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Page 26 SMC Series Chillers
5 Microprocessor Control
5-1 Introduction
Standard SMC Series chillers use a microprocessor-based PID controller. The
controller is a modular, self-contained unit that can slide from its mounting housing. It
is factory set and adjusted; no field adjustment to the internal controls is necessary.
SMC Control Operation Range
Standard models 30°F to 65°F (-1ºC to 18ºC)
5-2 Setting the Process Water Temperature
To change the process water temperature set point:
• Press the Up Arrow button to raise the set point.
• Press the Down Arrow button to lower the set point.
5-3 LED Indicators
PV or Process Value Numeric LED
During normal operation, the large red PV LED on the controller displays the actual
process temperature at the To Process thermocouple. It also lists parameter symbols
during setup and error messages if an error occurs.
SV or Set Value Numeric LED
During normal operation, the green SV LED on the controller displays the process set
point you want the chiller to maintain. It also displays parameter and pre-set function
values during setup.
OUT1 LED
The orange OUT1 LED lights when the control output energizes the hot-gas bypass
solenoid valve.