14
AGZ 025D through 190D
OMM 1166-1
Overview
The MicroTech® III controller’s state-of-the-art design not only permits the chiller to run more
efficiently, 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.
Operator-friendly
The MicroTech III 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.
Controller Inputs and Outputs
Main Controller
Table 9, Analog Inputs
#
Description
Type
Expected Range
AI1
Evaporator EWT
NTC 10k
340 to 300k Ω
AI2
Evaporator LWT
NTC 10k
340 to 300k Ω
AI3
Outside Ambient
Temperature
NTC 10k
340 to 300k Ω
X1
Demand Limit
4-20 mA
1 to 23 mA
X4
LWT Reset
4-20 mA
1 to 23 mA
Table 10, Analog Outputs
#
Description
Output Type
Range
X5
Circuit 1 Fan VFD Speed
Voltage
0 to 10 volts
X6
Circuit 2 Fan VFD Speed
Voltage
0 to 10 volts
Table 11, Digital Inputs
Description
Signal Off
Signal On
DI1 External Alarm/Event
External Fault
No External Fault
DI2 Evaporator Flow Switch
No Flow
Flow
DI3
Double Set Point/ Mode
Switch
See sections on Unit Mode Selection and LWT
Target
DI4 Remote Switch
Remote Disable
Remote Enable
DI5 Unit Switch
Unit Disable
Unit Enable
Содержание AGZ 190D
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