McQuay AWS User Manual

14 KOMAC00607-09EN
Controller Operation
MicroTech III Inputs/Outputs
I/O for the unit control and for circuits one and two are found on CP1.
The chiller may be equipped with two or three compressors.
Analog Inputs
# Description Signal Source Expected Range
AI1 Evaporator Entering Water Temp NTC Thermister (10K@25°C) -50°C – 120°C
AI2 Evaporator Leaving Water Temp NTC Thermister (10K@25°C) -50°C – 120°C
AI3 Evaporator #1 Leaving Water Temp (*) NTC Thermister (10K@25°C) -50°C – 120°C
X1 Evaporator #2 Leaving Water Temp (*) NTC Thermister (10K@25°C) -50°C – 120°C
X2 Outside Ambient Temperature NTC Thermister (10K@25°C) -50°C – 120°C
X4 LWT Reset 4-20 mA Current 1 to 23 mA
Analog Outputs
# Description Output Signal Range
X5 Fan VFD #1 0-10VDC 0 to 100% (1000 steps resolution)
X6 Fan VFD #2 0-10VDC 0 to 100% (1000 steps resolution)
X7 Fan VFD #3 0-10VDC 0 to 100% (1000 steps resolution)
X8 Fan VFD #4 0-10VDC 0 to 100% (1000 steps resolution)
Digital Inputs
# Description Signal Off Signal On
DI1 Unit PVM Fault No Fault
DI2 Evaporator Flow Switch No Flow Flow
DI3 Double Set Point/ Mode Switch Cool mode Ice mode
DI4 Remote Switch Remote off Remote on
DI5 Unit Switch Unit off Unit on
DI6 Emergency Stop Unit off/rapid stop Unit on
Digital Outputs
# Description Output OFF Output ON
DO1 Evaporator Water Pump Pump Off Pump On
DO2 Unit Alarm Alarm not Active
Alarm Active
(Flashing= circuit
alarm)
DO3 Circuit #1 Fan Step #1 Fan Off Fan On
DO4 Circuit #1 Fan Step #2 Fan Off Fan On
DO5 Circuit #1 Fan Step #3 Fan Off Fan On
DO6 Circuit #1 Fan Step #4 Fan Off Fan On
DO7 Circuit #2 Fan Step #1 Fan Off Fan On
DO8 Circuit #2 Fan Step #2 Fan Off Fan On
DO9 Circuit #2 Fan Step #3 Fan Off Fan On
DO10 Circuit #2 Fan Step #4 Fan Off Fan On

McQuay AWS Specifications

General

Brand	McQuay
Model	AWS
Category	Chiller
Language	English