Sterling Power Products 30F to 65F Microprocessor Control, 5-1Introduction, 5-3LED Indicators

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.

Page 26 SMC Series Chillers