York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 Ecwt, Lchwt, Checking Operation

Page 33

be no lower than the value determined by referring to the formula below:

 

15 x % LOAD

)

Min. ECWT = LCHWT—C RANGE + 5 + (

100

where:

 

 

 

ECWT

= entering condensing water temperature

LCHWT

= leaving chilled water temperature

 

C RANGE = condensing water temperature range

 

At start-up, the entering condenser water temperature may be as much as 25°F colder than the standby re- turn chilled water temperature. Cooling tower fan cycling will normally provide adequate control of the entering condenser water temperature on most instal- lations.

CHECKING OPERATION

During operation, the following conditions should be periodically checked:

1.On starting, the prerotation vanes should remain closed until the compressor motor is up to speed on the run winding; then the vane motor should cause the vanes to modulate with load requirements.

FORM 160.49-O2

2.Be sure the oil pump is operating while unit is run- ning.

3.Check Oil Pressure display. A gradual decrease in bearing oil pressure of 5 to 10 psi (with constant suction and discharge pressures) may be an indi- cation of a dirty filter. The filter should be replaced when pressure loss is 30% or more of the original pressure. The actual bearing oil pressure will vary with compressor suction and discharge pressures. When a new system is first operated under normal full load conditions, the bearing oil pressure should be recorded as a reference point with which to com- pare subsequent readings.

OPERATING LOG SHEET

A permanent daily record of system operating condi- tions (temperatures and pressures) recorded at regu- lar intervals throughout each 24 hour operating period should be kept.

An optional status printer is available for this purpose or Fig. 16 shows a log sheet used by YORK Personnel for recording test data on chiller systems. It is avail- able from the factory in pads of 50 sheets each under Form 160.44-F6 and may be obtained through the nearest

23889A

LD00467

*NOTE: These items can be printed by an electronic printer connected to TB8 of the Micro Board and pressing the PRINT key on the Micro Board or automatically using the Data Logger feature.

FIG. 16 – LIQUID CHILLER LOG SHEETS

YORK INTERNATIONAL

33

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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 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 Function Jumper Position ThenTherefore 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 ControlMicrocomputer 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 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 keyMaintenance 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 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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