YORK Model YS Rotary Screw Liquid Chillers Style D R134a

Introduction
York YS chillers are manufactured to the highest design and construction standards to ensure high performance, reliability and adaptability to all types of air conditioning installations.
The units are intended for cooling water or glycol solutions and are not suitable for purposes other than those specified in this manual.
This manual and the Control System Operating Instructions contain all the information required for correct installation and commissioning of the unit, together with operating and maintenance instructions.
The manuals should be read thoroughly before attempting to operate or service the unit.
All procedures detailed in the manuals, including installation, commissioning and maintenance tasks must only be performed by suitably trained and qualified personnel.
The manufacturer will not be liable for any injury or damage caused by incorrect installation, commissioning, operation or maintenance resulting from a failure to follow the procedures and instructions detailed in the manuals.


1 SUPPLIER INFORMATION
1.1 Introduction
1.2 Warranty
1.3 Safety
1.4 Responsibility for Safety
1.5 About this Manual
1.6 Misuse of Equipment
1.7 Safety Labels
1.8 Material Safety Data
2 Product Description
2.1 General
2.2 Capacity Control
2.3 Compressor
2.4 Compressor Lubrication System
2.4.1 Oil Pump
2.4.2 Oil Heater
2.5 Compress Motor
2.6 Graphic Control Centre
2.7 Heat Exchangers
2.7.1 Evaporator
2.7.2 Condenser
2.7.3 Water Boxes
2.8 Refrigerant Flow Control
2.9 Options and Accessories
2.9.1 Service Isolation Valves
2.9.2 Hot Gas Bypass
2.9.3 Solid State Starter
2.9.4 Variable Speed Drive
2.10 Nomenclature
2.11 Range of Models
3 TRANSPORTATION, RIGGING AND
STORAGE
3.1 General
3.2 Shipment
3.3 Inspection, Damage and Shortage
3.4 Rigging
4 INSTALLATION
4.1 Location
4.2 Motors
4.3 Foundation
4.4 Clearances
4.5 Rigging Unit to Final Location
4.6 Locating and Installing Isolator Pads
4.7 Installing Optional Spring Isolators
4.8 Piping Connections
4.9 Cooler and Condenser Water Piping
4.9.1 Condenser Water Circuit
4.10 Stop Valves
4.11 Flow Switches (Field Installed)
4.12 Drain and Vent Valves
4.13 Checking Piping Circuits and Venting Air
4.14 Refrigerant Relief Piping
4.15 Unit Piping
4.16 Control Panel Positioning
4.17 Control Wiring
4.18 Power Wiring
4.19 Units with Solid State Starter
or Variable Speed Drive
4.20 Thermal Insulation
4.21 Installation Check
5 COMMISSIONING
5.1 Preparation
6 OPERATION
6.1 Oil Heater Operation
6.2 Checking the Oil Level in the Oil Reservoir
6.3 Start-up Procedure
6.3.1 Pre-Starting
6.3.2 Start-up
6.4 Chiller Operation
6.4.1 Condenser Water Temperature Control
6.5 Operating Log Sheet
6.6 Maintenance and Service
6.6.1 Normal and Safety System Shutdowns
6.6.2 Safety Shutdowns
6.6.3 Cycling Shutdowns
6.7 Stopping the System
6.8 Prolonged Shutdown
6.9 Start-up after Prolonged Shutdown
7 MAINTENANCE
7.1 Inspections
7.1.1 Daily
7.1.2 Weekly
7.1.3 Every 3 Months
7.1.4 Every 6 Months (or more often as required)
7.1.5 Annually (more often if necessary)
7.2 Oil Return System
7.2.1 Changing the Dehydrator
7.3 Oil Charge
7.3.1 Oil Charging Procedure
7.4 Refrigerant Charge
7.4.1 Checking The Refrigerant Charge
7.4.2 Leak Testing
7.4.3 Vacuum Testing
7.4.4 Refrigerant Charging
7.5 Condenser and Cooler
7.5.1 Chemical Water Treatment
7.5.2 Tube Cleaning
7.5.3 Tube Cleaning Procedures
7.5.4 Tube Leaks
7.6 Compressor
7.7 Compressor Motor
7.7.1 Greased Bearings on Reliance Q5800 Motors
7.8 Electrical Controls
7.9 Testing Motor Winding Insulation
8 TROUBLE SHOOTING
9 TECHNICAL DATA
9.1 Dimensions
9.2 Weights
9.3 Compressor Dimensions
9.4 Motor Weights
9.5 Optional Solid State Starter Details
9.6 Process and Instrumentation Diagram
9.7 Water Box Nozzle Arrangements
10 SPARE PARTS
11 DE-COMMISSIONING, DISMANTLING AND
DISPOSAL
11.1 General
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RCUE40AG2-400AG2 RHUE40AG2-240AG2 Service Manual

RCUE40AG2-400AG2
RHUE40AG2-240AG2
Cooling capacity 112 kW - 1030 kW
Cooling capacity 106 kW - 585 kW
Heating capacity 110 kW - 556 kW

Content
1. Product range and specifi cations
1.1. General data for RCUE40~400AG2
1.2. General data for RHUE40~240AG2
2. Test run
2.1. Check before test run
2.2. Test run method and check
2.3. Restart of Test Run
2.4. Instruction at delivery
2.5.Warning & Cautions
3 Electrical Wiring Diagram
3.1. Power Wiring Diagram
3.2. Power Wiring Diagram (FAN)
3.3. Control PCB (PCBc)
3.4. Input / Output PCB (PCBd)
3.5. Power Wiring Diagram (MCB Option)
3.6. Diagram abbreviations descriptions
4. Control system
4.1. List of Main Control Function
4.2. Water control
4.3. Compressor control
4.4. Current limit control
4.5. Reverse protection control
4.6. Restart control after power failure
4.7. Operation error/wrong setting prevention control [40 – 40]
4.8. Forced capacity control
4.9. Second water temperature setting
4.10. Heat storage operation by external order
4.11. Operation by DC24V input (Remote Control)
4.12. Installation of switch for snow measure (Fan manual operation)
4.13. Switch for confi rmation of high pressure cut
4.14 Antifreeze control in winter
4.15. Saving energy priority mode, silence priority mode (night shift), only cooling
4.16. Defrost (only air-cooled heat pump type)
4.17. Thermo off selection function
5. Troubleshooting
5.1. Initial check
5.2. Troubleshooting
5.3. Analysis and countermeasure of abnormal running
5.4. Thermistor characteristics
6. Maintenance
6.1. Maintenance criteria
6.2. Maintenance criteria of Screw Compressor
6.3. Maintenance of Water Quality
6.4. Cleaning of water side heat exchanger
6.5. Check items in daily operation
6.6. Caution on handling of R407C
6.7. Manual at compressor overall check and parts check
6.8. Refrigerant cycle diagrams
6.9. Overhaul work
6.10. Vacuuming Procedure
6.11. Additional refrigerant insertion
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