Name: York YLUA0078
Brand: York
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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 150.73-NM1 (920)

Issue Date: September 4, 2020

Supersedes: 150.73-NM1 (918)

Table of Contents5
Section 1 - General Equipment Information and Safety11
Introduction11
Compressors11
Condenser11
Refrigerant Circuit11
Warranty11
Safety and Quality12
About this Manual12
Misuse of Equipment13
Section 2 - Product Description15
Introduction15
General System Description15
FIGURE 1 - Compressors15
Refrigerant Circuit16
Microcomputer Control Center16
High Ambient Kit17
Communications17
Power Panel17
Accessories and Options17
Unit Components20
FIGURE 2 - Unit Components Front20
FIGURE 3 - Power Panel Components21
FIGURE 4 - Power Panel / Control Components22
Nomenclature (Pin)23
Basic Unit23
Refrigerant Flow Diagram27
FIGURE 5 - Refrigerant Flow Diagram27
Process and Instrumentation Diagram28
FIGURE 6 - Process and Instrumentation Diagram28
Section 3 - Handling and Storage29
Delivery and Storage29
Inspection29
Unit Rigging29
FIGURE 7 - Unit Rigging29
Section 4 - Installation31
Installation Checklist31
Handling31
Location and Clearances31
Spring Isolators (Optional)32
Compressor Mounting32
Pipework Arrangement32
Ductwork Connection32
Wiring32
Compressor Heaters33
Relief Valves33
High Pressure Cutout33
Electrical Wiring33
Compressor Heaters35
Refrigerant Piping35
TABLE 1 - Fitting Equivalent Lengths36
TABLE 2 - Refrigerant Piping Charges36
TABLE 3 - Miscellaneous Liquid Line Pressure Drops36
TABLE 4 - Refrigerant Line Connections37
Oil Traps38
Refrigerant Charge38
Filter Driers/ Sight Glasses/Txv's38
Refrigerant Piping Notes39
TABLE 5 - Refrigerant Line Pressure Drops (English)39
FIGURE 8 - Single-Point Supply Connection - Terminal Block, Non-Fused Disconnect Switch40
FIGURE 9 - Discharge Air Sensor Field Wiring40
Control Wiring41
FIGURE 10 - Control Wiring41
Section 5 - Technical Data43
Operational Limitations (English)43
TABLE 6 - Voltage Limitations43
Physical Data (English)44
TABLE 7 - Physical Data (English)44
TABLE 8 - Micro Panel Power Supply45
TABLE 9 - Voltage Range45
TABLE 10 - Standard Efficiency Unit Electrical Data (4 Compr)46
TABLE 11 - Standard Efficiency Unit Electrical Data (5 Compr)46
TABLE 12 - Standard Efficiency Unit Electrical Data (6 Compr)48
TABLE 13 - High Efficiency Unit Electrical Data (4 Compr)48
TABLE 14 - High Efficiency Unit Electrical Data (5 Compr)48
TABLE 15 - Standard Efficiency Unit Electrical Data (4 Compr)50
TABLE 16 - Standard Efficiency Unit Electrical Data (5 Compr)50
TABLE 17 - Standard Efficiency Unit Electrical Data (6 Compr)52
TABLE 18 - High Efficiency Unit Electrical Data (4 Compr)52
TABLE 19 - High Efficiency Unit Electrical Data (5 Compr)52
TABLE 20 - Lug Sizing54
Wiring Diagrams60
FIGURE 11 - Elementary Wiring Diagram60
FIGURE 12 - Power Options Connection Diagram70
FIGURE 13 - Single Point and Dual Point Wiring74
FIGURE 14 - Wiring76
FIGURE 15 - Micro Panel Connections78
FIGURE 16 - Elementary Diagram80
Dimensions (English)84
Clearances87
FIGURE 17 - Unit Clearances - All Models87
Weight Distribution and Isolator Mounting Positions88
FIGURE 18 - Sample Printout Supplied in the Isolator Package and in the Chiller Panel Literature Packet88
Isolator Information89
Section 6 - Commissioning95
Commissioning95
Preparation - Power off95
Preparation - Power on96
Section 7 - Unit Controls101
Introduction101
Microprocessor Board101
Unit Switch102
Display102
Keypad102
Battery Back-Up102
Transformer102
Single System Select and Programming Number of Compressors102
Status Key103
FIGURE 19 - Status Key Messages Quick Reference List107
Display/Print Keys108
FIGURE 20 - Operation Data111
Entry Keys116
Setpoints Keys117
TABLE 21 - Cooling Setpoints Programmable Limits and Defaults122
TABLE 22 - Program and Defaults122
FIGURE 21 - Setpoints Quick Reference List123
Unit Keys124
FIGURE 22 - Unit Keys Programming Quick Reference List129
Section 8 - Unit Operation131
Capacity Control131
Suction Pressure Limit Controls131
Discharge Pressure Limit Controls131
Discharge Air Temperature Control131
FIGURE 23 - Discharge Air Temperature Control132
TABLE 23 - Discharge Air Temperature Control for 5 and 6 Compressors (7 and 8 Steps)132
TABLE 24 - Discharge Air Temperature Control for 4 Compressors (6 Steps)132
Suction Pressure Control133
FIGURE 24 - Suction Pressure Control133
System Lead/Lag134
Compressor Lead/Lag134
Anti-Recycle Timer134
Anti-Coincidence Timer134
Evaporator Blower Control134
Pumpdown Control134
FIGURE 25 - YLUA0078 - YLUA0095 Fan Location (Typical)135
TABLE 25 - YLUA0078 - YLUA0095 Condenser Fan Control Using Outdoor Ambient Temperature and Discharge Pressure135
TABLE 26 - YLUA0078 - YLUA0095 Condenser Fan Control Using Discharge Pressure Only135
TABLE 27 - YLUA0078 - YLUA0095 Low Ambient Condenser Fan Control - Discharge Pressure Control136
Condenser Fan Control137
FIGURE 26 - YLUA0098 - YLUA0130 Fan Location137
TABLE 28 - YLUA0098 - YLUA0130 Condenser Fan Control137
FIGURE 27 - YLUA0148 - YLUA0158 Fan Location138
TABLE 29 - YLUA0148 - YLUA0158 Condenser Fan Control138
Load Limiting139
Compressor Run Status139
Alarm Status139
TABLE 30 - Compressor Operation - Load Limiting139
BAS/EMS Discharge Air Temperature Reset Using a Voltage or Current Signal140
Section 9 - Service and Troubleshooting141
Clearing History Buffers141
Service Mode - Outputs141
Service Mode - Condensing Unit Configuration141
Service Mode - Analog and Digital Inputs142
Control Inputs/Outputs143
TABLE 31 - I/O Digital Inputs143
TABLE 32 - I/O Digital Outputs143
TABLE 33 - I/O Analog Inputs143
TABLE 34 - I/O Analog Outputs143
FIGURE 28 - Microboard Layout144
Checking Inputs and Outputs145
TABLE 35 - Outdoor Air Sensor Temperature/Voltage/Correlation145
TABLE 36 - Discharge Air Temperature Sensor Temperature/Voltage/Resistance Correlation146
TABLE 37 - Pressure Transducers147
FIGURE 29 - I/O Board Relay Contact Architecture148
Optional Printer Installation149
FIGURE 30 - Printer to Microboard Electrical Connections149
TABLE 38 - Troubleshooting150
Section 10 - Maintenance153
Important153
Compressors153
Condenser Fan Motors153
Condenser Coils153
Operating Parameters153
On-Board Battery Back-Up153
Overall Unit Inspection153
ISN Control154
TABLE 39 - ISN Received Data154
TABLE 40 - ISN Transmitted Data154
TABLE 41 - ISN Operational and Fault Codes156
Bacnet and Modbus Data Communication157
TABLE 42 - Minimum, Maximum and Default Values158
TABLE 43 - Real Time Error Numbers158
TABLE 44 - Serial Communication Analog Value Data159
TABLE 45 - Serial Communication Binary Value Data159
TABLE 46 - Serial Communication Analog Input Data159
TABLE 47 - Serial Communication Binary Input Data161
TABLE 48 - Temperature Conversion Chart - Actual Temperature162
TABLE 49 - Temperature Conversion Chart Differential Temperatures162
TABLE 50 - Pressure Conversion Chart - Gauge or Differential163
TABLE 51 - R-410A Pressure Temperature Chart163

York YLUA0078 User Manual

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York YLUA0078 Specifications

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Brand	York
Model	YLUA0078
Category	Heat Pump
Language	English