Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013 93
4.4.2.6 Base plant part
By means of this menu it is possible to set the operation parameters of the base plant.
The term “Base plant” means the plant part containing all the units, excluding the ones that can be
separated from the same plant.
The options available in this menu are:
4.4.2.6.1 Water Differential
4.4.2.6.2 Auxiliary boiler operation
4.4.2.6.3 Rated plant power
4.4.2.6.4 Regulation parameters
4.4.2.6.5 RoburBox water pump delay
4.4.2.6.6 Units use priority (Master DDC of plants with GAHP- GS/WS only)
4.4.2.6.7 Temperature Alarm Setup (Master DDC only)
4.4.2.6.8 Cool/Heating inversion valve parameters
4.4.2.6.9 Cooling/heating service configuration
4.4.2.6.10 Heating/DHW select
4.4.2.6.11 Base DHW service configuration
4.4.2.6.1 Water Differential
The screen shows the differential set on the set point temperature. The
figure contains the value for a chilled water production plant.
Configuration of differential
To set the value or values of the differential, proceed as follows.
1 - Select
from the initial screen to gain access to the main menu.
2 - Select
to gain access to the System installation.
3 - If required, enter the installer password on the numerical keypad that appears on the display.
4 - Select “Plants” from the drop-down menu.
5 - Select the plant for which the differential is to be set:
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 - Select “Wat.Differential” from the drop-down menu.
8 - Place the cursor on the differential value to be modified: for “cold only” plants
only the value of the
cooling differential will appear (Condit); for the “hot only” plants
only the value of the heating
differential will appear (Heating), for the two-line hot/cold plants
the values of both heating and
cooling differentials will appear (Condit. and Heating).
9 - Press the knob to allow the change of the selected value.
10 - Turn the knob to modify the value.
11 - Press the knob to confirm the set value.
NOTE
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