Robur Direct Digital Controller, Installation, Use And Programming Manual

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Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013
99
4.4.2.6.6 Units use priority (Master DDC of plants with GAHP- GS/WS only)
The option present inside the installation menu allows to define the activation priority of the GAHP-GS/WS
units for every system managed by DDC in relation to other types of units belonging tot he same category
(Category 1). The units with the highest priority are switched on first and switched off last.
To set “ Machine use priority ”, 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 downward until highlighting “Base plant part” and press the knob.
7 - Turn the knob to scroll the cursor downwards until “Units Util.Preced” is selected, and press the knob to
access the screen.
8 - For chilled water production plants (left column of screen), position
the cursor on next to the units to which activation priority is to be
given (GAHP- GS/WS or “others”) and press the knob to confirm.
The symbol indicates that the units selected will have activation
priority.
For hot water production plants (right column of screen), position the
cursor on next to the units to which activation priority is to be given
(GAHP- GS/WS or “others”) and press the knob to confirm. The
symbol indicates that the units selected will have activation priority.
For two-line hot/cold plants, position the cursor on next to the units
to which activation priority is to be given (e.g. GAHP- GS/WS or
“
others ”) and press the knob to confirm. Effect the choice for heating
and cooling activation priority. The symbol indicates that the units
selected will have activation priority.
9 - To exit, select .
The GAHP- GS/WS unit is indicated with GAHP-W (W: water source)=.
In the table below, the order in which the plant decides to switch on the units is shown on the basis of the
choice made for machine use priority and for operating mode.
Cooling
Type GAHP-GS/WS GA ACF-HR GA-ACF GAHP-AR
Priority(1) 1
2
3 3
Priority(2) 3
1
2 2
NOTE