Unit installation

92 ACZ / AGZ-BM IOMM ACZ/AGZ-3
Overview
The MicroTech II controller’s state-of-the-art design not only permits the condensing unit 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.
Operator-friendly
The MicroTech II controller menu structure is separated into three distinct categories that provide
the operator or service technician with a 1) full description of current unit status, 2) control
parameters, and 3) 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 the date/time that the fault occurred. In addition to displaying alarm
diagnostics, the MicroTech II controller also provides the operator with a warning of limit (pre-
alarm) conditions.
ACZ-B Inputs/Outputs
Table 47, Analog Inputs
# 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 Open
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 Open
8 Demand Limit UT 4-20 mA Current 0-100 % Load
9 Open
10 Open
NOTE: C1 = Refrigerant Circuit #1, C2 = Refrigerant Circuit #2, UT = Unit
Table 48. Analog Outputs
# 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
3 Open
4 Open
5 Open
6 Open