York MILLENIUM YCAS Series, Installation Operation & Maintenance, Page: 4 / 156

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YORK INTERNATIONAL
TABLE OF CONTENTS (CONT’D)
SECTION 8 MICRO PANEL CONTENTS ........................................................................................... 97
Chiller Control Panel Programming and Data Access Keys ................................................... 97
Display and Status Information Keys ....................................................................................... 97
ON / OFF Rocker Switch .......................................................................................................... 97
Program & Setup Keys ............................................................................................................. 97
1. INTRODUCTION & PHYSICAL DESCRIPTION ................................................................................. 98
1.1 General ..................................................................................................................... 98
1.2 Keypad & Display ................................................................................................... 98
1.3 Unit (Chiller) On / OFF Switch ................................................................................ 99
1.4 Microprocessor Board ............................................................................................ 99
1.5 Ancillary Circuit Boards .......................................................................................... 99
1.6 Circuit Breakers ...................................................................................................... 100
1.7 Current Transformers (C.T.) ................................................................................... 100
1.8 Transformers .......................................................................................................... 100
1.9 Motor Protection Modules .................................................................................... 101
1.10 EMS/BAS Controls ................................................................................................ 103
1.11 Microprocessor Board Layout ............................................................................... 105
1.12 Logic Section Layout ............................................................................................. 106
1.13 Anti-Recycle Timer ................................................................................................ 107
1.14 Anti-Coincidence Timer .........................................................................................107
1.15 Evaporator Pump Control .......................................................................................107
1.16 Compressor Heater Control .................................................................................... 107
1.17 Evaporator Heater Control .....................................................................................107
1.18 Pumpdown (LLSV) Control .................................................................................... 107
1.19 Alarms ....................................................................................................................107
1.20 Run Status (Chiller) ................................................................................................ 108
1.21 Lead / Lag Compressor Selection ........................................................................... 108
2. STATUS KEY: GENERAL STATUS MESSAGES AND FAULT WARNINGS ...................................... 109
2.1 General ....................................................................................................................109
2.2 General Status Messages .......................................................................................109
2.3 Unit Warnings ........................................................................................................ 110
2.4 Anticipation Control Status Messages ..................................................................111
2.5 Unit Fault Status Messages ................................................................................... 112
2.6 System Fault (Safety) Status Messages ................................................................113
2.7 Printout on Fault Shutdown ................................................................................... 116
3. DISPLAY KEYS & OPTION SWITCHES ............................................................................................ 117
3.1 General ....................................................................................................................117
3.2 Chilled Liquid Temps Key ......................................................................................117
3.3 System # Data Keys ............................................................................................... 118
3.4 Ambient Temp Key ................................................................................................ 118
3.5 Motor Current Key ................................................................................................. 119
3.6 Operating HRS / Start Counter Key ....................................................................... 119
3.7 Options Key & Dip Switch Settings ...................................................................... 119
3.8 Function Key ......................................................................................................... 121
4. PRINT KEYS ....................................................................................................................................... 122
4.1 General ....................................................................................................................122
4.2 Oper Data Key ........................................................................................................ 122
4.3 Operating Data – Local Display Messages ............................................................ 122
4.4 Operating Data – Remote Printout ......................................................................... 123
4.5 History Key ............................................................................................................ 125
4.6 Fault History Data – Local Display Messages ...................................................... 125
4.7 Fault History Data – Remote Printout ....................................................................128