York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 To Display OIL Pressure

Page 9

 

 

 

DISPLAY

 

 

 

READS

CONDENSER PRESS. = < 6.8 PSIG,

or > 300 PSIG

XX.X PSIG

EVAPORATOR PRESS. = < 50 PSIG,

or > 125 PSIG

XX.X PSIG

EVAP. PRESS. (BRINE)

= < 25 PSIG,

or > 100 PSIG

XX.X PSIG

HOP TRANSDUCER

= < 59.1 PSIG, or > 314.9 PSIG

XX.X PSIG

LOP TRANSDUCER

= < 23.2 PSIG, or > 271.8 PSIG

XX.X PSIG

DISCHARGE TEMP.

= < 20.3°F;

> 226.4°F

XXX.X°F

OIL TEMP.

= < 20.3°F;

> 226.4°F

XXX.X°F

LEAVING CONDENSER

=

< 8.4°F;

> 134.1°F

XXX.X°F

WATER TEMP.

 

 

 

 

ENTERING CONDENSER

=

< 8.4°F;

> 134.1°F

XXX.X°F

WATER TEMP.

 

 

 

 

 

 

 

 

LEAVING EVAPORATOR

= < 0°F

 

XX.X°F

WATER TEMP.

= > 81.1°F

 

XX.X°F

 

 

 

 

ENTERING EVAPORATOR

= < .1°F

 

XX.X°F

WATER TEMP.

= > 93°F

 

XX.X°F

 

 

 

 

 

FIG. 4 – SYSTEM PARAMETERS – OUT OF RANGE READINGS

To Display CHILLED LIQUID TEMPERATURES:

Press CHILLED LIQUID TEMPS display key as de- scribed on page 7 to produce the following alphanu- meric display message:

CHILLED LEAVING = XXX.X°F, RETURN = XXX.X°F

To Display REFRIGERANT PRESSURE:

Use REFRIGERANT PRESSURE display key as described on page 7 to produce the following alpha- numeric display message:

EVAP = XXX.X PSIG; COND = XXX.X PSIG

To Display OIL PRESSURE:

Use OIL PRESSURE display key as described on page 7 to produce the following alphanumeric dis- play message:

OIL PRESSURE = XXXX.X PSID

The differential pressure displayed is the pressure dif- ference between the high side oil pressure transducer (output of oil filter) and the low side oil pressure trans- ducer (compressor housing). Displayed value includes offset pressure derived from auto-zeroing during “START SEQUENCE INITIATED”. If either transducer is out-of-range, XX.X is displayed. Oil pressure is calculated as follows:

FORM 160.49-O2

______ PSID = (HOP – LP) – OFFSET PRESSURE

OFFSET PRESSURE: Pressure differential between the HOP transducer and LOP transducer outputs dur- ing a 3 second period beginning 10 seconds after the start of “START SEQUENCE INITIATED”. During this time, the transducers will be sensing the same pres- sure and their outputs should indicate the same pres- sure. However, due to accuracy tolerances in trans- ducer design, differences can exist. Therefore, to com- pensate for differences between transducers and as- sure differential pressure sensing accuracy, the OFF- SET PRESSURE is subtracted algebraically from the differential pressure. The offset pressure calculation will not be performed if either transducer is out-of-range. The offset value will be taken as 0 PSI in this instance.

To Display OPTIONS:

This key is not used.

NO OPTIONS INSTALLED

is displayed when this key is pressed.

To Display SSS MOTOR CURRENT / VOLTS:

(Solid State Starter Applications Only)

If chiller is equipped with a YORK Solid State Starter, use SSS MOTOR CURRENT / VOLTS key to dis- play 3-phase compressor motor current and 3-phase Solid State Starter input line voltage.

Continuously pressing this key will display the mo- tor current and line voltage alternately. When used with the DISPLAY HOLD key, motor current and line voltage will alternately be displayed each time this key is pressed. The messages are as follows:

A AMPS = XXXX; B AMPS = XXXX; C AMPS = XXXX

V A-B = XXXX; V B-C = XXXX; V C-A = XXXX

If chiller is not equipped with a Solid State Starter, this key produces the following message:

SOLID STATE STARTER NOT INSTALLED

In PROGRAM mode, this key is used to display the applicable line voltage range (200-208VAC, 220- 240VAC, 380VAC, 400VAC, 415VAC, 440-480VAC, 500-600VAC, Supply Voltage Range Disabled).The correct line voltage range is programmed at the YORK factory and is checked by the service tech- nician at start-up. For security reasons, a special access code is required to program the line volt- age range. The line voltage range is used to deter- mine a low line voltage threshold for cycling shut- down. Refer to “System Setpoints” for Trip/Reset values.

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 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.

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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.