Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013 117
13 - To exit, select .
If the DDC is the Master DDC for two plants, repeat steps 5 to 9 for the second plant.
Min water set-point
The option present inside the installation menu allows to define the minimum limit of the set-point
temperatures (flow and return) for cooling and heating on the base part of the system. The set-point
temperatures will be set subsequently by the user by means of “User settings” Menu. In particular, the user
can define the maximum temperatures for the production of chilled water in the field from -30°C to +40°C (-22°
F to +104° F) and the minimum temperatures for the production of hot water in the field from +5°C to +95°C
(+41° F to +203° F). For instance, should a value of +30°C (+86° F) be set for a chilled water production plant,
the user can define a temperature value lower than +30°C (+86° F). In case of hot water production plant, the
setting of a temperature value equal to +40°C (+104° F) will allow the user to choose a hot water set-point
value ranging exceeding +40°C (+104° F).
Moreover, if the climatic curve function is active, these limits are applied to the set-point determined by the
system depending on the external temperature. In the example for heating systems given above, the minimum
set-point temperature of the water will be 40°C (+104° F) even if the climatic curve function should request a
lower value.
NOTE
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