York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 Function Jumper Position, Then

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chiller, press COMPRESSOR switch to STOP/RESET position and then to START position.

VANE MOTOR SWITCH OPEN

The chiller is shut down because a system-start se- quence has been initiated, but the pre-rotation vanes are not fully closed.

MON XX:XX AM – STARTER MALFUNCTION DETECTED

The chiller is shut down because the Control Center has detected a motor-current value greater than 15% FLA for 10 seconds minimum anytime when the com- pressor-start signal is not energized. To restart the chiller, press COMPRESSOR switch to STOP/RESET position and then to the START position.

MON XX:XX AM – PROGRAM INITIATED RESET

The chiller is shut down because Micro Board did not receive a hardware-generated interrupt on schedule. Typical is an Analog/Digital Converter interrupt. This message is indicative of a Micro Board hardware fail- ure or electrical noise on Micro Board. The chiller will automatically restart. This message indicates that the watchdog timer-circuit has reset the microprocessor. This occurs when the time needed to step through pro- gram is longer than allowable, thus the software pro- gram is initialized at its beginning.

SYSTEM READY TO START – PRESS STATUS

The chiller was shut down on a safety shutdown and will start upon application of a local or remote start signal. Since the message states that the chiller is “Ready to Start”, it means that the shutdown no longer exists and the Control Center has been manually re- set. When the STATUS key is pressed, a message is displayed that describes the reason for shutdown. The message will be displayed for 2 seconds and then re- turn to SYSTEM READY TO START – PRESS STATUS .

Those messages that could be displayed are any of the previously described safety-shutdown messages or warning messages. They can be cleared from the display by entering Service mode and pressing WARN- ING RESET key. Or, the message will be cleared by initiating a compressor start.

START SEQUENCE INITIATED

Indicates that the Micro Board has received a local or remote start signal and has initiated the chiller start- up routine.

This is the compressor pre-lube period. The duration of this period is controlled by the “Prerun” (JP6) wire

FORM 160.49-O2

jumper on the Micro Board as follows:

FUNCTION

JUMPER POSITION

50 Sec. Oil Pump Prerun

Installed

180 Sec. Oil Pump Prerun

Cut

SYSTEM COASTDOWN

Displayed while motor is decelerating after a chiller shutdown. The oil pump is running during this period. The duration of this period is 150 seconds.

If unit is configured for a Steam Turbine application (program jumper JP4 removed), this period is extended to allow for a longer coastdown time. EPROM version C.02F(T).11 provides a 6 minute coastdown period. EPROM version C.02F(T).12 or later provides a 10 minute coastdown period.

MON XX:XX AM – MTR PHASE CURRENT UNBALANCE

(Solid State Starter applications only)

The chiller is shut down because the compressor-motor current was unbalanced while the chiller was running. The current balance is only checked after the motor has been running for a minimum of 45 seconds and the motor current is 80% FLA or greater. If the current in

any phase deviates from the average (a + b + c ) current

3

by greater than 30% for a minimum of 45 consecutive seconds, a shutdown is initiated. To restart the sys- tem, press the COMPRESSOR switch to STOP/RE- SET position and then to the START position. An ex- ample of the conditions for shutdown is as follows:

IF:

I∅A = 200A

I∅B = 200A

I∅C = 118A

THEN:

IAV = 200 + 200 + 118 3

IAV = 173A

IACCEPTABLE = 173 ± 30% = 121A or 225A

THEREFORE:

Since I∅C = 118A which is less than the accept- able 121A, the chiller would shut down if this unbalance exists for 45 consecutive seconds.

MON XX:XX AM – LOW LINE VOLTAGE

(Solid State Starter applications only)

Chiller is shut down because the voltage in any phase of line voltage has decreased below the under-volt- age-shutdown threshold for 20 consecutive seconds,

YORK INTERNATIONAL

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Contents With Microcomputer Control Center Centrifugal Liquid ChillersTable of Contents Nomenclature Section Description of System and Fundamentals of OperationSystem Operation Description See Fig Capacity Control Detail a Compressor Prerotation VanesMicrocomputer Control Center and Keypad Section Microcomputer Control CenterCondenser Refrigerant Level IntroductionControl Center OperationDisplaying System Parameters To Display Chilled Liquid Temperatures To Display OIL PressurePsid = HOP LP Offset Pressure To Display Motor Current To Display Operating Hours and Starts CounterSystem 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 Function Jumper Position ThenTherefore 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 ExchangersMicrocomputer Control Center See Section Solid State Starter OptionalVariable Speed Drive Optional Operational Maintenance OIL Return SystemChanging 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 CapacityMaintenance Leak Testing During OperationConducting R-22 Pressure Test System Pressures Vacuum TestingOperation Vacuum DehydrationRefrigerant Charging Checking the Refrigerant Charge During Unit ShutdownRefrigerant 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.

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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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