Switching Differential Of The Bypass Pump (Sdbp) - Siemens SIGMAGYR RVP540 Basic Documentation

Benefit
Description
Setting
Effect
 Note
 Important
290/348
Siemens Building Technologies
HVAC Products
5.14 Switching differential of the bypass pump
(SDBP)
• The switching differential of bypass pump Q12 can be adjusted
The switching differential is a criterion for activating and deactivating the bypass pump.
Setting range
0...20
The setpoint used for the switching differential is the minimum limitation of the boiler
return temperature. If the boiler return temperature (TRx) falls below the setpoint, the
bypass pump will be activated. If the boiler return temperature exceeds the setpoint by
half the switching differential, the bypass pump will be deactivated again.
The frequency of switching on / off changes as follows:
Increase of SDBP:
Decrease of SDBP:
If the selected switching differential is too small, there is a risk of cycling.
The setting is active only when, on operating line 284
boiler return temperature) has been selected.
°C
TRx
ON
Q12
OFF
TRx Return temperature
Q12 Bypass pump
252 Setpoint of minimum limitation of the boiler return temperature
283

Switching differential of the bypass pump (SDBP)

EXP
Basic Documentation RVP540 / RVP550
Description of the EXP settings
Unit
K
the bypass pump runs less frequently, but for longer periods
of time. Return temperature variations are greater.
the bypass pump runs more frequently, but for shorter period
of time. Return temperature variations are smaller.
ON
Factory setting
6
, setting 1 (according to the
EXP
OFF
t
t
CE1P2488en
18.10.2002