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Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013
83
•
as far as cold/hot inversion is concerned, enabling the BMS control allows this to be controlled via bus,
rather than by the
button on the Plant Control Panel. This button is therefore disabled and
appears thus
(cooling) or thus
(heating) according to the commands given via bus.
The YWAuto consent configuration however has priority over the BMS 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 BMS. Also in this case, the
button is disabled and appears thus
(cooling) or
(heating) according to the commands given by the contacts.
•
as concerns the change of heating/cooling operation priority of the GAHP-GS/WS modules, the choice
can be carried out with no difference either by DDC (see paragraph 2.4 "COOLING/HEATING
SERVICE ” on page 11) or by BMS; in this latter case the
button will get the appearance
corresponding to the choice made by the BMS (
priority to cooling;
priority to heating
mode).
If the cooling operation is set as priority, the GAHP-GS/WS modules can be switched on by the
conditioning plant regulator, but not by the heating plant regulator; vice versa if the heating
operation is set as priority.
RM plant control
By selecting “RM plant control” it is possible to carry out the same operations available for the previous option,
but with the procedures foreseen for the Remote Assistance (RM) and that essentially consist in ensuring the
possibility of having remote controls that already exists on the DDC, managing them in the equal way.
In this case, all the plant control option can be carried out with no difference by DDC or by RM.
Plant on/ff, hot/cold inversion and setting of operating priorities for the GAHP-GS/WS units can therefore by
done by DDC (see paragraph 2.4 “COOLING/HEATING
SERVICE
” on page 11) or via bus; when a
command is sent via bus, the corresponding button will take on the appearance corresponding to the setting
made via bus.
NOTE
NOTE
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