York YK M3 M3 G4 THRU YK S6 S4 J2, YK LB LB G4 THRU YK SE SC J4 Operating Analysis Chart

Page 47

FORM 160.49-O2

TABLE 2 – OPERATING ANALYSIS CHART

RESULTS

POSSIBLE CAUSE

REMEDY

 

 

 

1. SYMPTOM: ABNORMALLY HIGH DISCHARGE PRESSURE

 

 

 

 

Temperature difference between liquid

Air in condenser.

 

refrigerant out and water off condenser

 

 

higher than normal.

 

 

 

 

 

High discharge pressure.

Condenser tubes dirty or .

Clean condenser tubes. Check water

 

scaled

conditioning.

 

 

 

 

High condenser water

Reduce condenser water inlet

 

temperature.

temperature. (Check cooling tower

 

 

and water circulation.)

 

 

 

Temperature difference between conden-

Insufficient condensing

Increase the quantity of water through

ser water on and water off higher than

water flow.

the condenser to proper value.

normal, with normal cooler pressure.

 

 

 

 

 

2. SYMPTOM: ABNORMALLY LOW SUCTION PRESSURE

 

 

 

 

Temperature difference between leaving

Insufficient charge of

Check for leaks and charge

chilled water and refrigerant in cooler

refrigerant.

refrigerant into system.

greater than normal with high discharge

 

 

Flow orifice blocked.

Remove obstruction.

temperature.

 

 

 

 

 

Temperature difference between leaving

Cooler tubes dirty or

Clean cooler tubes.

chilled water and refrigerant in the cooler

restricted.

 

greater than normal with normal discharge

 

 

temperature.

 

 

 

 

 

Temperature of chilled water too low with

Insufficient load for

Check prerotation vane motor opera-

with low motor amperes.

system capacity.

tion and setting of low water temper-

 

 

ature cutout.

 

 

 

3. SYMPTOM: HIGH COOLER PRESSURE

 

 

 

 

High chilled water temperature.

Prerotation vanes fail to

Check the prerotation vane motor

 

open.

positioning circuit.

 

 

 

 

System overload.

Be sure the vanes are wide open

 

 

(without overloading the motor) until

 

 

the load decreases.

 

 

 

4. SYMPTOM: NO OIL PRESSURE WHEN SYSTEM START BUTTON PUSHED

Low oil pressure displayed on control center; compressor will not start.

Oil pump running in wrong

Check rotation of oil pump

direction.

(Electrical Connections).

 

 

Oil pump not running.

Check electrical connections to oil

 

pump and press manual reset on oil

 

pump starter mounted on condenser

 

shell.

 

 

5.SYMPTOM: COMPRESSOR STARTS, NORMAL OIL PRESSURE DEVELOPS, FLUCTUATES FOR SHORT WHILE, THEN COMPRESSOR STOPS ON OIL PRESSURE CUTOUT

Oil pressure normal, fluctuates then compressor stops on Oil Pressure Cutout. Display reading

LOW OIL PRESSURE .

Unusual starting conditions

Drain the oil from the compressor and

exist, i.e., oil foaming in

charge new oil into the compressor.

resevoir and piping due to

(Refer to “Charging The System With

lowered system pressure.

Oil”, page 39.)

 

 

Burned out oil heater.

Replace oil heater.

 

 

YORK INTERNATIONAL

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Image 47
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.

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