York YK M3 M3 G4 operation manual Operating Inspections See Section, Daily, Weekly, Quarterly

Page 34

YORK office. Automatic data logging is possible by connecting the optional printer and programming the DATA LOGGER function; refer to Form 160.49-N7.

An accurate record of readings serves as a valuable reference for operating the system. Readings taken when a system is newly installed will establish normal conditions with which to compare later readings.

For example, an increase in condenser approach tem- perature (condenser temperature minus leaving con- denser water temperature) may be an indication of dirty condenser tubes.

OPERATING INSPECTIONS – See Section 2

By following a regular inspection using the display read- ings of the MicroComputer Control Center, and main- tenance procedure, the operator will avoid serious op- erating difficulty. The following list of inspections and procedures should be used as a guide.

Daily

1.Check MicroComputer Control Center displays.

2.If the compressor is in operation, check the bear- ing oil pressure by pressing OIL PRESSURE key to read the display on the Control Center. Also check the oil level in the oil reservoir. Operating oil level should be between the upper and lower sight glasses. Drain or add oil if necessary.

3.Check entering and leaving condenser water pres- sure and temperatures for comparison with job de- sign conditions. Condenser water temperatures can be checked by pressing CONDENSER LIQUID TEMPERATURES display key.

4.Check the entering and leaving chilled liquid tem- peratures and evaporator pressure for comparison with job design conditions.This can be accomplished by pressing the CHILLED LIQUID TEMPS key and the REFRIGERANT PRESSURES key.

5.Check the condenser saturation temperature (based upon condenser pressure sensed by the condenser transducer). Press the DISPLAY DATA key. This key may be depressed repeatedly after depressing the DISPLAY HOLD key to display three different parameters.

6.Check the compressor discharge temperature. Press DATA DISPLAY key. During normal opera- tion discharge temperature should not exceed 220°F.

7.Check the compressor motor voltage and current (amps) at E-M starter (or Variable Speed Drive), or on the Control Center display for Solid State Starter units.

8.Check for any signs of dirty or fouled condenser tubes. (The temperature difference between water leaving condenser and liquid refrigerant leaving the condenser should not exceed the difference re- corded for a new unit by more than 4°F.)

9.Press the STATUS key whenever the display indi- cates so. This allows any warning messages to be displayed.

Weekly

1.Check the refrigerant charge. (See “Checking The Refrigerant Charge”, page 52.)

Quarterly

1. Perform chemical analysis of oil.

Semi-Annually (or more often as required)

1.Change and inspect compressor oil filter element.

2.Oil return system.

a.Change dehydrator.

b.Check nozzle of eductor for foreign particles.

3.Check controls and safety cutouts.

Annually (more often if necessary)

1.Drain and replace the oil in the compressor oil sump. (See “Charging The Unit With Oil”, page 43.)

2.Cooler and Condenser.

a.Inspect and clean water strainers.

b.Inspect and clean tubes as required.

c.Inspect end sheets.

3.Compressor Drive Motor (See motor manufactur- ers maintenance and service instruction supplied with unit)

a.Clean air passages and windings per manufac- turers instructions.

b.Meg motor windings – See Fig. 23 for details.

c.Re-lubricate ball bearings.

34

YORK INTERNATIONAL

Page 33 Page 35
Image 34
Page 33 Page 35
Contents Centrifugal Liquid Chillers With Microcomputer Control CenterTable of Contents Nomenclature Description of System and Fundamentals of Operation SectionSystem Operation Description See Fig Detail a Compressor Prerotation Vanes Capacity ControlSection Microcomputer Control Center Microcomputer Control Center and KeypadIntroduction Condenser Refrigerant LevelOperation Control CenterDisplaying System Parameters To Display OIL Pressure To Display Chilled Liquid TemperaturesPsid = HOP LP Offset Pressure To Display Operating Hours and Starts Counter To Display Motor CurrentSystem Setpoints See Programming System Setpoints, Displaying System Setpoints To Display Undervoltage setpoints Microcomputer Control Center Press Access Code keyProgramming Programming System SetpointsElectro-Mechanical Starter, refer to Fig Solid State Starter, refer to FigKeypad Programming Pull Down Demand Setpoint SetpointKeypad Programming Daily Schedule Setpoint Keypad Programming Holiday Service Keys PRE-ROTATION Vanes KeysOther Service Keys Pulldn Level = XXX% Setp = XXX% Actual = XXX%Operating Modes Compressor Switch Display MessagesSystem RUN Auto Vanes System Shutdown Messages When Control Center is in Remote mode MON Xxxx AM Evap Trans or Probe Error Then Function Jumper PositionTherefore MON Xxxx AM High Line Voltage MON Xxxx AM High Speed Drain Temp OIL Heaters Checking the OIL Level in the OIL System Operating ProceduresSTART-UP Procedure ReservoirSTART-UP Chiller OperationCondenser Water Temperature Control Chiller Starting Sequence & Shutdown SequenceChecking Operation EcwtLchwt Operating LOG SheetWeekly Operating Inspections See SectionDaily QuarterlySafety Shutdowns Need for Maintenance or ServiceNormal and Safety System Shutdowns Cycling ShutdownsProlonged Shutdown START-UP After Prolonged ShutdownSystem Components Description System ComponentsCompressor Lubrication System See Fig GeneralCompressor Speed Increasing GearsSchematic Drawing YK Compressor Lubrication System Heat Exchangers OIL HeaterMotor Driveline Refrigerant Flow ControlSolid State Starter Optional Microcomputer Control Center See SectionVariable Speed Drive Optional OIL Return System Operational MaintenanceChanging the Dehydrator OIL Charging Procedure OIL ChargeTroubleshooting RiseLEP Operating Setpoints System After Service Symptom High Cooler Pressure Operating Analysis ChartSymptom Abnormally LOW Suction Pressure Symptom no OIL Pressure When System Start Button PushedSymptom Reduced OIL Pump Capacity Symptom OIL Pump Vibrates or is NoisySymptom OIL Pump Fails to Deliver OIL Pressure OIL Pressure display keyLeak Testing During Operation MaintenanceConducting R-22 Pressure Test Vacuum Testing System PressuresVacuum Dehydration OperationChecking the Refrigerant Charge During Unit Shutdown Refrigerant ChargingRefrigerant Charge Handling Refrigerant for Dismantling and Repairs Megging the MotorMotor Stator Temperature and Insulation Resistances Condensers and Coolers Testing for Cooler and Condenser Tube Leaks Compressor Electrical ControlsCompressor Motor Preventive MaintenancePressure Testing Cooler and CondenserElectrical Controls ALL Rights Reserved

YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4, YK M3 M3 G4 specifications

The York YK M3 M3 G4, YK M3 M3 G4 THRU YK S6 S4 J2, and YK LB LB G4 THRU YK SE SC J4 represent a sophisticated line of HVAC systems engineered for modern commercial applications. These models are celebrated for their innovative designs, energy efficiency, and advanced features, making them a preferred choice among facility managers and building owners.

One of the standout characteristics of the York YK series is its modular construction, which provides unparalleled flexibility in system configuration. This design allows for easy upgrades and expansions as building demands evolve. The YK M3 series, in particular, is equipped with advanced controls that enhance system performance while minimizing energy consumption. With features like variable speed drives and sophisticated control algorithms, these units optimize airflow and refrigerant use, significantly reducing operational costs.

Another notable aspect of the YK M3 M3 G4 is its robust refrigeration technology. Utilizing high-efficiency scroll compressors, these chillers deliver impressive cooling capacities while maintaining high energy efficiency ratings. Integrated with low GWP (Global Warming Potential) refrigerants, they meet modern environmental standards, ensuring compliance with regulations while promoting sustainability.

The YK LB LB G4 and YK SE SC J4 models further enhance York’s portfolio with their compact designs and lower installation footprints. These chillers are ideal for applications where space is at a premium. Additional features include advanced noise reduction technology, allowing for quieter operation compared to traditional HVAC systems, making them suitable for urban environments or buildings where noise control is a priority.

Furthermore, York's commitment to continuous innovation is evident in the incorporation of smart technology across its chiller series. Features such as connectivity options for monitoring and diagnostics through mobile apps or web interfaces empower users to maintain optimal system performance proactively. This connectivity aids in predictive maintenance, enabling timely interventions that extend equipment life and reliability.

Finally, all these high-efficiency chillers are backed by York's renowned service support network, ensuring that customers have access to expert assistance and maintenance services whenever needed. With their exceptional features, modern technologies, and commitment to sustainability, the York YK M3 M3 G4, YK M3 M3 G4 THRU YK S6 S4 J2, and YK LB LB G4 THRU YK SE SC J4 models stand out as leaders in the commercial HVAC market, setting new standards for performance and efficiency.
Top Page Image Contents