McQuay AWS User Manual

2 KOMAC00607-09EN
Table of Contents
INTRODUCTION..........................................3
OPERATING LIMITS:.................................4
CONTROLLER FEATURES.......................4
GENERAL DESCRIPTION.........................5
CONTROL PANEL LAYOUT............................5
POWER PANEL LAYOUT................................6
ECONOMIZER COMPONENTS.........................7
CONTROLLER DESCRIPTION.................9
HARDWARE STRUCTURE ..............................9
SYSTEM ARCHITECTURE.............................10
SEQUENCE OF OPERATION..................11
CONTROLLER OPERATION..................14
MICROTECH III INPUTS/OUTPUTS ..............14
EXTENSION I/O COMPRESSOR #1 TO #3......15
I/O EXV CIRCUIT #1 TO #3 ........................15
EXTENSION I/O FAN MODULE CIRCUIT #1 &
2.................................................................16
EXTENSION I/O FAN MODULE CIRCUIT #3 .16
EXTENSION I/O UNIT ALARM & LIMITING
(POL).........................................................16
SETPOINTS..................................................17
UNIT FUNCTIONS.....................................21
CALCULATIONS ..........................................21
UNIT ENABLE .............................................21
UNIT MODE SELECTION..............................21
UNIT CONTROL STATES..............................22
UNIT STATUS..............................................23
ICE MODE START DELAY ...........................23
EVAPORATOR PUMP CONTROL...................23
NOISE REDUCTION .....................................24
LEAVING WATER TEMPERATURE (LWT)
RESET.........................................................24
UNIT CAPACITY CONTROL .........................26
UNIT CAPACITY OVERRIDES.......................28
CIRCUIT FUNCTIONS..............................30
CALCULATIONS ..........................................30
CIRCUIT CONTROL LOGIC...........................30
CIRCUIT STATUS.........................................32
COMPRESSOR CONTROL .............................32
CONDENSER FAN CONTROL........................34
EXV CONTROL...........................................35
ECONOMIZER CONTROL..............................36
LIQUID INJECTION ......................................36
ALARMS AND EVENTS............................37
SIGNALING ALARMS...................................37
CLEARING ALARMS ....................................37
DESCRIPTION OF ALARMS ..........................37
UNIT EVENTS..............................................39
CIRCUIT STOP ALARMS ..............................40
CIRCUIT EVENTS ........................................44
ALARM LOGGING .......................................45
USING THE CONTROLLER ....................46
NAVIGATING ..............................................47
OPTIONAL REMOTE USER INTERFACE
.......................................................................53
START-UP AND SHUTDOWN .................55
TEMPORARY SHUTDOWN............................55
EXTENDED (SEASONAL) SHUTDOWN..........56
FIELD WIRING DIAGRAM......................58
SYSTEM MAINTENANCE........................60
PREVENTATIVE MAINTENANCE SCHEDULE 63
APPENDIX...................................................64
DEFINITIONS...............................................64
©2009 McQuay International. Information covers the McQuay International products at the time of publication and we reserve the right to
make changes in design and construction at anytime without notice. ®™ The following are trademarks or registered trademarks of their
respective companies: BACnet from ASHRAE; L
ONMARK and LONWORKS from Echelon Corporation; McQuay, MicroTech III, Guardister,
and Open Choice from McQuay International.
Unit controllers are LONMARK
certified with an optional
LONWORKS
communications module
Manufactured in an ISO Certified facility

McQuay AWS Specifications

General

Brand	McQuay
Model	AWS
Category	Chiller
Language	English