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JOHNSON CONTROLS

SECTION 2 – PRODUCT DESCRIPTION

Form 150.63-NM9

Issue date: 5/20/2021

LD04284A

Refrigerant flow diagram

Figure 5 - Refrigerant Flow Diagram

2 OR 3 COMPRESSORS PER SYSTEM

OIL EQUALIZING

LINE

AIR COOLED CONDENSERS

SERVICE VALVE

OPTIONAL DISCHARGE

PRESSURE TRANSDUCER

HIGH PRESSURE

CUTOUT SWITCH

LOW PRESSURE SWITCH OR

SUCTION PRESSURE TRANSDUCER

LIQUID LINE

SERVICE VALVE

LIQUID LINE

SOLENOID VALVE

** TXV

SIGHT GLASS /

MOISTURE INDICATOR

SOLENOID OPERATED

HOT GAS BYPASS VALVE

YCUL REFRIGERANT FLOW DIAGRAM

NOTE: YCUL0046-0090 HAVE TWO REFRIGERANT SYSTEMS

* HOT GAS OPTION - SYSTEM 1 ONLY

LIQUID LINE

FILTER DRIER

EVAP.

AIR FLOW

DISCHARGE AIR

TEMPERATURE SENSOR

OPTIONAL SUCTION

TEMP SENSOR

FACTORY PIPING

FIELD PIPING

**One TXV and Liquid Line Solenoid shown for illustration purposes. Actual refrigerant piping may vary depending on evaporator circuiting.

(OPTIONAL)

SERVICE

VALVE

(OPTIONAL)

YCUL

YCUL0045-0072

DX COIL

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

Brand	York
Model	YCUL0055EE
Category	Heat Pump
Language	English

York YCUL0055EE User Manual

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