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microKool Portable Chillers UGH004/0999
4-6 OPERATION
Before starting the chiller, verify that the system has been
installed correctly for your application. See the
I
NSTALLATION
section. If Passcode Protection has been enabled, you must
enter the correct passcode before you can change or enter any
of the operating parameters, including the setpoint.
Turn on main power to the chiller at least 12
hours before you want to begin processing.
This allows time for crankcase heater to evaporate liquid
refrigerant migrating in the compressor. When power is
turned on:
◆ The compressor crankcase heater turns on.
◆ Indicator lights blink green, then red.
◆ Setpoint and actual windows will display for
three seconds, followed by the software version. The
windows then display the previously entered setpoint
and the actual temperature.
Make sure the chiller tank is full of fluid.
Turn on the water supply to the chiller (MPW).
The supply must be at least 25 psi. Check for leaks in the
condenser water and process fluid lines before continuing.
Enter the passcode,
if necessary.
Hold the Setpoint
Select button for 5 seconds. When
the control displays 1 PaS, use the
setpoint adjustment buttons to enter
the passcode. Press the Setpoint
Select button again.
Enter the temperature set-
point.
Press the Setpoint Select
button until the green light appears
next to Temperature. Press
▲ to
increase or
▼ to decrease the
temperature setting.
Press to start normal operation.
◆ The RUN/STOP light turns green.
◆ The pump begins operating. The compressor turns on
after 3 seconds, if the actual temperature is above the
setpoint.
◆ Normal operation begins. The unloader valves turn on if
the actual temperature is below setpoint. The compres-
sor remains active until the actual temperature is 6° F
below the setpoint.
If the Alarm light turns on, press to silence the option-
al audible alarm. Then see the
T
ROUBLESHOOTING
section.
STARTING THE
CHILLER
1
2
3
Run
IMPORTANT:
If you are
operating the chiller for the
first time since installation,
you should perform an Auto
Tune after two hours of nor-
mal operation. You should
perform the Auto Tune peri-
odically to ensure that the
control correctly calculates
how much heat and cooling
should be applied to main-
tain the process setpoint.
See P
ERFORMING AN
A
UTO
T
UNE
.
5
4
6