Carrier 50VL-A Performance Installation Instructions Manual

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Contents

10POWERSUPPLYFIELD-SUPPLIEDFUSED DISCONNECTHIGH VOLTAGEPOWER LEADS(SEE UNIT WIRINGLABEL)EQUIP GRCONTROL BOXLOW-VOLTAGEPOWER LEADS(SEE UNITWIRING LABEL)W1YGRCWHT(W1)YEL(Y)GRN(G)RED(R)BRN(C)THERMOSTAT(TYPICAL)3-PHASE SHOWN1-PHASE USESTWO POWERLEADSW2VIO (W2)SPLICE BOXDHBLU (DH)GRA (Y2) 3-PhaseOnlyA09066Fig. 10 -- High-- and Control--Voltage Connections5. Connect field wire L2 to yellow wire on connection 23 ofthe compressor contactor.Three--phase units:1. Run the high--voltage (L1, L2, L3) and ground lead into thecontrol box.2. Connect ground lead to chassis ground connection.3. Locate the black and yellow wires connected to the line sideof the contactor.4. Connect field L1 to black wire on connection 11 of thecompressor contactor.5. Connect field wire L3 to yellow wire on connection 13 ofthe compressor contactor.6. Connect field wire L2 to blue wire from compressor.SPECIAL PROCEDURES FOR 208--V OPERATIONELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury or death.Before installing or servicing system, always turn off mainpower to system and install lockout tag. With disconnectswitch open, move black wire from transformer (3/16in.)(4.8 mm) terminal marked 230 to terminal marked 208.This retaps transformer to primary voltage of 208 vac.! WARNINGCONTROL VOLTAGE CONNECTIONSNOTE: Do not use any type of power--stealing thermostat. Unitcontrol problems may result.Use no. 18 American Wire Gage (AWG) color--coded, insulated(35°C minimum) wires to make the control voltage connectionsbetween the thermostat and the unit. If the thermostat is locatedmore than 100 ft (30.5 m) from the unit (as measured along thecontrol voltage wires), use no. 16 AWG color--coded, insulated(35° C minimum) wires.STANDARD CONNECTIONLocate the seven (eight for 3--phase) low voltage thermostat leadsin 24 volt splice box. A gray wire is standard on 3--phase units forconnection to an economizer. See Fig. 10 for connection diagram.Run the low--voltage leads from the thermostat, through the controlwiring inlet hole grommet (Fig. 2 and 3), and into the low--voltagesplice box. Provide a drip loop before running wires through panel.Secure and strain relief all wires so that they do not interfere withoperation of unit.If an accessory electric heater is installed, low voltage leads fromheater must be connected to factory supplied control leads fromIndoor Fan Board P4 connector. Factory wires are provided forelectric heat staging W1 and W2 (W2 and W3 on IFB). If roomthermostat has only one stage of supplemental heat, connect whiteand violet wires shown in Fig. 10 to second stage heat field wire.Some electric heaters have four control wires (plus common wire).Consult unit wiring diagram and electric heater wiring diagram foradditional details.TRANSFORMER PROTECTIONThe transformer is of the energy--limiting type, however a directshort will likely blow a secondary fuse. If an overload or short ispresent, correct overload condition and check for blower fuse onIndoor Fan Board. Replace fuse as required with correct size andrating.50VL-- A