Direct Digital Controller
82 Direct Digital Controller fw 4.013 – Ed. 01/2013
4.4.1.18 Software Update (for authorised Technical Assistance Centres only)
By connecting to the Personal Computer, this updates the DDC software. The operation may be carried out
only by qualified ROBUR personnel or authorised Technical Assistance Centres.
4.4.2 PLANTS
Select “Plants” from the drop-down menu, then select the plant. The options available in this menu are:
4.4.2.1 BUS access setup
4.4.2.2 Water pump mode (Master DDC only)
4.4.2.3 Partial operation mode (Master DDC of Multi DDC plants only)
4.4.2.4 Alarm output setup
4.4.2.5 Split plant part
4.4.2.6 Base plant part
4.4.2.1 BUS access setup
It permits to enable the access by bus to the plant control and to the possibility of modifying the plant operation
parameters.
Enabling the plant control allows you to operate the On/Off commands, invert the Cooling/Heating and change
the GAHP-GS/WS priorities, in two different ways.
Enabling the modification of functioning parameters allows you to operate on set point, differential, and
general water T timer cycle.
The foreseen control options are two:
- BMS control (Building Management System)
- Remote Assistance Control (RM)
These options can be set separately for every plant and they exclude each other.
On the contrary, the parameter access option is unique and it makes no difference between BMS and RM.
BMS plant control
By selecting “Control BMS plant” via the bus it is possible to switch the plant on and off, invert the hot and cold
(in 2-line hot/cold plants), and with 4-line GAHP-GS/WS units, change the switch on priorities, with the rules
laid down for Building Management Systems (BMS).
The procedures are as follows:
• as concerns the switching on/off, a new switch is added in series to the already existing ones. The
status of this switch can be varied only by BMS. The switching on of the plant is carried out only if all
the switches are ON (closed) (see Figure 20 page 108).
Do not enable the BMS control if the switching on/off is not effectively managed via bus; the
additional switch status is initially OFF, so if the switch is not managed it is not possible to switch
the plant on.
WARNING
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