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5000 Renaissance Drive, New Freedom, Pennsylvania USA 17349 1-800-524-1330 Subject to change without notice. Printed in USA

Form 150.63-NM9 (521)

Issue Date: May 20, 2021

Supersedes: 150.63-NM9 (1220)

Main Page

Default Chapter5
- Table of Contents5
Section 1 - General Equipment Information and Safety11
- Compressors11
- Condenser11
- Introduction11
- Refrigerant Circuit11
- Warranty11
- About this Manual12
- Misuse of Equipment12
- Safety and Quality12
- FIGURE 1 - YCUL Air-Cooled Scroll Compressor Condensing Unit15
- Microcomputer Control Center16
- Building Automation System Interface17
- Communications17
- Power Panel17
- Discharge Pressure Transducers and Readout Capability18
Section 2 - Product Description15
- General System Description15
- Introduction15
- FIGURE 2 - Unit Components Front20
- FIGURE 3 - Control/Power Panel Components Single System Units21
- FIGURE 4 - Control/Power Panel Components Dual System Units22
- Basic Unit23
FIGURE 5 - Refrigerant Flow Diagram27
FIGURE 6 - Process and Instrumentation Diagram28
FIGURE 7 - Unit Rigging29
Section 3 - Handling and Storage29
- Delivery and Storage29
- Inspection29
- Unit Rigging29
Section 4 - Installation31
- Handling31
- Installation Checklist31
- Location and Clearances31
- Compressor Mounting32
- Ductwork Connection32
- Pipework Arrangement32
- Recommendations of the Building Services Research Association32
- Spring Isolators (Optional)32
- Wiring32
- FIGURE 8 - Wiring Options for Remotely Start or Stop the Dual System Unit33
- Compressor Heaters34
- High Pressure Cutout34
- Refrigerant Piping34
- Relief Valves34
- TABLE 2 - Refrigerant Piping Charges35
- TABLE 1 - Fitting Equivalent Lengths35
- TABLE 4 - Refrigerant Line Connections36
- TABLE 3 - Miscellaneous Liquid Line Pressure Drops36
- Filter Driers / Sight Glasses / Txvs37
- Oil Traps37
- Refrigerant Charge37
- Refrigerant Piping Reference37
FIGURE 9 - Single-Point Supply Connection - Terminal Block, Non-Fused Disconnect Switch38
FIGURE 10 - Discharge Air Sensor Field Wiring38
FIGURE 11 - Control Wiring39
Section 5 - Technical Data41
- Operational Limitations (English)41
  - TABLE 5 - Voltage Limitations41
  - Physical Data (SI)43
- Physical Data (English)42
- TABLE 9 - Voltage Range44
- TABLE 8 - Micro Panel Power Supply44
- TABLE 10 - Lug Ranges48
- Electrical Notes and Legend49
- FIGURE 12 - Control Wiring Diagram, Single Circuit, IPU II52
- Wiring Diagrams52
  - FIGURE 13 - Control Wiring Diagram, Single Circuit, IPU II55
  - Weight Distribution and Isolator Mounting Positions93
- Dimensions (English)88
- Clearances92
FIGURE 39 - Installation of Durulene Vibration Isolators101
Section 6 - Commissioning103
- Preparation - Power off103
- Preparation - Power on104
- Equipment Pre-Startup and Startup Checklist105
Section 7 - Unit Controls109
- Introduction109
- Microprocessor Board109
- Unit Switch110
- Display110
- Keypad110
- Battery Back-Up110
- Transformer110
- Single System Select and Programming # of Compressors110
TABLE 11 - Status Key Messages Quick Reference List116
TABLE 12 - Operation Data120
TABLE 13 - Cooling Setpoints Programmable Limits and Defaults131
TABLE 14 - Program Key Limits and Defaults131
TABLE 15 - Setpoints Quick Reference List132
TABLE 16 - Options Key Programming Quick Reference List138
Section 8 - Unit Operation139
- Capacity Control139
- Discharge Air Temperature Control139
- Discharge Pressure Limit Controls139
- Suction Pressure Limit Controls139
- Suction Pressure Control141
- TABLE 19 - YCUL0020 - YCUL0072 Condenser Fan Control Using Outdoor Ambient Temperature and Discharge Pressure143
- Alarm Status145
- Compressor Run Status145
- Load Limiting145
Section 9 - Service and Troubleshooting147
- Clearing History Buffers147
- Service Mode147
- Service Mode - Outputs147
- Service Mode - Analog and Digital Inputs148
- Service Mode - Condensing Unit Configuration148
- Control Inputs/Outputs149
- TABLE 27 - I/O Analog Outputs149
- TABLE 26 - I/O Analog Inputs149
- TABLE 25 - I/O Digital Outputs149
- TABLE 24 - I/O Digital Inputs149
- FIGURE 43 - Microboard Layout150
- Checking Inputs and Outputs151
TABLE 28 - Outdoor Air Sensor Temperature/Voltage/Correlation151
TABLE 29 - Discharge Air Temp. Sensor Temperature/Voltage/Resistance Correlation152
TABLE 30 - Pressure Transducers153
FIGURE 44 - I/O Board Relay Contact Architecture154
FIGURE 45 - Printer to Microboard Electrical Connections155
TABLE 31 - Troubleshooting157
Section 10 - Maintenance159
- Important159
- Compressors159
- Condenser Fan Motors159
- Condenser Coils159
- Operating Parameters159
- Onboard Battery Back-Up159
- Overall Unit Inspection159
- Bacnet, Modbus, and Yorktalk 2 Communications160
TABLE 32 - Minimum, Maximum, and Default Values161
FIGURE 46 - Micro Panel Connections161
TABLE 33 - Values Required for Bas Communication162
TABLE 34 - Real Time Error Numbers162
TABLE 35 - Bacnet and Modbus Communications Data Map164
TABLE 36 - Yorktalk 2 Communications Data Map168

York YCUL0055EE - Page 178

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