York YK M3 M3 G4 operation manual Operating Setpoints System After Service

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YORK INTERNATIONAL

TABLE 1 – CAUSES OF NORMAL AND SAFETY SYSTEM SHUTDOWNS IN ACCORDANCE WITH THE MICROCOMPUTER CONTROL, CENTER DISPLAY

 

SHUTDOWN CAUSE

 

GOVERNING CONTROL FUNCTION

 

 

 

 

CONTROL CENTER DISPLAY

 

 

 

 

 

 

 

 

 

 

PROGRAMMED

START-UP OF

PROBABLE CAUSE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OPERATING

 

 

 

 

 

 

 

 

SETPOINTS

SYSTEM AFTER

AND SERVICE

DAY OF

TIME OF

CAUSE OF

 

METHOD OF

 

POINT

 

 

DESCRIPTION

 

BY OPERATOR

SHUTDOWN

REQUIRED

WEEK

DAY

SHUTDOWN

 

RESTART

ON

 

ON

 

 

 

 

 

 

 

 

 

 

 

 

RISE

 

FALL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MON.

10:00 AM

Oil Pressure

 

 

High Oil Press.

100 PSID (Dur-

 

59

 

Will start at 59

This Shutdown is provided

 

 

Transducer

 

 

Transducer

ing first 7 min. of

 

PSID

 

PSID when compr.

to check on Oil Pressure

 

 

Error

 

 

 

Compr. Oper.)

 

 

 

switch is placed to

Transducers for failure in

 

 

 

 

 

 

60 PSID (After

 

 

 

STOP/RESET and

the high state. Replace

 

 

 

 

 

 

first 7 min. of

 

 

 

then START

Oil Press.Transducer in

 

 

 

 

 

 

Compr. Oper.)

 

 

 

 

oil sump or compressor

 

 

Vane Motor

 

Autostart

Vane Motor

 

 

 

 

Restart automatically

Vanes are set improperly,

 

 

Switch Open

 

 

Switch

 

 

 

 

after Vane Motor arm

reset vane linkage check

 

 

 

 

 

 

 

 

 

 

linkage is set pro-

vane positions using

 

 

 

 

 

 

 

 

 

 

perly. Press STOP/

the SERVICE key switch

 

 

 

 

 

 

 

 

 

 

RESET and then

and proper keys on the

 

 

 

 

 

 

 

 

 

 

START switch

MicroComputer Control

 

 

 

 

 

 

 

 

 

 

 

Center

MON.

10:00 AM

Starter

 

 

Motor Current >

 

 

 

 

Press compressor

Check motor starter

 

 

Malfunction

 

 

15% for 10 swc.

 

 

 

 

STOP/RESET

operation. Motor current

 

 

Detected

 

 

with Control Cen-

 

 

 

 

switch and then

value greater than 15%

 

 

 

 

 

ter not calling for

 

 

 

 

 

FLA

 

 

 

 

 

motor to run

 

 

 

 

 

 

MON.

10:00 AM

Program

 

Autostart

Micro Board

 

 

 

 

 

Watchdog timer circuit

 

 

Initiated

 

 

 

 

 

 

 

 

has reset software pro-

 

 

Reset

 

 

 

 

 

 

 

 

gram – Chiller will

 

 

 

 

 

 

 

 

 

 

 

automatically restart.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace RTC

 

 

RTC-IC chip

 

 

 

 

Reprogram the Con-

Weak battery

 

 

IC chip

 

 

 

 

 

 

 

trol Center Setponts

Replace RTC-IC chip

 

 

Reprogram

 

 

 

 

 

 

 

& proceed with

U16

 

 

Setpoints

 

 

 

 

 

 

 

Normal Start-up

 

MON.

10:00 AM

Low Oil

 

Autostart

Oil Temp.

71.0°F

 

55°F

 

Press STOP/

Oil Temp.Thermistor

 

 

Temperature

 

 

Thermistor

 

 

 

 

RESET switch &

disconnected from

 

 

 

 

 

(RT3)

 

 

 

 

then START

Analog Input Board.

 

 

 

 

 

 

 

 

 

 

switch

Reconnect or replace

 

 

 

 

 

 

 

 

 

 

 

open sensor.

 

 

 

 

 

 

 

 

 

 

 

 

MON.

10:00 AM

Faulty Dis-

 

 

Discharge Temp.

30.0°F

 

29.9°F

 

Press STOP/

Faulty Discharge Temp.

 

 

charge Temp.

 

 

Thermistor

 

 

 

 

START switch &

Thermistor (RT2) or dis-

 

 

Sensor

 

 

(RT2) discon-

 

 

 

 

then START

connected from Analog

 

 

 

 

 

nected or faulty

 

 

 

 

switch

Input Board. Connect or

 

 

 

 

 

operating temp.

 

 

 

 

 

replace open sensor.

 

 

 

 

 

= 32°F

 

 

 

 

 

 

MON.

100.00 AM

Low Line

 

 

SSS Logic

See legend on wiring

 

Chiller will automa-

Low AC Line Voltage

 

 

Voltage (SSS

 

 

Board

diagram

 

 

tically restart when

 

 

 

Units only)

 

 

 

 

 

 

 

all phases of line vol-

 

 

 

 

 

 

 

 

 

 

 

tage increase to the

 

 

 

 

 

 

 

 

 

 

 

minimum required

 

 

 

 

 

 

 

 

 

 

 

starting level.

 

 

 

 

 

 

 

 

 

 

 

 

 

MON.

10:00 AM

MTR Phase

 

 

SSS Logic

See “Section 2”

 

 

Press STOP/START

Motor Phase Current

 

 

Current

 

 

Board

 

 

 

 

switch then START

Unbalance

 

 

unbalance

 

 

 

 

 

 

 

switch

 

 

 

(SSS Units

 

 

 

 

 

 

 

 

 

 

 

only)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Image 46
Contents Centrifugal Liquid Chillers With Microcomputer Control CenterTable of Contents Nomenclature Description of System and Fundamentals of Operation SectionSystem Operation Description See Fig Detail a Compressor Prerotation Vanes Capacity ControlSection Microcomputer Control Center Microcomputer Control Center and KeypadIntroduction Condenser Refrigerant LevelOperation Control CenterDisplaying System Parameters To Display OIL Pressure To Display Chilled Liquid TemperaturesPsid = HOP LP Offset Pressure To Display Operating Hours and Starts Counter To Display Motor CurrentSystem Setpoints See Programming System Setpoints, Displaying System Setpoints To Display Undervoltage setpoints Microcomputer Control Center Press Access Code keyProgramming Programming System SetpointsElectro-Mechanical Starter, refer to Fig Solid State Starter, refer to FigKeypad Programming Pull Down Demand Setpoint SetpointKeypad Programming Daily Schedule Setpoint Keypad Programming Holiday Service Keys PRE-ROTATION Vanes KeysOther Service Keys Pulldn Level = XXX% Setp = XXX% Actual = XXX%Operating Modes Compressor Switch Display MessagesSystem RUN Auto Vanes System Shutdown Messages When Control Center is in Remote mode MON Xxxx AM Evap Trans or Probe Error Then Function Jumper PositionTherefore MON Xxxx AM High Line Voltage MON Xxxx AM High Speed Drain Temp OIL Heaters Checking the OIL Level in the OIL System Operating ProceduresSTART-UP Procedure ReservoirSTART-UP Chiller OperationCondenser Water Temperature Control Chiller Starting Sequence & Shutdown SequenceChecking Operation EcwtLchwt Operating LOG SheetWeekly Operating Inspections See SectionDaily QuarterlySafety Shutdowns Need for Maintenance or ServiceNormal and Safety System Shutdowns Cycling ShutdownsProlonged Shutdown START-UP After Prolonged ShutdownSystem Components Description System ComponentsCompressor Lubrication System See Fig GeneralCompressor Speed Increasing GearsSchematic Drawing YK Compressor Lubrication System Heat Exchangers OIL HeaterMotor Driveline Refrigerant Flow ControlSolid State Starter Optional Microcomputer Control Center See SectionVariable Speed Drive Optional OIL Return System Operational MaintenanceChanging the Dehydrator OIL Charging Procedure OIL ChargeTroubleshooting RiseLEP Operating Setpoints System After Service Symptom High Cooler Pressure Operating Analysis ChartSymptom Abnormally LOW Suction Pressure Symptom no OIL Pressure When System Start Button PushedSymptom Reduced OIL Pump Capacity Symptom OIL Pump Vibrates or is NoisySymptom OIL Pump Fails to Deliver OIL Pressure OIL Pressure display keyLeak Testing During Operation MaintenanceConducting R-22 Pressure Test Vacuum Testing System PressuresVacuum Dehydration OperationChecking the Refrigerant Charge During Unit Shutdown Refrigerant ChargingRefrigerant Charge Handling Refrigerant for Dismantling and Repairs Megging the MotorMotor Stator Temperature and Insulation Resistances Condensers and Coolers Testing for Cooler and Condenser Tube Leaks Compressor Electrical ControlsCompressor Motor Preventive MaintenancePressure Testing 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.

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