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York YLAA0515HE User Manual

York YLAA0515HE
206 pages
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YLAA0195 - YLAA0515
AIR-COOLED SCROLL CHILLERS
WITH MICROCHANNEL CONDENSER COILS
STYLE A (50 HZ)
57 - 142 TON
Products are produced at a
f a c i l i t y wh o s e q u a l i t y -
management systems are
ISO9001 certified.
R-410A
Issue Date:
October 5, 2020
035-21911-001
AIR-COOLED SCROLL CHILLER
INSTALLATION, OPERATION, MAINTENANCE
Supersedes 150.72-NM3 (811) Form 150.72-NM3 (1020)

Table of Contents

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York YLAA0515HE Specifications

General IconGeneral
BrandYork
ModelYLAA0515HE
CategoryChiller
LanguageEnglish

Summary

York YLAA Air-Cooled Scroll Chillers

General Safety Guidelines

Safety Symbols and Hazards

Explains safety symbols (DANGER, WARNING, CAUTION, NOTE) and general safety precautions for handling.

Manual Applicability and Responsibility

Details manual usage, responsibility for safety, and the scope of the document.

Equipment Misuse and Safety Considerations

Covers suitability for application, structural support, mechanical strength, and general access.

Product Description and Components

System Components Overview

Describes the main components: compressors, cooler (evaporator), and condenser.

Unit Controls and Interface

Details the microprocessor control center, display, keypad, and user interface.

Product Identification Number (PIN) Nomenclature

Explains the coding system for identifying unit model, capacity, efficiency, and options.

Refrigerant Flow Diagram

Illustrates the path of refrigerant through the chiller system components.

Process and Instrumentation Diagram

Shows the flow of refrigerant and chilled liquid, including control functions and components.

Installation Procedures

Installation Site and Clearances

Guidelines for selecting installation sites, considering outdoor locations and clearances.

Foundation and Mounting

Requirements for unit foundation, ground level, and rooftop installations.

Piping and Connection Requirements

Details on chilled liquid piping, pipework arrangement, and ductwork connections.

Wiring and Electrical Connections

Instructions for field wiring, power wiring, and specific control wiring inputs/outputs.

Technical Data and Specifications

Operational Limitations

Specifies temperature, flow, and voltage limitations for safe operation.

Physical Data and Dimensions

Provides detailed physical specifications for standard and high-efficiency units.

Electrical Information and Wiring Lugs

Details electrical data, notes, legends, and wiring lug specifications.

Vibration Isolator Data

Information on spring and seismic isolators, including cross-references and installation.

Commissioning Procedures

Pre-Startup Checks (Power Off)

Basic checks before unit startup, including inspection, refrigerant charge, and valves.

Startup Procedures (Power On)

Steps for applying power, checking settings, and verifying system operation.

Superheat and Subcooling Checks

Procedures for checking and adjusting superheat and subcooling for optimal performance.

Leak Checking and Unit Operation Sequence

Steps for leak checking and understanding the unit's operating sequence.

Unit Controls and Operation

MicroComputer Control Center Overview

Details the microprocessor control center, its components, and keypad functions.

Status Key Messages

Explains various status messages displayed by the chiller control system.

Unit Safeties and Warnings

Describes safety shutdowns, warnings, and their operational impact.

Display/Print Keys and Operation Data

Instructions for using display/print keys to view system parameters and data.

Setpoint Programming

Guides on programming cooling setpoints, ranges, and schedules via the control panel.

Unit Operation Modes and Capacity Control

Capacity Control Strategies

Explains how the chiller controls capacity based on temperature and pressure limits.

Return Chilled Liquid Control

Details the operation of return chilled liquid control for staging compressors.

Load Limiting Features

Describes features to limit unit loading based on desired values or remote signals.

Temperature Reset via Voltage or Current

Explains how to use voltage or current signals for remote temperature setpoint adjustments.

Service and Troubleshooting

Clearing History Buffers and Service Mode

Procedures for clearing history buffers and entering service mode for diagnostics.

Input/Output Verification

Details on checking digital and analog inputs/outputs using microboard connections.

Troubleshooting Common Problems

Provides solutions for common problems like no display, flow switch faults, and pressure issues.

Maintenance Procedures

Compressor and Coil Maintenance

Guidance on checking oil levels, oil analysis, and cleaning condenser coils.

Microchannel Coil Cleaning Instructions

Specific steps and precautions for cleaning microchannel condenser coils.

Communication Protocol Setup (BACnet/Modbus)

Details on configuring BACnet, Modbus, and YorkTalk 2 communication protocols.

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