Carrier AquaEdge 19DV series Start-up, Operation And Maintenance Instructions Manual

Also see for AquaEdge 19DV series: Start-up, operation and maintenance instructions Installation, operation and maintenance instructions Installation instructions Controls operation and troubleshooting Operation and Troubleshooting

Carrier AquaEdge 19DV series Start-up, Operation And Maintenance Instructions Manual Manual pdf 43 page image

43Fig. 40 — Guide Vane Actuator Detail4. If required, rotate the guide vane sprocket fully clockwisefor first stage and counterclockwise for second stage andspot-drill the guide vane actuator shaft. Spot-drilling isnecessary when the guide vane actuator sprocket setscrews on the guide vane actuator shaft need to be re-seated. (Remember: Spot-drill and tighten the first setscrew before spot-drilling for the second set screw.)Trim Refrigerant Charge — If to obtain optimal chillerperformance it becomes necessary to adjust the refrigerantcharge, operate the chiller at design load and then add or re-move refrigerant slowly until the difference between the leav-ing chilled water temperature and the cooler refrigerant tem-perature reaches design conditions or becomes a minimum. Donot overcharge. Use cooler sight glasses to visually determineoptimum charge. At steady state full load operation the coolertubes should be covered with liquid refrigerant — if tubes arecovered maximum efficiency is achieved and there is no bene-fit of additional refrigerant.Refrigerant may be added either through the storage tank ordirectly into the chiller as described in the Charge Unit withRefrigerant section.To remove any excess refrigerant, follow the procedure inTransfer Refrigerant from Chiller to Pumpout Storage Tanksection.WEEKLY MAINTENANCECheck the Refrigerant Lubrication System1. Enter INPUT menu and verify that Liquid Level Switchis closed (if compressor is on).2. Check moisture indicating sight glass on bearing sup-ply line (Fig. 41) as well as on the motor/VFD liquidcooling line (located between vessels feeding of thehigh side float chamber; sight glass is located down-stream of filter drier).3. Check that pressure Ref Pump Delta P (PRESSUREMenu is above 13 psig [89.6 kPa]).Check for Leaks — Frequent purge pumpout operationis an indication of a leak. When the daily pumpout limit is ex-ceed, the controls will show process Alert 148 — Purge DailyPumpout Limit Exceeded. If no alert, the purge run-time for thepast 24 hours as well as the past 7 days can be obtained fromRUNTIME menu.SCHEDULED MAINTENANCEEstablish a regular maintenance schedule based on your actualchiller requirements such as chiller load, run hours, and waterquality. The time intervals listed in this section are offered asguides to service only.Service Ontime — The HMI will display a resettable“After Service Hrs”, “Total Pumpout Numbers”, and “TotalPumpout Time” value on the MAIN MENU  RUN TIMESscreen. These values should be reset to zero by the service per-son or the operator each time major service work is completedso that the time between service events can be viewed andtracked. Previous values and associated dates should be loggedfor future reference prior to resetting.Inspect the Control Panel — Maintenance consists ofgeneral cleaning and tightening of connections. Vacuum thecontrol cabinets to eliminate dust build-up. If the chiller controlmalfunctions, refer to the Troubleshooting Guide section onpage 46 for control checks and adjustments.NOTE: For first stage, rotate coupling clockwise to closeguide vanes; rotate coupling counterclockwise to openguide vanes. For second stage, rotate coupling counter-clockwise to close guide vanes; rotate coupling clockwiseto open guide vanes.WARNINGEnsure power to the starter is isolated when cleaning andtightening connections inside the starter enclosure. Failureto disconnect power could result in electrocution.