Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013 103
On/off command configuration
The on/off commands that determine switch-on of the plant for the cooling and heating services may be
considered as switches in series inside the DDC. The plant may be switched on only if all the enabled on/off
commands are ON (closed). If the plant is on (“ON” displayed in the main screen), one or more units will be on
only when the condition for water thermostating is not met (water temperature different from that of the set
point set). Figure 19 illustrates this screen.
Figure 19 – EXAMPLE OF SCREEN IN ON/OFF COMMAND CONFIGURATION MENU
With the exception of the “General switch” consent, all the consents described below affect ONLY
the generation of requests by DDC not by Robur Box (RB 100 or RB200).
A description of each on/off command is given below, with the aim of aiding the installation technician in
selecting the most suitable operating mode (e.g. CUSTOM).
On/off command for the main power switch of the plant for both Single DDC and Multi DDC plants.
The symbol indicates that the command is enabled and means that the
button in the
“Plant control” menu is enabled.
This symbol indicates that the on/off command is disabled and means that the button in the “Plant
control” menu is disabled (
= button disabled and on/off command set to always ON).
For CUSTOM operating mode it is possible to decide whether to enable the command or not:
1 - To enable the command, turn the knob to position the cursor on
and press the knob. The
symbol indicates that the command is enabled, and so the corresponding button in the “Plant
control” menu will be enabled.
2 - To disable the command, turn the knob to position the cursor on and press the knob. The
symbol indicates that the command is disabled, and so the corresponding button in the “Plant
control” menu will be disabled (
).
B
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