Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013 119
Partial chronothermostat (Master DDC only): The chronothermostat of the Master DDC gives the on
command only to the units that it manages directly.
In practice, two typical configurations are used:
1. Single chronothermostat: the plant is controlled exclusively by the Master DDC chronothermostat. It is
necessary to select the “General” option described above and to disable the chronothermostat command
on the Slave DDCs. (see Paragraph “On/off command configuration” on page 103). In addition, it is
necessary to connect the ambient temperature sensor, supplied as an optional extra, to the Master DDC.
2. Zone chronothermostat: with this type of configuration it is possible to control the temperature of 3
different environments. It is necessary to enable the chronothermostat commands on all of the DDCs and
select the “Partial” option described above on the Master DDC. In addition, it is necessary to connect the
ambient sensors (supplied as an optional extra) to each DDC.
Instructions for setting the “Chronot. Op. Mode” on the Master DDC follow:
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 “Chronot. Op. Mode” is selected, and press the knob to
access the screen.
9 - Position the cursor on
next to the option to be set (general,group) and press the knob to make the
choice. The
symbol indicates that the option has been enabled .
10 - To exit, select
.
Repeat steps 5 to 8 for the second plant if the DDC is the Master DDC for two plants.
4.4.2.6.10 Heating/DHW select
By means of this sub-menu item, it is possible to choose if the machines that build up the base plant serve
only for the production of hot water for the heating plant or if they serve for the production (also contemporary)
of hot water for the heating plant and of domestic hot water (DHW).
1 - Select
from the initial screen to gain access to the main menu.
NOTE
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