Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013 115
It is possible to activate or not and separately configure the heating and cooling mode.
As an alternative to this function, limited to the heating mode, a simplified version can be activated that
operates only by preventing the use of the least efficient heat generators (boilers) over an external
temperature data. In this case, once the function is activated, just one parameter must be set:
• Boiler disabling external temperature threshold: the external temperature value must be set over which
the boilers must not be used.
Follow the instructions given below to activated and configure the function:
1 - Select
from the initial screen to gain access to the main menu.
2 - Select
to gain access to the System installation.
3 - Enter the installer password, if requested, on the numerical keypad that appears on the display.
4 - Select “Plants” from the drop-down menu.
5 - Select the
symbol for two-line cooling/heating plants, for hot water production plants, or
for chilled water production plants.
6 - Turn the knob to scroll the cursor downward until highlighting “Base plant part” and press the knob.
7 - Turn the knob to scroll the cursor downward until highlighting “Cool/Heat. serv. Conf.”.
8 - Turn the knob to scroll the cursor downwards until “Max.
Power Limiting” is selected, and press the
knob to access the screen.
9 - Only for 2-line hot/cold systems: select the button with the
or symbol, to select the functioning
mode for which the parameters are to be set:
for HEATING, for COOLING.
10 - To activate the function for the cooled water production system, select the only option available, “Limit
Max Power”. At this point, page 2/2 must be accessed to set/modify the three parameters relative tot he
function: Outdoor temperature at 100% and 0% power and Activation delay of the limitation function from
system switch-on.
11 - To activate the function for the hot water production system, choose and select one of the “Limit Max.
Power” or “Lock boilers” options. In both cases, page 2/2 must be accessed to set/modify:
• If “Limit Max Power” is selected, the three parameters stated in point 10, relative to the hot water
production system.
• If “Lock boilers” is selected, the outdoor temperature threshold parameter prevents the boilers.
12 - To exit, select
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