Control Panel McQuay

Control Panel
Air-Cooled Screw Chillers
AWS
50 Hertz
R-134a

Table of Contents
INTRODUCTION
OPERATING LIMITS
CONTROLLER FEATURES
GENERAL DESCRIPTION
CONTROL PANEL LAYOUT
POWER PANEL LAYOUT
ECONOMIZER COMPONENTS
CONTROLLER DESCRIPTION
HARDWARE STRUCTURE
SYSTEM ARCHITECTURE
SEQUENCE OF OPERATION
CONTROLLER OPERATION
MICROTECH III INPUTS/OUTPUTS
EXTENSION I/O COMPRESSOR #1 TO #3
I/O EXV CIRCUIT #1 TO #3
EXTENSION I/O FAN MODULE CIRCUIT #1 & 2
EXTENSION I/O FAN MODULE CIRCUIT #3
EXTENSION I/O UNIT ALARM & LIMITING (POL)
SETPOINTS
UNIT FUNCTIONS
CALCULATIONS
UNIT ENABLE
UNIT MODE SELECTION
UNIT CONTROL STATES
UNIT STATUS
ICE MODE START DELAY
EVAPORATOR PUMP CONTROL
NOISE REDUCTION
LEAVING WATER TEMPERATURE (LWT) RESET
UNIT CAPACITY CONTROL
UNIT CAPACITY OVERRIDES
CIRCUIT FUNCTIONS
CALCULATIONS
CIRCUIT CONTROL LOGIC
CIRCUIT STATUS
COMPRESSOR CONTROL
CONDENSER FAN CONTROL
EXV CONTROL
ECONOMIZER CONTROL
LIQUID INJECTION
ALARMS AND EVENTS
SIGNALING ALARMS
CLEARING ALARMS
DESCRIPTION OF ALARMS
UNIT EVENTS
CIRCUIT STOP ALARMS
CIRCUIT EVENTS
ALARM LOGGING
USING THE CONTROLLER
NAVIGATING
OPTIONAL REMOTE USER INTERFACE
START-UP AND SHUTDOWN
TEMPORARY SHUTDOWN
EXTENDED (SEASONAL) SHUTDOWN
FIELD WIRING DIAGRAM
SYSTEM MAINTENANCE
PREVENTATIVE MAINTENANCE SCHEDULE
APPENDIX
DEFINITIONS
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