Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013 5
Separable/separate group: set of generators on the separable/separate plant part.
Plant ID: identification number between 0 and 15, set by a specific parameter in the Robur generators to
indicate that they belong to a given plant, understood as the hydraulic circuit they are connected to. One or
more plant IDs (cold plant ID and/or hot plant ID) must be set on the RB200 device if this manages third party
generators.
NOTE
: The plant ID does not vary between the base and separable/separate plant parts. To indicate on
which part of the plant a Robur generator is found we use another parameter to be set on it (group to
which the unit belongs); to indicate on which part of the plant a Third Party generator managed via an
RB200 device is found, we use a parameter to be set on that device.
The RB100 and RB200 devices are used to interface requests for different types of services from one or more
external control systems with the DDC.
The inputs for the service requests available on each RB100 and RB200 interface device are the following:
Cooling service request: when this input signal is enabled, the equipment sends a request to the DDC so
that the latter can drive the switching on of the cold modules present on the plant and can manage them in
order to meet the request appropriately;
Heating service request: when this input signals is enabled, the equipment sends a request to the DDC so
that the latter can drive the switching on of the hot modules present on the plant and can manage them in
order to meet the request appropriately;
DHW0 and DHW1 service request: when one of these input signal is enabled, the equipment sends a
request to the DDC so that the latter can drive the switching on of the hot modules present on the plant and
can manage them in order to meet the domestic hot water request appropriately. In particular, each of these
inputs can be configured to make separable or base domestic water requests; it is also possible to enable both
inputs and therefore manage two DHW service requests at the same time.
The basic DHW service is normally used to provide a DHW service at circuit temperatures that are compatible
with Robur GAHP high efficiency heat pumps.
The separable or separate DHW service is normally used to provide a DHW service (complete or integrating
the base DHW service) which requires higher circuit temperatures, which are not compatible with the GAHP
heat pump units, therefore delivered by conventional heat generators (boilers) installed on the separable or
separate part of the plant.
RB100 and RB200 devices can also control the three-way valve used to hydraulically separate the separable
plant part from the base part.
Control of alternate hot/cold 2 line production plant with generation side or 4-line user side manifolds
Using the RB100 or RB200, the DDC is also able to control a three-way valve used to hydraulically commute
the plant for operation in either heating or cooling. The valve is useful in the following two cases:
• Plant with two line generation (for example in the case of GAHP-AR units) and distribution to four-line
services (for example underfloor heating and fan coil cooling).
• Plant with four line generation (use of only cold and only hot units mounted on separate manifolds) and
distribution to two-line services (for example heating and cooling both served by the same fan coils).
NOTE
: installation of only cold or only hot units on separate manifolds is not compulsory, but can be done
for specific reasons: for example, during the summer to allow the production of domestic hot water with
heat pumps and at the same time the production of cold water for cooling.
NOTE
: RB100 has only one valve control output, while RB200 has two outputs. Therefore, if you need to
manage both the separation valve and the cooling/heating commutation valve using an RB100 device, you
will need two; if you use the RB200 on the other hand, you will need only one device.
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