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2-40 HP Portable Chillers Chapter 4: Operation 29 of 78
Chapter 4: Operation
4-1 Panel Buttons, Indicator Lights, and Switches
Microprocessor Controllers
Standard chillers use a microprocessor-based PID controller. These controllers are modular,
self-contained units that can slide from their mounting housing. They are factory set and
adjusted; no field adjustment to the internal controls are necessary. Their standard operation
range is 30ºF to 65ºF (-1ºC to 18ºC). See Figure 7: Typical Portable Chiller Microprocessor
Controller.
E5CK Controller
Indicator Name Description
PV
8.8.8.8
Process Value 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
8.8.8.8
Set Value 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 set
up.
OUT1
Out 1 LED The orange OUT1 LED lights when the control
output energizes the hot-gas bypass solenoid valve
OUT2
Out 2 LED The orange OUT2 LED lights whenever the
process temperature is two degrees or more above
the “To Process” setpoint. The compressor then
comes on and runs until the temperature at the “To
Process” thermocouple is two degrees below the
setpoint.
MANU
MANU LED The orange MANU LED is not used and does not
light.
STOP
Stop LED The orange STOP LED is not used and does not
light.
RMT
RMT LED The orange RMT LED is lit during remote
operation.
AT
AT LED The orange AT LED flashes during auto-tuning.