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Siemens Building Technologies
Basic Documentation RVP540 / RVP550
CE1P2488en
HVAC Products
Description of the EXP settings
18.10.2002
5.10 Protective boiler startup
•
The required boiler temperature setpoint will be reached quicker
•
The condensation range will be passed quicker.
During the boiler's heating up time, undesirable flue gas condensation occurs on the
walls of the combustion chamber. The lower the boiler temperature, the more flue gas
condensation occurs.
Protective boiler startup shortens the boiler's heating up time by restricting the heat
consumers and / or by switching the boiler pump on / off. This means that the boiler
passes the critical temperature range quicker, thus minimizing flue gas condensation.
Setting range
Unit
Factory setting
0...3 –
1
The settings have the following meaning:
0
Protective boiler startup is switched off
1
Protective boiler startup with impact on the consumers and on the boiler
pump
2
Protective boiler startup with impact on the consumers.
3
Protective boiler startup with impact on the boiler pump.
Protective boiler start-up is triggered via a locking signal generated by the temperature /
time integral. Protective boiler startup leads to switching on / off actions or setpoint
reductions of the heating circuits, depending on the type of heat consumer.
5.10.1 Impact on 2-position loads
Due to the deactivation of the pumps, heat consumption will be reduced. This reduces
considerably the boiler water's heating up time.
•
Heating circuit pump:
Status Effect
Locking signal > 0 %
Heating circuit pump OFF
Locking signal = 0 %
Normal pump operation
•
D.h.w.
pump:
Status Effect
Locking signal > 50 %
D.h.w. pump OFF
Locking signal < 50 %
Normal pump operation
•
Boiler pump *
Status Effect
Locking signal > 5 %
Boiler pump ON
Locking signal < 5 %
Normal pump operation
*
When setting 1 was selected on operating line 261
EXP
, protective boiler startup has no impact on the
boiler pump.
Benefit
Description
Setting
Effect
Process
