York YCAS0180 User Manual

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INSTALLATION, OPERATION & MAINTENANCE

AIR-COOLED SCREW LIQUID CHILLERS

Supersedes: 201.18-NM1 (1298)

Form 201.18-NM1 (102)

YCAS AIR-COOLED SCREW LIQUID CHILLERS

YCAS0130 through YCAS0230

YCAS 2 SYSTEM EPROM 031-01798-001 (STANDARD, BRINE & METRIC MODELS COMBINED)

28971AR

Table of Contents

Questions and Answers:

J
James KellerAug 5, 2025
How to troubleshoot a York Chiller with no display on the panel and that won't start?
- S
  Stacy PerryAug 6, 2025
  If there is no display on the control panel and the York Chiller won't start, here's what you can check: * Ensure the main power supply to the control system is switched on. * Verify that the emergency stop switch on the control panel and any remote emergency stop devices are in the ON position. * Inspect the mains supply in case of an undervoltage relay trip. * Check the emergency stop switch fuses, wiring from - T2 to powerboard and fuse if there's no supply to - T2 or no 24VAC supply to the powerboard. * If there's no +12V output from the powerboard, consider replacing the powerboard or reducing excessive load on the board.
I
ihansonAug 10, 2025
What to do if my York YCAS0180 Chiller displays a HIGH AMBIENT TEMP fault?
- D
  Daniel BradleyAug 10, 2025
  If your York Chiller displays a 'HIGH AMBIENT TEMP' fault, it means the ambient air temperature is exceeding the programmed operating limit. Use the 'ambient temp.' key to check the temperature reading. If the reading is accurate, the message should disappear once the ambient temperature drops below the limit. Also, verify that the programmed settings are correct for the unit's options. Check that the fan is operating correctly and the rotation is correct. Check for airflow recirculation. Finally, check the sensor calibration, location, and wiring to ensure accurate temperature measurement.
K
Kelly NicholsonAug 14, 2025
How do I fix a HIGH OIL TEMP error on my York YCAS0180?
- M
  Mary ReedAug 14, 2025
  If the York Chiller displays a 'HIGH OIL TEMP' message, it could be due to poor airflow through the condenser coils. Check for any obstructions blocking the intake faces of the air coils. Also, verify the accuracy of the temperature reading by checking the sensor calibration, location, and wiring.
K
Kyle GeorgeAug 18, 2025
Why does my York Chiller display 'NO RUN PERM'?
- A
  Angela EscobarAug 18, 2025
  If the York Chiller displays 'NO RUN PERM', it indicates a 'No run permissive' status. This can happen if there's no liquid flow through the cooler. Ensure that liquid pumps are running, valves are correctly set, and flow is established. Also, check that the flow switch is functional and correctly installed per the manufacturer's instructions, as the pump starter might be wired to and controlled by the unit on some systems.
M
Mark LucasAug 23, 2025
What causes a LOW WATER TEMP fault on a York Chiller?
- O
  ofriedmanAug 23, 2025
  If the York Chiller displays a 'LOW WATER TEMP' fault, it could be due to several reasons. The leaving liquid temperature might be dropping below the programmed low limit faster than the unit can unload. Check for any restrictions in the liquid flow line and ensure stable liquid flow. Also, verify the unit is unloading correctly by checking the supply to the unloader valve solenoid and confirming the compressor unloads correctly. Finally, ensure the temperature readings are accurate by checking the sensor calibration, location, and wiring.
J
Jeff HoldenAug 27, 2025
What does LOW AMBIENT TEMP mean on my York YCAS0180?
- N
  nashdavidAug 27, 2025
  If your York Chiller displays a 'LOW AMBIENT TEMP' fault, it means the ambient air temperature is below the programmed operating limit. Use the 'ambient temp.' key to display the temperature and confirm its accuracy. The warning should clear once the ambient temperature rises above the limit. Also, ensure the programmed settings are correct for the unit's options, and check the sensor calibration, location, and wiring.
J
John HodgesAug 31, 2025
What causes VAC UNDERVOLTAGE fault on a York YCAS0180?
- E
  Erin HudsonAug 31, 2025
  If the York Chiller displays 'VAC UNDERVOLTAGE', it indicates a problem with the mains supply voltage. Check that the mains supply is stable and within allowable limits. Also, check for any voltage dips when the compressor starts.

York YCAS0180 Specifications

General

Brand	York
Model	YCAS0180
Category	Chiller
Language	English

Summary

General Chiller Information and Safety

YORK Chiller Warranty Terms

Outlines YORK's warranty terms and conditions for equipment and materials.

Chiller Safety Standards and Compliance

Details standards and codes followed for chiller safety and design.

Operator Responsibilities for Safety

Defines the responsibilities of operators and personnel working with machinery.

Preventing Equipment Misuse and Damage

Warns against improper use and operation outside design parameters.

Electrical Safety Precautions

Stresses grounding and safe practices for electrical work.

Emergency Shutdown Procedures

Explains the function of the emergency stop switch and other breakers.

Product Description

Compressor Specifications and Operation

Microprocessor Control System Functions

Motor Protection Features

Explains how the microprocessor protects the motor from over/under current.

Motor Protection Module Details

Details the Texas Instruments 2ACE module and its diagnostic codes.

Motor Starting Methods

Unit Nomenclature and Nameplate Data

Handling and Storage Procedures

Pre-Installation Unit Inspection

Safe Chiller Moving and Lifting

Details safe methods for lifting and moving the unit.

Chiller Installation Guidelines

Site Location Requirements

Emphasizes site selection based on performance and service access.

Required Location Clearances

Details necessary clearances to ensure airflow and prevent recirculation.

Vibration Isolator Installation

Pipework Connection Requirements

Water Treatment Recommendations

Electrical Connection Procedures

Outlines general recommendations for electrical wiring.

Commissioning the Chiller

Pre-Commissioning Checks

Lists checks to perform before applying power to the unit.

Refrigerant Charge and Leak Testing

Explains how to check and charge refrigerant, and leak testing.

Compressor Oil Level Check

Details checking and maintaining compressor oil levels.

First Time Start-up Procedure

Details the procedure for starting the unit and monitoring for issues.

Checking Subcooling and Superheat

Guides on checking subcooling and superheat for system adjustment.

Economizer Superheat Check

Leak Checking After Initial Operation

Chiller Operation

Chiller Start-up Procedure

Guides on checking power, valves, and initiating the start sequence.

Normal Running and Cycling

Chiller Shutdown Procedures

Electrical Data and Wiring

Multiple Point Power Supply Connection

Optional Single-Point Power Supply Connections

Wiring Diagrams Overview

Chiller Maintenance Procedures

General Maintenance Requirements

Daily Maintenance Checks

Outlines daily checks for operators, emphasizing unit serviceability.

Scheduled Maintenance Intervals

Details minor and major service intervals and recommendations.

Maintenance Requirements by Frequency

General Periodic Maintenance Checks

Troubleshooting Guide

Troubleshooting Unit Start Issues

Lists causes and actions for no display or unit start problems.

Troubleshooting 'NO RUN PERM' Message

Addresses issues related to no liquid flow or open contacts.

Troubleshooting System Faults

Covers common faults like high oil temp, ambient temp, and voltage issues.

Troubleshooting Discharge Pressure Issues

Troubleshoots high discharge pressure trips and related causes.

Troubleshooting Suction and Oil Issues

Addresses low suction pressure and oil differential pressure problems.

Troubleshooting Motor Current Issues

Addresses low compressor current and current limiting issues.

Sensor Calibration Charts

Limited Warranty Applied Systems

Warranty Terms for New Equipment

Conditions That Void Warranties

Lists conditions that will void all warranties.

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