McQuay AGS 225D User Manual

2 OM AGSD-1
Table of Contents
Controller Features ...................................4
General Description...................................5
Control Panel Layout...............................5
Definitions...............................................6
Component Description.............................9
Hardware Structure..................................9
System Architecture...............................10
Sequence of Operation ............................11
Controller Operation...............................17
CP1 Inputs/Outputs ...............................17
Expansion I/O Controller 1 ...................18
Expansion I/O Controller 4 ...................19
Expansion I/O Controller 3 ...................19
Controller CP2.......................................20
Expansion I/O Controller 5 ...................21
Expansion I/O Controller 8 ...................22
Setpoints................................................22
Controller Functions ...............................26
Parameter Definitions............................26
Unit Enable............................................26
Unit Mode Selection..............................28
Unit States .............................................29
Ice Mode Start Delay.............................30
Evaporator Pump Control......................30
Leaving Water Temperature (LWT) Reset
...............................................................
31
Unit Capacity Overrides........................ 33
Building Automation System Interface. 34
Circuit Functions..................................... 39
Calculations........................................... 39
Compressor Control.............................. 40
Condenser Fan Control ......................... 45
EXV Control......................................... 47
Economizer Control.............................. 50
Alarms and Events .................................. 51
Unit Stop Alarms................................... 51
Unit Events............................................ 52
Circuit Stop Alarms............................... 52
Circuit Events........................................ 56
Alarm Logging...................................... 57
Event Logging....................................... 57
Using the Controller................................ 58
Security ................................................. 60
Editing Setpoints................................... 61
Clearing Alarms .................................... 61
Unit Controller (CP1) Screens.............. 61
Editing Review...................................... 73
Start-up and Shutdown........................... 74
Temporary Shutdown............................ 74
Extended (Seasonal) Shutdown ............ 75
Field Wiring Diagram............................. 78
Information in this manual 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; Modbus from Gould, Inc.; McQuay and MicroTech II from McQuay International.
Unit controllers are LONMARK
certified with an optional
LONWORKS
communications module
Manufactured in an ISO Certified facility

McQuay AGS 225D Specifications

General

Brand	McQuay
Model	AGS 225D
Category	Air Compressor
Language	English