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

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Carrier 19XRV Start-up, Operation And Maintenance Instructions Manual Manual pdf 77 page image

VFD Refrigerant Strainer -- A t_efiigerant strainer islocated in the 5/8 in. line that supplies refiigerant to the VFD.The strainer should be replaced once a year or more often if thestr;dner condition indicates a need for mote ft_equent replace-ment. Change the filter by closing the refrigerant cooling lineisolation valves. Refiigerant 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 -- Perforln 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 covet:3. Clean the chamber and valve assembly thoroughly. Besure the valve moves fieely. Ensure that all openings arefiee of obstructions.4. Examine the cover gasket and replace if necessmy.See Fig. 42 for a view of the float v_dve 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 v_dveson this chiller protect the system against the potentially danger-ous effects of overpressure. To ensure against dalnage 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 yeat: disconnect the vent piping at thevalve outlet and catefttlly inspect the valve body andmechanism for any evidence of interned corrosion or rest,dirt, sc_de, 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 v_dves ate vented into a corrosive atmosphere,inspect the relief valves at more fiequent 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 beating were can sometimes be detected throughincreased vibration or increased beating temperature. Gearsand babbitted joumal and thrust bearings should be exalninedapproximately every five years for signs of wear based on theresults of the annual oil analysis. To inspect the bearings, acomplete compressor teatdown is required. Only a trained set-vice technician should remove and examine the bearings. Thefiequency of exalnination is determined by the hours of chilleroperation, load conditions during opetafion, and the conditionof the oil and the lubrication system. Rolling element bearings(Frmne 3 compressor high speed shaft only) cannot be field in-spected; excessive vibration is the primary sign of wear ordamage. If either symptom appems, 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 cle_ming 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 Schmder 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 rotmy tube cleaning system at leastonce per yetu 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 foundiHigher than normal condenser pressures, together with theinability to reach full refiigeration load, usually indicate dittytubes or air in the chillet: If the refiigeration log indicates a riseabove normal condenser pressures, check the condenser refiig-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 ditty or water flowmay be incorrect. Because HFC-134a is a high-pressure refiig-etant, air usually does not enter the chillerDuring 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.Hard scale may require chemic_d treatment for its preven-tion or removal. Consult a water treatment specialist forproper treatment.Water Leaks -- The refiigerant moisture indicator on therefiigetant motor cooling line (Fig. 2) indicates whether thereis water leakage during chiller operation. Water leaks should berepaired immediately.The chiller must be dehydi'ated after repair of water leaks.See Chiller Dehydi'ation section, page 58.1 28 7LEGEND1 -- Refrigerant Inlet from FLASC Chamber2 -- Linear Float Assembly3 -- Float Screen4 -- Bubble Line5 -- Float Cover6 -- Bubble Line Connection7 -- Refrigerant Outlet to Cooler8 -- GasketFig. 42 -- 19XRV Float Valve Design77