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PC-2 CONTROL
FEATURES
UGH004/0999 microKool Portable Chillers
OPERATION 4-3
Pumpdown On/Off
The Pumpdown feature prevents
refrigerant migration. The compres-
sor turns on and off as needed to
store refrigerant in the condenser.
Display Select button
Press repeatedly until a green light
appears next to the parameter you want
to program or view.
All normal operating functions can be controlled from the
microKool PC-2 control panel, including the optional pump-
down feature.
Status lights
The lights indicate the oper-
ating status of the listed
components. Except in Test
Mode and Auto Start, the
lights indicate:
= Off or inactive
= On or active (green)
= Alarm condition (red)
Test Mode is used for testing
displays, keys and input/out-
put functions. When test
mode is enabled, normal
operation is disabled.
= Test Mode off
= Test Mode on (red);
unit disabled
Auto Start allows you to start
and stop the chiller from a
remote switching
or timing device, such as the
processing machine control.
This feature can only ben
enabled by configuring a dip
switch on the control mother-
board.
= Disabled; Auto Start
not available
= Enabled
(flashing green);
unit can start any time
= On and under control of
the remote device
Actual values display
The green window displays the temperature
at the middle of the process. The control
point for this temperature is selectable as
the temperature at the supply outlet, return
inlet or the average of the two temperatures.
The lights indicate whether the temperature
is in degrees Fahrenheit or Celsius. See the
I
NSTALLATION
section for instructions on how
to change the temperature units.
Setpoint display
The Setpoint display shows the
setpoints entered for fluid temper-
ature, high and low temperature
deviation alarms, the SPI baud
rate, and the SPI address.
Setpoint and Actual value display
windows also display some alarm
codes and setup instructions.
Run/Stop
Press the RUN button to
start normal operation.
Press STOP to stop the
unit.
= Running (green)
= Stopped (red)
= Alarm (red, flashing)
Setpoint adjustment buttons
Press ▲ or ▼ to enter the process
temperature setpoint, SPI parameters
and passcodes.
Press ▲ to increase a value.
Press ▼ to decrease a value.
TIP: Press and hold the button for
faster scrolling speed.
Alarm
Press to acknowledge the
alarm light and silence the
optional audible alarm. The
alarm light will flash until the
cause of the alarm condition
is fixed. See Troubleshooting
for alarm descriptions and
remedies.
Setpoint Select button
Press repeatedly until a green light
appears next to the parameter you
want to program or view.
NOTE: Default settings for the
deviation setpoints are:
High = setpoint + 10° F
Low = setpoint - 10° F
A warning alarm occurs (indicator light
red) whenever the actual temperature
is outside this setpoint range for more
than 15 minutes.
Recommended setting: ± 2-10° F.