Direct Digital Controller
36 Direct Digital Controller fw 4.013 – Ed. 01/2013
Programming partial water T timer cycles
Programming of the partial water T timer cycles affects only plants managed by several Direct Digital
Controllers.
In this case, on the Master plant DDC it is possible to program the general water T timer cycles of the overall
plant and the partial water T timer cycles of all the units directly managed by the same Master DDC. On each
Slave DDC it is possible to program the partial water T timer cycles from that Slave DDC.
To program the water T timer cycles for a typical day, follow the instructions below.
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.
4 - Select “Plants” from the drop-down menu.
5 - Select the plant for which the partial water T timer cycles are to be programmed:
for two-line
cooling/heating plants,
for hot water production plants, or for chilled water production plants.
6 - Select “Water setup” from the drop-down menu.
7 - Select “Cooling” or “Heating” from the drop-down menu.
8 - Select “Group Water Timer” from the drop-down menu.
9 - Position the cursor on the activation time of the first water T timer cycle and press the knob. Turn the
knob to select the activation time of the first timer cycle and press the knob to confirm. The cursor moves
automatically to the deactivation time of the first timer cycle. Proceed in the same way to program the
deactivation time of the first timer cycle.
10 - The cursor moves automatically to
for the activation of the timer cycle programmed. Press the knob to
enable the timer cycle. The
symbol indicates that the timer cycle that has just been programmed has
been enabled.
11 - Proceed in the same way, repeating steps 1-3 for the programming of any further timer cycles required.
12 - Once the desired timer cycles have been programmed, it is possible to pass to the following day by
selecting the arrow at the top right
. The previous day’s program may be copied for the current day by
selecting
, or the water T timer cycles required for the new day may be programmed.
13 - To exit, select
.
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