Standard Controller Operation - Conair EP2 series User Manual

Standard Controller Operation

Table 8 - Operating Buttons
Button
Start 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 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 is 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. The Start button
also performs a "Cancel" function while in the programming menu.
Alarm Silence / When an alarm condition is present, the alarm light is on and red. The first Alarm Silence/Reset button press will silence
Alarm Reset the alarm horn (optional), open the remote alarm contact (optional), and the alarm light changes 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 Press and hold the Compressor Running Hours Button to display the amount of time that each compressor in the system
Running Hours 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.
Pump Running Press and hold the Pump Running Hours Button to display the amount of time the pump has run. The running hours
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 will show while holding the button. Control is not disturbed while displaying the pump
running hours.
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
segments by briefly lighting each sequentially. As
part of this initial diagnostic test, the program
revision level displays for a moment. After the initial
diagnostic sequence is completed, the controller is
ready for operation.
Description of Operation
13