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Johnson Controls YEWS Series - User Manual

Johnson Controls YEWS Series
88 pages
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Supersedes:
EN
AP1105
-IOM01(0316)
YEWS Water Cooled Screw Chiller
(Water Source Heat Pump)
Installation, Operation and
Maintenance
Form No:AP1105-IOM01(1216) EN
YEWS High Efficiency Chiller With Single Compressor
STYLE E
Warning
The System is charged with refrigerant with a certain pressure
Improper operation during maintenance may cause serious damage to the system. All
maintenance shall be done by York authorized technician, following the guide in York
installation, operation and maintenance manual.

Table of Contents

Questions and Answers

  • J
    Jared MartinezAug 14, 2025
    Why is my Johnson Controls YEWS Chiller experiencing high discharge pressure?
    • D
      David BrownAug 14, 2025
      High discharge pressure in your Johnson Controls Chiller can occur due to several reasons. The cooling water temperature might be too high, requiring you to reduce the condenser water inlet temperature by checking the cooling tower and water circulation. The condenser tubes could be dirty or scaled, so cleaning them and checking water conditioning is recommended. Insufficient condenser water flow could also be the cause; increase the quantity of water through the condenser to the proper value. Other potential issues include a faulty compressor discharge valve (check the valve), a faulty discharge pressure sensor (replace the sensor), or air in the condenser (purge the unit).
  • J
    James TaylorAug 21, 2025
    What causes Johnson Controls YEWS Chiller to have high discharge temperature?
    • J
      Jamie TurnerAug 21, 2025
      High discharge temperature in your Johnson Controls Chiller can be attributed to a few key factors. The cooling water temperature may be too high; in this case, reduce the condenser water inlet temperature by checking the cooling tower and water circulation. Another cause could be dirty or scaled condenser tubes, which would need to be cleaned. Finally, insufficient load for system capacity may be the issue, so increase the compressor minimum operation current set.
  • A
    alison33Aug 25, 2025
    What to do if Johnson Controls YEWS motor over current?
    • T
      Tracy ArmstrongAug 25, 2025
      If your Johnson Controls Chiller's motor is experiencing over current, it could be due to the compressor load increasing too rapidly. Try adjusting the compressor loading time setting. Alternatively, the “CUR.OFFSET” value might be incorrect; adjust the current offset to the proper value.
  • L
    Lauren WatersAug 27, 2025
    Why does Johnson Controls YEWS show oil level switch trip?
    • M
      Miguel ColemanAug 27, 2025
      An oil level switch trip in your Johnson Controls Chiller can occur for several reasons. The system might be overcharged with refrigerant; recover refrigerant to achieve the correct discharge superheat and subcooling. A faulty oil level switch could be the culprit, requiring replacement. Similarly, a faulty oil heater should be replaced. If the oil filter (outside the compressor) is clogged, clean it. The compressor not starting from minimum load can also cause this issue; check the compressor slide valve and slide valve solenoid valve, and set the compressor unloading time to the proper value. Finally, insufficient load for system capacity may be the cause, so increase the compressor minimum operation current set.
  • P
    prussellAug 31, 2025
    What causes insufficient oil supply pressure in Johnson Controls YEWS Chiller?
    • L
      Lindsey RodriguezAug 31, 2025
      Insufficient oil supply pressure in your Johnson Controls Chiller can be caused by a cooling water temperature that is too low; increase the condenser water temperature. Alternatively, a faulty oil pressure or evaporation pressure sensor could be the issue, so change the pressure sensor.
  • A
    Amanda ParksSep 3, 2025
    What causes low chilled water temperature in Johnson Controls Chiller?
    • F
      fjonesSep 3, 2025
      Low chilled water temperature in your Johnson Controls Chiller can occur if the slide valve fails to unload; check the compressor slide valve and slide valve solenoid valve, and set the compressor unloading time to the correct value. Also, the “LOW LELT” value might be incorrect; adjust the water temperature set value.
  • R
    Rachael VasquezSep 6, 2025
    What to do if the difference of discharge pressure and oil pressure is too high in Johnson Controls YEWS?
    • H
      hartmichelleSep 6, 2025
      If the difference between discharge pressure and oil pressure is too high in your Johnson Controls Chiller, it could be due to a clogged oil filter (inside the compressor); change the oil filter. Another potential cause is a faulty discharge pressure or oil pressure sensor, so change the pressure sensor.
  • J
    jack07Sep 9, 2025
    How to fix low discharge superheat in Johnson Controls YEWS Chiller?
    • D
      Dr. Kelly Williams MDSep 9, 2025
      Low discharge superheat in your Johnson Controls Chiller can be caused by a few things. It could be that the system is overcharged with refrigerant, in which case you should adjust the charge. Another cause might be refrigerant saturated with oil; perform oil recovery and check oil levels. Finally, the system might be overcharged with oil, so adjust the oil charge.
  • H
    hammondjonathanNov 16, 2025
    What to do if Johnson Controls YEWS shows low suction pressure?
    • J
      Jessica CarrilloNov 16, 2025
      Low suction pressure in your Johnson Controls Chiller can stem from several issues. It could be due to a faulty pressure sensor, which would require you to change the pressure sensor. A faulty chilled water temperature sensor could also be the problem, so replace it. Check for dirty or scaled evaporator tubes and clean them, ensuring proper water conditioning. Insufficient evaporator water flow can also cause this; increase the water flow through the evaporator to the correct level. Additionally, verify that the “LOW LELT” or "LEP SHUN DOWN" settings are correct and reset them if needed. Other potential causes include the compressor not starting from minimum load or a slide valve malfunction, both requiring inspection of the compressor slide valve and slide valve solenoid valve. A slide va...

Summary

Installation, Operation, and Maintenance

Warning

Alerts about potential hazards and improper operation.

General Safety Guidelines

READ BEFORE PROCEEDING!

Emphasizes critical safety guidelines and precautions.

Product Description

Functional Description

Installation

Electrical Connection

Control Center

General Parameters Setting and Default Values

Modbus Protocol

Commissioning

First Time Start-Up

Guides through the initial startup procedure for the unit.

Troubleshooting

System Trouble Shooting Analysis

Provides analysis of common system problems and their causes.

Johnson Controls YEWS Series Specifications

General IconGeneral
BrandJohnson Controls
ModelYEWS Series
CategoryChiller
LanguageEnglish

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