York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 operation manual Introduction

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FORM 160.49-O2

INTRODUCTION

The YORK MicroComputer Control Center is a micro- processor based control system for R-22 or R134a cen- trifugal chillers. It controls the leaving chilled water tem- perature via pre-rotation vane control and has the ability to limit motor current via control of the pre-rotation vanes. Further, it is compatible with YORK Solid State Starter (optional), Variable Speed Drive (optional), and electro- mechanical starter applications.

A keypad mounted on the front of the Control Center (see Fig. 3) allows the operator to display system oper- ating parameters on a 40 character alphanumeric dis- play that is part of the keypad. These readings are dis- played via “Display” keypad as follows: (In the English mode; temperatures in °F, pressures in (PSIG) (in the metric mode, temperatures in °C, Pressures in KPa).

If unit is equipped with EPROM version C.02F(T).12 or later, the Control Center can be equipped with an op- tional Chinese language display, either as a field retrofit or factory supplied option on new units. This display mounts on the control center door, directly above the standard display. Both the standard and Chinese dis- play will be present, providing display messages simul- taneously in both English and Chinese language.

The Control Center must be configured for Chinese dis- play by a qualified service technician. Instructions are contained in YORK service manual, Form 160.49-M3.

•CHILLED LIQUID TEMPERATURES – LEAVING AND RETURN

•REFRIGERANT PRESSURES – EVAPORATOR AND CONDENSER

•DIFFERENTIAL OIL PRESSURE

•CONDENSER LIQUID TEMPERATURES – OPTIONAL FIELD INSTALLED – LEAVING AND RETURN

•OPTIONS

•PRINT *

•HISTORY PRINT *

•MOTOR CURRENT IN % OF FULL LOAD AMPS

•SATURATION TEMPERATURES – EVAPORATOR AND CONDENSER

•DISCHARGE TEMPERATURE

•OIL TEMPERATURE

•HIGH & LOW OIL PRESSURE TRANSDUCER PRES- SURE

•SOLID STATE STARTER MOTOR CURRENT / VOLTS (When Supplied)

•CONDENSER REFRIGERANT LEVEL

*These keys provide a print-out when the customer connects a com- patible printer to the Micro Board RS-232 serial port. (See Form 160.49-N7.)

The system setpoints (see Fig. 3) are operator entered on the front control center Setpoints keypad. These setpoints can also be displayed on the 40 character al- phanumeric display. The system setpoints are:

•CHILLED LIQUID TEMPERATURE (LCWT)

•% CURRENT LIMIT

•PULLDOWN DEMAND LIMIT

•CLOCK (TIME-OF-DAY)

•DAILY SCHEDULE (7 DAY TIME-CLOCK PROGRAM- MING)

•HOLIDAY

•REMOTE RESET TEMPERATURE RANGE

•DATA LOGGER

•CONDENSER REFRIGERANT LEVEL

The cause of all system shutdowns (safety or cycling) is preserved (until the system is reset or restarts) in the microcomputer’s memory for subsequent viewing on the keypad display. The operator is continually advised of system operating conditions by various background and warning messages. The keypad contains special ser- vice keys for use by the service technician when per- forming system troubleshooting.

The MicroComputer Control Center is designed to be compatible with most Energy Management Systems (EMS) in use today. The standard design allows for the following EMS interface:

1.Remote Start

2.Remote Stop

3.Remote LCWT Setpoint (Pulse Width Modulated sig- nal)

4.Remote Current Limit Setpoint (Pulse Width Modulated signal)

5.A “Remote Mode Ready to Start” Status Contacts

6.Safety Shutdown Status Contacts

7.Cycling Shutdown Status Contacts

As an enhancement to the standard EMS features, an optional card file with plug-in printed circuit boards is available. These optional cards will accept a remote LCWT 0 to 10°F or 0 to 20°F setpoint offset and/or re- mote current limit setpoint interface from three user in- put choices.

1.4-20mA

2.0-10VDC

3.Contact Closures

YORK INTERNATIONAL

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Contents With Microcomputer Control Center Centrifugal Liquid ChillersTable of Contents Nomenclature Description of System and Fundamentals of Operation SectionSystem Operation Description See Fig Capacity Control Detail a Compressor Prerotation VanesMicrocomputer Control Center and Keypad Section Microcomputer Control CenterCondenser Refrigerant Level IntroductionOperation 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 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 Then Function Jumper PositionTherefore 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 ExchangersSolid State Starter Optional Microcomputer Control Center See SectionVariable Speed Drive Optional OIL Return System Operational MaintenanceChanging the Dehydrator 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 CapacityLeak Testing During Operation MaintenanceConducting R-22 Pressure Test System Pressures Vacuum TestingOperation Vacuum DehydrationChecking the Refrigerant Charge During Unit Shutdown Refrigerant ChargingRefrigerant Charge 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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