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McQuay
Chiller
AWS
McQuay AWS User Manual
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Operating Manual
KOMAC0
0607-09EN
Date:
July 2009
Supercedes:
None
Contr
ol Panel
Air
-Cooled Scr
ew Chillers
AW
S
50 Hertz
R-134a
2
Table of Contents
Table of Contents
2
Introduction
3
Operating Limits
4
Controller Features
4
General Description
5
Panel Layout
5
Panel Layout
6
Components
7
Controller Description
9
Structure
9
Sequence of Operation
11
Controller Operation
14
Ircuit #1 to #3
15
(Pol)
16
Unit Functions
21
Nable
21
Ode Selection
21
Ontrol States
22
Tatus
23
Start Delay
23
Pump Control
23
Eduction
24
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
Appendix
64
Definitions
64
4
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McQuay AWS Specifications
General
Type
Air-Cooled Scroll Chiller
Brand
McQuay
Refrigerant
R-410A
Compressor Type
Scroll
Frequency
60 Hz
Capacity
20 to 130 tons
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