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Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013
107
This on/off command is present
on master and slave DDC
in RYWm and RYWa operating
modes, or if selected in CUSTOM mode.
The status of the commands is directly correlated to the
status of the external RW - RY contacts on the rear of the DDC. For further details regarding the
meaning of RW and/or RY, see Paragraph 4.5.3.1.2 - “Instructions for operation in mRYW mode”. In all
other cases, i.e. when the commands are not enabled, it is in the ON state.
The symbol indicates that the RY and RW commands are enabled.
The symbol indicates that the commands are disabled (commands always present: switches closed).
For CUSTOM operating mode it is possible to decide whether to enable the commands or not:
1 - To enable the commands, turn the knob to position the cursor on , and press the knob. The
symbol indicates that the commands are enabled.
2 - To disable the commands, turn the knob to position the cursor on , and press the knob. The
symbol indicates that the commands are disabled.
The RY command is in the OFF state (switch open) if, with RYWm mode selected, the RY contact is
open. The RY command is in the OFF state (switch open) if, with RYWm mode selected, the RW contact
is open.
The command, for the cooling plant, is ON (switch closed) in the following cases:
1 - The
command is enabled ( ) and the RY contact is closed.
2 - The
command is disabled ( ).
The command, for the heating plant, is ON (switch closed) in the following cases:
3 - The
command is enabled ( ) and the RW switch is closed.
4 - The
command is disabled ( ).
NOTE
: RY and RW consents act on the single DDC (master or slave) on which they are configured; in
multi-DDC systems this allows to selectively give consent to one or more DDCs from the outside.
Only for 2-line hot/cold plants and only for the plant master DDC:
this is present in RYWa mode or,
if selected, in CUSTOM mode
;
: if enabled, it specifies that the cooling/heating commutation is automatic
according to the request on the RY - RW contacts (RY closed: commutation in cooling; RW closed:
commutation in heating); If disabled
it specifies that the cooling/heating commutation is done
manually using the plant control menu button
or via Bus.
The symbol indicates that the function is disabled:
•
if the “BUS plant control” is selected in the “BUS access configuration” menu, the cooling/heating
switching-over is managed by the access to the BUS in BMS mode (
button disabled in plant
control menu);
•
otherwise it is managed manually (
button enabled in plant control menu); moreover, if the “RM
plant control” option is selected in the “BUS access configuration” menu”, the switching-over can be
carried out also via BUS in RM mode.
The
symbol indicates that the function is enabled and ALWAYS implies that the button is disabled
(
) in the Plant control menu (automatic cooling/heating switching according to the state of the RY
and RW contacts).
For CUSTOM operating mode it is possible to decide whether to enable this function or not:
1 - To enable the function, turn the knob to position the cursor on and press the knob.
2 - To disable the function, turn the knob to position the cursor on and press the knob.
If
is enabled, and the RW and RY contacts are both closed, an error is generated and the plant
switched off.
NOTE
: in CUSTOM mode, enabling the YWAuto does not necessarily require the enabling of consents
RY-RW; it is therefore possible to obtain a configuration in which the RY and RW contacts are used only
for the cooling/heating commutation, but not as consents to switch the plant on.
For further information about the “Plant control” menu, consult Paragraph 2.4 – “PLANT CONTROL MENU” on
page 11.
The consents can be represented as serial switches, as indicated in Figure 20 on page 108; The example
represents the Custom operation mode with all the available consents. The BMS On-Off switch is managed
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