York YCAS Series User Manual

York YCAS Series

216 pages

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INSTALLATION, OPERATION & MAIN TE NANCE

AIR-COOLED SCREW LIQUID CHILLERS

New Release

Form 201.19-NM8 (804)

YCAS AIR-COOLED LIQUID CHILLERS

YCAS0685EB THROUGH YCAS0965EB (3 COMPRESSOR)

YCAS1065EB THROUGH YCAS1215EB (4 COMPRESSOR)

STYLE G R407C

50 Hz

I/O BOARD #2 EPROM

031-01798-001

MICROPROCESSOR BOARD

031-01788-002

(YCAS 3 SYSTEM EPROMs)

(YCAS 4 SYSTEM EPROMs)

I/O BOARD #2 EPROM

031-01798-001

MICROPROCESSOR BOARD

031-01788-002

035-20886-000

00258VIP

Table of Contents

Other manuals for York YCAS Series

Wiring Diagram32 pages

Questions and Answers:

N
nicholspamelaJul 25, 2025
How to troubleshoot a York YCAS with no display on the panel and that won't start?
- C
  craignathanJul 25, 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.
R
Renee HarrisonJul 29, 2025
What to do if my York YCAS displays a HIGH AMBIENT TEMP fault?
- A
  Andrew StevensJul 29, 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.
T
toddtaylorAug 3, 2025
How do I fix a HIGH OIL TEMP error on my York Chiller?
- D
  Destiny HernandezAug 3, 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.
J
Jerry DuncanAug 6, 2025
Why does my York Chiller display 'NO RUN PERM'?
- D
  Douglas WilliamsAug 7, 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.
H
harmonanthonyAug 11, 2025
What causes a LOW WATER TEMP fault on a York YCAS Chiller?
- C
  Carol GardnerAug 11, 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.
M
Mark PhamAug 16, 2025
What does LOW AMBIENT TEMP mean on my York YCAS Chiller?
- D
  Dennis SmithAug 16, 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.
C
Crystal PhillipsAug 20, 2025
What causes VAC UNDERVOLTAGE fault on a York YCAS Chiller?
- E
  Eric RodriguezAug 20, 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 YCAS Series Specifications

General

Brand	York
Model	YCAS Series
Category	Chiller
Language	English

Summary

SECTION 1 - GENERAL CHILLER INFORMATION & SAFETY

WARRANTY

SAFETY

RESPONSIBILITY FOR SAFETY

EMERGENCY SHUTDOWN

Location and function of emergency stop switches for safe operation.

SECTION 4 - INSTALLATION

PIPEWORK CONNECTION

ELECTRICAL CONNECTION

SECTION 5 - COMMISSIONING

FIRST TIME START-UP

Step-by-step procedure for the initial startup of the chiller unit.

SECTION 6 - OPERATION

START-UP

Checks before starting the unit and the startup sequence.

NORMAL RUNNING AND CYCLING

ELECTRICAL DATA

MULTIPLE POINT POWER SUPPLY CONNECTION

OPTIONAL SINGLE POINT POWER SUPPLY CONNECTION AND INDIVIDUAL SYSTEM CIRCUIT BREAKERS

ELECTRICAL NOTES

ELEMENTARY WIRING DIAGRAM

YCAS0685 - YCAS0965 (3 COMPRESSOR)

Wiring diagram for Wye Delta Start 3 Compressor.

SECTION 8 - MICRO PANEL CONTENTS

PROGRAMMING AND DATA ACCESS KEYS

1.9 MOTOR PROTECTOR MODULES

2. STATUS KEY: GENERAL STATUS MESSAGES & FAULT WARNINGS

2.2 GENERAL STATUS MESSAGES

2.3 UNIT WARNINGS

Conditions requiring operator intervention or indicating extreme operating conditions.

Low Battery Warning

Warning indicating low battery impacting clock and settings.

2.5 UNIT FAULT STATUS MESSAGES

System faults that cause chiller shutdown and automatic restart conditions.

High Discharge Pressure Cutout

Safety function to prevent system pressure from exceeding safe limits.

Low Suction Pressure Cutout

Safety feature to protect the evaporator from ice buildup.

SECTION 9 - MAINTENANCE

GENERAL REQUIREMENTS

Daily/Weekly Maintenance

Scheduled Maintenance

Details on minor and major service schedules for the unit.

SECTION 11 - TROUBLESHOOTING GUIDE

No display on panel - unit will not start

Troubleshooting steps for issues related to no display or unit not starting.

SYS # HIGH DSCH displayed (High discharge pressure trip)

Troubleshooting steps for high discharge pressure trips.

SYS # LOW CURR/MP/HP displayed

Troubleshooting for low current, motor protector, or high pressure issues.

LIMITED WARRANTY YORK AMERICAS ENGINEERED SYSTEMS

WARRANTY ON NEW EQUIPMENT

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