Direct Digital Controller
124
Direct Digital Controller fw 4.013 – Ed. 01/2013
4.5 INSTRUCTIONS
FOR
DDC-PLANT CONFIGURATION
4.5.1 INTRODUCTION
The DDC has been conceived to control up to a maximum of 96 modules (i.e. a maximum of 48 cold modules
and 48 hot modules). In order to obtain this functionality, a modular architecture has been adopted, on the
basis of which:
one DDC is able to control directly up to a maximum of
32
modules (
16
cold modules and
16
hot modules)
(see Paragraph
4.5.2.1
– “Single DDC configuration”
);
two
DDCs
may be coordinated to manage up to 64 modules (32 “cold” m 32 “hot” modules) (see
Paragraph
4.5.2.2 – “Multi DDC Binding”
);
three
DDCs
may be coordinated to manage up to 96 modules (48 “cold” m 48 “hot” modules);(see
Paragraph
4.5.2.2
– “Multi DDC Binding”
).
In addition, each DDC can manage units configured on two different plants, on condition that they are a “hot”
plant and a “cold” plant. This functionality is provided to allow a single DDC to manage four-line hot/cold
plants.
Alternatively, one DDC can manage a single two-line hot/cold plant (or, naturally, a single hot or cold plant).
Plants are identified by an ID; there may be 6 plant IDs (0-15). These IDs are assigned to the units via the
user interface of the S61 board, in a way that is consistent with the water plant to which they are linked. For 4-
line machines, two plant IDs must be assigned, one for the cold module and one for the hot module (this
applies to AYF 60-119/4 units and GAHP- GS/WS units in a 4-line configuration).
The DDC can support also the domestic hot water control. In particular on a plant the DDC is able to manage
the production of domestic hot water with units belonging to the base plant (base DHW: uses the same
heating units for the production of domestic hot water at the same time as the production of hot wter for
heating), or with units belonging to the separable plant (separable DHW: a part of the plant can be separated
from the base plant to product domestic hot water completely independently and not at the same time as the
heating system, therefore also when this is working in cooling mode).
To make use of this functionality, the plant shall be provided with an interfacing device called RB100 or RB200
(Robur Box), of which use is made to send to the DDC the switching on/off requests of the configured units.
The Direct Digital Controller can communicate with other Direct Digital Controllers of the same type in order to
manage plants with more than 16 units. In addition, it is possible to allow more Direct Digital Controllers to be
used also if there are less than 16 units, i.e. if there are several groups of machines serving the same plant but
which need to be managed autonomously.
Instructions for carrying out both Single DDC and Multi DDC configurations follow.
Before carrying out the DDC-Plant configuration, ensure that all connections have been made correctly and
that the machine’s electronic boards have been configured correctly (see S61 electronic board programming
sheet).
DDC-Plant configuration is basically carried out in two stages:
The first stage is represented by the configuration of the DDC/DDCs of the plant. In this stage the
DDC/DDCs acquire information about the machine that they must manage or about any other DDCs
installed;
The second stage concerns the configuration of the plant/plants, which must be carried out on each DDC
installed. This is the stage during which it is possible to choose the operating mode or modes of the plant or
plants.
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