York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 MON Xxxx AM High Speed Drain Temp

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IMPORTANT!!!: Although this message is generally indicative of a defective proximity probe, it is possible that the compressor has been damaged. If the high speed thrust bearing is not inspected by a qualified service technician prior to starting the chiller, further severe compressor damage could result. The chiller cannot be restarted until the “Special Reset Proce- dure” in YORK Service manual, Form 160.49-M3 is per- formed by a qualified service technician.

MON XX:XX AM – HIGH SPEED DRAIN TEMP

The chiller has shut down because the “Proximity/Tem- perature Sensor” has detected the temperature of the high speed drain line has reached 250.0°F or greater.

IMPORTANT: If the chiller has shut down displaying this message, it cannot be restarted until a qualified service technician performs visual inspection of the high speed thrust bearing and performs a special reset procedure. This special reset procedure is detailed in YORK Service manual, Form 160.49-M3. Failure to perform the visual inspection prior to restarting the chiller could result in severe compressor damage!!!

MON XX:XX AM – OPEN DRAIN TEMP THERMOCOUPLE

The chiller is shut down because the “Proximity/Tem- perature Sensor” thermocouple or high speed drain tem- perature wiring between the “Proximity/Temperature Sensor” module and the MicroComputer Control Cen- ter has been disconnected or has a poor electrical con- nection.

IMPORTANT: Open thermocouple shutdowns would typically indicate hardware or wiring defects and should not result in any damage to the compressor high speed thrust bearing. Therefore, a bearing inspection is not required. However, due to the critical nature of these circuits, anytime this shutdown occurs, a special re- set procedure must be performed by a qualified ser- vice technician before the chiller can be restarted. This procedure is detailed in Service manual, Form 160.49-M3.

MON XX:XX AM – DC UNDERVOLTAGE

The “Proximity/Temperature Sensor” module becomes unstable in operation when the +24VDC supply de- creases to +17VDC. Therefore, the Micro Board moni- tors the +24VDC supply and when it decreases to +19VDC, it shuts down the chiller and displays this message, preventing invalid “Proximity Sensor Safety” or “High Speed Drain Temp” safety shutdowns. The chiller will automatically restart when the voltage in- creases to greater than +19.7 VDC.

FORM 160.49-O2

MICRO BOARD

U16 RTC

IC CHIP

REAL

TIME

CLOCK

24673A

FIG. 14 – MICROCOMPUTER CONTROL CENTER LOCATION OF REAL TIME CLOCK U16 RTC IC CHIP

MON XX:XX AM – AUX SAFETY SHUTDOWN

The system is shut down because an external device, connected to digital input board TB1-31 (Auxiliary Safety Shutdown Input), has initiated a system shutdown. This input is a general purpose input that can be used to annunciate a user-defined safety shutdown. To restart chiller, press COMPRESSOR switch to STOP-RESETposition and then to START position.

REPLACE RTC. U16 – REPROGRAM SETPOINTS

Indicates that the battery located inside the REAL- TIME CLOCK IC chip (U16 on the Micro Board) is defective. This battery provides back-up power to the RTC memory (RAM) in the event of a utility AC power failure. This assures the system setpoints will be main- tained. If this message appears, the RTC IC chip (U16) on the Micro Board must be replaced. If there had been a power failure while this message is displayed, the setpoints will have been lost and must be repro- grammed. Order a replacement RTC IC chip (YORK part number 031-00955-000) from the YORK Parts Dis- tribution Center. With AC power removed from system, locate RTC chip U16 on the Micro Board and remove existing RTC chip from socket and discard. Observe anti-static precautions and install new RTC chip in socket. Assure proper IC orientation – orientation notch must be UP. (Refer to Fig. 14.)

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 Press Access Code keyMicrocomputer Control Center Programming System SetpointsSolid 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 START-UP Procedure System Operating ProceduresOIL Heaters Checking the OIL Level in the OIL ReservoirChiller Operation START-UPChiller Starting Sequence & Shutdown Sequence Condenser Water Temperature ControlLchwt EcwtChecking Operation Operating LOG SheetDaily Operating Inspections See SectionWeekly QuarterlyNormal and Safety System Shutdowns Need for Maintenance or ServiceSafety Shutdowns Cycling ShutdownsSTART-UP After Prolonged Shutdown Prolonged ShutdownSystem Components System Components DescriptionCompressor GeneralCompressor Lubrication System See Fig Speed Increasing GearsSchematic Drawing YK Compressor Lubrication System Motor Driveline OIL HeaterHeat Exchangers Refrigerant Flow ControlVariable 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 Abnormally LOW Suction Pressure Operating Analysis ChartSymptom High Cooler Pressure Symptom no OIL Pressure When System Start Button PushedSymptom OIL Pump Fails to Deliver OIL Pressure Symptom OIL Pump Vibrates or is NoisySymptom Reduced OIL Pump Capacity OIL Pressure display keyConducting 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 CompressorPressure Testing Preventive MaintenanceCompressor Motor 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.
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