Overview; General Description; Inputs/Outputs - McQuay AGZXXXBS Series Installation, Operation And Maintenance Manual

Overview

MicroTech II 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 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 full description of 1) current unit
status, 2) control parameters, and 3) alarms. Security protection prevents unauthorized
changing of the setpoints and control parameters.
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 the fault
occurred.
controller also provides the operator with a warning of limit (pre-alarm) conditions.

General Description

AGZ-B Inputs/Outputs
Table 35, Analog Inputs
NOTE: C1 = Refrigerant Circuit #1, C2 = Refrigerant Circuit #2, UT = Unit
Table 36, Analog Outputs
IOMM AGZ-5
In addition to displaying alarm diagnostics, the MicroTech II chiller
No. Description
1 Evaporator Refrigerant Pressure #1
2 Evaporator Refrigerant Pressure #2
3 Condenser Refrigerant Pressure #1
4 Leaving Evaporator Water Temperature
5 Outside Ambient Temperature
6 Condenser Refrigerant Pressure #2
7 Reset of Leaving Water Temperature
8 Demand Limit
9 Compressor Suction Temperature #1
10 Compressor Suction Temperature #2
No.
1 Fan #1 VFD
2 Fan #2 VFD
AGZ 026B through 130B
Type
C1
C2
C1
UT
UT
C2
UT
UT
C1
C2
Description
Signal Source Range
0.1 to 0.9 VDC 0 to 132 psi
0.1 to 0.9 VDC 0 to 132 psi
0.1 to 0.9 VDC 3.6 to 410 psi
NTC Thermister
-58 to 212°F
(10k@25°C)
NTC Thermister
-58 to 212°F
(10k@25°C)
0.1 to 0.9 VDC 3.6 to 410 psi
4-20 mA Current 0-(10 to 80°F)
4-20 mA Current 0-100 % Load
NTC Thermister
-58 to 212°F
(10k@25°C)
NTC Thermister
-58 to 212°F
(10k@25°C)
Output Signal Range
0 to 10 VDC 20 to 60 Hz
0 to 10 VDC 20 to 60 Hz
55