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Siemens Building Technologies
Basic Documentation RVP540 / RVP550
CE1P2488en
HVAC Products
Description of the EXP settings
18.10.2002
5.15.2 According to the boiler return temperature
Setting 1
Operation of the boiler bypass pump is according to the “Setpoint of minimum limitation
of the return temperature” (operating line 252), the “Switching differential of the bypass
pump” (operating line 283
EXP
), and the measured boiler return temperature (B7).
When the boiler return temperature reaches the adjusted “Setpoint of minimum limita-
tion of the return temperature” (operating line 252), the boiler bypass pump will be acti-
vated. This means that hot water will be fed from the flow directly to the return so that
the boiler return temperatures rises.
If the boiler return temperature acquired with sensor B7 exceeds the adjusted “Setpoint
of minimum limitation of the return temperature” (operating line 252) by more than one
“Switching differential of the bypass pump” (operating line 283
EXP
), the boiler bypass
pump will be deactivated.
In general:
Prerequisite:
Bypass pump
TKRx < TKRmin
ON
TKRx > SDBP
OFF (on completion of the pump overrun time)
B R
B P
P N
0
1
1
0
TK R x
t
t
t
10
20
30 m in
60
°C
50
40
30
m in
TKRmin
SDBP
23
73D
04
t
BR Burner
BP Bypass
pump
tPN Pump
overrun
time
TKRx
Actual boiler return temperature
TKRmin
Setpoint of minimum limitation of the return temperature (operating line 252
EXP
)
SDBP
Switching differential of the bypass pump (operating line 283
EXP
)
The impact on the consumers is identical with the impact described on operating line
259
EXP
.
Process
Reset
Example:
Effect
