York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 See Programming System Setpoints

Page 11

terms of minutes (to a maximum of 255). If not pro- grammed, the default value is 100% FLA for 00 min- utes. (See “Programming Systems Setpoints”, page 16.) Thus, no pull down demand limit is imposed following system start, and the % current limit setpoint is used.

CLOCK – This key displays the day of the week, time of day and calendar date. If not programmed, the default value is SUNDAY 12:00 AM 1/1/92 .

(See “Programming System Setpoints”, page 16.)

DAILY SCHEDULE – This key displays the programmed daily start and stop times, from Sunday thru Saturday plus Holiday. If desired, the Control Center can be pro- grammed to automatically start and stop the chiller as desired. This schedule will repeat on a 7-day calendar basis. If the Daily Schedule is not programmed, the de- fault value is 00:00 AM start and stop times for all days of the week and the holiday. (Note that the system will not automatically start and stop on a daily basis with these default values because 00:00 is an “Impossible” time for the Micro Board. See “Programming System Setpoints”, page 17.) Finally, one or more days in the week can be designated as a holiday (see description under HOLIDAY setpoint) and the Control Center can be programmed (usually Daily Schedule setpoint) to automatically start and stop the chiller on those days so designated. The operator can override the time clock at any time using the COMPRESSOR switch.

Note that if only a start time is entered for a particular day, the compressor will not automatically stop until a scheduled stop time is encountered on a subsequent day.

HOLIDAY – This key indicates which days in the upcom- ing week are holidays. On those designated days, the chiller will automatically start and stop via the holiday start and stop times programmed in the DAILY SCHED- ULE setpoint. It will do this one time only and the follow- ing week will revert to the normal daily schedule for that day.

REMOTE / RESET TEMP RANGE – This key displays the maximum offset of remote LCWT setpoint reset.This offset is either 10° or 20°F as programmed. When in the REMOTE mode, this value is added to the operator pro- grammed CHILLED LIQUID TEMP setpoint and the sum equals the temperature range in which the LCWT can be reset. For example, if the operator programmed CHILLED LIQUID TEMP setpoint is programmed with a value of 10°F, then the CHILLED LIQUID TEMP setpoint can be remotely reset over a range of 46°F to 56°F (46

+10 = 56). If not programmed, the default value for this parameter is 20°F.

FORM 160.49-O2

For additional information on remote LCWT reset, refer to Form 160.49-PW13.

NOTE: If an Energy Management System is interfaced to the Control Center for the purpose of remote LCWT setpoint reset, then the operator pro- grammed REMOTE RESET TEMP RANGE value determines the maximum value of tem- perature reset controlled by the Energy Man- agement System.

DATE LOGGER – This key is used when an optional printer is connected to the MicroComputer Control Cen- ter. Refer to Form 160.49-N7 for operation instructions.

SSSMOTOR CURRENT/VOLTS – This key is used on Solid State Starter applications only. Although this is a display key, it is used to program the applicable AC power line voltage range (380VAC, 400VAC, 415VAC, 440-480VAC,550-600VAC). The MicroComputer Con- trol Center uses this entry to determine the under-volt- age and overvoltage shutdown threshold. For each line voltage category, there is an undervoltage and ov- ervoltage shutdown threshold. If the AC power line volt- age exceeds these thresholds for 20 continuous sec- onds, the chiller shuts down and displays

MON 10:00 AM LOW LINE VOLTAGE

– or –

MON 10:00 AM HIGH LINE VOLTAGE

This overvoltage and undervoltage protection can be disabled. Refer to chart below:

LOW / HIGH LINE VOLTAGE TRIP / RESET VALUES

COMPRESSOR

LOW LINE VOLTAGE

HIGH LINE VOLTAGE

OPERATING POINT

OPERATING POINT

MOTOR

 

 

 

 

SUPPLY VOLTAGE

CUTOUT-(V)

CUTIN-(V)

CUTOUT-(V)

CUTIN-(V)

RANGE – (V)

(ON FALL)

(ON RISE)

(ON RISE)

(ON FALL)

 

 

 

 

 

 

380

305

331

415

414

400

320

349

436

435

415

335

362

454

453

440-480

370

400

524

523

 

 

 

 

 

550-600

460

502

655

654

Supply Voltage

NONE

0

NONE

0

Range Disabled

 

 

 

 

 

 

 

 

 

For security reasons, a special access code is required to program the supply voltage range.The supply voltage range is programmed at the factory and should only be changed by a service technician.

YORK INTERNATIONAL

11

Image 11
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.