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Setting
Important
Effect
Benefit
Description
Setting
Special displays
Benefit
Description
Setting
Note
Note
Resetting
136/348
Siemens Building Technologies
HVAC Products
Display
Zeile 280
... 95
EXP
Maintained boiler return temperature is only possible with oil- / gas-fired boiler partial
diagrams using a 3-port valve (OeG 3 and 4) or a bypass pump (OeG 5 and 6).
With partial diagrams OeG 1, 2, 7, 8 and 9, the maintained boiler return temperature is
only possible when restricting the consumers' demand for heat (operating line 281
If the return temperature drops below the adjusted value, hot flow water will be added
to the return – using the 3-port valve or the bypass pump in accordance with the partial
diagram – until the adjusted value will be reached again.
•
With the 3-port valve, this is accomplished by constantly adding the required
amount of water
•
With the partial diagrams with bypass pump, the maintained boiler return tem-
perature is ensured by switching the bypass pump on / off with a switching differ-
ential of 6 K (ON according to line 252, OFF according to line 252 + 6 K)
4.62 Actual value of return temperature B7
• Visualization of actual value of the return temperature
The return temperature (B7) currently acquired will automatically be displayed on this
operating line.
Display
-50...350
- - -
No value available
4.63 Burner hours run of stage 1 (K4 / PPS)
• Overview of the number of burner operating hours of burner stage 1
• Criterion for service and maintenance work
The display shows the total number of operating hours of burner stage 1 of a single- or
2-stage burner.
The number of operating hours of burner stage 1 are generated based on the signal
present at input K4 or the PPS signal.
Display
0...999'999
The average number of burner operating hours of stage 1 is obtained by making the
following calculation :
The number of burner hours run can also be acquired via input E1 (operating lines 880
and 877).
To reset the hours run meter to 0, press the + / - buttons simultaneously for 3 seconds.
Basic Documentation RVP540 / RVP550
Description of the heating engineer settings
Unit
°C
Unit
°C
Unit
h
burner
operating
hours
number
of
burner
starts
stage
Factory setting
8
stage
1
[h]
1
(line
258)
CE1P2488en
).
EXP
18.10.2002
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