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York R-134a - User Manual

York R-134a
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MODEL YK (STYLE H)
R-134a and R-513A
WITH OPTIVIEW
TM
CONTROL CENTER
FOR ELECTRO-MECHANICAL STARTER,
SOLID STATE STARTER AND VARIABLE SPEED DRIVE
CENTRIFUGAL LIQUID CHILLERS
OPERATIONS AND MAINTENANCE Supersedes: 160.76-O1 (1018) Form 160.76-O1 (519)
LD15222
Issue Date:
May 22, 2019
035-27332-100

Table of Contents

Other manuals for York R-134a

Preview: Installation Instructions
Installation Instructions28 pages

Questions and Answers

  • C
    cherylsalinasAug 15, 2025
    What to do if my York R-134a Chiller has abnormally low suction pressure?
    • H
      Heather MitchellAug 16, 2025
      If your York Chiller is experiencing abnormally low suction pressure, several factors could be responsible. You may have insufficient refrigerant, so check for leaks and add refrigerant to the system. There might be a variable orifice problem, requiring the removal of any obstruction. Dirty or restricted evaporator tubes can also cause this issue, so clean them. Finally, it could be due to insufficient load for the system capacity; in this case, check the pre-rotation vane motor operation and the setting of the low water temperature cutout.
  • F
    fmcdonaldAug 19, 2025
    How to fix abnormally high discharge pressure in my York Chiller?
    • C
      cchanAug 19, 2025
      Abnormally high discharge pressure in your York Chiller can occur due to several reasons. The condenser tubes might be dirty or scaled, requiring cleaning and a check of the water conditioning. Another cause could be high condenser water temperature, suggesting a need to reduce the condenser water inlet temperature, and you should also check the cooling tower and water circulation. Finally, insufficient condensing water flow could be the culprit, in which case you should increase the quantity of water through the condenser to the proper value.
  • G
    Gina WolfAug 21, 2025
    Why does my York R-134a Chiller have high evaporator pressure?
    • J
      juan32Aug 21, 2025
      High evaporator pressure in your York Chiller can be attributed to a couple of reasons. One potential cause is the failure of the pre-rotation vanes to open, which necessitates checking the pre-rotation vane motor positioning circuit. Another reason might be system overload. Ensure the vanes are wide open (without overloading the motor) until the load decreases.
  • S
    Steven SmithAug 25, 2025
    What to do if the oil pump in my York Chiller vibrates or is noisy?
    • M
      Ms. Rebecca YoungAug 26, 2025
      If the oil pump in your York Chiller is vibrating or noisy, it could be due to a couple of reasons. First, the oil may not be reaching the pump suction inlet in sufficient quantity, so check the oil level. Second, the oil pump may be worn or failed, requiring repair or replacement.
  • B
    Blake KingAug 27, 2025
    What should I do if there's no oil pressure when the start button is pushed on my York R-134a?
    • J
      Jimmy JohnsonAug 27, 2025
      If there's no oil pressure when you push the start button on your York Chiller, it could be because the oil pump is running in the wrong direction; check the rotation of the oil pump. Alternatively, the oil pump might not be running at all, so troubleshoot the electrical problem with the oil pump VSD.
  • J
    joshuathompsonAug 30, 2025
    How to resolve reduced oil pump capacity in my York Chiller?
    • R
      Rose MartinezAug 30, 2025
      If your York Chiller has reduced oil pump capacity, it could be caused by excessive end clearance in the pump or other worn pump parts; inspect and replace any worn parts. Another possible cause is a partially blocked oil supply inlet, so check the oil inlet for any blockage.
  • A
    Andrew NelsonSep 2, 2025
    Why does my York Chiller oil pressure gradually decrease?
    • J
      Jose PowellSep 3, 2025
      If you notice that the oil pressure in your York Chiller is gradually decreasing, it is likely because the oil filter is dirty. You should change the oil filter.
  • J
    jacksonevanSep 5, 2025
    What causes unusually high oil pressure in my York Chiller?
    • L
      Larry HartmanSep 6, 2025
      If unusually high oil pressure develops when the oil pump runs in your York Chiller, it may be because the oil pressure transducer is defective. Consider replacing the low or high oil pressure transducer.
  • C
    Charles LopezSep 8, 2025
    What to do if York Chiller oil pressure system stops returning an oil/refrigerant sample?
    • K
      Karen MartinSep 9, 2025
      If the oil pressure system in your York Chiller stops returning an oil/refrigerant sample, the filter-drier in the oil return system might be dirty, so replace the old filter-drier with a new one. Also, the jet or orifice of the oil return jet could be clogged; remove the jet, inspect it for dirt, remove the dirt using solvent, and then replace it.
  • M
    Matthew ElliottSep 12, 2025
    What causes the oil pump to fail to deliver oil pressure in my York R-134a?
    • A
      Adam ConleySep 12, 2025
      If the oil pump fails to deliver oil pressure in your York Chiller, it could be due to a faulty oil pressure transducer or faulty wiring/connectors. Try replacing the oil pressure transducer.

Summary

General Safety Guidelines

Safety Symbols Explanation

Explains the meaning of safety symbols like danger, caution, warning, and note used throughout the document.

Document Overview and Nomenclature

Changeability and Associated Literature

Informs about document updates and lists related literature for further reference.

Nomenclature Explained

Details the model identification system for YORK Centrifugal Liquid Chillers.

System Description and Operation

System Operation Fundamentals

Describes the core working principles and components of the YORK Model YK Chiller.

Capacity Control Mechanisms

Explains how the chiller adjusts its cooling capacity using pre-rotation vanes.

System Operating Procedures

Oil Heaters and Level Checks

Covers oil heater function, operation, and checking the oil reservoir level.

Chiller Start-Up and Operation

Details the start-up sequence, chiller operation, and condenser water temperature control.

Operating Inspections

Lists daily, weekly, and monthly inspections for system monitoring.

System Shutdown and Storage

Provides procedures for stopping the system and preparing for long-term shutdown.

System Components Description

General Components and Compressor

Describes the overall chiller package, compressor, capacity control, and lubrication system.

Auxiliary Components and Controls

Details oil heaters, motor driveline, heat exchangers, OptiView, starters, and bypass systems.

Operational Maintenance

Oil Return System and Dehydrator

Explains the oil return system and the procedure for changing the dehydrator.

Oil Charging and Management

Specifies oil capacities and the step-by-step process for charging oil into the reservoir.

Troubleshooting Guide

Operation Analysis Chart

A diagnostic tool to identify symptoms, causes, and remedies for chiller malfunctions.

Maintenance Tasks

Parts, Leak, and Pressure Testing

Guidance on ordering parts, performing leak tests, and conducting pressure tests on the system.

Vacuum Testing and Dehydration

Detailed procedures for vacuum testing, system dehydration, and refrigerant charging.

Refrigerant Handling and Motor Testing

Safe handling of refrigerant during repairs and testing motor insulation resistance.

Heat Exchanger Cleaning and Leak Detection

Methods for cleaning heat exchanger tubes and detecting tube leaks.

Compressor and Electrical Maintenance

Covers compressor maintenance tasks and inspection of electrical controls for malfunctions.

Preventive Maintenance

Compressor and Motor Checks

Details maintenance for compressor oil filters, oil changes, motor mounting, and windings.

Motor Greasing and Lubrication

Instructions for motor bearing re-lubrication, including schedules, procedures, and approved greases.

Motor Rotation and Calibration

Procedures for rotating idle motors, calibrating grease guns, and selecting appropriate greases.

Water System and WEG Motor Care

Maintenance for evaporator/condenser water sides and specific greasing for WEG motors.

Oil System and Electrical Control Checks

Maintenance for the oil return system and inspection of electrical controls.

York R-134a Specifications

General IconGeneral
BrandYork
ModelR-134a
CategoryChiller
LanguageEnglish

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