Carrier 38CKC Installation Instructions Manual

Also see for 38CKC: Owner's manual Installation and start-up instructions Operating guide Product data Product data

Contents

4DISCONNECTPER N.E.C. AND/ORLOCAL CODESCONTACTORGROUNDLUGFIELD GROUNDWIRINGFIELD POWERWIRINGBLUE3 PHASE ONLYA94025Fig. 3 --- Line Power ConnectionsConnect Control WiringRoute 24v control wires through control wiring grommet andconnect leads to control wiring. (See Fig. 5.)Use No. 18 AWG color coded, insulated (35_C minimum) wire. Ifthermostat is located more than 100 ft (30.4 m) from unit, asmeasured along the control voltage wires, use No. 16 AWG colorcoded wire to avoid excessive voltage drop.Use furnace transformer, fan coil transformer, or accessorytransformer for control power, 24v/40va minimum.NOTE: Use of available 24v accessories may exceed theminimum 40va power requirement. Determine total transformerloading and increase the transformer capacity or split the load withan accessory transformer as required.COMPRESSOR CRANKCASE HEATERA crankcase heater is required if refrigerant tubing is longer than80 ft. (24.38 m).When equipped with a crankcase heater, energize heater aminimum of 24 hours before starting unit. To energize heater only,set thermostat to OFF mode and close electrical disconnect tooutdoor unit.INSTALL ELECTRICAL ACCESSORIESRefer to individual instructions packaged with kits or accessorieswhen installing.START--UPUNIT DAMAGE AND/OR PERSONAL INJURYHAZARDFailure to follow this caution may result in personal injuryand/or unit component damage.Service valve gauge ports are equipped with Schradervalves. Wear safety glasses and gloves when handlingrefrigerant.! CAUTION1. Fully open liquid and vapor service valves.2. Unit is shipped with valve stem(s) front seated (closed) andcaps installed. Replace stem caps after system is opened torefrigerant flow. Replace caps finger--tight and tighten anadditional 1/12” with wrench.3. Close electrical disconnects to energize system.4. Set room thermostat at desired temperature. Be sure setpoint is below indoor ambient temperature.5. Set room thermostat to COOL and fan control to ON orAUTO mode. Operate unit for 15 minutes. Check system--refrigerant charge. (See Check Charge.)PERSONAL INJURY and ENVIRONMENTALHAZARDFailure to relieve system pressure could result in personalinjury and/or death.1.Relieve pressure and recover all refrigerant beforeservicing existing equipment, and before final unitdisposal. Use all service ports and open all flow--controldevices, including solenoid valves.2.Federal regulations require that you do not ventrefrigerant into the atmosphere. Recover during systemrepair or final unit disposal.! WARNINGSEQUENCE OF OPERATIONTurn on power to indoor and outdoor units. Transformer isenergized.On a call for cooling, thermostat makes circuits R--Y and R--G.Three phase models with scroll compressors, are equipped with aphase monitor to detect if the incoming power is correctly phasedfor compressor operation. (See Fig. 4 and Table 2.) If the phasing iscorrect, circuit R--Y energizes contactor, starting outdoor fan motorand compressor circuit. R--G energizes indoor unit blower relay,starting indoor blower motor on high speed.NOTE: If the phasing is incorrect, the contactor will not beenergized. To correct the phasing, interchange any two of the threepower connections on the field side.When thermostat is satisfied, its contacts open, de--energizingcontactor and blower relay. Compressor and motors stop.If indoor unit is equipped with an off delay circuit, the indoorblower can run an additional 120 sec to increase system efficiency.A00010Fig. 4 --- 3 Phase Monitor ControlTable 2—Phase--Monitor LED IndicatorsLED STATUSOFF No call for compressor operationFLASHING Reversed phaseON Normal

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