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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 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
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