Johnson Controls YEWS Series User Manual

Johnson Controls YEWS Series

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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.

Johnson Controls YEWS Series Specifications

General

Brand	Johnson Controls
Model	YEWS Series
Category	Chiller
Language	English

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.

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