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Standard Controller Operation
The chiller includes a controller to perform all
control functions directly from the front panel. When
Control Power is applied, the controller initiates a
diagnostic test of each indicating light and display
segment which momentary lights them sequentially.
As part of this initial diagnostic test, the program
revision level display in the temperature display for a
moment. After the initial diagnostic sequence is
completed, the controller is ready for operation.
Start Button
Depressing the Start button will start the pump and
enable the compressor. The compressor (and
condenser fans if the chiller is air-cooled) will start
only if the microprocessor is calling for cooling
because the actual To Process temperature is higher
than the Set Point temperature. If the Autostart
feature is enabled the Autostart signal will have
precedence over the Start Button. See the Program
Menu section for instructions on how to enable or
disable the Autostart feature. The Start button also
performs an “Enter” function while in the
programming menu.
Stop Button
Depressing the Stop button will shut off the
compressor, pump, condenser fans (if the chiller is
air-cooled), and clear all fault signals. If the Autostart
feature is enabled and an Autostart signal present,
the Stop button will not stop the chiller. See the
Program Menu section for instructions on how to
enable or disable the Autostart feature.
This button also performs a “Cancel” function while
in the programming menu.
Alarm Silence / Alarm Reset
Button
When an alarm condition is present, the alarm LED
above the Alarm Silence/Reset button will be on and
red. The first Alarm Silence/Reset button press will
silence the alarm horn (optional), open the remote
alarm contact (optional), and the LED toggles from
red to yellow. The alarm horn and/or remote alarm
contact remain disabled until a subsequent alarm
occurs. A second press of the Alarm Silence/Reset
button resets the state from Alarm to Normal
Operation.
The High Refrigerant Pressure and Pump Overload
require a mechanical safety manual reset before the
control board reset. If the fault is still present, the
unit will immediately go into a new alarm state.
Compressor Running Hours
Button
Press and hold the Compressor Running Hours
Button to display the amount of time that each
compressor in the system has run. The Set Point
window will show which compressor’s usage is being
displayed (for units with two compressors). The
running hours show in the process display window.
Display of running hours is in units of hundreds so a
display value of 10 would mean 1,000 hours. The
running hours show while holding the button. For
units with two compressors, the display will toggle
between the two compressors every three seconds.
The hours show while holding the button. Control is
not disturbed while displaying the running hours.
