Table of Contents
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AIR-COOLED SCROLL CHILLER
Supersedes 150.72-NM3 (811)
Form 150.72-NM3 (1020)
INSTALLATION, OPERATION, MAINTENANCE
035-21911-001
YLAA0195 - YLAA0515
AIR-COOLED SCROLL CHILLERS
WITH MICROCHANNEL CONDENSER COILS
STYLE A (50 HZ)
57 - 142 TON
R-410A
Issue Date:
Products are produced at a
f a c i l i t y w h o s e q u a l i t y -
management systems are
October 5, 2020
ISO9001 certified.
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Table of Contents
Troubleshooting
Related Manuals for York YLAA0515HE
Summarization of Contents
SECTION 1 – GENERAL CHILLER INFORMATION AND SAFETY
Introduction, Warranty, and Safety Standards
Overview of manual, warranty terms, and compliance with safety standards.
User Responsibility and Manual Conventions
Defines user responsibility and explains hazard symbols and manual terms.
Equipment Misuse and Hazards
Warns against improper use, structural issues, and general access safety.
System Safety and Component Precautions
Details pressure system, electrical safety, rotating parts, and component-specific hazards.
SECTION 2 – PRODUCT DESCRIPTION
Introduction and General System Overview
Describes the chiller and its main components like compressors and coolers.
Component Details and Options
Covers evaporator, condenser, motors, ambient kits, and control panel features.
Unit Controls and Interface Options
Details unit ON/OFF switch, display, BAS interface, and power panel.
Accessory and System Options
Covers power, control, compressor, piping, and evaporator options.
SECTION 2 – PRODUCT DESCRIPTION (CONTINUED)
Specialized Component and Protection Options
Details hot gas bypass, cooler, flow switch, and condenser/cabinet options.
Panel, Sound, and Vibration Reduction Options
Covers louvred panel types, sound attenuation, and vibration isolator options.
UNIT COMPONENTS OVERVIEW
FIG. 1 – UNIT COMPONENTS FRONT VIEW
Diagram illustrating and labeling the front view of the unit's main components.
CONTROL / POWER PANEL COMPONENTS
FIG. 3 – POWER PANEL COMPONENTS LAYOUT
Illustrates key electrical components within the power panel.
PRODUCT IDENTIFICATION NUMBER (PIN)
BASIC UNIT NOMENCLATURE EXPLANATION
Explains the structure and meaning of the unit's product identification number (PIN).
PRODUCT IDENTIFICATION NUMBER (PIN) OPTIONS
Power, Design, and Control Options
Details options related to power connections, design series, and control features.
Ambient, Language, and Brine Options
Covers ambient kit, language display, and low-temperature brine options.
Component and Flow Switch Options
Details options for hot gas bypass, cooler types, and flow switch configurations.
Coil, Fan, and Enclosure Options
Details options for coils, fan motors, enclosure panels, and acoustic blankets.
PRODUCT IDENTIFICATION NUMBER (PIN) OPTIONS (CONTINUED)
Sound Fan, Paint, and Isolator Options
Details options for sound fan types, paint, and vibration isolators.
Pump Package and Location Options
Details pump package options and manufacturing location selections.
PRODUCT IDENTIFICATION NUMBER (PIN) (CONTINUED)
FIG. 5 – REFRIGERANT FLOW DIAGRAM
Illustrates the refrigerant flow path including sensors and transducers.
PROCESS AND INSTRUMENTATION DIAGRAM
FIG. 6 – PROCESS AND INSTRUMENTATION DIAGRAM
Diagram showing process flow, components, and control functions with explanations.
SECTION 3 – HANDLING AND STORAGE
Delivery, Storage, and Inspection Procedures
Guidelines for unit delivery, storage precautions, and inspection upon receipt.
Moving and Lifting the Chiller Safely
Details procedures and safety precautions for moving and lifting the chiller unit.
RIGGING INSTRUCTIONS
FIG. 7 – UNIT RIGGING/LIFTING DIAGRAMS
Diagrams illustrating typical unit rigging and lifting arrangements with safety warnings.
SECTION 4 – INSTALLATION
Installation Checklist and Handling Precautions
Lists pre-operation checks and provides guidance on unit handling.
Inspection and Site Selection Criteria
Details unit inspection and criteria for selecting appropriate installation locations.
Location and Clearances Requirements
Provides guidance on site selection and required clearances for proper installation.
SECTION 4 – INSTALLATION (CONTINUED)
Foundation and Mounting Guidelines
Specifies requirements for unit mounting foundations and ground level placement.
Rooftop, Noise, and Isolator Considerations
Covers rooftop installation, noise sensitivity, and optional spring isolators.
CHILLED LIQUID PIPING GUIDELINES
Provides general guidelines and precautions for connecting chilled liquid piping.
SECTION 4 – INSTALLATION (CONTINUED)
Piping and Flow Switch Installation Details
Discusses piping layout, strainers, and flow switch installation requirements.
PIPEWORK ARRANGEMENT GUIDANCE
Presents suggested pipework arrangements for single and multiple unit installations.
SECTION 4 – INSTALLATION (CONTINUED)
DUCT WORK CONNECTION REQUIREMENTS
Provides general requirements and recommendations for duct work connections.
WIRING GUIDELINES AND CONNECTIONS
Details factory and field wiring, power wiring, and control wiring connections.
SECTION 4 – INSTALLATION (CONTINUED)
Alarm, Remote Control, and Temp Reset Wiring
Details wiring for alarm status, remote control, and temperature reset inputs.
Load Limit Input and Flow Switch Wiring
Explains wiring for load limiting inputs and flow switch connections.
Compressor Heaters and Pressure Safety Devices
Covers compressor heaters, relief valves, and high pressure cutout specifications.
SINGLE-POINT SUPPLY CONNECTION OPTIONS
FIG. 9 – SINGLE-POINT SUPPLY CONNECTION DIAGRAM
Diagram illustrating single-point power connection options for terminal blocks or disconnects.
USER CONTROL WIRING INPUTS
FIG. 10 – CONTROL WIRING INPUTS DIAGRAM
Diagram showing typical control wiring input connections to the microboard.
USER CONTROL WIRING OUTPUTS
FIG. 11 – CONTROL WIRING OUTPUTS DIAGRAM
Diagram illustrating control wiring output connections from the microboard.
SECTION 5 – TECHNICAL DATA
Operational Limitations and Voltage Requirements
Specifies operational temperature/flow limitations and voltage requirements.
Temperature, Flow, and Voltage Tables
Presents tables for operational limits and voltage specifications.
SECTION 5 – TECHNICAL DATA (CONTINUED)
Heat Exchanger Flow and Glycol Correction Factors
Provides evaporator pressure drop curves and glycol correction factors.
PHYSICAL DATA (ENGLISH)
Standard Efficiency Models Data
Table detailing physical specifications for standard efficiency YLAA models.
TABLE 4 – PHYSICAL DATA (ENGLISH)
Presents physical data including dimensions, weights, and component counts.
PHYSICAL DATA (ENGLISH) (CONTINUED)
High Efficiency Models Data
Table detailing physical specifications for high efficiency YLAA models.
TABLE 4A – PHYSICAL DATA (ENGLISH)
Presents physical data for high efficiency YLAA models.
ELECTRICAL INFORMATION
Micropanel Power and Voltage Range Tables
Provides tables for micropanel power supply and voltage range specifications.
ELECTRICAL NOTES
Notes, Legend, and Wiring Considerations
Explains electrical notes, legends, and wiring practices per NEC.
ELECTRICAL DATA
TABLE – ELECTRICAL DATA DETAILS
Presents detailed electrical data for single and dual point configurations.
WIRING LUGS SPECIFICATIONS
Wiring Lugs Table Details
Specifies wiring lug types and sizes for different models and connections.
ELECTRICAL NOTES AND LEGEND
Component Designations and Descriptions
Lists common electrical component designations and their descriptions.
ELECTRICAL NOTES AND LEGEND (CONTINUED)
General Wiring Guidelines and Implementation Notes
Provides general notes on wiring practices, color codes, and specific wiring implementation details.
WIRING DIAGRAMS
ELEMENTARY WIRING DIAGRAMS - YLAA0195
Provides elementary wiring diagrams for YLAA0195 models.
FIG. 12-20: YLAA0195 Elementary Wiring Diagrams (Sheets 1-9)
Sheets 1-9 of elementary wiring diagrams for YLAA0195 units.
CONNECTION WIRING DIAGRAMS - YLAA0195
FIG. 21 – YLAA0195 CONNECTION WIRING DIAGRAM SHT 1
Diagram showing sheet 1 of connection wiring for YLAA0195.
FIG. 22 – YLAA0195 CONNECTION WIRING DIAGRAM SHT 2
Diagram showing sheet 2 of connection wiring for YLAA0195.
FIG. 23 – YLAA0195 CONNECTION WIRING DIAGRAM SHT 3
Diagram showing sheet 3 of connection wiring for YLAA0195.
FIG. 24 – YLAA0195 CONNECTION WIRING DIAGRAM SHT 4
Diagram showing sheet 4 of connection wiring for YLAA0195.
CONNECTION WIRING DIAGRAMS - YLAA0195 (CONTINUED)
FIG. 25 – YLAA0195 CONNECTION WIRING DIAGRAM SHT 5
Diagram showing sheet 5 of connection wiring for YLAA0195.
FIG. 26 – YLAA0195 CONNECTION WIRING DIAGRAM SHT 6
Diagram showing sheet 6 of connection wiring for YLAA0195.
FIG. 27 – YLAA0195 CONNECTION WIRING DIAGRAM SHT 7
Diagram showing sheet 7 of connection wiring for YLAA0195.
ELEMENTARY WIRING DIAGRAMS - YLAA0220 - YLAA0515
FIG. 28 – YLAA0220-YLAA0515 ELEMENTARY WIRING DIAGRAM SHT 1
Diagram showing sheet 1 of elementary wiring for YLAA0220-YLAA0515.
FIG. 29 – YLAA0220-YLAA0515 ELEMENTARY WIRING DIAGRAM SHT 2
Diagram showing sheet 2 of elementary wiring for YLAA0220-YLAA0515.
FIG. 30 – YLAA0220-YLAA0515 ELEMENTARY WIRING DIAGRAM SHT 3
Diagram showing sheet 3 of elementary wiring for YLAA0220-YLAA0515.
FIG. 31 – YLAA0220-YLAA0515 ELEMENTARY WIRING DIAGRAM SHT 4
Diagram showing sheet 4 of elementary wiring for YLAA0220-YLAA0515.
CONNECTION DIAGRAMS - YLAA0220 - YLAA0515
POWER PANEL CONNECTION DIAGRAMS
Illustrates power panel connections for YLAA0220-YLAA0515 models.
FIG. 32-34: YLAA0220-YLAA0515 Connection Diagrams
Sheets 1-3 of power panel and micro-panel connection diagrams.
CONNECTION DIAGRAMS - YLAA0220 - YLAA0515 (CONTINUED)
MICRO-PANEL CONNECTIONS
Details micro-panel connections for YLAA0220-YLAA0515 units.
SECTION 5 – TECHNICAL DATA
CONDENSER FAN MAPPING AND SEQUENCING
Diagrams showing condenser fan locations and wiring configurations.
WIRING DIAGRAM - POWER SUPPLY
SINGLE POINT WIRING OPTIONS DIAGRAMS
Illustrates single point wiring configurations for power supply.
DUAL PUMP WIRING DIAGRAM
FIG. 38 – DUAL PUMP WIRING DIAGRAM
Diagram illustrating wiring for dual pump configurations.
WIRING DIAGRAMS
FIG. 39 – WIRING DIAGRAM
Diagram showing compressor and fan wiring configurations.
LAYOUT - POWER BLOCKS AND TRANSFORMERS
FIG. 40 – LAYOUT DIAGRAM
Diagram showing the layout of power blocks and transformers.
DIMENSIONS (ENGLISH)
YLAA0195HE DIMENSIONS
Diagrams showing overall dimensions for the YLAA0195HE model.
DIMENSIONS - YLAA0220HE, 0260HE, 0285SE, & 320SE (ENGLISH)
FIG. 42 – DIMENSIONS DIAGRAM
Diagrams showing overall dimensions for specified YLAA models.
DIMENSIONS - YLAA0300HE,YLAA0360SE, YLAA0400SE (ENGLISH)
FIG. 43 – DIMENSIONS DIAGRAM
Diagrams showing overall dimensions for specified YLAA models.
DIMENSIONS - YLAA0435SE (ENGLISH)
FIG. 44 – DIMENSIONS DIAGRAM
Diagrams showing overall dimensions for the YLAA0435SE model.
DIMENSIONS - YLAA0350HE (ENGLISH)
FIG. 45 – DIMENSIONS DIAGRAM
Diagrams showing overall dimensions for the YLAA0350HE model.
DIMENSIONS - YLAA0390HE, YLAA0485SE (ENGLISH)
FIG. 46 – DIMENSIONS DIAGRAM
Diagrams showing overall dimensions for specified YLAA models.
DIMENSIONS - YLAA0440HE (ENGLISH)
FIG. 47 – DIMENSIONS DIAGRAM
Diagrams showing overall dimensions for the YLAA0440HE model.
DIMENSIONS - YLAA0455HE (ENGLISH)
FIG. 48 – DIMENSIONS DIAGRAM
Diagrams showing overall dimensions for the YLAA0455HE model.
DIMENSIONS - YLAA0515HE (ENGLISH)
FIG. 49 – DIMENSIONS DIAGRAM
Diagrams showing overall dimensions for the YLAA0515HE model.
TECHNICAL DATA – CLEARANCES
FIG. 50 – UNIT CLEARANCES LAYOUT
Diagram illustrating required clearances around the unit for all models.
WEIGHT DISTRIBUTION AND ISOLATOR MOUNTING POSITIONS
GENERAL ISOLATOR INFORMATION
Provides guidelines for selecting and installing isolators based on chiller weight.
YLAA0195HE to YLAA0320SE Isolator Data
Tables detailing isolator weights and locations for specific YLAA models.
YLAA0300HE to YLAA0485SE Isolator Data
Tables detailing isolator weights and locations for specific YLAA models.
YLAA0440HE to YLAA0515HE Isolator Data
Tables detailing isolator weights and locations for specific YLAA models.
ISOLATOR DATA
ONE INCH DEFLECTION SPRING ISOLATOR CROSS-REFERENCE
Cross-reference table for one-inch deflection spring isolators by model number and capacity.
ONE INCH DEFLECTION SPRING ISOLATORS INSTALLATION INSTRUCTIONS
INSTALLATION PROCEDURES
Step-by-step instructions for installing one-inch deflection spring isolators.
SEISMIC ISOLATOR CROSS-REFERENCE
Y2RS SEISMIC ISOLATOR DATA
Cross-reference table for seismic isolators by part number, color, and weight range.
SEISMIC ISOLATOR INSTALLATION AND ADJUSTMENT INSTRUCTIONS
INSTALLATION AND ADJUSTMENT PROCEDURES
Step-by-step instructions for installing and adjusting seismic isolators.
DURALENE ISOLATOR CROSS-REFERENCE
RD-STYLE DURALENE ISOLATOR DATA
Cross-reference table for Duralene isolators by model type, dimensions, and weight range.
INSTALLATION OF DURULENE VIBRATION ISOLATORS INSTRUCTIONS
INSTALLATION PROCEDURES
Step-by-step instructions for installing Duralene vibration isolators.
SECTION 6 – COMMISSIONING
Commissioning Personnel and Procedure
Specifies authorized personnel and outlines the commissioning process using check lists.
PREPARATION – POWER OFF CHECKS
Basic checks before powering on, including inspection, refrigerant charge, and valve operation.
Compressor Oil and Fan Checks
Details procedures for checking compressor oil level/analysis and fan condition.
Isolation, Power Connections, and Grounding
Ensures proper electrical isolation, connections, and grounding.
SECTION 6 – COMMISSIONING (CONTINUED)
Supply Voltage and Power On Procedures
Verifies supply voltage and details procedures for powering on the chiller.
Switch Settings and System Checks
Ensures correct switch settings and checks control panel display.
Compressor Heater, Water System, and Flow Switch Checks
Verifies compressor heaters, water system, and flow switch installation.
Temperature Sensor Checks and Operational Limits
Ensures temperature sensors are correctly installed and within operational limits.
EQUIPMENT PRE-STARTUP & STARTUP CHECKLIST
PRE-STARTUP SYSTEM CHECKS (NO POWER)
Lists checks for unit, piping, refrigerant, oil level, and water pumps before startup.
COMPRESSOR HEATERS AND STARTUP PANEL CHECKS
Details compressor heater application and panel checks before startup.
COMMISSIONING PROCEDURES
System Shutdown and Fan Cycling
Describes procedures for turning systems OFF and cycling condenser fans.
Compressor Rotation Check and Sequence
Ensures correct compressor rotation and checks system sequencing.
CHECKING SUPERHEAT AND SUBCOOLING
Subcooling Calculation and Verification
Details the process for calculating and verifying subcooling temperature.
Suction Superheat Check and Leak Testing
Covers checking suction superheat and performing leak tests.
UNIT OPERATING SEQUENCE
Operating Sequence Overview
Describes the chiller's operating sequence from power application to shutdown.
SECTION 7 – UNIT CONTROLS
YORK MILLENNIUM CONTROL CENTER OVERVIEW
Introduction to the microprocessor-based control system and its components.
IPU II and I/O Boards Functionality
Details the roles of the IPU II and I/O boards in chiller control.
Keypad and Display Interaction
Explains how the keypad and display are used for programming and monitoring.
Transformer and Compressor Programming
Describes the transformer function and programming the number of compressors.
STATUS KEY MESSAGES
Unit Status and General Messages
Explains how to check unit status and lists general status messages.
Specific Status Messages
Details messages like No Cool Load, Comps Run, and Limiting conditions.
UNIT FAULTS AND WARNINGS
System Safeties and Faults
Describes faults causing system shutdowns like High Discharge Pressure and Low Suction Pressure.
Unit Safeties and Warnings
Covers unit safeties like Low Ambient Temp and Low Battery warnings.
DISPLAY/PRINT KEYS
OPER DATA Key Usage
Explains how to access and scroll through operating data screens.
Specific Operating Data Displays
Details displays for Chilled Liquid Temps and Ambient Air Temp.
OPER DATA QUICK REFERENCE LIST
TABLE 9 – OPERATION DATA QUICK REFERENCE
Provides a quick reference list for information available under the OPER DATA key.
Print Key and Operating Data Printout
Real-time and History Data Printout
Explains how to obtain printouts of real-time data or history of safety shutdowns.
History Displays and Printout
Accessing and Scrolling History Buffers
Details how to access and scroll through the history buffer for safety shutdowns.
UNIT CONTROL MODE AND SETPOINT DISPLAYS
Control Mode and Setpoint Displays
Explains displays for control mode, setpoints, and trip voltages.
UNIT STATUS AND OPERATING PARAMETER DISPLAYS
Evaporator Heater/Pump Status Displays
Details displays for evaporator heater and water pump status.
System Status and Software Version
Covers system status, software version, and control I/O information.
“ENTRY” KEYS FUNCTIONALITY
Overview of Entry Keys
Explains the UP, DOWN, and ENTER/ADV keys for viewing and changing programmed values.
“SETPOINTS” KEYS
Cooling Setpoints Programming
Instructions for programming cooling setpoints and range for leaving/return liquid control.
PROGRAMMING SETPOINTS AND SCHEDULES
Return Chilled Liquid Control Details
Explains return chilled liquid control and remote setpoints.
SCHEDULE/ADVANCE DAY KEY Usage
Details how to set the seven-day daily and holiday schedules.
TABLE 10 – COOLING SETPOINTS, PROGRAMMABLE LIMITS AND DEFAULTS
Setpoint Limits and Defaults Table
Provides limits and default values for cooling setpoints and temperature reset.
PROGRAM KEY OPERATION
Discharge, Suction, and Ambient Cutout Programming
Explains programming for discharge, suction, and low ambient cutouts.
Anti-Recycle Timer and Fan Control Programming
Details programming for anti-recycle timer and fan control on-pressure.
PROGRAM KEY PARAMETERS
Fan Differential Off Pressure and Compressor Count
Covers programming for fan differential off pressure and total compressor count.
System Trip Volts Calculation
Explains calculation and programming of system trip voltages.
PROGRAM KEY LIMITS AND DEFAULTS
TABLE 11 – PROGRAM KEY LIMITS AND DEFAULT VALUES
Table detailing programmable limits and default values for key parameters.
TABLE 12 – SETPOINTS QUICK REFERENCE LIST
Setpoints Quick Reference Chart
Provides a quick reference chart for setpoints accessible via the Setpoints keys.
“UNIT” KEYS FUNCTIONALITY
Options Key Navigation
Explains how to scroll through and change options using the OPTIONS key.
Option 1-4: Language, System Switches, Cooling Type, Ambient Control
Details programming for language, system switches, cooling type, and ambient control.
Option 5-8: Local/Remote, Unit Control, Display Units, Lead/Lag
Covers local/remote control, unit control mode, display units, and lead/lag type.
“UNIT” KEYS OPTIONS (CONTINUED)
Option 9-11: Fan Control, Override, and Current Feedback
Details options for condenser fan control, manual override, and current feedback.
Option 12-14: Power Fail Restart, Soft Start, Unit Type
Covers options for power fail restart, soft start, and unit type.
“UNIT” KEYS OPTIONS (CONTINUED)
Option 15-17: Refrigerant, Expansion Valve, Flash Card
Details options for refrigerant type, expansion valve type, and flash card updates.
Option 18: Remote Temperature Reset
Explains the selection for remote temperature reset input.
“UNIT” KEYS OPTIONS (CONTINUED)
Option 19-20: Pump Control and Selection
Details options for onboard or external pump control and selection.
CLOCK KEY Functionality
Explains how to display, set, and change the unit's date, time, and day.
TABLE 13 – UNIT KEYS OPTIONS PROGRAMMING QUICK REFERENCE LIST
Unit Keys Options Quick Reference Chart
Provides a quick reference for programming options using the Unit key.
SECTION 8 – UNIT OPERATION
CAPACITY CONTROL BASICS
Initiation of start sequence, pump control, and capacity control evaluation.
SUCTION PRESSURE LIMIT CONTROLS
Anticipatory controls to prevent low-pressure cutouts by limiting loading.
DISCHARGE PRESSURE LIMIT CONTROLS
Controls to unload system before safety limits are reached due to high load.
LEAVING CHILLED LIQUID CONTROL
Details setpoint control, cooling range, and compressor sequencing.
LEAVING CHILLED LIQUID CONTROL (CONTINUED)
LEAVING CHILLED LIQUID SYSTEM LEAD/LAG
Explains lead/lag options for equalizing run hours and compressor sequencing.
COMPRESSOR SEQUENCING LOGIC
Describes how compressors are sequenced within a system to prevent short cycling.
RETURN CHILLED LIQUID CONTROL
Return Chilled Liquid Control Operation
Details compressor staging based on load and temperature for return chilled liquid.
TABLE 14 – SAMPLE COMPRESSOR STAGING
Provides sample compressor staging for return water control.
RETURN CHILLED LIQUID CONTROL (CONTINUED)
TABLE 15 – RETURN CHILLED LIQUID CONTROL FOR 4 COMPRESSORS
Details return chilled liquid control steps for compressors.
RETURN CHILLED LIQUID SYSTEM LEAD/LAG
TABLE 16 – RETURN CHILLED LIQUID CONTROL FOR 4 COMPRESSORS
Provides lead/lag control steps for return chilled liquid.
ANTI-RECYCLE TIMER AND ANTI-COINCIDENCE TIMER
Anti-Recycle Timer Functionality
Ensures systems do not short cycle and allows motor heat dissipation.
Anti-Coincidence Timer Functionality
Prevents simultaneous system starts to avoid high starting current.
EVAPORATOR PUMP CONTROL AND CONDENSER FAN CONTROL
Evaporator Pump Control Logic
Details conditions for energizing evaporator pump dry contacts.
Standard Condenser Fan Control
Covers condenser fan control based on discharge pressure and programming.
LOAD LIMITING
Load Limiting Feature Explanation
Prevents unit from loading beyond desired value based on compressor count.
TABLE 19 – COMPRESSOR OPERATION – LOAD LIMITING
Table showing load limiting permissions based on compressor quantity.
BAS/EMS TEMPERATURE RESET
Temperature Reset via Voltage or Current Signal
Explains how to reset chilled liquid setpoint using analog signals.
SECTION 9 – SERVICE AND TROUBLESHOOTING
CLEARING HISTORY BUFFERS
Procedure for clearing the history buffers on the display panel.
SERVICE MODE ACCESS AND NAVIGATION
Details how to enter and navigate Service Mode.
SERVICE MODE – OUTPUTS AND CONFIGURATION
Lists outputs viewable/modifiable in Service Mode and chiller configuration settings.
SERVICE MODE – ANALOG & DIGITAL INPUTS
Describes how to view analog and digital inputs to the microboard.
CHECKING INPUTS AND OUTPUTS
TABLE 20 – I/O DIGITAL INPUTS
Lists digital input connections and their ON/OFF status.
TABLE 21 – I/O DIGITAL OUTPUTS
Lists digital output connections and their status.
TABLE 22 – I/O ANALOG INPUTS
Lists analog input connections for temperature and pressure sensors.
TABLE 23 – I/O ANALOG OUTPUTS
Lists analog output connections and their status.
MICROBOARD LAYOUT AND CONNECTIONS
FIG. 61 – MICROBOARD LAYOUT DIAGRAM
Diagram showing the layout of the microboard and its connectors.
CHECKING INPUTS AND OUTPUTS (CONTINUED)
Digital Inputs and Voltage Reference
Explains digital input connections and voltage measurements.
Analog Inputs – Temperature
Details analog inputs for temperature sensing and the outside air sensor.
TABLE 24 – OUTDOOR AIR SENSOR CORRELATION
Table correlating outdoor air temperature with voltage signal.
ENTERING/LEAVING CHILLED LIQUID SENSOR TEST POINTS
TABLE 25 – TEMPERATURE/VOLTAGE CORRELATION
Table correlating liquid temperatures with voltage signal inputs.
ANALOG INPUTS – PRESSURE
Pressure Input Connections and Formulas
Details pressure input connections and formulas for voltage output.
TABLE 26 – PRESSURE TRANSDUCERS
Table showing pressure vs. voltage correlation for transducers.
DIGITAL OUTPUTS AND I/O BOARD ARCHITECTURE
Digital Output Connections
Explains digital output connections on TB7, TB8, TB9, and TB10.
FIG. 62 – I/O BOARD RELAY CONTACT ARCHITECTURE
Diagram showing the I/O board relay contact architecture.
OPTIONAL PRINTER INSTALLATION
Required Parts for Printer Installation
Lists parts required for installing the optional printer.
Assembly and Wiring Procedures
Details assembly and wiring for the printer connection.
Obtaining a Printout
Explains how to obtain a printout using the keypad.
TROUBLESHOOTING
Panel Display and Operation Issues
Troubleshoots issues like no display or unit not operating.
Flow Switch/Remote Stop Permissive Faults
Addresses faults related to flow switch and remote stop permissive.
Low Suction Pressure Fault Troubleshooting
Troubleshoots low suction pressure faults, including charge and filter dryer.
TROUBLESHOOTING (CONTINUED)
Low Suction Pressure Fault Causes
Details causes for low suction pressure faults like TXV or flow issues.
High Discharge Pressure Fault Causes
Explains causes for high discharge pressure faults like fan or refrigerant issues.
Low Liquid Temperature Fault Causes
Addresses causes for low liquid temperature faults like setpoint or flow issues.
TROUBLESHOOTING (CONTINUED)
MP/HPCO Fault Causes
Troubleshoots MP/HPCO faults related to motor protector, overload, or switches.
Compressor Start and Cooling Effect Issues
Addresses issues with compressors not starting or lack of cooling effect.
SECTION 10 – MAINTENANCE
Important Maintenance Guidelines
Emphasizes owner responsibility and provides general maintenance guidance.
Compressor and Condenser Maintenance
Covers oil level checks, oil analysis, and condenser coil cleaning.
Operating Parameters and Battery Backup
Details checks for operating parameters and on-board battery backup.
Plate and Frame Heat Exchanger and Overall Inspection
Covers evaporator heater safety and overall unit inspection items.
MICROCHANNEL COIL CLEANING PROCEDURE
Coil Cleaning DO NOTs and Step-by-Step Guide
Details specific precautions and procedures for cleaning microchannel coils.
BACNET, MODBUS AND YORKTALK 2 COMMUNICATIONS
Communication Protocol Overview
Allows data reading/modification via serial communication protocols.
Parameter Setup Displays
Shows displays for modifying communication parameters like baud rate and parity.
MICROPANEL CONNECTIONS DIAGRAM
FIG. 64 – MICROPANEL CONNECTIONS DIAGRAM
Diagram showing the physical connections to the micropanel.
BAS COMMUNICATION SETUP REQUIREMENTS
TABLE 29 – VALUES REQUIRED FOR BAS COMMUNICATION
Table detailing setup requirements for BACnet, Modbus, and YorkTalk 2 protocols.
TABLE 30 – REAL TIME ERROR NUMBERS
Table listing real-time error numbers and their descriptions.
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