Carrier AquaEdge 19XRV series Operation, Maintenance And Installation Manual

Also see for AquaEdge 19XRV series: Start-up, operation and maintenance instructions Start-up and service instructions Installation instructions Start-up, operation and maintenance instructions Start-up and service instructions

Contents

72Inspect Wiring1. Examine the wiring for conformance to the job wiringdiagrams and all applicable electrical codes.2. Connect a voltmeter across the power wires to the VFDand measure the phase to phase and phase to groundvoltage. Compare this reading to the voltage rating on thecompressor and VFD nameplates.3. Compare the ampere rating on the VFD enclosurenameplate to the rating on the compressor nameplate.4. The VFD must be wired to components and terminalsrequired for PIC III refrigeration control. Check line sidepower and for control components shown on the CertifiedPrints. The VFD must share control of cooler and con-denser liquid pumps and cooling tower fans.5. Check the phase to phase and phase to ground linevoltage to the VFD, power panel, and optional pumpoutcompressor. Compare voltages against nameplate values.6. Ensure that fused disconnects or circuit breakers havebeen supplied to the VFD and optional pumpout unit.7. Ensure all electrical equipment and controls are properlygrounded in accordance with the job drawings, certifieddrawings, and all applicable electrical codes.8. Ensure the customer's contractor has verified proper oper-ation of the pumps, cooling tower fans, and associatedauxiliary equipment. This includes ensuring motors areproperly lubricated and have proper electrical supply andproper rotation.9. Tighten all wiring connections on the high and lowvoltage terminal blocks in the VFD enclosure below thecontrol panel.10. Inspect the power panel and VFD enclosure to ensure thatthe contractor has used the knockouts to feed the wiresinto the back of the enclosures. Wiring into the top of theenclosures can allow debris to fall into the enclosures.Clean and inspect the interior of the power panel andVFD enclosure if this has occurred.Ground Fault Troubleshooting — Follow this pro-cedure only if ground faults are declared by the chiller controls.Test the chiller compressor motor and its power leadinsulation resistance with a 500-v insulation tester such as amegohmmeter.1. Open the VFD main disconnect switch and followlockout/tagout rules.2. With the tester connected to the motor leads, take10-second and 60-second megohm readings as follows:Tie terminals 1, 2, and 3 together and test between thegroup and ground.3. Divide the 60-second resistance reading by the 10-secondreading. The ratio, or polarization index, must be one orhigher. Both the 10 and 60-second readings must be atleast 50 megohms.If the readings are unsatisfactory, repeat the test at themotor with the power leads disconnected. Satisfactoryreadings in this second test indicate the fault is in thepower leads.Carrier Comfort Network® Interface — The Carri-er Comfort Network (CCN) communication bus wiring issupplied and installed by the electrical contractor. It consists ofshielded, 3-conductor cable with drain wire.The system elements are connected to the communicationbus in a daisy chain arrangement. The positive pin of eachsystem element communication connector must be wired to thepositive pins of the system element on either side of it. Thenegative pins must be wired to the negative pins. The signalground pins must be wired to the signal ground pins. Seeinstallation manual.NOTE: Conductors and drain wire must be 20 AWG(American Wire Gage) minimum stranded, tinned copper.Individual conductors must be insulated with PVC, PVC/nylon, vinyl, Teflon*, or polyethylene. An aluminum/polyester100% foil shield and an outer jacket of PVC, PVC/nylon,chrome vinyl, or Teflon with a minimum operating tempera-ture range of –4 F to 140 F (–20 C to 60 C) is required. Seetable below for cables that meet the requirements.When connecting the CCN communication bus to a systemelement, a color code system for the entire network is recom-mended to simplify installation and checkout. The followingcolor code is recommended:Power Up the Controls and Check the OilHeater — Ensure that an oil level is visible in the compres-sor before energizing the controls. A circuit breaker in theVFD energizes the oil heater and the control circuit. When firstpowered, the ICVC should display the default screen within ashort period of time.The oil heater is energized by powering the control circuit.This should be done several hours before start-up to minimizeoil-refrigerant migration. The oil heater is controlled by thePIC III and is powered through a contactor in the power panel.A separate circuit breaker powers the heater and the controlcircuit. This arrangement allows the heater to energize whenthe main motor circuit breaker is off for service work orextended shutdowns. The oil heater relay status (OIL HEATERRELAY) can be viewed on the COMPRESS table on the ICVC.Oil sump temperature can be viewed on the ICVC defaultscreen.WARNINGDo not check the voltage supply without proper equipmentand precautions. Serious personal injury may result. Followpower company recommendations.CAUTIONDo not apply any kind of test voltage, even for a rotationcheck, if the chiller is under a dehydration vacuum. Insula-tion breakdown and serious damage may result.WARNINGDo not apply power unless a qualified Carrier technician ispresent. Serious personal injury may result.CAUTIONThe motor leads must be disconnected from the VFDbefore an insulation test is performed. The voltagegenerated from the tester can damage the VFD.MANUFACTURER CABLE NO.ALPHA 2413 or 5463AMERICAN A22503BELDEN 8772COLUMBIA 02525SIGNALTYPECCN BUSCONDUCTORINSULATIONCOLORCCNTERMINALCONNECTIONICVC PLUG J1PIN NO.+ Red RED (+) 1GROUND White WHITE (G) 2– Black BLACK (–) 3*Teflon is a registered trademark of Dupont.