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General| Model | YLAA0485SE |
|---|---|
| Cooling Capacity | 485 tons |
| Compressor Type | Screw |
| Refrigerant Type | R-134a |
| Tons | 485 |
| Type | Air-Cooled |
| Sound Power Level | 92 dBA |
| Operating Temperature Range | 20°F to 115°F |
| Power Supply | 460V/3Ph/60Hz |
Overview of YORK YLAA air-cooled scroll chillers for HVAC applications.
Details Johnson Controls' warranty terms for chiller equipment and materials.
Discusses chiller design standards, safety codes, and quality accreditation.
Outlines the primary responsibilities of individuals operating or working on the machinery.
Explains terminology and symbols used in the document to indicate hazards.
Covers limitations on application suitability, structural support, and mechanical strength.
Describes the YORK YLAA Air-Cooled Scroll Chillers and their intended use.
Provides an overview of the chiller's main components like compressors, cooler, and condenser.
Illustrates and labels the key physical components of the chiller unit.
Explains the nomenclature and coding system for identifying chiller models and configurations.
Presents a schematic showing the flow and control of refrigerant and chilled liquid in the system.
Lists various optional features and accessories available for the chillers.
Outlines precautions for storing the chiller unit before installation to maintain quality.
Details the procedure for inspecting the unit upon delivery for transit damage.
Provides instructions and warnings for safely lifting and moving the chiller unit.
Specifies pre-operation checks for shipping damage and proper installation setup.
Guides site selection, foundation requirements, and necessary clearances for optimal operation.
Covers power wiring, control wiring inputs/outputs, and specific connection details.
Details how to connect external signals and controls to the unit's input terminals.
Explains the unit's output signals for alarms, run status, and other operational feedback.
Defines the absolute operating limits for temperature, flow, and voltage to prevent damage.
Provides curves and factors related to evaporator pressure drop and glycol correction.
Lists dimensions, weights, component counts, and physical specifications for various models.
Covers power supply details, voltage ranges, and electrical component specifications.
Explains wiring standards, legends, circuit breaker sizing, and grounding requirements.
Provides detailed elementary and connection wiring diagrams for YLAA units.
Emphasizes that only authorized Johnson Controls personnel should perform commissioning.
Lists essential checks to perform on the unit before applying power, ensuring safety.
Outlines checks and procedures after applying power, including system checks and sensor verification.
Provides a comprehensive checklist for verifying all system components and settings before initial startup.
Details the process for verifying and adjusting refrigerant superheat and subcooling levels.
Specifies the procedure for checking the refrigerant circuit for leaks after installation.
Describes the step-by-step process of how the chiller starts and operates under various conditions.
Introduces the microprocessor-based control system and its components.
Provides a general overview of the control center's function and components.
Describes the function and interaction of the IPU II and I/O boards within the control system.
Explains how to use the STATUS key to view unit operating status and diagnostic messages.
Details how to use the DISPLAY/PRINT keys to access and output system operating data.
Provides a quick guide to viewing various operating parameters via the OPER DATA key.
Explains the function of the UP, DOWN, and ENTER/ADV keys for navigating and programming the control panel.
Guides the user on how to view and program cooling setpoints and ranges.
Details how to access and modify various programmable parameters like cutouts and timers.
Covers user-programmable options such as language, system switches, and unit types.
Explains how to view and set the unit's current date, time, and date for accurate scheduling.
Describes how the chiller adjusts capacity based on cooling demand and system status.
Explains the anticipatory control that prevents low-pressure cutouts by limiting loading.
Details the feature that unloads the system to prevent high discharge pressure faults.
Explains the control strategy for maintaining leaving chilled liquid temperature setpoints.
Describes the control strategy based on return chilled liquid temperature, used for staging compressors.
Assures systems do not short cycle, providing time for compressor motors after starting.
Details how condenser fans are controlled based on discharge pressure and ambient conditions.
Explains how to limit the unit's loading to prevent exceeding desired values.
Describes how system or unit shutdowns are indicated via alarm contacts.
Instructions for clearing historical fault data, with a caution about data loss.
Guides the user on how to enter and navigate the Service Mode for advanced diagnostics.
Details how to view and modify unit outputs, operating hours, and refrigerant type in Service Mode.
Covers programming selections for data logging, soft start, refrigerant type, and expansion valve type.
Explains how to view analog and digital inputs for troubleshooting sensor and switch issues.
Provides reference tables and procedures for checking digital and analog inputs/outputs.
Explains digital input connections and voltage states for switches and contacts.
Details connections for temperature sensors and provides a voltage correlation table.
Describes pressure sensor connections and provides formulas for voltage-to-pressure conversion.
Lists required parts and assembly instructions for connecting a printer to the microboard.
Offers solutions for common problems like no display, flow switch faults, and low suction pressure.
States the owner's responsibility for maintenance and Johnson Controls' warranty liability.
Covers procedures for checking oil level and performing oil analysis for compressor health.
Notes that condenser fan motors are permanently lubricated and require no maintenance.
Advises on keeping condenser coils clean and exercising care during cleaning.
Recommends regular checks of operating temperatures and pressures against limitations.
Provides specific instructions and precautions for cleaning microchannel coils to avoid damage.
Explains how to establish serial communication for chiller data and control.
Details the data map and communication parameters for the YorkTalk 2 protocol.
Provides tables for converting between Fahrenheit and Celsius temperatures.
Offers a chart for R410A pressure and temperature correlations.
Explains the conversion method for temperature values between Fahrenheit and Celsius.
