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Displays symbols used to alert readers to areas of potential hazard.
Lists revisions made to the document, including technical and formatting changes.
Provides an overview of the YORK YLAA Air-Cooled Scroll Chillers and the manual's scope.
Details the warranty terms and conditions for the chiller equipment and materials.
Outlines safety standards and quality compliance for the chillers.
Defines the primary responsibilities of individuals operating or working on the machinery.
Explains the use of hazard alert terms (DANGER, WARNING, CAUTION, NOTE) within the document.
Covers limitations and warnings regarding improper application, structural support, and general access.
Highlights hazards associated with the unit's refrigerant vapor and liquid under pressure.
Details safety precautions for electrical work, emphasizing power isolation and qualified personnel.
Advises caution regarding sharp metal edges on condenser coils and other components.
Explains the function of the unit's emergency stop switch for immediate shutdown.
Introduces YORK YLAA Air-Cooled Scroll Chillers and their applications.
Provides an overview of the main components and systems of the chiller.
Describes the hermetic, scroll compressors with axial and radial compliant designs.
Details the direct expansion evaporator with copper tubes and brass water baffles.
Explains the microchannel condenser coils, fans, and motors used in the unit.
Describes the accessory for operating units at high ambient temperatures above 46°C (115°F).
Lists typical information that can be displayed and printed from the control center.
Explains the function of the ENTRY section for setting or modifying system values.
Details the various setpoints that can be updated via the control panel.
Outlines the functions available under the UNIT section for setting time and unit options.
Describes the master ON/OFF switch for unit activation or deactivation.
Details the accessory for units operating above 46°C (115°F), including discharge pressure transducers.
Explains how the unit interfaces with building automation systems via analog inputs and RS232.
Lists the components found within the power panel, including terminals, contactors, and overloads.
Lists various accessories and options available for the chiller unit.
Explains the function of hot gas bypass for stable operation at low capacities.
Describes the optional higher water side design pressure for the DX cooler.
Details the flange adapters for grooved end pipe connections to the cooler.
Explains the necessity and types of flow switches for unit operation and safety.
Describes the factory-installed Hydro-Kit for water glycol systems, including its components.
Covers options for condenser coil protection and enclosure panels for various applications.
Identifies key components of the chiller unit shown in the front view diagram.
Identifies key components of the chiller unit shown in the side view diagram.
Details the components within the power panel, such as fan contactors and compressor overloads.
Identifies components within the control and power panels, including the microcomputer and keypad.
Explains the structure and meaning of the unit's Product Identification Number (PIN).
Illustrates the path of refrigerant through the unit, including sensors and transducers.
Depicts the process flow and instrumentation of the chiller system.
Provides guidelines for unit delivery, storage precautions, and inspection upon receipt.
Details the procedure for inspecting the unit for transit damage and reporting any issues.
Outlines the proper procedures and safety precautions for moving the chiller unit.
Provides specific instructions and warnings for rigging and lifting the chiller unit safely.
Lists essential checks to be performed before placing the chiller units into operation.
Emphasizes taking care to avoid damage to the assembled units during handling.
Stresses the importance of inspecting for possible transit damage and reporting it immediately.
Provides guidance on selecting an installation site and necessary clearances for optimal performance.
Specifies requirements for a flat, level foundation capable of supporting the unit's weight.
Details considerations for ground level installations, including slab requirements and security.
Provides guidance for rooftop installations, focusing on structural strength and roof integrity.
Advises placement away from occupied spaces to avoid noise issues from compressor and fan operation.
Explains the installation and adjustment of optional spring isolators for vibration control.
Covers general guidelines, precautions, and recommendations for connecting the chilled liquid piping.
Suggests pipework arrangements for single and multiple unit installations.
Outlines recommendations for duct work to ensure satisfactory unit operation and prevent warranty issues.
Details power and control wiring requirements, including recommendations for copper wiring.
Explains the function and connection of normally-open alarm contacts for system status monitoring.
Describes how to wire dry contacts for remote start and stop functionality.
Details the procedure for achieving immediate shutdown via a field-installed dry contact.
Explains how to reset the chilled liquid setpoint using voltage or current signals.
Describes the load limiting feature and its connections for controlling unit loading.
Specifies how the flow switch is field wired to the control panel for safety.
Explains the function and required pre-energization time for compressor crankcase heaters.
Provides the pressure settings for high and low side relief valves.
Details the pressure settings and operation of the high pressure cutout switch.
Lists critical operational parameters, including temperature, flow, and voltage limitations.
Specifies absolute voltage limits to prevent compressor damage.
Provides curves and factors related to heat exchanger water flow rates and pressure drops.
Presents physical dimensions, weights, and component specifications for standard efficiency units.
Lists physical dimensions, weights, and component specifications for high efficiency units.
Details power supply requirements, voltage ranges, and circuit protection for the micropanel.
Provides essential notes and explanations regarding electrical codes, wiring, and component specifications.
Contains detailed electrical data, including ampacity, fuse/breaker sizes, and wiring lug specifications.
Lists the specific wiring lug types and sizes required for electrical connections.
Explains electrical component designations and provides a legend for schematic interpretation.
Continues the explanation of electrical notes and provides further legend details for schematics.
Presents the elementary wiring diagrams for YLAA0195 models, broken down into sheets.
Provides the second sheet of elementary wiring diagrams for YLAA0195 units.
Shows the first sheet of connection wiring diagrams for YLAA0195 units, illustrating terminal block layouts.
Presents the first sheet of elementary wiring diagrams for YLAA0220-YLAA0515 models.
Illustrates the connection diagrams for the power panel components for YLAA0220-YLAA0515.
Shows the connection diagrams for the micropanel components.
Illustrates connection diagrams for various power options available on the units.
Details the wiring connections specific to the compressor units.
Explains the fan mapping and sequencing logic for condenser fans.
Depicts wiring diagrams for different single-point power supply configurations.
Provides detailed English dimensions for the YLAA0195HE model.
Specifies recommended clearances for all chiller models for proper installation and airflow.
Provides general information on isolator selection and placement based on chiller model and weight.
Lists cross-reference data for one-inch deflection spring isolators, including model numbers and capacities.
Provides a cross-reference for seismic isolators, including part numbers, colors, and weight ranges.
Offers a cross-reference for Duralene isolators, including dimensions, part numbers, and weight ranges.
States that commissioning must be performed by authorized Johnson Controls personnel.
Outlines essential checks to be performed with the unit power switched OFF.
Requires verification of site voltage supply against unit requirements.
Details the checks to be performed after applying power to the chiller.
Lists pre-startup checks to be performed on the system prior to initial start-up.
Describes the process for calculating and adjusting subcooling and checking suction superheat.
Instructs to perform leak checks on compressors, fittings, and piping to ensure no leaks.
Explains the sequence of operation for the chiller during start-up and normal running conditions.
Introduces the microprocessor-based control system for the liquid chiller.
Provides an overview of the control center's purpose and basic components.
Describes the IPU II board (microprocessor) and I/O board (inputs/outputs) that form the controller.
Explains the function of the master ON/OFF switch for unit operation.
Details the 40-character LCD display used for system parameters and operator messages.
Describes the 12-button keypad for accessing system parameters, setpoints, and diagnostics.
Explains the purpose of the battery backup for retaining programmed values during power loss.
Details the transformer used to supply power to the microprocessor board and sensors.
Notes that the number of compressors is programmable via the Program Key.
Explains how to use the STATUS key to determine current chiller operating status and view messages.
Describes the various unit status messages, including running, cooling demand, and fault statuses.
Lists general status messages like UNIT SWITCH OFF, REMOTE CONTROLLED SHUTDOWN, etc.
Explains safety messages that indicate system shutdowns due to exceeded thresholds.
Details system safeties that cause individual system shutdowns and auto-reset behavior.
Covers unit safeties causing all compressor shutdowns, including low ambient and low liquid temperature cutouts.
Provides a quick reference list of status key messages and their meanings.
Explains how to use the DISPLAY/PRINT keys to retrieve and print system information.
Describes how to access and scroll through unit and system operating parameters using the OPER DATA key.
Offers a quick reference table for information available via the OPER DATA key.
Explains how to obtain real-time or history printouts of system data using the PRINT key.
Shows a sample printout of current system operating parameters.
Explains how to access and view past safety shutdown information stored in history buffers.
Describes how to obtain a printout of the last 9 safety shutdowns, providing troubleshooting data.
Details the use of arrow keys for navigating screens and changing values.
Explains the function of the ENTER/ADV key for confirming changes and advancing to the next parameter.
Explains how to program the cooling setpoint and range using the control panel.
Details the display and programming for leaving chilled liquid temperature control.
Explains control based on return chilled liquid temperature, including setpoint and range programming.
Describes how remote setpoints are displayed and updated, and that they are not locally programmable.
Explains how to set up the seven-day daily schedule and holiday settings for unit operation.
Covers programmable parameters under the PROGRAM key, including discharge pressure cutout.
Covers programmable parameters under the PROGRAM key, including suction pressure cutout.
Covers programmable parameters under the PROGRAM key, including low ambient temp cutout.
Covers programmable parameters under the PROGRAM key, including leaving liquid temp cutout.
Explains the programmable timer to prevent system short cycling and ensure compressor motor cooling.
Explains the programmed pressure value for staging condenser fans on.
Explains the programmed differential pressure for staging condenser fans off.
Notes the importance of programming the total number of compressors for cooling stage availability.
Stresses the need to program the number of fans per system to match the unit's configuration.
Explains how to program trip voltage for high current protection and calibrate current readings.
Details programming trip voltage for unit high current protection.
Provides a formula for calculating and programming trip voltage based on compressor and fan RLA.
Provides an example calculation for unit trip volts for 460VAC chillers.
Explains how to scroll through and change user-programmable options using the OPTIONS key.
Lists the available language options for the control panel display.
Describes the system switches for controlling individual system operation (ON/OFF) and their effect on pumpdown.
Specifies whether the unit uses water or glycol for chilled liquid cooling and its programming range.
Details the ambient control type, including low ambient cutout adjustability and kit requirements.
Explains the selection between local control and remote control via ISN/RCC systems.
Covers control modes based on return or leaving chilled liquid temperature.
Allows selection of display units between Imperial (°F/PSIG) and Scientific International (°C/barg).
Explains manual and automatic lead/lag control options for equalizing run hours between systems.
Specifies condenser fan control based on discharge pressure only, and warnings for R-410A units.
Details the manual override mode for bypassing the daily schedule, its function, and automatic disabling.
Covers options for current feedback monitoring, including none, one per unit, or one per system.
Explains automatic or manual restart behavior after a power failure.
States that soft start must be disabled on all chillers.
Emphasizes that the unit type must be set to "LIQUID CHILLER" to prevent component damage.
Notes that refrigerant type (R-410A) is selected under Service Mode and must be programmed correctly.
Explains that expansion valve type (thermostatic or electronic) is selected under Service Mode.
Describes the process for updating the chiller's operating program using a Flash Card.
Outlines the available options for remote temperature reset input using voltage or current signals.
Details the pump control logic for onboard or external pumps based on various conditions.
Mentions that this option appears if YORK HYDRO KIT PUMPS = 2 is selected and should not currently be used.
Explains how to display, set, and program the unit's current date, time, and meridian.
Describes the initiation of the start sequence and capacity control functions based on cooling demand.
Explains anticipatory controls to prevent low-pressure cutouts by limiting loading.
Details controls that unload the system before high discharge pressure safety limits are reached.
Explains how the unit controls leaving chilled liquid temperature based on setpoints and cooling ranges.
Covers lead/lag options for equalizing run hours and compressor sequencing for optimal operation.
Describes how the setpoint can be temporarily adjusted to prevent excessive compressor cycling.
Explains control based on return chilled liquid temperature, including compressor staging and loading/unloading formulas.
Details lead/lag logic and compressor sequencing to equalize run hours and prevent short cycling.
Explains the programmable timer to prevent system short cycling and ensure compressor motor cooling.
Describes the non-programmable timer that prevents simultaneous compressor starts on multi-system units.
Covers the control logic for evaporator pumps based on compressor status and schedule.
Explains that the evaporator heater is controlled by ambient air temperature for freeze protection.
Details the pump-down feature upon system shut-off for refrigerant management.
Outlines how condenser fan operation is programmed via OPTIONS and PROGRAM keys using discharge pressure.
Explains the feature that prevents unit loading beyond desired values, detailing stages and compressor limitations.
Indicates compressor run status via the closure of contacts at XTBC2 terminals.
Describes how system or unit shutdowns are indicated by alarm contacts opening.
Details how to reset chilled liquid setpoints using external voltage or current signals and provides calculation formulas.
Instructs on how to clear the history buffers and provides a warning about losing important information.
Explains how to enter Service Mode to enable/disable outputs, change configurations, and view inputs.
Covers chiller configuration settings like data logging, soft start, refrigerant type, and expansion valve type.
Explains how to view analog and digital inputs to the microboard, including pressure and temperature sensor connections.
Provides a quick reference list of connection points and descriptions for microboard inputs and outputs.
Explains digital inputs, their voltage states (30VDC/0VDC), and connection points.
Details analog temperature inputs and their connections to the microboard, referencing voltage correlation tables.
Details connections and voltage readings for the system 1 discharge pressure transducer.
Details connections and voltage readings for the system 2 discharge pressure transducer.
Explains digital outputs, their locations on terminal blocks, and their control via the microprocessor.
Lists the necessary parts for printer installation, including the printer model and cable components.
Details the assembly and wiring procedure for connecting the printer to the microboard.
Explains how to obtain a printout by using the PRINT key in conjunction with OPER DATA or HISTORY keys.
Stresses the owner's responsibility for maintenance and Johnson Controls' limited liability for failures due to improper maintenance.
Covers maintenance procedures for compressors, including oil level checks and oil analysis.
Explains how to check compressor oil levels in stabilized running conditions.
Advises on analyzing oil samples for contaminants and the importance of system cleaning.
States that condenser fan motors are permanently lubricated and require no maintenance.
Emphasizes keeping condenser coil surfaces clean and exercising care during cleaning to avoid fin damage.
Recommends regular checks of operating temperatures and pressures against limitations.
Describes the Real Time Clock chip and its battery backup for maintaining date/time and setpoints.
Warns that disconnecting power to the evaporator heater below freezing can cause damage.
Recommends periodic inspections of the unit for loose hardware, component operation, and refrigerant leaks.
Provides detailed procedures and DO NOTs for cleaning microchannel coils to prevent damage.
Details analog write points and their Modbus register addresses for BACnet/Modbus connections.
Details binary write points and their Modbus register addresses.
Details analog read-only points and their Modbus register addresses.
Details binary monitor-only points and their Modbus register addresses.
Provides notes regarding communication protocols and object types used for BAS integration.
Continues notes on communication protocols, including BACnet object types and unit conversions.
General