Daikin AGZ080E - Unit Controller Operation; General Description

UnIT ConTroller operaTIon
www.DaikinApplied.com 43 IOM 1206-7 • TRAILBLAZER
™
MODEL AGZ CHILLERS
UnIT ConTroller operaTIon
General Description
The MicroTech
®
III controller’s design not only permits
the chiller to run more efciently, but also can simplify
troubleshooting if a system failure occurs. Every MicroTech
®
IIII controller is programmed and tested prior to shipment to
facilitate start-up.
The controller menu structure is separated into three distinct
categories that provide the operator or service technician with
a full description of:
1. current unit status
2. control parameters
3. alarms
Security protection prevents unauthorized changing of the
setpoints and control parameters.
MicroTech
®
III control continuously performs self-diagnostic
checks, monitoring system temperatures, pressures and
protection devices, and will automatically shut down a
compressor or the entire unit should a fault occur. The cause
of the shutdown will be retained in memory and can be easily
displayed in plain English for operator review. The MicroTech
®
III chiller controller will also retain and display the date/time the
fault occurred. In addition to displaying alarm diagnostics, the
MicroTech
®
III chiller controller also provides the operator with
a warning of limit (pre-alarm) conditions.
System Architecture
The overall controls architecture uses the following:
• One MicroTech
®
III unit controller
• I/O extension modules as needed depending on the
conguration of the unit
• Communications interface(s) as needed based on
installed options
Communication interface modules will connect directly to the
left side of the unit controller. I/O extensions will connect
via peripheral bus using the connection on the right side of
the controller. All of the I/O extension modules can connect
directly or using a wiring harness.
Figure 46: System Architecture
BAS Interface
(Bacnet, Lon,
Modbus)
I/O Extension
EEXV 2
I/O Extension
RapidRestore®
I/O Extension
EEXV1
I/O Extension
CC1
BAS Interface
Modbus)
(Bacnet, Lon,
Peripheral Bus
I/O Extension
CC2
BAS Interface
(Bacnet, Lon,
Modbus)
MicroTech® III Controller - UC