Direct Digital Controller
42 Direct Digital Controller fw 4.013 – Ed. 01/2013
2 - Select to access the “User settings” menu.
3 - Enter, if requested, the user password on the numerical keypad that appears on the display.
4 - Select “Plants” from the drop-down menu.
5 - Select the appropriate icon:
for two-line cooling/heating plants, for hot water production
plants, or
for chilled water production plants.
6 - Select “Ambient Setup” from the drop-down menu.
7 - Select “Differential” from the drop-down menu.
8 - Position the cursor on the value to modify (Cooling or Heating).
9 - Press the knob to allow the change of the selected value.
10 - Turn the knob to modify the differential value.
11 - Press the knob to confirm the set value.
12 - To exit, select
.
The recommended values for the ambient temperature differential are 1°C (1,8°F) for cooling and –1°C (-
1,8°F) for heating.
3.4.1.2.2 Chronothermostat set points
Up to 3 temperature levels may be programmed.
The 3 temperature levels refer to the air temperature in the environment
to be cooled or heated.
NOTE: T1 corresponds to the minimum service level (lower temperature
in heating mode, higher temperature in cooling mode)
consequently it is possible only to set values that respect these
conditions (heating: T1 ≤ T2 ≤ T3; cooling: T3 ≤ T2 ≤ T1).
Programming chronothermostat set points
This option allows the user to set three ambient temperature values for operation in COOLING mode and
three ambient temperature values for operation in HEATING mode. These values can then be selected and
used when programming the ambient chronothermostat.
Instructions for setting the three temperatures follow.
1 - Select
from the initial screen to gain access to the main menu.
2 - Select
to access the “User settings” menu.
3 - If requested, enter the user password on the numerical keypad that appears on the display;
NOTE
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