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Lockout indication
12/20
Siemens Building Technologies
HVAC Products
a
b´
b
LOK16.140...
LOK16.250...
LOK16.650...
7785p02/0296
a-b
Startup sequence
b-b´
With some time variants:
«Idle steps» of the sequence switch up to the self-shutdown after burner
startup
(b´ = operating position of the sequence switch)
b(b´)-a
Postpurge sequence after controlled shutdown.
In start position «a», the sequence switch switches itself automatically off or
immediately initiates another burner startup (e.g. after a fault has been cor-
rected)
•
Duration of safety time with expanding flame burners
••
Duration of safety times with interrupted pilot burners
When lockout has occurred, the burner control can immediately be reset. After reset-
ting, and also after correction of a fault which resulted in a shutdown, or after a mains
failure, the sequence switch always runs to its start position, whereby only terminals 7,
9, 10 and 11 receive power in accordance with the control sequence.
It is only then that the burner control programs a burner restart.
Note: Do not press the lockout reset button for more than 10 seconds.
a
b´
b
LGK16.122...
LGK16.133...
a
b´
b
LGK16.335...
a
b
LGK16.322...
LGK16.333...
LGK16.622...
a
b
LGK16.635...
CC1N7785en
15.10.2003
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