Carrier 19XRV Start-up, Operation And Maintenance 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

80VFD Refrigerant Strainer — A refrigerant strainer islocated in the 5/8 in. line that supplies refrigerant to the VFD.The strainer should be replaced once a year or more often if thestrainer condition indicates a need for more frequent replace-ment. Change the filter by closing the refrigerant cooling lineisolation valves. Refrigerant pressure can be relieved throughaccess valves on the strainer housing. Tighten 5/8 flare nuts to55 to 66 ft-lb (75 to 89 Nm).Inspect Refrigerant Float System — Perform thisinspection every 5 years or when the condenser is opened forservice.1. Transfer the refrigerant into the cooler vessel or into apumpout storage tank.2. Remove the float access cover.3. Clean the chamber and valve assembly thoroughly. Besure the valve moves freely. Ensure that all openings arefree of obstructions.4. Examine the cover gasket and replace if necessary.See Fig. 42 for a view of the float valve design. For linearfloat valve designs, inspect the orientation of the float slide pin.It must be pointed toward the bubbler tube for proper operation.Inspect Relief Valves and Piping — The relief valveson this chiller protect the system against the potentially danger-ous effects of overpressure. To ensure against damage to theequipment and possible injury to personnel, these devices mustbe kept in peak operating condition.As a minimum, the following maintenance is required.1. At least once a year, disconnect the vent piping at thevalve outlet and carefully inspect the valve body andmechanism for any evidence of internal corrosion or rust,dirt, scale, leakage, etc.2. If corrosion or foreign material is found, do not attempt torepair or recondition. Replace the valve.3. If the chiller is installed in a corrosive atmosphere or therelief valves are vented into a corrosive atmosphere,inspect the relief valves at more frequent intervals.Compressor Bearing and Gear Maintenance —The key to good bearing and gear maintenance is properlubrication. Use the proper grade of oil, maintained atrecommended level, temperature, and pressure. Inspect thelubrication system regularly and thoroughly.Excessive bearing wear can sometimes be detected throughincreased vibration or increased bearing temperature. Gears,babbitted journal, and thrust bearings should be examined ap-proximately every five years for signs of wear based on the re-sults of the annual oil analysis. To inspect the bearings, a com-plete compressor teardown is required. Only a trained servicetechnician should remove and examine the bearings. The fre-quency of examination is determined by the hours of chiller op-eration, load conditions during operation, and the condition ofthe oil and the lubrication system. Rolling element bearings(Frame 3 compressor high speed shaft only) cannot be field in-spected; excessive vibration is the primary sign of wear ordamage. If either symptom appears, contact an experiencedand responsible service organization for assistance.Inspect the Heat Exchanger Tubes and FlowDevicesCOOLER AND OPTIONAL FLOW DEVICES — Inspect andclean the cooler tubes at the end of the first operating season.Because these tubes have internal ridges, a rotary-type tubecleaning system is needed to fully clean the tubes. Inspectthe tubes’ condition to determine the scheduled frequency forfuture cleaning and to determine whether water treatment in thechilled water/brine circuit is adequate. Inspect the entering andleaving chilled water temperature sensors and flow devices forsigns of corrosion or scale. Replace a sensor or Schrader fittingif corroded or remove any scale if found.CONDENSER AND OPTIONAL FLOW DEVICES —Since this water circuit is usually an open-type system, thetubes may be subject to contamination and scale. Clean thecondenser tubes with a rotary tube cleaning system at leastonce per year and more often if the water is contaminated.Inspect the entering and leaving condenser water sensors andflow devices for signs of corrosion or scale. Replace the sensoror Schrader fitting 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 a riseabove normal condenser pressures, check the condenser refrig-erant temperature against the leaving condenser water tempera-ture. If this reading is more than what the design difference issupposed to be, the condenser tubes may be dirty or water flowmay be incorrect. Because HFC-134a is a high-pressure refrig-erant, air usually does not enter the chiller.During the tube cleaning process, use brushes speciallydesigned to avoid scraping and scratching the tube wall.Contact a Carrier representative to obtain these brushes. Do notuse wire brushes.Water Leaks — The refrigerant moisture indicator on therefrigerant motor cooling line (Fig. 2) indicates whether thereis water leakage during chiller operation. Water leaks should berepaired immediately.Hard scale may require chemical treatment for its preven-tion or removal. Consult a water treatment specialist forproper treatment.The chiller must be dehydrated after repair of water leaks.See Chiller Dehydration section, page 61.12345678LEGENDFig. 42 — 19XRV Float Valve Design1 — Refrigerant Inlet from FLASC Chamber2 — Linear Float Assembly3 — Float Screen4 — Bubbler Line5 — Float Cover6 — Bubbler Line Connection7 — Refrigerant Outlet to Cooler8 — Gasketa23-1632