Robur Direct Digital Controller, Installation, Use And Programming Manual

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Direct Digital Controller
64
Direct Digital Controller fw 4.013 – Ed. 01/2013
boiler of this type is assigned to a category, the switch off delay is the same for all the water pumps of these
boilers.
Delivery and return limit temperature
For category 1 only, destined for heat pumps, these parameters may also be present. In particular, the
parameters will be present in the event of using the "complement and substitution" operating mode with the
auxiliary boilers. For details on the meaning of these parameters, refer to paragraph 4.2 - DESCRIPTION OF
AUXILIARY BOILER OPERATING METHODS FOR HOT SERVICE ON BASE PLANT PART on page 55.
Auxiliary regulator parameters for "Progressive complement and substitution" mode
For category 1 only, destined for heat pumps, these parameters may also be present. In particular, the
parameters will be present in the event of using the "progressive complement and substitution" operating
mode with the auxiliary boilers. For details on the meaning of these parameters, refer to paragraph 4.2 -
DESCRIPTION OF AUXILIARY BOILER OPERATING METHODS FOR HOT SERVICE ON BASE PLANT
PART on page 55.
Setting the parameters
For the description of the setting operations of the parameters, refer to the paragraph 4.4.2.6.4 "Regulation
parameters" on page 96 relative to setting the basic system part.
4.3.2 DOMESTIC HOT WATER (DHW) SERVICE
DHW service on the basic system part
Regarding the “base” DHW service, i.e. supplied at the same time as the heating service and on the same
pipes, the regulation is identical to that described previously for the heating service and uses the same values
as the parameters.
DHW service on the separable system part
For the DHW service supplied on the pipes on the separable part of the plant, the regulation algorithm is
identical to that described for the heating system. In this case, however, parameters are used that are
dedicated to allow differentiation of the regulation. To set these, refer to the 4.4.2.5.4 “Regulation parameters”
paragraph on page 89 relative to the settings of the separable system part.
The default values of the
parameters are identical to those of the basic system part.
In this case the Delivery and return limit temperature and Auxiliary Regulator parameters are never present
for the "Progressive complement and substitution" mode as the "complement and substitution" operating
mode of the auxiliary boilers is not foreseen on the separable plant part.
4.3.3 CONDITIONING OPERATION
General description
The algorithm used to regulate the temperature of the water is identical to that of the heating mode, except for
inversion of the logic, thanks to which the stages are switched on when the temperature is higher than the
objective and off when lowered. Therefore, for a description of the algorithm, refer to the 4.3.1 “Heating
service” paragraph on page 57.
The “
Water differential ” parameter also exists in cooling mode, with default value = 2°C (3,6° F) and with the
same meaning described for the heating mode.
Categories of machines and parameters default values
For the conditioning service, the following categories are defined:
•
Category 1
The cold modules of all current Robur heat pumps and chillers are assigned to this category.
•
Categories 2 and 3
These categories are reserved for future Robur products.
•
Categories 4 - 7
Any third chillers can be assigned by the installer to these categories. For setting instructions refer to
Table 4 on page 65.
NOTE