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Siemens Building Technologies
Basic Documentation RVP540 / RVP550
CE1P2488en
HVAC Products
Description of the heating engineer settings
18.10.2002
4.112 Minimum temperature of the wood-fired
boiler for release of the pump
•
Point of release for the pump of the wood-fired boiler can be defined
Setting range
Unit
Factory setting
20...80 °C
60
The pump of the wood-fired boiler will be released when the adjusted temperature is
reached. But the pump will be put into operation only when the measured temperature
is exceeded by the “Switching differential of the minimum boiler temperature for release
of the pump” (operating line 371) and the “Minimum temperature differential of the
wood-fired boiler” (operating line 369) is reached.
The graph below shows a possible progression of the temperature of the wood-fired
boiler (cold-start = boiler was not in operation before) and the relevant switching states
of the boiler pump (Q10):
Also refer to the graph on operating line 369.
[°C]
23
92
Z0
6
t [s]
ON
OFF
ON
OFF
Q10
t [s]
TV
TR
TV
Actual value B22 of temperature of the wood-fired boiler
TR
Return temperature B72
Q10
Pump of the wood-fired boiler
- - -
Variant TV
370
Minimum temperature of the wood-fired boiler for release of the pump
371
Switching differential of “Minimum temperature of wood-fired boiler for release of the pump”
0 Pump
overrun
time
385
Maximum duration of the residual heat function
If the pump was in operation before, it will be put into operation again if one of the fol-
lowing criteria is satisfied:
•
TV exceeds the sum of operating line 380
EXP
(minimum limitation of the return tem-
perature) and operating line 369 (minimum switching differential of the wood-fired
boiler) plus 4 K
•
The pump has not been in operation for at least 15 minutes, the boiler temperature
rises by at least 1 K / min and the minimum temperature differential of the wood-
fired boiler (operating line 369) is satisfied
Benefit
Setting
Effect
(cold start)
Effect
(warm start)