York Millennium YCAS Series Installation Operation & Maintenance page 4

Compressor Components ....................................... 118
System Startup Checklist ..................................... 124
Unit Checks ............................................................ 124
Panel Checks ........................................................... 125
Initial Start-up ....................................................... 126
Checking Subcooling and Superheat ................... 126
Checking Economizer Superheat ......................... 127
Leak Checking ..................................................... 127
8
SECTION MICROPANEL CONTENTS .......................................................................................... 128
Chiller Control Panel Programming and Data Access Keys ................................................. 128
Display and Status Information Keys ....................................................................................... 128
ON / OFF Rocker Switch ............................................................................................................ 128
Program & Setup Keys ..............................................................................................................128
1. INTRODUCTION & PHYSICAL DESCRIPTION ................................................................................. 129
1.1 General ....................................................................................................................129
1.2 Keypad & Display ..................................................................................................129
1.3 Unit (Chiller) On / OFF Switch ............................................................................... 130
1.4 Microprocessor Board ........................................................................................... 130
1.5 Ancillary Circuit Boards ......................................................................................... 130
1.6 Circuit Breakers ...................................................................................................... 130
1.7 Current Transformers (C.T.) ................................................................................... 131
1.8 Transformers .......................................................................................................... 132
1.9 Motor Protector Modules ......................................................................................132
1.10 EMS/BAS Controls ................................................................................................ 134
1.11 Microprocessor Board Layout ............................................................................... 136
1.12 Logic Section Layout ............................................................................................. 137
1.13 Anti-Recycle Timer ................................................................................................ 138
1.14 Anti-Coincidence Timer ......................................................................................... 138
1.15 Evaporator Pump Control ....................................................................................... 138
1.16 Compressor Heater Control .................................................................................... 138
1.17 Evaporator Heater Control ..................................................................................... 138
1.18 Pumpdown (LLSV) Control .................................................................................... 138
1.19 Alarms ....................................................................................................................138
1.20 Run Status (Chiller) ................................................................................................ 139
1.21 Lead / Lag Compressor Selection ........................................................................... 139
1.22 3 or 4 Compressor Chiller Configuration ................................................................ 139
2. STATUS KEY: GENERAL STATUS MESSAGES AND FAULT WARNINGS ....................................... 140
2.1 General ....................................................................................................................140
2.2 General Status Messages ....................................................................................... 140
2.3 Unit Warnings ........................................................................................................141
2.4 Anticipation Control Status Messages .................................................................. 142
2.5 Unit Fault Status Messages ................................................................................... 143
2.6 System Fault (Safety) Status Messages ................................................................ 144
2.7 Printout on Fault Shutdown ................................................................................... 147
3. DISPLAY KEYS & OPTION SWITCHES ........................................................................................... 148
3.1 General ....................................................................................................................148
3.2 Chilled Liquid Temps Key ......................................................................................148
3.3 System # Data Keys ............................................................................................... 149
3.4 Ambient Temp Key ................................................................................................ 149
3.5 Motor Current Key ................................................................................................. 149
3.6 Operating HRS / Start Counter Key ....................................................................... 150
3.7 Options Key & Dip Switch Settings ...................................................................... 150
3.8 Function Key ......................................................................................................... 152
4
TABLE OF CONTENTS (CONT'D)
YORK INTERNATIONAL