Unit installation

58 ACZ / AGZ-BM IOMM ACZ/AGZ-3
Overview
MicroTech II controller’s state-of-the-art design not only permits the chiller to run more efficiently,
but also simplifies troubleshooting if a system failure occurs. Every MicroTech II controller is
programmed and tested prior to shipment to facilitate start-up.
The AGZ-AM controller software is identical to the software used in the AGZ-AS packaged chiller.
Some field wiring is required between the remote evaporator and the outdoor unit.
Operator-friendly
The MicroTech II controller menu structure is separated into three distinct categories that provide
the operator or service technician with a full description of current unit status, control parameters,
and alarms. Security protection prevents unauthorized changing of the setpoints and control
parameters.
The MicroTech II 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 II chiller controller will
also retain and display that the date/time the fault occurred. In addition to displaying alarm
diagnostics, the MicroTech II chiller controller also provides the operator with a warning of limit
(pre-alarm) conditions.
AGZ-B Inputs/Outputs
Table 37, Analog Inputs
No. Description Type Signal Source Range
1 Evaporator Refrigerant Pressure #1 C1 0.1 to 0.9 VDC 0 to 132 psi
2 Evaporator Refrigerant Pressure #2 C2 0.1 to 0.9 VDC 0 to 132 psi
3 Condenser Refrigerant Pressure #1 C1 0.1 to 0.9 VDC 3.6 to 410 psi
4 Leaving Evaporator Water Temperature UT
NTC Thermister
(10k@25°C)
-58 to 212°F
5 Outside Ambient Temperature UT
NTC Thermister
(10k@25°C)
-58 to 212°F
6 Condenser Refrigerant Pressure #2 C2 0.1 to 0.9 VDC 3.6 to 410 psi
7 Reset of Leaving Water Temperature UT 4-20 mA Current 0-(10 to 80°F)
8 Demand Limit UT 4-20 mA Current 0-100 % Load
9 Compressor Suction Temperature #1 C1
NTC Thermister
(10k@25°C)
-58 to 212°F
10 Compressor Suction Temperature #2 C2
NTC Thermister
(10k@25°C)
-58 to 212°F
NOTE: C1 = Refrigerant Circuit #1, C2 = Refrigerant Circuit #2, UT = Unit
Table 38, Analog Outputs
No. Description Output Signal Range
1 Fan #1 VFD 0 to 10 VDC 20 to 60 Hz
2 Fan #2 VFD 0 to 10 VDC 20 to 60 Hz