Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013 121
If the DDC is the Master DDC for two plants, repeat steps from point 5 for the second plant
Heat/DHW setpoint priority
This parameter permits to set of which setpoint value use shall be made for the operation of the base plant
units in case several switching-on requests are present. In particular, the choice of the reference setpoint will
be assessed by the plant among the setpoint requests for the base DHW service and the setpoint requests for
the heating service. It is important to remember that more requests of the same type can be obtained from
both the DDC and one or more RB100 or RB200 devices.
By selecting the “Max. DHW request setpoint” option, the DDC will consider the maximum value of all the base
domestic hot water requests as reference setpoint for the plant management. Should both base DHW and
heating requests exist, the setpoint utilized by the system will be the one relative to the DHW request
specifying the highest setpoint value. In case only heating requests are present (and not base DHW request)
the utilized setpoint will be the highest one among all the heating requests.
By selecting the “Max. Heat./DHW request setpoint” item, the DDC will consider the maximum value of both
base DHW and heating requests as the setpoint of which use shall be made for the plant management.
1 - Select
from the initial screen to gain access to the main menu.
2 - Select
to gain access to the System installation.
3 - Enter the installer password on the numerical keypad that appears on the display.
4 - Select “Plants” from the drop-down menu.
5 - Select the plant type:
for two-line cooling/heating plant; for the hot water production plant;
for the chilled water production plant.
6 - Turn the knob to scroll the cursor downward until highlighting “Base plant part” and press the knob.
7 - Turn the knob to scroll the cursor downward until highlighting “Base DHW serv.Conf.” and press the knob
8 - Turn the knob to scroll the cursor downward until highlighting “Heat/DHW Setp Prio”.
9 - Position the cursor on
next to the option that is to be set.
10 - Press the knob to activate the option. The
symbol indicates that the option has been enabled .
11 - To exit, select
.
NOTE
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