Carrier 19XR Start-up, Operation And Maintenance Instructions Manual

Also see for HERMETIC CENTRIFUGAL LIQUID CHILLERS 19XR: User manual Start-up and service instructions Installation instructions Product data Installation instructions

Contents

Carrier 19XR Start-up, Operation And Maintenance Instructions Manual Manual pdf 68 page image

chiller operation, load conditions during operation, and thecondition of the oil and the lubrication system. Excessivebearing wear can sometimes be detected through increasedvibration or increased bearing temperature. If either symp-tom appears, contact an experienced and responsible serviceorganization for assistance.Inspect the Heat Exchanger Tubes and FlowDevicesCOOLER AND FLOW DEVICES — Inspect and clean thecooler tubes at the end of the first operating season. Becausethese tubes have internal ridges, a rotary-type tube cleaningsystem is needed to fully clean the tubes. Inspect the tubes’condition to determine the scheduled frequency for futurecleaning and to determine whether water treatment in thechilled water/brine circuit is adequate. Inspect the enteringand leaving chilled water temperature sensors and flow de-vices for signs of corrosion or scale. Replace a sensor orSchrader fitting if corroded or remove any scale if found.CONDENSER AND FLOW DEVICES — Since this watercircuit is usually an open-type system, the tubes may be sub-ject to contamination and scale. Clean the condenser tubeswith a rotary tube cleaning system at least once per year andmore often if the water is contaminated. Inspect the enteringand leaving condenser water sensors and flow devices forsigns of corrosion or scale. Replace the sensor or Schraderfitting if corroded or remove any scale if found.Higher than normal condenser pressures, together with theinability to reach full refrigeration load, usually indicate dirtytubes or air in the chiller. If the refrigeration log indicates arise above normal condenser pressures, check the condenserrefrigerant temperature against the leaving condenser watertemperature. If this reading is more than what the design dif-ference is supposed to be, the condenser tubes may be dirtyor water flow may be incorrect. Because HFC-134a is a high-pressure refrigerant, air usually does not enter the chiller.During the tube cleaning process, use brushes speciallydesigned to avoid scraping and scratching the tube wall. Con-tact your Carrier representative to obtain these brushes. Donot use wire brushes.Hard scale may require chemical treatment for its pre-vention or removal. Consult a water treatment specialistfor proper treatment.Water Leaks — The refrigerant moisture indicator onthe refrigerant motor cooling line (Fig. 2) indicates whetherthere is water leakage during chiller operation. Water leaksshould be repaired immediately.The chiller must be dehydrated after repair of water leaks.See Chiller Dehydration section, page 51.Water Treatment — Untreated or improperly treatedwater may result in corrosion, scaling, erosion, or algae. Theservices of a qualified water treatment specialist should beobtained to develop and monitor a treatment program.Water must be within design flow limits, clean, and treatedto ensure proper chiller performance and reduce thepotential of tube damage due to corrosion, scaling, ero-sion, and algae. Carrier assumes no responsibility forchiller damage resulting from untreated or improperlytreated water.Inspect the Starting Equipment — Before work-ing on any starter, shut off the chiller and open all discon-nects supplying power to the starter.The disconnect on the starter front panel does not de-energize all internal circuits. Open all internal andremote disconnects before servicing the starter.Never open isolating knife switches while equipment isoperating. Electrical arcing can cause serious injury.Inspect starter contact surfaces for wear or pittingon mechanical-type starters. Do not sandpaper or filesilverplated contacts. Follow the starter manufacturer’sinstructions for contact replacement, lubrication, spare partsordering, and other maintenance requirements.Periodically vacuum or blow off accumulated debris onthe internal parts with a high-velocity, low-pressure blower.Power connections on newly installed starters may relaxand loosen after a month of operation. Turn power off andretighten. Recheck annually thereafter.Loose power connections can cause voltage spikes, over-heating, malfunctioning, or failures.Check Pressure Transducers — Once a year, thepressure transducers should be checked against a pressuregage reading. Check all eight transducers: the 2 oil differ-ential pressure transducers, the condenser pressuretransducer, the cooler pressure transducer, and the watersidepressure transducers (consisting of 4 flow devices: 2 cooler,2 condenser).Note the evaporator and condenser pressure readings onthe HEAT_EX screen on the CVC (EVAPORATOR PRES-SURE and CONDENSER PRESSURE). Attach an accurateset of refrigeration gages to the cooler and condenser Schraderfittings. Compare the two readings. If there is a difference inreadings, the transducer can be calibrated as described in theTroubleshooting Guide section. Oil differential pressure (OILPUMP DELTA P on the COMPRESS screen) should be zerowhenever the compressor is off.Optional Pumpout System Maintenance — Forpumpout unit compressor maintenance details, refer to the06D, 07D Installation, Start-Up, and Service Instructions.OPTIONAL PUMPOUT COMPRESSOR OIL CHARGE —Use oil conforming to Carrier specifications for reciprocat-ing compressor usage. Oil requirements are as follows:ISO Viscosity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68Carrier Part Number . . . . . . . . . . . . . . . . . . . . PP23BZ103The total oil charge, 4.5 pints (2.6 L), consists of3.5 pints (2.0 L) for the compressor and one additional pint(0.6 L) for the oil separator.Oil should be visible in one of the compressor sight glassesduring both operation and at shutdown. Always check theoil level before operating the compressor. Before adding orchanging oil, relieve the refrigerant pressure as follows:1. Attach a pressure gage to the gage port of either com-pressor service valve (Fig. 33).68