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Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013
141
The plant may be activated only if either of the following conditions applies:
The main ON/OFF switch and at least one of the partial ON/OFF switches are in the ON position, the water
T timer is enabled, the water T timer cycle is active at that moment and the external ambient temperature
does not correspond to the temperature set is lower (heating) or higher (cooling) than the external
environment set-point set (see paragraph 3.4.1.3.1
Set point
on page 46).
The main ON/OFF switch and at least one of the partial ON/OFF switches are in the ON position, the water
T timer is disabled and the external ambient temperature does not correspond to the temperature set is
lower (heating) or higher (cooling) than the external environment set-point set (see paragraph 3.4.1.3.1
Set
point
on page 46).
4.5.3.1.6 Instructions for operation in WCmp mode
In the
“WCmp”
operating mode, the water temperature is determined depending on the external temperature
and the climatic curve; for 2 pipe hot/cold plants the functioning selection in COOLING MODE or HEATING
MODE is carried out manually by the user via the“Heating/Cooling Plant Control”
menu of the Digital
Panel via the icon
present within the same menu.
In cooling mode, the temperature of the water lowers on increase of the external temperature and rises when
the same falls.
In heating conditioning mode, the temperature of the water rises on decrease of the external temperature and
lowers when the same rises.
For functioning in WCmp mode, the connection of a temperature probe to the outside of the environment to be
heated and/or cooled is recommended.
The external temperature probe must be connected to the relevant clamps present in the rear part of the
Digital Panel (see ).Figure 31
If an external temperature probe is not installed, the functioning of the machines will be managed
depending on the average of the temperatures detected by the machine probes.
Figure 31 –
EXAMPLE OF EXTERNAL TEMPERATURE PROBE CONNECTION FOR WCmp MODE
1 2 3 4 5 6
ddc
EXTERNAL AMBIENT
TEMPERATURE SENSOR
T
NOTE
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