Robur Direct Digital Controller, Инструкция по установке, использованию и программированию

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Direct Digital Controller
116
Direct Digital Controller fw 4.013 – Ed. 01/2013
Maximum water setpoint
The option present inside the installation menu allows to define the maximum limit of the set-point
temperatures (flow and return) for cooling and heating on the base part of the system. The set-point
temperatures will be set subsequently by the user by means of “User settings” Menu. In particular, the user
can define the minimum temperature for the production of chilled water in the field from –30°C to +40°C (-22°F
to 104° F) and the e maximum temperatures for the production of hot water in the field from +5°C to +95°C
(+41° F to +203° F). For instance, should a value of +5°C (+41° F) be set for a chilled water production plant,
the user can define a temperature value upper than +5°C (+41° F). In case of hot water production plant, the
setting of a temperature value equal to +60°C (+140° F) will allow the user to choose a hot water setpoint
value lower than +60 °C (+140° F). Moreover, if the climatic curve function is active, these limits are applied to
the set-point determined by the system depending on the external temperature.
In the example for heating systems given above, the maximum set-point temperature of the water will be
+60°C (+140° F)even if the climatic curve function should request a higher value.
The set-point limits for the thermostating on delivery and return are set separately.
To modify the set-point limits, follow the instructions below:
1 - Select from the initial screen to access the main menu.
2 - Select to access the “installation menu”.
3 - Enter the installer password 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 srv.Conf.” and press the knob.
8 - Turn the knob to scroll the cursor downward until highlighting “Max water set-point” and press the knob.
9 - Position the cursor on the temperature value to be modified.
10 - Press the knob to allow the change of the selected value.
11 - Turn the knob to modify the value.
12 - Press the knob to confirm the set value.