York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 Need for Maintenance or Service

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4.Inspect and service electrical components as nec- essary.

5.Perform chemical analysis of system.

NEED FOR MAINTENANCE OR SERVICE

If the system is malfunctioning in any manner or the unit is stopped by one of the safety controls, consult the “Operation Analysis Chart”, pages 47 through 48 of this instruction. After consulting this chart, if you are unable to make the proper repairs or adjustments to start the compressor or the particular trouble con- tinues to hinder the performance of the unit, please call the nearest YORK District Office. Failure to report constant troubles could damage the unit and increase the cost of repairs considerably.

NORMAL AND SAFETY SYSTEM SHUTDOWNS

Normal and safety system shutdowns have been built into the chiller to protect it from damage during certain operating conditions.Therefore, it should be understood that at certain pressures and temperatures the sys- tem will be stopped automatically by controls that re- spond to high temperatures, low temperatures, and low and high pressures, etc. Table 1 is an explanation of each specific shutdown. If the chiller shuts down on a “Safety” shutdown, the display will read

SYSTEM SHUTDOWN – PRESS STATUS

Upon pressing the STATUS key, the day-of-week, time- of-day and cause of shutdown is displayed. Safety shut- downs require the operator to manually reset the Con- trol Center prior to restarting the chiller. When the dis- play reads START SEQUENCE INITIATED , the cause of the safety shutdown is automatically cleared from the memory.

SAFETY SHUTDOWNS

•Power Failure (If auto restart programming jumper is not installed on the Micro Board)

•Low Evaporator Pressure

•Low Oil Pressure

•High Condenser Pressure

•Evaporator Transducer or Probe Error

•High Discharge Temp

•High Oil Temp

•Oil Pressure Transducer

•Starter Malfunction Detected

•Faulty Discharge Temp Sensor

•Aux. Safety Shutdown

FORM 160.49-O2

•Motor Phase Current Unbalance (Solid State Starter Unit only)

•Proximity sensor

•Faulty Prox. Probe

•Open Drain Thermocouple

If the chiller shuts down on a “Cycling” shutdown the display will read SYSTEM SHUTDOWN – PRESS STATUS .

Upon pressing the STATUS key, the day-of-week, time- of-day and cause of shutdown are displayed. These shutdowns do not require the operator to manually re- set the Control Center prior to re-starting the chiller. The chiller will automatically restart when the cycling condition is removed.

CYCLING SHUTDOWNS

•Power Failure (If auto re-start programming jumper is installed on the Micro Board)

•Low Water Temp

•Flow Switch

•System Cycling

•Multi-Unit Cycling

•Internal Clock

•Anti-Recycle

•Motor Controller (Manual reset of the CM-2 module on E-M starter units; the logic board of the Solid State Starter may be required)

•Power Fault

•Program Initiated Reset

•Low Oil Temp

•AC Undervoltage

•DC Undervoltage

•Low Line Voltage (Solid State Starter units only)

•High Line Voltage (Solid State Starter units only)

•Low Oil Temp. Differential

STOPPING THE SYSTEM (See Fig. 3, page 6)

The MicroComputer Control Center can be programmed to start and stop automatically (maximum, once each day) whenever desired. Refer to “Section 2”. To stop the chiller, proceed as follows:

1.Push the COMPRESSOR STOP/RESET switch.The Control Center display will show

SYSTEM COASTDOWN for 150 seconds. If unit is configured for a STEAM TURBINE application (pro- gram jumper JP4 removed), this period is extended to allow for a longer coastdown time. EPROM ver- sion C.02F(T).11 provides a 6 minute coastdown

YORK INTERNATIONAL

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Contents With Microcomputer Control Center Centrifugal Liquid ChillersTable of Contents Nomenclature System Operation Description See Fig SectionDescription of System and Fundamentals of Operation Capacity Control Detail a Compressor Prerotation VanesMicrocomputer Control Center and Keypad Section Microcomputer Control CenterCondenser Refrigerant Level IntroductionDisplaying System Parameters Control CenterOperation Psid = HOP LP Offset Pressure To Display Chilled Liquid TemperaturesTo Display OIL Pressure System Setpoints To Display Motor CurrentTo Display Operating Hours and Starts Counter See Programming System Setpoints, Displaying System Setpoints To Display Undervoltage setpoints Programming System Setpoints Press Access Code keyProgramming Microcomputer Control CenterSolid State Starter, refer to Fig Electro-Mechanical Starter, refer to FigSetpoint Keypad Programming Pull Down Demand SetpointKeypad Programming Daily Schedule Setpoint Keypad Programming Holiday PRE-ROTATION Vanes Keys Service KeysPulldn Level = XXX% Setp = XXX% Actual = XXX% Other Service KeysOperating Modes Display Messages Compressor SwitchSystem RUN Auto Vanes System Shutdown Messages When Control Center is in Remote mode MON Xxxx AM Evap Trans or Probe Error Therefore Function Jumper PositionThen MON Xxxx AM High Line Voltage MON Xxxx AM High Speed Drain Temp Reservoir System Operating ProceduresSTART-UP Procedure OIL Heaters Checking the OIL Level in the OILChiller Operation START-UPChiller Starting Sequence & Shutdown Sequence Condenser Water Temperature ControlOperating LOG Sheet EcwtLchwt Checking OperationQuarterly Operating Inspections See SectionDaily WeeklyCycling Shutdowns Need for Maintenance or ServiceNormal and Safety System Shutdowns Safety ShutdownsSTART-UP After Prolonged Shutdown Prolonged ShutdownSystem Components System Components DescriptionSpeed Increasing Gears GeneralCompressor Compressor Lubrication System See FigSchematic Drawing YK Compressor Lubrication System Refrigerant Flow Control OIL HeaterMotor Driveline Heat ExchangersVariable Speed Drive Optional Microcomputer Control Center See SectionSolid State Starter Optional Changing the Dehydrator Operational MaintenanceOIL Return System OIL Charge OIL Charging ProcedureRise TroubleshootingLEP Operating Setpoints System After Service Symptom no OIL Pressure When System Start Button Pushed Operating Analysis ChartSymptom Abnormally LOW Suction Pressure Symptom High Cooler PressureOIL Pressure display key Symptom OIL Pump Vibrates or is NoisySymptom OIL Pump Fails to Deliver OIL Pressure Symptom Reduced OIL Pump CapacityConducting R-22 Pressure Test MaintenanceLeak Testing During Operation System Pressures Vacuum TestingOperation Vacuum DehydrationRefrigerant Charge Refrigerant ChargingChecking the Refrigerant Charge During Unit Shutdown Megging the Motor Handling Refrigerant for Dismantling and RepairsMotor Stator Temperature and Insulation Resistances Condensers and Coolers Testing for Cooler and Condenser Tube Leaks Electrical Controls CompressorCooler and Condenser Preventive MaintenancePressure Testing Compressor MotorElectrical 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.
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