Direct Digital Controller
126 Direct Digital Controller fw 4.013 – Ed. 01/2013
If at least one unit belonging to the separable group is present on the plant, the configuration shall
be completed following the indications provided in paragraph 4.4.2.5.1 “Heating/DHW Select” on
page 87. and in paragraph 4.4.2.6.10 “Heating/DHW select” on page 119 (if at least one hot unit
belonging to the base group is present).
When this configuration stage has been completed, proceed to Paragraph 4.5.3– “PLANT CONFIGURATION
INSTRUCTIONS”, where the operating mode of the plant can be defined.
4.5.3 PLANT CONFIGURATION INSTRUCTIONS
4.5.3.1 Configuring operating mode
The first operation to carry out is the selection of the operating mode described in Paragraph “On/off
command configuration” on page 103.
The Direct Digital Controller allows 6 management modes regarding operation of the units, as indicated in the
table below.
OPERATING
MODE
MANUAL
(MAN)
RYWm
RYWa ExtT AmbT WCmp MON CUST
Global On-Off
X
X X
X
X
*
Partial On-Off
X X X X X
*
Global water T
timer
X X
X X
X
*
Partial water T
timer
X X X X
X
*
External
Temperature
X
X
X
*
Chronothermostat
X X
*
Climatic curve
X
X
*
RY-RW
X
X X
*
AutoYW
X X
*
X
*
In CUSTOM operating mode it is possible to select freely the ON/OFF commands that determine the
activation of the plant. It is not possible to select the "WeComp" function at the same time as the
“GenTmr” or “ChronT” consent..
Multi DDC plants only.
Two-line hot/cold plants only.
4.5.3.1.1 Instructions for operation in MAN mode
In MAN mode, activation and deactivation of the plants, switching from COOLING to HEATING mode and vice
versa for two-line plants is performed manually by the user via the Direct Digital Controller that can in addition
attend to the management of switch-on and switch-off times, the regulation of the water temperature, the
management of timer operating cycles and diagnostics of the units connected.
Consent for the activation or deactivation of the plant is provided manually through configuration of the “Plant
control” menu
.
WARNING
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