Overview; Controller Inputs And Outputs - Daikin AGZ 025D Operating & Maintenance Manual

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
AI1 Evaporator EWT
AI2 Evaporator LWT
Outside Ambient
AI3
Temperature
X1 Demand Limit
X4 LWT Reset
Table 10, Analog Outputs
# Description
X5 Circuit 1 Fan VFD Speed
X6 Circuit 2 Fan VFD Speed
Table 11, Digital Inputs
Description
DI1 External Alarm/Event
DI2 Evaporator Flow Switch
Double Set Point/ Mode
DI3
Switch
DI4 Remote Switch
DI5 Unit Switch
14
Type Expected Range
340 to 300k Ω
NTC 10k
340 to 300k Ω
NTC 10k
340 to 300k Ω
NTC 10k
4-20 mA 1 to 23 mA
4-20 mA 1 to 23 mA
Output Type Range
Voltage 0 to 10 volts
Voltage 0 to 10 volts
Signal Off
External Fault
No Flow
See sections on Unit Mode Selection and LWT
Target
Remote Disable
Unit Disable
AGZ 025D through 190D
Signal On
No External Fault
Flow
Remote Enable
Unit Enable
OMM 1166-1