York YST - SYSTEM DESCRIPTION AND OPERATION; General System Description; Refrigeration System Operation

JOHNSON CONTROLS
9
FORM 160.67-O2
ISSUE DATE: 10/9/2020
LIST OF FIGURES
FIGURE 1 - Model YST Chiller .............................................................................................................................. 11
FIGURE 2 - Compressor Prerotation Vanes ........................................................................................................... 12
FIGURE 3 - Refrigerant Flow - Thru .......................................................................................................................14
FIGURE 4 - Steam And Condensate Flow ............................................................................................................16
FIGURE 5 - Steam Condenser Hotwell Level Switches .........................................................................................17
FIGURE 6 - Slow Roll Time calculation ..................................................................................................................27
FIGURE 7 - Operation Sequence Timing Diagram (Manual Start) ........................................................................29
FIGURE 8 - Operation Sequence Timing Diagram (Automatic Start) ..................................................................... 30
FIGURE 9 - Liquid Chiller Log Sheets ....................................................................................................................44
FIGURE 10 - System Components .........................................................................................................................49
FIGURE 11 - Schematic Drawing – (YST) Compressor Lubrication System ..........................................................51
FIGURE 12 - KD & KG Turbine Drawing ................................................................................................................54
FIGURE 13 - Overspeed Protection Knob Assembly .............................................................................................60
FIGURE 14 - Oil Return System ............................................................................................................................. 63
FIGURE 15 - Charging Oil Reservoir With Oil ........................................................................................................64
FIGURE 16 - Standard Single Oil Filter And Optional Dual Oil Filter ......................................................................65
FIGURE 17 - Dual Oil Filter Isolation Valve ............................................................................................................66
FIGURE 18 - Evacuation Of Chiller ........................................................................................................................73
FIGURE 19 - Saturation Curve ...............................................................................................................................75
LIST OF TABLES
TABLE 1 - Recommended Maximum Turbine Bearing, Oil Sump, And Metal Temperatures .................................66
TABLE 2 - Refrigerant Charge Level ...................................................................................................................... 68
TABLE 3 - Operation Analysis Chart ......................................................................................................................71
TABLE 4 - System Pressures .................................................................................................................................73
TABLE 5 - Turbine Tightening Torques (Without Washers) ....................................................................................80
TABLE 6 - Turbine Tightening Torques (With Washers) .........................................................................................80
TABLE 7 - Recommended Limits For Boiler Water (Based On Drum Water Analyses). ........................................87
TABLE 8 - SI Metric Conversion .............................................................................................................................88