Johnson Controls YEWS170 - 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

M
Mark WaltonAug 15, 2025
Why is my Johnson Controls YEWS170 Chiller experiencing high discharge pressure?
- E
  emilyjonesAug 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).
J
John DanielsAug 21, 2025
What causes Johnson Controls YEWS170 Chiller to have high discharge temperature?
- A
  Ashley FrazierAug 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.
H
Harold ClarkAug 26, 2025
What to do if Johnson Controls Chiller motor over current?
- J
  Jose PierceAug 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.
E
Eric SmithAug 28, 2025
Why does Johnson Controls YEWS170 Chiller show oil level switch trip?
- T
  Travis BakerAug 29, 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.
S
Shannon PopeSep 1, 2025
What causes insufficient oil supply pressure in Johnson Controls Chiller?
- J
  James WhiteSep 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.
M
Michael RobertsSep 4, 2025
What causes low chilled water temperature in Johnson Controls Chiller?
- R
  Ryan JonesSep 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.
T
Tammy SuarezSep 7, 2025
What to do if the difference of discharge pressure and oil pressure is too high in Johnson Controls Chiller?
- J
  Jimmy ScottSep 7, 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.
M
Michael PerezSep 12, 2025
How to fix low discharge superheat in Johnson Controls YEWS170 Chiller?
- L
  Louis SanchezSep 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.
K
Karen BakerNov 17, 2025
What to do if Johnson Controls YEWS170 Chiller shows low suction pressure?
- J
  Joshua ShannonNov 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 YEWS170 Specifications

General

Brand	Johnson Controls
Model	YEWS170
Category	Chiller
Language	English

Summary

General Manufacturer Information

Safety and Responsibility

Details safety standards and user responsibility for safe operation.

Emergency Shutdown and Safety Labels

Procedures for emergency shutdown and explanation of safety labels.

Product Description

Compressor Details

Power and Control Panel Overview

Description of the control panel enclosure, sections, and components.

Transportation, Handling, and Storage

Rigging and Handling Procedures

Installation Requirements

General Description and Location

Piping Connections and Water Treatment

Electrical Connection and Condenser Water System

Instructions for electrical hookups and managing the condenser cooling water system.

Variable Primary Flow and Wiring

Control Center Operations

Safety Notices and Initialization

Safety warnings for controller operation and initial setup procedures.

HMI Operation and Display Interface

Parameter Settings and Fault Information

Default parameter values, setting instructions, and fault code explanations.

Modbus Protocol and Fault Details

Modbus communication protocol and detailed fault definitions.

Commissioning Procedures

Preparation and Power Checks

Pre-commissioning checks including power, inspection, and refrigerant status.

Valve Adjustments and Isolation

Water System and Brine Chiller Setup

First Time Start-Up Procedure

Detailed steps for the initial start-up and operation of the unit.

Unit Operation

General Operation and Start-Up

Overview of unit design, operation, and the start-up process.

Normal Running, Cycling, and Notes

Running Detection and Stop Procedures

Maintenance Procedures

General and Daily Maintenance

Routine maintenance tasks and general requirements for unit upkeep.

Refrigerant Charging and Leak Checks

Procedures for checking refrigerant levels and detecting leaks.

Compressor Oil Analysis and Change

Guidelines for compressor oil analysis, limits, and changing procedures.

Condenser;Evaporator Care and Leak Checking

Evacuation and Scheduled Maintenance

Procedures for vacuum dehydration and overview of scheduled maintenance.

Troubleshooting and Calibration

System Troubleshooting Analysis

Systematic approach to identifying and correcting operational problems and symptoms.

Sensor Calibration Charts

Technical Data and Specifications

Decommissioning, Dismantling, and Disposal

General Decommissioning Procedures

Flow Switch Installation Instructions

Flow Switch Application and Parameters

Flow Switch Installation and Wiring

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