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Building Technologies Division User Manual LMS14… CC1U7471en
6 The settings in detail 28.01.2015
6.27 Special operating modes
The unit offers a number of special operating modes that can be triggered via an
operator terminal. They are used primarily to make diagnostics or to support specific
measurements on the system.
Note!
If the unit has locked out, only manual control and the relay test (output test) can be
started. Due to lockout, the burner cannot be put into operation, but the outputs
(valves and pumps) can be driven to a predefined position as required for the
respective special operating modes.
The other special operating modes cannot be started during lockout. This means that
lockout forces the Chimney sweep and Controller stop functions to be aborted.
Line no. Operating line
7130 Chimney sweep function
Off
On
Off
Function is deactivated.
On
Function is activated.
The burner is started up. To ensure that operation of the burner is as steady as
possible, only maximum limitation of the boiler temperature is active as the switch-off
point.
Note!
The function is deactivated by setting -.- on this operating line, or automatically when
the maximum boiler temperature is reached.
Note!
In the case of a cascaded system, all other boilers are locked as soon as the
Chimney sweep function is started on one of the boilers.
Locking is canceled again when the Chimney sweep function is ended.
The Chimney sweep function is activated and deactivated via a button on the operator
unit or via menu item Maintenance/Diagnostics. The operator unit displays the
activated function in the form of a special mode symbol.
The Chimney sweep function generates the operating state required for making
emission measurements (flue gas measurements).
The switching thresholds are thus as follows:
Switch-off threshold:
Switch-off threshold boiler = 2212
Boiler temperature setpoint:
Boiler temperature setpoint = switch-off threshold boiler
Switch-on threshold:
Switch-on threshold boiler = boiler temperature setpoint – 2454
Chimney sweep
function
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