Name: York YVAA Style A
Brand: York
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Air-Cooled Screw Liquid Chillers

Installation, Operation, Maintenance

Supersedes: 201.28-NM1.1 (321) Form 201.28-NM1.1 (821)

HFC-134A or R-513A

525 kW to 1750 kW

2 Compressor

50 Hz and 60 Hz

Model YVAA Style A

Air-Cooled Screw Liquid Chillers with Variable Speed Drive

Frame Sizes 015 – 052

150 ton to 500 ton

035-23219-100

Issue Date:

August 6, 2021

Default Chapter5
- Table of Contents5
Section 1 - General Chiller Information and Safety11
- Introduction11
- Warranty11
- Quality Assurance and Safety12
- Fluorinated Greenhouse Gases12
- Responsibility for Safety12
- About this Manual12
- Misuse of Equipment12
Figure 1 - YVAA Air-Cooled Screw Liquid Chiller with Variable Speed Drives15
Section 2 - Product Description15
- General System Description15
- Condenser17
- Electrical17
- Evaporator17
- Refrigerant Circuit17
- Semi-Hermetic YORK Twin-Screw Compressors17
- Building Automation System Capabilities18
- Microcomputer Control Center18
Section 3 - Rigging, Handling, and Storage23
- Lifting Weights23
- Delivery and Storage23
- Inspection24
- Moving the Chiller24
- Unit Removal from Shipping Container24
- Lifting Using Lugs24
- Lifting Using Shackles24
Figure 4 - Lifting Using Lugs24
Table 1 - Unit Rigging26
Section 4 - Installation35
- Location Clearances35
- Location Requirements35
- Outdoor Installations35
- Table 2 - Minimum Evaporator Tube Removal Clearance36
- Figure 5 - Acceptable Minimum Clearances Around and between Units36
- Chilled Liquid Piping37
- Shipping Braces37
- Vibration Isolators37
- Evaporator Pressure Drop38
- Leaving Water Temperature out of Range40
- Minimum Water Volume40
- Pipework Arrangement40
- Water Treatment40
- Figure 11 - Suggested Layout for Applications with a Flow Rate Greater than the Evaporator Maximum41
- Figure 10 - Suggested Layout for Applications with a Flow Rate Less than the Evaporator Minimum41
- Table 3 - Evaporator Connections Dimensions42
- Electrical Connection43
- Refrigerant Relief Valve Piping43
Figure 18 - Thermal Dispersion Flow Switch Connections49
Figure 19 - Reserved Customer Wiring Entry50
Figure 20 - Water Box Heater Wiring Box50
Table 4 - Electrical Lug Data52
Section 5 - Technical Data63
- Table 5 - Physical Data - Microchannel Coil64
- Table 6 - Physical Data - Round Tube Coil68
- Table 7 - Optional One-Pass Evaporator70
- Table 8 - Standard Two-Pass, Rear Inlet/Outlet Evaporator74
- Table 9 - Optional Three-Pass Rear Inlet/Front Outlet Evaporator78
- Figure 21 - YVAA Dimensions82
- Table 10 - Isolator Selection and Mounting Locations84
- Elastomeric Isolator Installation90
- Elastomeric Isolator Specifications91
- One Inch Deflection Isolator Installation92
- One Inch Deflection Spring Isolator Specifications93
- Two Inch Deflection Isolator Installation and Adjustment94
- Two Inch Deflection, Restrained Spring Isolator Specifications95
Section 6 - Commissioning97
- Preparation97
- Figure 22 - LED Indicator Buttons98
- Figure 24 - Flow below the Representation Range99
- Figure 23 - Flow Switch Set99
- Figure 25 - Flow Exceeds the Representation Range99
- First Time Startup100
- General Operation100
Table 11 - Freeze Damage Protection Requirements101
Section 7 - Operation103
- Figure 26 - Keyboard and Display103
- Operating Controls103
- Basic Operating Sequence105
- Microboard (331-03478-XXX)106
- Unit Warning106
- Table 12 - Values Required for BAS Communication111
- Table 13 - Real Time Error Numbers for BAS, SC-EQ or E-Link Communications Card112
- Figure 28 - LON E-Link Gateway Option113
- SC-EQ or E-Link BAS Communications Card113
- Data Logging123
- Program Update123
Table 18 - Low Differential Oil Pressure Cutout128
Table 19 - Discharge Pressure Load Limiting/Unloading129
Table 20 - Suction Pressure Load Limiting/Unloading129
Table 21 - Start Inhibit Sensor Thresholds130
Section 8 - Micropanel131
- Unit Data Key134
- System Data Keys 1 through 4136
- VSD Data Key139
Section 9 - Maintenance165
- General Requirements165
- Refrigerant Removal, Evacuation and Charging a YVAA Chiller166
- Microchannel Coil Cleaning167
- Thermal Dispersion Flow Switch168
- Table 27 - Troubleshooting Guide169
- Maintenance Requirements for YVAA Chillers170
  - Table 28 - R-134A Pressure to Saturated Temperature Conversion172
  - R-513A Conversion Table175
- R-134A Conversion Table174
Table 32 - Outside Air Temperature Sensor Input Voltage (Measured Signal to Shield at the Sensor)176
Table 33 - Pressure Transducer Output Voltage (Measured Signal to Return at the Transducer)177
Table 34 - Motor Temperature Sensor Resistance (Check at the Motor)178
Section 10 - Decommissioning, Dismantling, and Disposal181
- Table 35 - si Metric Conversion181
- Temperature182
- Notes183

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York YVAA Style A Specifications

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Brand	York
Model	YVAA Style A
Category	Chiller
Language	English

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York YVAA Style A Specifications

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