Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013 139
In cooling mode, the plant switches on if the external air temperature is higher than the external air
temperature value set + the differential set; when the external air temperature value set (T) is reached, the
plant switches off if, subsequently, the external temperature set + the differential (T + Diff.) is reached.
In heating mode, the plant switches on if the external air temperature is lower than the external air temperature
value set + the differential set; when the external air temperature value set (T) is reached, the plant switches
off and switches on if, subsequently, the external temperature set - the differential (T - Diff.) is reached.
The figure on the right shows the on/off commands active for ExtT
operating mode. The
symbol, next to the text description of the
command, indicates that the command is enabled. AmbT operating mode
allows 5 commands to be enabled:
GenPwr Plant master switch for switch-on and switch-off;
GrpPwr Plant partial switch for switch-on and switch-off;
GenTmr General water T timer on/off command;
GrpTmr GrpTmr Partial water T timer command (Multi DDC plants
only);
Ext.T Consent for switch-on and switch-off depending on the
External Temperature;
The on/off commands in ExtT operating mode are predefined and may not be modified. It is, however,
possible to exclude some of them by configuration of the “Plant control” menu.
When plant configuration is complete, it is always necessary to set the following parameters:
Default set point see paragraph 3.4.1.1.1.1 on page 31;
Water Differential see paragraph 4.4.2.6.1 on page 93 and, for separable plants, paragraph 4.4.2.5.3 on
page88;
Regulation parameters see paragraph 4.4.2.6.4 on page 96 and, for separable plants, paragraph
4.4.2.5.4 on page89;
Building time constant see paragraph 4.4.1.10 on page77;
ExecutionReset external temperature filter see paragraph 4.4.1.11 on page77;
Set point external temperature see paragraph 3.4.1.3.1 on page46;
Differential external temperature see paragraph 3.4.1.3.2 on page 47.
In the presence of third party boilers:
Auxiliary boiler operation see paragraph 4.4.2.6.2 on page 94;
Rated plant power see paragraph 4.4.2.6.3 on page 95;
In the case of common water pumps managed by RoburBox:
RoburBox water pump delay see paragraph 4.4.2.6.5 on page98 and, for separable plants,
paragraph 4.4.2.5.5 on page90;
Once the above-mentioned items have been set, switch-on can take place via the Plant Control menu.
Activating the plant in Test mode: Plant control .
Before switching on the system, ensure that all operating parameters have been correctly configured
(temperature set point, thermostating, differential, regulation parameters, alarms etc).
To access the “Heating/Cooling Plant control” menu, select
from the main menu.
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