According To The Boiler Return Temperature Setting 1 - Siemens RVA63.242 User Manual

Process
Reset
Example:
166/218
Siemens Building Technologies
Landis & Staefa Division
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
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
pump (setting line 22 ), the boiler bypass pump will be deactivated.
OEM
In general:
Prerequisite:
TKRx < TKRmin
TKRx > TKRmin + SDBP
°C
6 0
50
4 0
3 0
10
B R
1
0
B P
1
0
BR Burner
BP Bypass pump
tPN Pump overrun time
TKRx Actual boiler return temperature
TKRmin Minimum limitation of boiler return temperature (setting line 22
SDBP Switching differential of bypass pump (setting line 23
Basic Documentation RVA63.242, RVA53.242
Description of OEM settings
) by more than one switching differential of the bypass
Bypass pump
ON
OFF (on completion of the pump overrun time)
T K R x
20 3 0 min
min
t P N
OEM
OEM
TKRmin+SDBP
TKRmin
t
t
t
)
OEM
)
CE1P2373E
26.03.2001
), the