15
4.2
UC CONTROLLER
Controller buttons:
Alarm button:
Displays the list of active alarms. It's also used to manually reset alarms
Prg button:
Used to access the configuration menu (for authorized service only)
Esc button:
Return to the main screen
Up – Down buttons:
Navigate between the display screens or increase/decrease the value of a
selected parameter
Enter button:
Used to enter a subscreen/menu from the main screen or to switch between screen
navigation and the different parameters that can be modified on a particular screen
Main screen:
The main screen shows the current outlet temperature, the current setpoint and it shows which motors in the
chiller are currently running.
The motor symbols are, from left to right, the water pump, the refrigerant compressor and the motor fan.
If a motor is running, its symbol is lit and if it is stopped, its symbol is not shown. A blinking symbol means that
an Off signal has been received, but the motor is still running and it will turn Off shortly, it is being delayed by
an internal minimum running time timer in the chiller’s software.
From the main screen it's also possible to access the On/Off screen, the setpoint screens and the information
screens loop. Use the
Up
/
Down
buttons to select the desired subscreen/menu and press
Enter
to access it:
Pressing
Esc
from any screen goes back to this main screen.
4.3
OPERATION
Remote On/Off and On/Off from the display:
The unit will only turn On when it receives
both
an On signal
from its remote On/Off contacts (circuit closed between terminals 23 and 24, see point 2.6) and it
also
receives an On command from the display. In the same way, the unit will turn Off either when the circuit
between terminals 23 and 24 is open or when an Off command is issued from the display.
On/Off memory:
Bear in mind that, when the Main Power Switch is turned On, the controller comes back to
the last mode/status (“On” or “Off”) as it was when the Main Power Switch was last as powered off.
This means that, if the chiller was running when the Main Power Switch was turned Off, it will start suddenly
next time it is switched back On.
On/Off screen
Setpoint
screens
Information screens loop
