Direct Digital Controller
38
Direct Digital Controller fw 4.013 – Ed. 01/2013
Base plant timer programming
Figure 8 shows as the DDC display appears when programming the base plant water T timer cycles.
Figure 8
–
SCREEN FOR THE PROGRAMMING OF THE BASE PLANT T TIMER CYCLES
In case of plants managed by several DDC, the programming of the water T timer cycles can be carried out
only by the DDC defined as Master.
In order to program the switching-on 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 “Domestic hot water” from the drop-down menu.
8.
Select “Base plt wat 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. Set the water set-point temperature for the programmed timer cycle. Press the knob to modify the
temperature value once the cursor is positioned on the number. Turn the knob to modify the value. Press
the knob to confirm.
11. 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. NOTE: a water T timer cycle may be disabled at any moment by pressing . The
symbol indicates that the water T timer cycle programmed has been disabled.
12. Proceed in the same way, repeating steps 9 – 10 - 11 for the programming of any further timer cycles
required.
13. 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.
KEY:
A
Programming of base DHW system timer cycles;
B
T timer cycle switching –on time
C
Water T timer cycle switching-off time
D
Symbol identifying that the system for which the T timer cycles are
being programmed is the domestic hot water system
E
Day for which water T timer cycles are being programmed
F
Scroll arrows to change day
G
Button for copying previous day’s settings to current day
H
Checkbox for
activation of programmed water T timer cycle
I
Setpoint temperature for the programmed period
L
Text describing the function highlighted by the cursor
M
Activation/deactivation times of water T timer cycles
D
F
H
M
I
A
F
E
G
C
B
L
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