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Translation from original instructions
5.7 Control panels
This line of units can be managed with two electronic microprocessor controls; one parametric and the other programmable.
The next sections describe the basic operations for both controls, such as starting and stopping the unit, changing operation
from cooling to heating and vice versa (in units with heat pump), and changing the set point.
For the other operations, refer to the manual of the control that is an integral part of the documentation of the unit.
5.7.1 Parametric control
The reference for the following instructions is the main screen that is accessed, from any other screen, with repeated pres-
sing of the "menu" button or with pressing of the "set" button from the set point screens.
5.7.1.1
Switching the unit on/off
When the digital input of the external OK signal is open, “OFF” appears on the display and a LED flashes between the two
"effs" of the word "OFF".
Fig. 8 Parametric control display with external OK signal device open
When the digital input of the external OK signal closes, if the unit was not previously switched on from the keypad, "Stby"
appears on the display, otherwise the unit starts in the operating mode that was active before the digital input opened.
When "Stby" is show on the display, to switch on the unit in cooling mode, you must press button
or, in units that also
work in heating mode, press button .
To switch off the unit from the keypad, press the button corresponding to the symbol present on the display.
In units where the change of cooling/heating operation is made from the keypad, if the button with the sym
-
bol that is not present on the display is pressed accidentally, the control reverses the operation of the unit.
5.7.1.2
Changing from cooling to heating
It is possible to change operation from cooling to heating and vice versa only in units that have this feature. The change can
be made using the display keypad or from digital input.
In both cases, the change of operation can be made even if the unit is running. If the change of operation takes place with
the unit running, the control manages this by stopping the compressors and observing the set delays before restarting them.
In units where the change of operation is from the keypad, the required operation is activated using the same buttons
or
used for switching on and switching off as described above.
In units where the change of operation is from digital input, when the input is closed, the unit can be started in heating mode
only, or when it is open, the unit can be started in cooling mode only.
When the change of operation is from digital input, buttons and can in any case be used to put the unit in standby in
the relevant operating mode.
