York MaxE YK Series Operating & Maintenance
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York MaxE YK Series Operating & Maintenance

York MaxE YK Series Operating & Maintenance

R-134a centrifugal liquid chillers with optiviewtm control center for electro-mechanical starter, solid state starter & variable speed drive
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M
E
TM
AX
CENTRIFUGAL LIQUID CHILLERS
OPERATING & MAINTENANCE
Supersedes: NOTHING
Form 160.54-O2 (1102)
MODEL YK (STYLE E)
R-134a COOLING ONLY
WITH OPTIVIEW
CONTROL CENTER
TM
FOR ELECTRO-MECHANICAL STARTER,
SOLID STATE STARTER & VARIABLE SPEED DRIVE
00611VIP
LDO5842

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Summary of Contents for York MaxE YK Series

  • Page 1 CENTRIFUGAL LIQUID CHILLERS OPERATING & MAINTENANCE Supersedes: NOTHING Form 160.54-O2 (1102) MODEL YK (STYLE E) R-134a COOLING ONLY WITH OPTIVIEW CONTROL CENTER FOR ELECTRO-MECHANICAL STARTER, SOLID STATE STARTER & VARIABLE SPEED DRIVE 00611VIP LDO5842...
  • Page 2 NOT be installed inside the micro panel. NO external wiring is allowed to be run through the micro panel. All wiring must be in accordance with YORK’s published specifications and must be performed ONLY by qualified YORK personnel. YORK will not be responsible for damages/problems resulting from improper connections to the controls or application of improper control signals.
  • Page 3 If there is any question in the While YORK makes no commitment to update or mind of operating/service personnel as to the appli- provide current information automatically to the...

  • Page 4: Table Of Contents

    SECTION Description of System and Fundamentals of Operation....... 7 SECTION System Operating Procedures ..............9 SECTION System Components Description ............... 15 SECTION Operational Maintenance ................21 SECTION Troubleshooting..................23 SECTION Maintenance ....................25 SECTION Preventive Maintenance ................34 YORK INTERNATIONAL...
  • Page 5 FIG. 10 – EVACUATION OF CHILLER ......22 FIG. 11 – SYSTEM PRESSURES........25 FIG. 12 – SATURATION CURVE ........27 FIG. 13 – DIAGRAM - MEGGING MOTOR WINDINGS ..29 FIG. 14 – MOTOR STATOR TEMPERATURE & INSULATION RESISTANCE ......30 YORK INTERNATIONAL...

  • Page 6: Fig. 1 - Model Yk Maxe

    FIG. 1 – MODEL YK CHILLER EVAPORATOR SYSTEM OPERATION DESCRIPTION (SEE FIG. 2) starter, YORK Solid State Starter (optional), or Vari- able Speed Drive (optional). The YORK Model YK MaxE Chiller is commonly There could be either of two different Solid State applied to large air conditioning systems, but may be Starters applied.

  • Page 7: Section 1 Description Of System And Fundamentals Of Operation

    The warmed liquid is then with vanes wide open to minimum load with vanes returned to the chiller to complete the chilled liquid completely closed. circuit. YORK INTERNATIONAL...
  • Page 8 FORM 160.54-O2(1102) COMPRESSOR PREROTATION VANES (See Detail A) DISCHARGE SUCTION DISCHARGE BAFFLE EVAPORATOR CONDENSER ELIMINATOR SUB-COOLER FLOW CONTROL ORIFICE LD00924 OIL COOLER FIG. 2 – REFRIGERANT FLOW-THRU CHILLER YORK INTERNATIONAL...

  • Page 9: Section 2 System Operating Procedures

    All pump is wired to the Microcomputer Control Cen- Control Center setpoints should be programmed ter the pump will automatically start, therefore, before the chiller is started. (Refer to Form this step is not necessary. 160.54-O1). YORK INTERNATIONAL...

  • Page 10: Fig. 3 - Chiller Starting Sequence & Shutdown Sequence (Em Starter & Solid State Starter)

    1. The OptiView Control Center display message refer to Form 160.54-O1. LD04040 NOT FOR ALL SHUTDOWNS. REFER TO “DISPLAY MES- SAGES” SECTION OF THIS MANUAL. FIG. 3 – CHILLER STARTING SEQUENCE & SHUTDOWN SEQUENCE (EM STARTER & SOLID STATE STARTER) YORK INTERNATIONAL...

  • Page 11: Vanes

    CONDENSER WATER TEMPERATURE CONTROL ing chilled liquid temperature. The unit capacity will vary to maintain the leaving CHILLED LIQUID The YORK MaxE chiller is designed to use less TEMPERATURE setpoint. The Prerotation Vanes power by taking advantage of lower than design...

  • Page 12: Fig. 5 - Liquid Chiller Log Sheets

    An optional status printer is available for this purpose oil level should be between the upper and lower or Fig. 5 shows a log sheet used by YORK Personnel sight glasses. Drain or add oil if necessary. for recording test data on chiller systems. It is avail- 3.
  • Page 13 Quarterly call the nearest YORK District Office. Failure to report constant troubles could damage the unit and 1. Perform chemical analysis of oil.
  • Page 14 4. Open the main disconnect switches to the com- from the cooling tower, condenser, condenser pressor motor, condenser water pump and the pump, and the chilled water system-chilled water chilled water pump. Open the 115 volt circuit to pump and coils. the Control Center. YORK INTERNATIONAL...

  • Page 15: Section 3 System Components Description

    FORM 160.54-O2(1102) SECTION 3 SYSTEM COMPONENTS DESCRIPTION OPTIVIEW CONTROL CENTER COMPRESSOR SUCTION DUAL RELIEF VALVES MOTOR EVAPORATOR 00611vip REFRIGERANT CHARGING VALVE VARIABLE SPEED OIL PUMP CONTROL SIGHT GLASS FRONT VIEW FIG. 6 – SYSTEM COMPONENTS YORK INTERNATIONAL...

  • Page 16: Fig. 7 - Schematic Drawing (Yk) Compressor Lubrication System

    System Components Description FORM 160.54-O2(1102) DISCHARGE LINE 28778A OIL RESERVOIR PUMP OIL COOLER REAR VIEW FIG. 7 – SYSTEM COMPONENTS (CONT’D) YORK INTERNATIONAL...
  • Page 17 FORM 160.54-O2(1102) 1. Compressor Drive Shaft (Low Speed) GENERAL a. Shaft seal. The YORK Model YK MaxE Centrifugal Liquid b. Front and rear journal bearings – one on each Chiller is completely factory-packaged including evapo- side of driving gear. rator, condenser, compressor, motor, lubrication system, c.

  • Page 18: Fig. 8 - Oil Return System

    System Components Description FORM 160.54-O2(1102) DOUBLE BELLOWS SHAFT SEAL LOW SPEED GEAR REAR BEARING FIG. 8 – SCHEMATIC DRAWING – (YK) COMPRESSOR LUBRICATION SYSTEM LD08577 YORK INTERNATIONAL...
  • Page 19 225 PSIG (1551 kPa). The compressor motor is an open-drip-proof, squir- Integral steel water baffles provide the required pass rel cage, induction type constructed to YORK design arrangements. Stub-out water nozzle connections specifications. 60 hertz motors operate at 3570 rpm.
  • Page 20 The OptiView control panel will automati- cally modulate the hot gas valve open and closed as required. Adjustment of the hot gas control valve must be performed by a qualified service technician fol- lowing the Hot Gas Set-up procedure. YORK INTERNATIONAL...

  • Page 21: Section 4 Operational Maintenance

    To change the dehydrator, use the following pro- cedure: COMPRESSOR SOLENOID VALVE CHECK VALVE OIL EDUCTOR BLOCK SOLENOID VALVE DEHYDRATOR STOP VALVE STOP VALVE LD08578 FIG. 9 – OIL RETURN SYSTEM YORK INTERNATIONAL...

  • Page 22: Fig. 10 - Evacuation Of Chiller

    New YORK Refrigeration oil must be used in the cen- This fills the lines with oil and prevents air from trifugal compressor.

  • Page 23: Section 5 Troubleshooting

    4. SYMPTOM: NO OIL PRESSURE WHEN SYSTEM START BUTTON PUSHED Low oil pressure displayed on control Oil pump running in wrong Check rotation of oil pump center; compressor will not start. direction. (Electrical Connections). Oil pump not running. Troubleshoot electrical problem with oil pump VSD. YORK INTERNATIONAL...
  • Page 24 10. SYMPTOM: OIL PUMP FAILS TO DELIVER OIL PRESSURE No oil pressure registers when pressing Faulty oil pressure Replace oil pressure transducer. transducer OIL PRESSURE display key when oil pump runs. Faulty wiring/connectors. YORK INTERNATIONAL...

  • Page 25: Section 6 Maintenance

    To test with R-22, proceed as follows: For any required Renewal Parts, refer to YORK Re- newal Parts Unit Components Manual 160.73-RP1. 1. With no pressure in the system, charge R-22 gas into the system through the charging valve to a pressure of 2 PSIG (14 kPa).
  • Page 26 Step 6 above, the leak must be under pressure and the evaporator head drain con- found and repaired. nection, out the evaporator vent connection, into YORK INTERNATIONAL...

  • Page 27: Fig. 12 - Saturation Curve

    When this final vaporization has lowed to fall to 32°F (0°C), the water in the test tube taken place the pressure and temperature will continue will freeze, and the result will be a faulty temperature reading. YORK INTERNATIONAL...
  • Page 28 “Refrigerant Charging”, above. The refrigerant level should be observed and the level The refrigerant charge level must be checked after the recorded after initial charging. pressure and temperature have equalized between the YORK INTERNATIONAL...

  • Page 29: Fig. 13 - Diagram, Megging Motor Windings

    (See Fig. 13); 24 hours of idle standby. these readings are to be interpreted using the graph shown in Fig. 14. LD00475 FIG. 13 – DIAGRAM, MEGGING MOTOR WINDINGS YORK INTERNATIONAL...

  • Page 30: Fig. 14 - Motor Stator Temperature & Insulation Resistance

    Maintenance FORM 160.54-O2(1102) LD00476 TEMPERATURE – °F FIG. 14 – MOTOR STARTER TEMPERATURE AND INSULATION RESISTANCES YORK INTERNATIONAL...
  • Page 31 These symptoms may also be due to foul gas buildup. Purging will remove the programs to eliminate future prob- foul gas revealing the effect of fouling. lems. YORK INTERNATIONAL...
  • Page 32 If acid cleaning is required, the tube. Pressurize the dry system with 50 to 100 YORK recommends the use of this type of organiza- PSIG (345 to 690 kPa) of nitrogen. Repeat this tion. The Dow Industries Service Division of the Dow...
  • Page 33 YORK office to request the presence of a YORK Service Technician. ELECTRICAL CONTROLS For information covering the OptiView™...

  • Page 34: Section 7 Preventive Maintenance

    Frames 284T thru 587UZ are furnished with double the warranty period; YORK will not be liable for shielded or open ball or roller bearings. It is neces- costs incurred to return the system to satisfactory sary to re-lubricate anti-friction bearings periodically.
  • Page 35 (operation and safety) not be changed. If the set- condition. tings are changed without YORK’s approval, the warranty will be jeopardized. The use of untreated water in cooling towers, closed water systems, etc.
  • Page 36 SI METRIC CONVERSION P.O. Box 1592, York, Pennsylvania USA 17405-1592 Tele. 800-861-1001 Subject to change without notice. Printed in USA Copyright © by York International Corporation 2002 www.york.com ALL RIGHTS RESERVED Form 160.54-O2 (1102) Supersedes: NOTHING...

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