Direct Digital Controller
84 Direct Digital Controller fw 4.013 – Ed. 01/2013
The YWAuto consent configuration however has priority over the RM control, so if both are
enabled, the system manages the hot/cold inversion using the RW and RY contacts and ignores
the requests from the RM system. In this case, the
button is disabled and appears thus
(cooling) or
(heating) according to the commands given by the contacts.
After enabling the RM control, if the consent configuration inhibits the global On/Off switch, this
control will be shown in reading-only mode on the DDC but it can be modified by remote
assistance, therefore operating on the plant consent.
Plant parameters
By selecting “Plant parameters” it is possible to set via bus the set point, differential, general T timer cycles via
bus, via BMS or RM.
4.4.2.2 Water pump mode (Master DDC only)
This option, in the “System installation”, allows the management mode of the water pump(s) installed on the
plant/plants to be defined.
Two operating modes are available:
Common water pump: in this case a single water pump is installed for the plant; the water flow
circulating in the plant is always the same.
Independent water pump: in this case a water pump is installed for each unit; the total number of water
pumps is the same as the number of units installed. In this case the water flow circulating in the plant is a
function of the number of units that are on.(Each water pump is on when the corresponding unit is on).
To set “Water pump mode”, follow the instructions below:
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, if requested, on the numerical keypad that appears on the display.
4 - Select “Plants” from the drop-down menu.
5 - Select the
symbol for two-line cooling/heating plants, for hot water production plants, or
for chilled water production plants.
6 - Turn the knob to scroll the cursor downwards until “Wat.Pump Op.Mode” is selected, and press the knob
to access the screen.
7 - Position the cursor on
next to the option to be set (Plant Single Pump or Unit Pumps) and press the
knob to make the selection. The symbol indicates that the option has been enabled .
8 - To exit, select
.
NOTE
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