102/118
Siemens Building Technologies Basic Documentation RVL471 CE1P2524E
HVAC Products 28 Handling 23.10.2002
3 buttons are used for manual operation:
• One button for the activation of manual operation. An LED indicates manual operation.
Manual operation is quit by pressing the same button again or by pressing any at the
operating mode buttons
• 2 buttons for manual positioning commands.
In plants using mixing valves, the regulating unit can be driven to any position by
pressing the respective button .
In plants with direct burner control, burner stage 2 can be switched on and off by
pressing button
.
When pressing a button, the associated LED is lit.
The LEDs by the symbols
and indicate the positioning commands:
= mixing valve in heating circuit fully OPEN or first burner stage ON
= mixing valve in heating circuit fully CLOSED or second burner stage ON
The LED beside the pump symbol is lit as soon heating circuit pump / circulating pump
M1 runs, that is, whenever the heating operates.
28.1.3 Digital operating elements
The entry and readjustment of all setting parameters, the activation of optional func-
tions and the reading of actual values and statuses are based on the operating line
principle. An operating line with an associated number is assigned to each parameter,
each actual value and each optional function.
The selection of an operating line and readjustment of the display is always made with
a pair of buttons.
To select and readjust setting values, the procedure is the following:
Buttons Procedure Effect
Line selection buttons Press button Selection of the next lower operating line
Press button Selection of the next higher operating line
Setting buttons Press button Decrease of the displayed value
Press button
Increase of the displayed value
The value set will be adopted:
• when selecting the next operating line
• by pressing the Info button
• by pressing any of the operating mode buttons
If the entry of --.- or --:-- is required, button
or must be pressed until the re-
quired display appears. Then, the display maintains --.- or --:--.
The operating lines are grouped as blocks. To reach a specific operating line of a block
quickly, the other blocks can be skipped, so that it will not be necessary to select all the
other lines one by one. This is accomplished by using two combinations of buttons:
Procedure Effect
Keep depressed and press
Selection of the next higher function block
Keep depressed and press
Selection of the next lower function block
The Info button is used to obtain basic information about the plant. Pressing this button,
the cursor
in the display is placed below the required symbol. The numbers on the
display have the following meaning:
Buttons and displays for
manual operation
Display of positioning
commands
Display "Heating oper-
ates"
Operating line principle
Buttons
Block skip function
Info button
To Next Page
Loading...
