Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013 101
4.4.2.6.8 Cool/Heating inversion valve parameters
This parameter shall be set in case use is made on the base plant of three-way centralised deviation valves for
the plants switching over (inversion from cooling to heating and vice-versa).
This parameter indicates the maximum time that the three-way valves can take to switch over from one
position to the other. In case of valves with auxiliary contacts, if the valve has not reached the preset limit
switch in this period of time, an error is generated (for further information see the error list ). In case of valves
not provided with these contacts, after this time has elapsed, the DDC assumes the switching-over step is
over.
To set above-said value, operate as described below:
1 - Select
from the initial screen to gain access to the main menu.
2 - Select
to gain access to the System installation.
3 - If required, enter the installer password on the numerical keypad that appears on the display.
4 - Select “Plants” from the drop-down menu.
5 - Select the plant:
for two-line cooling/heating plant; for the hot water production plant; for
the chilled water production plant.
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 Vlv Prms” and press the knob.
8 - Place the cursor on the value to be edited; the value is expressed in seconds.
9 - Press the knob to allow the change of the selected value.
10 - Turn the knob to modify the value. The value can be set from 0 to 600 seconds.
11 - Press the knob to confirm the set value.
12 - To exit, select
.
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