York YST - Page 6

JOHNSON CONTROLS
6
FORM 160.67-O2
ISSUE DATE: 10/9/2020
Fixed Speed Chiller Unloading Sequence ......................................................................................................39
PRV Control .......................................................................................................................................... 39
Hot Gas Ratio Control ...........................................................................................................................39
HGV Temperature Controller ................................................................................................................. 39
Fixed Speed Chiller Override Controllers ....................................................................................................... 39
High and Low Refrigerant Pressure ......................................................................................................39
Turbine Governor Position Power Limiting ............................................................................................ 39
Turbine Horsepower Limiting.................................................................................................................40
Variable Speed Chiller Capacity Controls Operation ......................................................................................40
Variable Speed Chiller Loading Sequence .................................................................................................... 41
Hot Gas Mode .......................................................................................................................................41
PRV Mode ............................................................................................................................................. 41
Speed Mode ..........................................................................................................................................41
Variable Speed Chiller Unloading Sequence .................................................................................................41
Speed Mode ..........................................................................................................................................41
PRV Mode ............................................................................................................................................. 42
Hot Gas Mode .......................................................................................................................................42
Variable Speed Chiller Override Controllers ...................................................................................................42
High and Low Refrigerant Pressure ......................................................................................................42
Turbine Governor Position Power Limiting ............................................................................................ 42
Turbine Horsepower Limiting.................................................................................................................43
Operating Log Sheet ......................................................................................................................................43
Operating Inspections ....................................................................................................................................44
Daily ......................................................................................................................................................44
Ring Oil Lubrication ...............................................................................................................................45
Pressure Lubrication .............................................................................................................................45
Weekly ................................................................................................................................................... 45
Monthly .................................................................................................................................................. 45
Quarterly ................................................................................................................................................45
Semi-Annually (or more often as required) ...........................................................................................46
Annually (more often if necessary) ........................................................................................................ 46
3 Year ....................................................................................................................................................46
Need For Maintenance Or Service ................................................................................................................. 46
System Shutdown ..........................................................................................................................................47
Prolonged Shutdown ......................................................................................................................................47
Turbine O󰀨-Season Storage ..................................................................................................................47
Turbine Steam Path .............................................................................................................................47
Turbine Lubrication System ...................................................................................................................48
Other Recommendations ......................................................................................................................48
Steam Condenser O󰀨-Season Storage ................................................................................................48
SECTION 3 - SYSTEM COMPONENTS DESCRIPTION ................................................................................... 49
General ...........................................................................................................................................................50
Compressor Variable Geometry Diffuser (VGD) .............................................................................................50
Compressor Lubrication System ....................................................................................................................50
Compressor Oil Pump ....................................................................................................................................52
Compressor OIL HEATER .............................................................................................................................. 52
Steam Turbine ...............................................................................................................................................52
Steam Turbine Inlet Valves .............................................................................................................................53
Turbine Bearings ............................................................................................................................................53
TABLE OF CONTENTS (CONT'D)