit. Route the low voltage control leads through grommeted,low--voltage hole provided into unit (See Fig. 6 and 7). Connect userinterface leads to unit control power leads as shown in Fig. 14.The unit transformer supplies 24--v power for complete systemincluding accessory electrical heater. A fuse is provided in the 24--vcircuit on the control board (See Fig. 19); see the caution label onthe transformer. Transformer is factory wired for 230--v operation.If supply voltage is 208--v, rewire transformer primary as describedin Special Procedures for 208--v Operation section.50CR