Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013 113
Figure 23 – EXAMPLE OF SELECTION OF A HEATING CURVE ON THE BASIS OF THE RATED TEMPERATURE
Limitation of the water temperature range of variation.
Often it is good practice to limit the effective travel accepted of the water temperature, with respect to that
corresponding to the entire variation range of the external temperature, which should be derived just from
the calculation with climatic curve. This can be performed by accessing the menus Maximum water
setpoint (page 116) and Min water set-point (page 117).
Instructions for setting the climatic curve parameters:
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 downward until highlighting “Cool/Heat. serv. Conf.”.
Curve for internal environment
T = 20 °C (68° F)
External environment T
Water T
°F
212
194
176
158
140
122
104
86
68
68 50 32 14 -4 -22 °F
NOTE
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