Carrier AquaEdge 19XRV Installation Instructions 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

34Special Instructions to Disassemble a Chiller with a 900Aor 1200A LF2 VFD or Standard Tier VFD (765, 855, 960,1070, 1275, 1530A)NOTE: Label each wire before removal when wiring must bedisconnected. Clip all wire ties necessary when removing pres-sure and temperature sensors. Disconnect all pressure trans-ducer wires at the sensor. Temperature sensors cannot bedisconnected from their cables; remove temperature sensorsfrom their thermowells and label as required.Remove the VFD Enclosure from the Condenser — Confirmthat the power supply disconnect is open and all safety proce-dures are observed before removing the VFD. This procedureminimizes the number of sensors and cables that need to bedisconnected.1. Close the 2 filter drier isolation valves (Fig. 13) and theVFD refrigerant drain isolation valve. Evacuate the VFDcoldplate through the Schrader valve (Fig. 13) next to thefilter/drier.2. Remove any conduits that bring power to the VFD. SeeFig. 14.3. Remove the terminal box transition piece. See Fig. 15.4. Label and disconnect the motor leads from the motor orVFD terminals (Fig. 16 and 17). Note the position of themotor terminal cable lugs so they can be reinstalled withsufficient clearance away from the surrounding structure.When reinstalling the VFD, assemble the back panel,floor, and tray of the motor terminal box transition pieceprior to installing the motor leads.5. Remove the motor ground lead. Note the position of theground lead so it can be reinstalled with sufficient clear-ance away from the surrounding structure.6. Disconnect the power cables, interlock cable, and com-munication cable between the VFD enclosure and thepower panel. See Fig. 14.7. Remove the access panels on the back of the VFDenclosure and disconnect the VFD cooling lines (Fig. 18).Cover all openings.Lifting the VFD — Care should be used to prevent damage dueto dropping or jolting when moving the VFD enclosure. A forktruck or similar means of lifting and transporting may be used.Sling the VFD in a manner that will equalize the load at thepickup joints. Use a spreader bar if the angle of the sling is lessthan 45 degrees relative to the horizontal. Do not jolt whilelifting.NOTE: The two lifting brackets for the VFD are not installedwhen they are shipped. They are bolted upside down to thebottom of the VFD support shelf. They must be unbolted andinstalled on the top of the VFD enclosure with ten 1/2-13 x1.25-inch-long grade 5 bolts.Use the following procedure to lift the control center:1. Attach a sling to the 4 lifting holes in the installed liftingbrackets. Make certain that the angle of the sling is notless than 45 degrees relative to horizontal.2. Using an overhead or portable hoist (minimum 2-ton rat-ed capacity), attach a free-fall chain to the sling secureddrive. Take up any slack in the chain. See Fig. 19.3. The VFD support assembly can be removed from thecondenser if it is necessary to reduce the width of the con-denser assembly. The eight 11/8-7 bolts that secure theVFD support assembly to the tubesheets should betorqued to 750 ft-lb (1017 N-m) when the support assem-bly is reinstalled. See Fig. 20.NOTE: To reassemble, follow steps in reverse order. Connectsensors and cables after major components have been securedto reduce the risk of damaging them.NOTE: If overhead space is limited following reinstallation ofthe VFD enclosure, the VFD enclosure lifting brackets(Fig. 19) may be removed from the top of the VFD and fas-tened to the bottom of the VFD support shelf (Fig. 21).Reinstall the 1/2-13 x 1.25-inch-long grade 5 bolts into thetop of the VFD enclosure to prevent debris from falling into theVFD.WARNINGDo not attempt to disconnect flanges while the machine isunder pressure. Failure to relieve pressure can result in per-sonal injury or damage to the unit.WARNING900A or 1200A LF2 VFD, Standard Tier VFD (765, 855,960, 1070, 1275, 1530A) — Do not separate the cooler andcondenser until the VFD enclosure is removed. The VFD/cooler assembly has a high center of gravity and may tipover when the cooler and condenser are separated whichcould result in equipment damage and/or serious personalinjury. See Fig. 12.WARNINGDo not attempt to remove the VFD without first closing theVFD refrigerant isolation valves. Failure to do so duringVFD removal will result in an uncontrolled refrigerantleak. A refrigerant leak can damage the unit as well as dis-place oxygen, causing asphyxiation.WARNINGFig. 12 — Removal Warning Labela19-1701CAUTIONUse a backing wrench when removing the nuts and boltsthat secure the motor leads to the VFD bus bars to preventdamage to the bus bar insulators.