19XR (PIC II) Hermetic Centrifugal Liquid Chillers 50 Hz - Carrier

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Verify the flow and speed with the Electronic CATalogue selection program for the unit. Condenser Since this water circuit is usually an open-type system, the tubes may be subject to contamination and scale. Clean the condenser tubes with a rotary tube cleaning system at least once per year and more often if the water is contaminated. Inspect the entering and leaving condenser water sensors for signs of corrosion or scale. Replace the sensor if corroded or remove any scale if found. Verify the flow and speed with the Electronic CATalogue selection program for the unit. Higher than normal condenser pressures, together with the inability to reach full refrigeration load, usually indicate dirty tubes or air in the chiller. If the refrigeration log indicates a rise above normal condenser pressures, check the condenser refrigerant temperature against the leaving condenser water temperature. If this reading is more than what the design difference is supposed to be, then the condenser tubes may be dirty or water flow may be incorrect. Because HFC134-a is a high-pressure refrigerant, air usually does not enter the chiller. In certain cases where a zinc anode (option) is used, regularly check its condition. During the tube cleaning process, use brushes especially designed to avoid scraping and scratching the tube wall. Contact your <strong>Carrier</strong> representative to obtain these brushes. Do not use wire brushes. CAUTION: Hard scale may require chemical treatment for its prevention or removal. Consult a water treatment specialist for proper treatment. 7.3.12 - Water Leaks Water is indicated during chiller operation by the refrigerant moisture indicator (Fig. 2) on the refrigerant motor cooling line. Water leaks should be repaired immediately (see chapter 'Water treatment'). CAUTION: Chiller must be dehydrated after repair of water leaks. See Chiller Dehydration section. Water Treatment Untreated or improperly treated water may result in corrosion, scaling, erosion, or algae. The services of a qualified water treatment specialist should be obtained to develop and monitor a treatment program. CAUTION: Water must be within design flow limits, clean, and treated to ensure proper chiller performance and reduce the potential of tube damage due to corrosion, scaling, erosion, and algae. <strong>Carrier</strong> assumes no responsibility for chiller damage resulting from untreated or improperly treated water. 7.3.13 - Inspect the Starting Equipment Before working on any starter, shut off the chiller and open all disconnects supplying power to the starter. The disconnect on the starter front panel does not de-energize all internal circuits. Open all internal and remote disconnects before servicing the starter. Check the cable tightness. 54 WARNING: Never open isolating switches while equipment is operating. Electrical arcing can cause serious injury. Inspect starter contact surfaces for wear or pitting on mechanical-type starters. Do not sandpaper or file silverplated contacts. Follow the starter manufacturer’s instructions for contact replacement, lubrication, spare parts ordering, and other maintenance requirements. Periodically vacuum or blow off accumulated debris on the internal parts with a high-velocity, low-pressure blower. Power connections on newly installed starters may relax and loosen after a month of operation. Turn power off and retighten. Recheck annually thereafter. CAUTION: Loose power connections can cause voltage spikes, overheating, malfunctioning, or failures. 7.3.14 - Check Pressure Transducers Once a year, the pressure transducers should be checked against a pressure gauge reading. Check all four transducers: the 2 oil differential pressure transducers, the condenser pressure transducer, and the cooler pressure transducer, and the water-side evaporation probes (two on the condenser and two on the evaporator). Note the evaporator and condenser pressure readings on the CVC 'HEAT-EX' status screen. Attach an accurate set of refrigeration gauges to the cooler and condenser Schrader fittings. Compare the two readings. If there is a difference in readings, the transducer can be calibrated, as described in the Troubleshooting Guide section. Oil differential pressure should be zero whenever the compressor is off. 7.3.15 - Corrosion control All metallic parts of the unit (chassis, casing panels, control boxes, heat exchangers etc.) are protected against corrosion by a coating of powder or liquid paint. To prevent the risk of blistering corrosion that can appear when moisture penetrates under the protective coatings, it is necessary to carry out periodic checks of the coating (paint) condition.
X See view A Y See view B Z Thrust A High speed shaft 2-3-4 See table 1. Thrust Compressor transmission area View A - Low speed shaft thrust disk View B - High speed shaft Compressor assembly torques Item Description Torque Nm 1* Oil heater grommet nut 14 2 Motor terminals 68 3 Impeller retaining bolt 60-62 4* Demister bolts 20-26 5 Bull gear retaining bolt 108-115 6* Guide vane shaft seal nut 34 7 Motor terminals (high voltage) - Insulator 2.7-5.4 - Packing nut 6.8 Legend: * Not shown - Brass jam nut 13.6 Nm - Newton metres Notes: 1. All clearances for cylindrical surfaces are diametrical. 2. Dimensions are with rotor in thrust position. 3. Dimensions shown are in inches. 4. Impeller clearance to shroud: allows 0.024 in. forward movement from thrust position for Frame 3 compressors; 0.030 in. for Frame 4 compressors. 1. Thrust 2. See note 4 3. Impeller shimming to be determined at assembly Fig. 31 - Compressor fits and clearances 55
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19XR (PIC II) Hermetic Centrifugal
Page 3 and 4: TABLE OF CONTENTS (cont'd) 4 - BEFO
Page 5 and 6: INITIAL START-UP CHECKLIST FOR 19XR
Page 7 and 8: 19XR HERMETIC CENTRIFUGAL LIQUID CH
Page 9 and 10: 1 - SAFETY CONSIDERATIONS 19XR liqu
Page 11 and 12: 2 - INTRODUCTION AND CHILLER FAMILI
Page 13 and 14: The control centre: registers coole
Page 15 and 16: 1. Rear motor bearing 2. Forward mo
Page 17 and 18: 3 - INSTALLATION 3.1 - Introduction
Page 19 and 20: 3.3.3 - Physical data Table 1 Motor
Page 21 and 22: Maximum and minimum heat exchanger
Page 23 and 24: 1. Hot gas bypass (cut) 2. Compress
Page 25 and 26: 3.4 - Install machine supports Typi
Page 27 and 28: 1. Air vent 2. Leaving condenser wa
Page 29 and 30: 1a. Safety valve on machine 1b. Saf
Page 31 and 32: The control cabinet (standard unit)
Page 33 and 34: Electrical characteristics of the m
Page 35 and 36: 3.6.4 - Make the necessary connecti
Page 37 and 38: Insulate Motor Terminals and Lead W
Page 39 and 40: 4 - BEFORE INITIAL START-UP 4.1 - N
Page 41 and 42: h. Slowly raise the system pressure
Page 43 and 44: 6. Valve off the vacuum pump, stop
Page 45 and 46: The valve is opened counter-clockwi
Page 47 and 48: To return the chiller to normal con
Page 49 and 50: 49 Date: __________________________
Page 51 and 52: To pressurize with dry nitrogen Ano
Page 53: 7.3.5 - Refrigerant Filter A refrig
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19XR (PIC II) Hermetic Centrifugal Liquid Chillers 50 Hz - Carrier

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