291/348
Siemens Building Technologies
Basic Documentation RVP540 / RVP550
CE1P2488en
HVAC Products
Description of the EXP settings
18.10.2002
5.15 Control of the bypass pump
You can choose the criterion for controlling the bypass pump.
Setting range
Unit
Factory setting
0 / 1
–
0
The bypass pump can be controlled according to two different criteria:
0
Parallel with the burner
The bypass pump runs only when the burner is in operation. During the remaining
periods of time (where there is no more condensation), the bypass pump is deac-
tivated.
1
According to the boiler return temperature
The bypass pump will operate based on the “Switching differential of the bypass
pump” (operating line 283
EXP
), and the “Setpoint of minimum limitation of the return
temperature” (operating line 252).
5.15.1 Parallel with the burner
Setting 0
The bypass pump operates according to the burner's on / off signal.
The boiler return temperature has no direct impact on the operation of the bypass
pump.
In that case, the settings made on operating lines 252 and 283
EXP
have no meaning.
In general:
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
Description
Setting
Effect
Example:
