Johnson Controls YEWS100 - User Manual

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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

A
Amanda PattonAug 15, 2025
Why is my Johnson Controls YEWS100 Chiller experiencing high discharge pressure?
- S
  Sierra WrightAug 15, 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).
K
Kevin ClarkAug 22, 2025
What causes Johnson Controls YEWS100 Chiller to have high discharge temperature?
- C
  Christopher WilliamsonAug 22, 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.
J
Jamie LeeAug 26, 2025
What to do if Johnson Controls YEWS100 Chiller motor over current?
- R
  Richard MurilloAug 26, 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.
D
Donna WatersAug 28, 2025
Why does Johnson Controls Chiller show oil level switch trip?
- M
  Mitchell WilliamsAug 28, 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.
R
Randall ChaseSep 1, 2025
What causes insufficient oil supply pressure in Johnson Controls Chiller?
- F
  Frank LynchSep 1, 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.
W
williamoconnorSep 4, 2025
What causes low chilled water temperature in Johnson Controls YEWS100 Chiller?
- J
  Jacqueline WhitakerSep 4, 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.
G
Gina HowellSep 7, 2025
What to do if the difference of discharge pressure and oil pressure is too high in Johnson Controls YEWS100 Chiller?
- E
  Erika YoungSep 8, 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.
D
Dillon MedinaSep 12, 2025
How to fix low discharge superheat in Johnson Controls YEWS100?
- R
  Reginald FrenchSep 12, 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.
A
antonioflynnNov 17, 2025
What to do if Johnson Controls YEWS100 shows low suction pressure?
- S
  scotthallNov 17, 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...

Johnson Controls YEWS100 Specifications

General

Brand	Johnson Controls
Model	YEWS100
Category	Chiller
Language	English

Summary

General Safety and Unit Information

Safety Guidelines and Warnings

Identifies hazards, safety symbols, and operational precautions.

Installation and Setup Procedures

Transportation, Handling, and Storage

Installation Requirements and Isolators

Covers general installation, location, and vibration isolator mounting.

Piping, Water Treatment, and Electrical Connections

Control System Operation and Parameters

Control Center Safety and Initialization

Safety, installation, and initialization procedures for the control center.

HMI Interface and Parameter Settings

Fault Inquiry and Reset Procedures

Modbus Protocol and Remote Monitoring

Commissioning, Operation, and Maintenance

Commissioning Process and First Start-Up

Covers preparation, checks, and the first-time startup procedure.

Normal Operation and System Checks

Scheduled Maintenance and Troubleshooting

Outlines maintenance schedules, leak testing, evacuation, and common troubleshooting steps.

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