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Siemens Building Technologies
Basic documentation RVD240
CE1P2384en
HVAC Products
25 Function block Test and display
27.05.2004
If pulses are received at H5 (e.g. pulses for limiting the volumetric flow through heat
meters), the number of pulses received per minute will be displayed.
Only entire pulses can be displayed. The display shows pulses/min; the measurement
range is 0...2250 pulses/min.
The display shows
H5
and the measured value.
If a radio clock receiver is connected to the data bus (LPB), the RVD240 can receive
the radio signals via data bus. On operating line 165, it is possible to see how much
time has elapsed (hh:mm) since the radio clock receiver received the last correct time
telegram.
The display shows
r c l
(Radio Clock) and
hh:mm
. If no valid value is available, the
display cannot be selected. The reason can be one of the following:
•
No radio clock receiver connected
•
Controller has no data bus address
•
Connection interrupted
25.7 Limitations
Active limitations are displayed on operating line 169. Interrogation is made with the
setting buttons
and
. Each limitation is assigned a code and the respective limita-
tion symbol.
Code Symbol Type
of
limitation
Limited variable
1
Maximum
Volumetric flow or output, common flow
2
Maximum
Common primary return
3
Maximum
Temperature differential (DRT), common flow
4
Maximum
Common secondary flow
5
Maximum
Volumetric flow or output, heating circuits**
6
Maximum
Primary return heating circuit 1
7
Maximum
Secondary return heating circuit 1
8
Maximum
Temperature differential (DRT) heating circuit 1
9
Maximum
Secondary flow heating circuit 1
10
Maximum
Room temperature heating circuit 1
11
Maximum
Flow temperature rise heating circuit 1
12
Maximum
Primary return heating circuit 2
13
Maximum
Secondary return heating circuit 2
14
Maximum
Temperature differential (DRT) heating circuit 2
15
Maximum
Secondary flow heating circuit 2
16
Maximum
Room temperature heating circuit 2
17
Maximum
Flow temperature rise heating circuit 2
18
Maximum
Primary return d.h.w.
19
Maximum Secondary
return
d.h.w.
20
Minimum
Common flow primary side*
21
Minimum
Common secondary flow
22
Minimum
Flow heating circuit 1*
23
Minimum
Secondary flow heating circuit 1
24
Minimum
Reduced room temperature setpoint heating circuit 1
25
Minimum
Flow heating circuit 2*
26
Minimum
Secondary flow heating circuit 2
27
Minimum
Reduced room temperature setpoint heating circuit 2
*
For suppressing hydraulic creep
** According to the setting made on operating line 56 (action of pulse input on the heating circuits)
Pulses
Radio clock receiver
