Johnson Controls YORK YLAA0195HE - User Manual

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Installation, Comissioning, Operation

and Maintenance

YLAA0180SE-YLAA0485SE & YLAA0195HE-YLAA0516HE

Supercedes: 150.72-ICOM8.EN.CE (0912) Form 150.72-ICOM8.EN.CE (0713)

AIR COOLED LIQUID CHILLERS

WITH SCROLL COMPRESSORS

STYLE B

(Cooling Capacities: 187 kW to 520 kW)

R410A

035-23574-100

Table of Contents

Other manuals for Johnson Controls YORK YLAA0195HE

Operating Instructions56 pages

Questions and Answers

M
Matthew SellersAug 10, 2025
What to do if Johnson Controls YORK YLAA0195HE displays 'FLOW SWITCH OPEN'?
- A
  Andrew AndersonAug 10, 2025
  If the Johnson Controls Air Compressor displays 'FLOW SWITCH OPEN', it indicates there's no liquid flow through the cooler, the flow switch contacts aren't making proper contact, or the flow switch itself is defective. Ensure liquid pumps are running, valves are correctly set to allow flow, and the flow switch is functional and installed according to the manufacturer's instructions. On some systems, the pump starter may be wired to the unit and controlled to start by the unit. If necessary, replace the flow switch.
H
Heather ZamoraAug 15, 2025
What to do if Johnson Controls YORK YLAA0195HE displays 'UNIT FAULT: LOW LIQUID TEMP'?
- C
  Charles VelasquezAug 15, 2025
  If your Johnson Controls Air Compressor displays 'UNIT FAULT: LOW LIQUID TEMP', it could be due to an improperly adjusted leaving chilled liquid temperature cut-out (especially for glycol systems), incorrect control panel setpoint/range values, low chilled liquid flow, or a defective sensor. Try re-programming the leaving chilled liquid temperature cut-out and re-adjusting the setpoint/range. Increase the chilled liquid flow. Compare the sensor against a known good temperature sensing device, ensuring it's properly installed with heat conductive compound. Refer to sensor calibration tables if needed.
V
Victoria GonzalezAug 22, 2025
How to troubleshoot a Johnson Controls Air Compressor with no display on the panel?
- C
  christopher22Aug 22, 2025
  If the Johnson Controls Air Compressor panel has no display and the unit won't operate, the main supply to the unit might be off, the emergency stop device might be activated, there might be no supply to -T1, no 24 Vac supply to the microprocessor board, no 24 Vac output from Transformer -T1, a short circuit in the wiring to temperature sensors or pressure transducers, or a defective microprocessor or display board. Switch on the mains supply if it is safe. Ensure the remote emergency stop device is in the ‘ON’ position. Check the wiring to -T1 and fuse -F1, and the wiring from -T1 to the J14 microprocessor board. Try changing transformer -T1. Unplug connections at the microprocessor board to isolate the issue. Replace the board after contacting Johnson Controls Service.
Y
ydoyleAug 28, 2025
Why does my Johnson Controls Air Compressor display 'UNIT FAULT: LOW AMBIENT TEMP'?
- M
  michellehullAug 28, 2025
  If the Johnson Controls Air Compressor displays 'UNIT FAULT: LOW AMBIENT TEMP', it means the ambient air temperature is lower than the programmed operating limit, or the measured temperature is incorrect. Use the ‘OPER DATA’ key to display the temperature and confirm if the displayed value is approximately correct. The warning message should clear when the ambient air temperature reaches the programmed operating limit. Also, check the programmed settings are correct for the options fitted to the unit and verify the sensor calibration, location, and wiring.
M
Michael StewartSep 2, 2025
What causes 'UNIT FAULT: 115 VAC UNDERVOLTAGE' on a Johnson Controls YORK YLAA0195HE Air Compressor?
- I
  ichavezSep 2, 2025
  If the Johnson Controls Air Compressor displays 'UNIT FAULT: 115 VAC UNDERVOLTAGE', it indicates a poor mains supply voltage. Check that the mains supply is stable and within allowable limits. Also, check for any voltage dip when the compressor starts.

Johnson Controls YORK YLAA0195HE Specifications

General

Brand	Johnson Controls
Model	YORK YLAA0195HE
Category	Air Compressor
Language	English

Summary

Specification

Unit Overview and Compressors

General unit description and details on hermetic scroll compressors.

Refrigerant Circuits and Evaporator

Describes refrigerant piping and the Brazed Plate Heat Exchanger.

Microprocessor Controls and Setpoints

Details microprocessor control functions, programmable setpoints, and displayed data.

Installation

Location Requirements and Site Selection

Essential criteria for choosing an installation site for optimal performance.

Pipework Connection and Arrangement Guidance

Recommendations for pipework connections, arrangements, and systems.

Electrical Connection Recommendations and Warnings

Crucial advice for safe and proper electrical hook-up.

Power Supply and Control Wiring Details

Details on power supply, control circuit, emergency stop, and voltage-free contacts.

Commissioning

Preparation and Power Off Checks

Essential preparation steps before commissioning, ensuring power is off.

Soft Start Option Handling during Commissioning

Specific procedure for soft starters during commissioning.

Switch Settings, Heaters, and Water System Checks

Verifying unit settings, crankcase heaters, and chilled liquid system.

Sensor, HP Cut-out, and Control Panel Checks

Checks for temperature sensors, HP cut-outs, and control panel illumination.

Programmed Settings and Compressor Operation Verification

Verifying programmed options, settings, and compressor start-up.

First Time Start-Up Procedures and System Checks

Detailed steps for initial unit start-up and system operation checks.

Superheat and Subcooling Checks

Critical checks for suction superheat and liquid subcooling.

Unit Operation

General Unit Description and Start-Up Sequence

Overview of unit function and initial start-up sequence.

Normal Running, Cycling, and Shutdown Procedures

Describes automatic operation, load adjustment, and shutdown procedures.

Maintenance

General Maintenance Requirements

Emphasizes regular maintenance for continuous operation.

Scheduled Maintenance Schedules

Outlines minor and major service tasks and recommended intervals.

Trouble Shooting

Troubleshooting Guide - Unit Operation and Flow Issues

Common issues like no display, low ambient, or low liquid temperature.

Sensor Calibration Data Reference

Troubleshooting High Pressure, Low Suction, and Start Issues

Addresses faults related to discharge pressure, suction pressure, and compressor start-up.

Sensor Calibration Data Details

Detailed calibration values for various temperature and pressure sensors.

Technical Data

Evaporator Pressure Drop and SE Model Limitations

HE Model Limitations and Fan Power Data

Electrical Data for SE Models

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