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Benefit
Description
Setting
Effect
Limitation
Exception
138/348
Siemens Building Technologies
HVAC Products
Functions
4.67 Minimum limitation of the boiler temperature
(TKmin)
• Maintaining a predefined minimum boiler temperature
• Prevention of corrosion due to condensation in the case of noncondensing boilers
Minimum limitation of the boiler temperature is a protective function for the boiler. In
addition, minimum limitation of the setting range can be defined with setting 250
Setting range
TKmin
...Tkmax
EXP
Tkmin
Minimum limitation of the boiler temperature setpoint (setting on operating line 250
EXP
TKmax
Maximum limitation of the boiler temperature setpoint (setting on line 251
EXP
TV
max
akt
min
0
10
20
30
251
Actual value Tk of the boiler temperature
270
Minimum limitation Tkmin of the boiler temperature setpoint
250
Lowest minimum limitation Tkmin
EXP
251
Maximum limitation Tkmax
EXP
The setting ensures that the boiler temperature will not fall below the adjusted minimum
level TKmin. This prevents noncondensing boilers from being operated in the con-
densing range, thus reducing the risk of corrosion due to condensation.
The boiler temperature does not fall below Tkmin, even if the consumers called for a
lower temperature.
If, on operating line 257
EXP
porarily fall below Tkmin.
TK
°C
80
TK
70
60
50
40
TK
min
30
0
20
10
0
Basic Documentation RVP540 / RVP550
Description of the heating engineer settings
Unit
°C
40
50
60
of the boiler temperature setpoint
EXP
of the boiler temperature setpoint
EXP
, setting 2 is selected, the boiler temperature can also tem-
TK
max
w
-10
-20
°C
TA
Factory setting
40
EXP
)
EXP
70
80
90
100
Legend
TK
Boiler temperature
TKw
Boiler temperature setpoint
Tkmin
Minimum limitation of the boiler
temperature
TKmax
maximum limitation of the boiler
temperature
SDK
Switching differential
TAgem
Composite outside temperature
gem
.
EXP
)
°C
120
CE1P2488en
18.10.2002
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