Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013 133
Maintaining the cooling or heating operating mode in use;
Switching off the plant.
In RYWa operating mode, the simultaneous closure of the R -Y and R – W contacts is not permitted. If this
should happen accidentally, the Direct Digital Controller signals the anomaly “E1005 RY and RW both ON”.
Furthermore, in RYWa operating mode, the
icon of the “Plant control” menu is disabled.
The figure on the right shows the commands that are enabled for RWYa
operating mode. The
symbol next to the text description of the
command, indicates that the command is enabled.
RY - RW External RY-RW on/off commands;
AutoYW Automatic switching from COOLING operating mode to
HEATING operating mode or vice versa;
GenTmr General water T timer on/off command;
GrpTmr GrpTmr Partial water T timer on/off command (Multi DDC
plants only).
The on-off commands present in RWYa operating mode are predefined and may not be modified. It is, in any
case, possible to exclude some of them via the buttons contained in 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;
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;
General water T timer see paragraph 3.4.1.1.1.3 on page 34 (optional);
Partial water T timer see paragraph 3.4.1.1.1.4 on page 35 (optional, Multi-DDC plants only).
Enabling the General water T timer substitutes the default water setpoint value set as per Paragraph
3.4.1.1.1.1 with the specific value for the timer cycle active at any given moment.
Once user settings have been programmed, it is possible to proceed to switch-on via the “Plant control“
menu.
Switching on plant in aRYW mode: Plant control
.
Before switching on the plant, ensure that all operating parameters have been correctly configured
(temperature set point, thermostating, differential, regulation parameters).
To access the “Heating/Cooling Plant control” menu, select
from the main menu.
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