2 OM AGSB-5
Table Of Contents
MICROTECH II™ FEATURES .......4
GENERAL DESCRIPTION ..............5
COMPONENT DESCRIPTION........6
Unit and Circuit Controller Description ..8
CONTROL OPERATION ...............10
CIRCUIT CONTROLLER..............10
Inputs/Outputs.......................................10
Setpoints................................................11
Compressor Control...............................15
Condenser Fan Control..........................19
EXV Control..........................................21
Evaporator Oil Return Line Control......23
Oil Heater Control.................................23
Interstage Injection................................23
UNIT CONTROLLER .....................24
Inputs/Outputs.......................................24
Setpoints................................................24
Unit Enable............................................26
Unit Mode Selection..............................27
Evaporator Pump State Control.............30
Evaporator Heater Control ....................30
Leaving Water Temperature (LWT) Reset
...............................................................30
ALARMS AND EVENTS ................33
Alarm and Event Logging .....................35
USING THE CONTROLLER.........37
Security..................................................39
Entering Passwords ...............................39
Editing Setpoints ...................................39
Clearing Alarms.....................................39
Unit Controller Menus...........................40
Screen Definitions.................................41
SET Screen Definitions.........................43
Circuit Controller Menus.......................47
Screen Definitions.................................47
SEQUENCE OF OPERATION.......52
START-UP AND SHUTDOWN......54
Expansion Valve Operation ...................55
Extended (Seasonal) Shutdown.............57
Evaporator Freeze Protection ................58
Operating Limits: ..................................59
REFRIGERANT CHARGING........60
BAS INTERFACE............................63
FIELD WIRING DIAGRAM ..........64
Manufactured in an ISO Certified facility
"McQuay" is a registered trademark of 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; GeneSys, McQuay and MicroTech II from McQuay International.
Unit controllers are LONMARK
certified with the optional
LONWORKS
communications module.
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