165/218
Siemens Building Technologies
Basic Documentation RVA63.242, RVA53.242
CE1P2373E
Landis & Staefa Division
Description of OEM settings
26.03.2001
5.20 Control of the bypass pump
Reduction of flue gas condensation.
More efficient adherence to the boiler return temperature’s minimum limitation.
The boiler bypass pump improves the circulation of water through the boiler, thus
preventing the boiler temperature from falling below a certain level.
Setting range
Unit
Factory setting
0 / 1
Increment
0
For control of a boiler bypass pump, setting line 95 or 96 must be adapted first. Also
refer to "bypass pump" in Index.
The selection changes the operating mode of the boiler bypass pump.
Entry:
0
Parallel with the operation of the burner
The boiler bypass pump is switched on / off according to the burner’s on / off
signals.
1
According to the boiler return temperature
The boiler bypass pump is switched on / off according to the minimum limitation
of the boiler return temperature and the switching differential of the bypass
pump.
5.20.1 Parallel with the burner
Setting 0
Operation of the boiler bypass pump according to the burner’s on / off signal allows the
bypass pump to be operated with no need for using a boiler return sensor.
In that case, the additional setting lines 23
OEM
and 22
OEM
for the bypass pump are
deactivated.
Burner
Bypass pump
ON
ON
OFF
OFF (on completion of the pump overrun time)
0
1
1
0
t
2373D03
BR
BP
t
tPN
tPN
BR
Burner
BP
Bypass pump
tPN
Pump overrun time
Benefits
Description
Setting
Prerequisite
Effect
In general:
Example: