Carrier 50JZ024 Installation, Start-up And Service Instructions Manual

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Contents

condensate connection to ensure proper drainage. Make sure thatthe outlet of the trap is at least 1 in. lower than the drain-pancondensate connection to prevent the pan from overflowing. Primethe trap with water. When using a gravel apron, make sure it slopesaway from the unit.If the installation requires draining the condensate water awayfrom the unit, install a field-supplied 2-in. trap at the condensateconnection to ensure proper drainage. Condensate trap is availableas an accessory or is field-supplied. Make sure that the outlet of thetrap is at least 1 in. lower than the unit drain-pan condensateconnection to prevent the pan from overflowing. Connect a draintrough using a minimum of field-supplied 3/4-in. PVC or field-supplied 3/4 -in. copper pipe at outlet end of the 2-in. trap (Fig.11). Do not undersize the tube. Pitch the drain trough downward ata slope of at least 1 in. every 10 ft of horizontal run. Be sure tocheck the drain trough for leaks. Prime the trap at the beginning ofthe cooling season start-up.Step 7—Install Electrical ConnectionsThe unit cabinet must have an uninterrupted, unbrokenelectrical ground to minimize the possibility of personalinjury if an electrical fault should occur. This ground mayconsist of an electrical wire connected to the unit ground lugin the control compartment, or conduit approved for electricalground when installed in accordance with NEC, ANSI/NFPAAmerican National Standards Institute/National Fire Protec-tion Association (latest edition) (in Canada, Canadian Elec-trical Code CSA C22.1) and local electrical codes. Failure toadhere to this warning could result in serious injury or death.Failure to follow these precautions could result in damage tothe unit being installed:1. Make all electrical connections in accordance with NECANSI/NFPA (latest edition) and local electrical codesgoverning such wiring. In Canada, all electrical connec-tions must be in accordance with CSA standard C22.1Canadian 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%. Consult localpower company for correction of improper voltage and/orphase 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.HIGH-VOLTAGE CONNECTIONS — The unit must have aseparate electrical service with a field-supplied, waterproof dis-connect switch mounted at, or within sight from the unit. Refer tothe unit rating plate, NEC and local codes for maximumfuse/circuit breaker size and minimum circuit amps (ampacity) forwire sizing. See Table 3 for electrical data.The field-supplied disconnect may be mounted on the unit over thehigh-voltage inlet hole (See Fig. 2 and 3).If the unit has an electric heater, a second disconnect may berequired. Consult the Installation, Start-Up and Service Instruc-tions provided with the accessory for electrical service connec-tions.Operation of unit on improper line voltage constitutes abuse andmay cause unit damage that could affect warranty.ROUTING POWER LEADS INTO UNIT — Use only copperwire between disconnect and unit. The high-voltage leads shouldbe in a conduit until they enter the duct panel; conduit terminationat the duct panel must be watertight. Run the high-voltage leadsthrough the power entry knockout on the power entry side panel(See Fig. 2 and 3 for location and size). When the leads are insidethe unit, run leads up the high-voltage raceway to the line wiringsplice box (Fig. 12 through 14). For single-phase units, connectleads to the black and yellow wires; for 3-phase units, connect theleads to the black, yellow, and blue wires (Fig. 17).CONNECTING GROUND LEAD TO GROUND LUG — Referto Fig. 17. Connect the ground lead to the chassis using the groundlug in the wiring splice box.ROUTING CONTROL POWER WIRES (24V) — Form a drip-loop with the thermostat leads before routing them into the unit.Route the thermostat leads through grommeted, low-voltage holeprovided in unit into unit control power splice box (See Fig. 2 and3). Connect thermostat leads to unit control power leads as shownin Fig. 16.The unit transformer supplies 24v power for complete systemincluding accessory electrical heater. An automatic-reset circuitbreaker (Fig. 18) is provided in the 24v circuit; see the cautionlabel on the transformer or Fig. 19. Transformer is factory wiredfor 230v operation. If supply voltage is 208v, rewire transformerprimary as described in Special Procedures for 208v Operationsection.Fig. 11—Condensate TrapC990131” MIN.2” MIN.TRAPOUTLET8