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Benefit
Description
Setting
Adaption of output
Notes
LED
Effect
Multi-stage burner
BMU
Display
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Siemens Building Technologies
Landis & Staefa Division
3.4 Chimney sweep
At the touch of a button, the plant is ready for making flue gas measurements.
A function designed specifically for carrying out periodic flue gas measurements.
Activation:
The chimney sweep function is activated by pressing this button. It is
accessible only when the cover of the controller is open
Deactivation:
By pressing one of the operating mode or function buttons
By pressing again the chimney sweep button
Automatically after one hour
By selecting a number in the output test
During the time the chimney sweep function is activated, the heat output can be
increased or decreased by pressing the + / - buttons.
• With multi-stage burner:
The second burner stage can be switched on or off.
• When leaving the function, the controller will automatically return to the operating
mode previously selected
When the LED in the chimney sweep button is lit, the chimney sweep function is
active.
Multistage burner:
odulating burner
M
2 x 1 cascade:
BMU
The boiler's switching differential will not be taken into consideration. To ensure
continuous burner operation, the only switch-off point used is the boiler temperature's
maximum limitation (TKmax).
First, all connected loads will be locked to ensure the boiler temperature will reach the
setpoint of 64 °C as quickly as possible.
When the minimum temperature of 64 °C is attained, the available heating circuits are
switched on one by one, using a dummy load, to make sure the heat generated by the
boiler is drawn off so that the burner will remain in operation.
In the case of a BMU, the loads will immediately be released.
Basic Documentation RVA63.242, RVA53.242
Description of end-user settings
Burner stages 1 and 2 will be switched on
Maximum heat output
Both burners will be switched on
The chimney sweep button has no effect. But the forced
signals will be generated as described below if the chimney
sweep function on the BMU is activated
CE1P2373E
26.03.2001
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