Siemens RVA53.242 - 5.20.2 According to the boiler return temperature

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Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of OEM settings 26.03.2001
5.20.2 According to the boiler return temperature
Setting 1
By operating the boiler bypass pump according to the boiler return temperature’s
minimum limitation and the switching differential of the bypass pump, the boiler return
temperature can be maintained according to the return temperature acquired with
sensor B7.
When the boiler return temperature reaches the set minimum limitation (line 22
OEM
), the
boiler bypass pump will be activated. This means that hot water will be fed from the
flow directly to the return so that the boiler return temperatures rises.
When the boiler return temperature acquired with sensor B7 exceeds the set minimum
limitation (setting line 23
OEM
) by more than one switching differential of the bypass
pump (setting line 22
OEM
), the boiler bypass pump will be deactivated.
In general:
Prerequisite: Bypass pump
TKRx < TKRmin ON
TKRx > TKRmin + SDBP OFF (on completion of the pump overrun time)
BR
BP
PN
0
1
1
0
TKRx
t
t
t
10 20 30
min
60
°C
50
40
30
min
TKRmin
TKRmin+SDBP
2373D04
t
BR Burner
BP Bypass pump
tPN Pump overrun time
TKRx Actual boiler return temperature
TKRmin Minimum limitation of boiler return temperature (setting line 22
OEM
)
SDBP Switching differential of bypass pump (setting line 23
OEM
)
Process
Reset
Example: