Direct Digital Controller
138 Direct Digital Controller fw 4.013 – Ed. 01/2013
Group ON/OFF switch. Button disabled (always ON) for plants managed by a single DDC.Turn the
knob to position the cursor on the button and press the knob to enable it (ON/OFF button
symbol in the ON position
). If in the OFF position, it allows all the machines managed by the
specific DDC to be switched off.
Button for enabling/disabling General water T timer (
the command is disabled in AmbT
operating mode).
Button for enabling/disabling Partial water T timer. (the consent is disable din the AmbT operating
mode
).
Chronothermostat activation/deactivation button. To activate the chronothermstat, position the
cursor on the button and press the knob (symbol of the “Chronothermostat” consent active
).
COOLING/HEATING switching button - two-line hot/cold plants only (
COOLING,
HEATING).
To access the “DHW Plant control” menu, follow the indications given below:
1 - Select the icon from the initial screen and press the knob to gain access to the screen displaying the
operating parameters of base and separable DHW plant.
2 - Select the
symbol positioned above to gain access to the “Base DHW plant control” menu”.
3 - Select the
symbol positioned below to gain access to the “Separable DHW plant control” menu”.
4 - In both cases (“Base DHW plant control” and “Separable DHW plant control”) the screen shown in the
figure below will be displayed on the screen.
The figure shows the screen of the “DHW plant control” menu and the
relevant button described below.
Main ON/OFF switch. Turn the knob to position the cursor on the button and press the same to
activate it (symbol of the ON/OFF button in the ON position
). In case of Multi-DDC plant, it
is ON only on the Master DDC; on the Slave DDC(s) it reflects the ON/OFF status set on the Master.
The plant may be activated only if either of the following conditions applies:
The main ON/OFF switch and at least one of the partial ON/OFF switches are in the ON position, the
chronothermostat is active and the ambient temperature does not correspond to that set;
OR the main ON/OFF switch and at least one of the partial ON/OFF switches are in the ON position, and
the chronothermostat is not active. In this operating mode, activation and deactivation are performed
manually, i.e. not automatically via ambient thermostating.
4.5.3.1.5 Instructions for operation in ExtT mode
In the “ExtT” operating mode, the ON – OFF operating command of the units is determined by comparing the
average external ambient temperatures (calculated by means of the temperature sensors present on all units)
with the external temperature value set; for two-line hot/cold plants COOLING or HEATING mode are selected
manually by the user via the “Plant Control” menu
on the Digital Controller using the icon in the
menu.
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