Controller Inputs and Outputs ESIE10-01
3–56 Part 3 – Troubleshooting
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2.2 Main Board Controller (POL687.70/MCQ)
Analog inputs
Analog outputs
Digital 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
# 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)
# 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
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