Protective Boiler Start-Up; Impact On 2-Position Loads - Siemens RVA63.242 User Manual

Benefits
Description
Setting
Effect
Process
156/218
Siemens Building Technologies
Landis & Staefa Division

5.9 Protective boiler start-up

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 start-up shortens the boiler's heating up time by restricting the heat
consumers. This means that the boiler passes the critical temperature range quicker,
thus minimizing flue gas condensation.
Setting range
0 / 1
The settings have the following meaning:
0 Protective boiler start-up is switched off
1 Protective boiler start-up is switched on
Protective boiler start-up is triggered via a locking signal generated by the temperature /
time integral.
Protective boiler start-up leads to switching on / off actions or setpoint reductions of the
heating circuits, depending on the type of heat consumer.

5.9.1 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
Locking signal > 0 %
Locking signal = 0 %
• Boiler pump
Note
A response to the locking signals is given only if control of the boiler pump is selected
"depending on temperature demand" (line 12 OEM = 0).
Status
Locking signal > 5 %
Locking signal < 5 %
• D.h.w. pump
Status
Locking signal < 50 %
Locking signal < 50 %
• System pump
Basic Documentation RVA63.242, RVA53.242
Description of OEM settings
Unit
–
Effect
Heating circuit pump OFF
Normal pump operation
Effect
Boiler pump ON
Normal pump operation
Effect
D.h.w. pump OFF
Normal pump operation
Factory setting
1
CE1P2373E
26.03.2001