Microprocessor Control; Introduction; Setting The Process Water Temperature; Led Indicators - AEC PCA SERIES Operation And Installation Manual

5
5-1

Introduction

Standard PCA 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.
5-2

Setting the Process Water Temperature

5-3

LED Indicators

PV or Process Value Numeric LED
During normal operation, the large red
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
point you want the chiller to maintain. It also displays parameter and pre-set function
values during setup.
OUT1 LED
The orange OUT1
solenoid valve.
Page 26

Microprocessor Control

PCA Control Operation Range
Standard models 30°F to 65°F (-1ºC to 18ºC)
To change the process water temperature set point:
• Press the
• Press the
PV
LED on the controller displays the process set
SV
LED lights when the control output energizes the hot-gas bypass
Up Arrow button to raise the set point.
Down Arrow button to lower the set point.
LED on the controller displays the actual
PCA Series Chillers