20/56 CC1B7865E February 10, 2000 Landis & Staefa Division
5. Operating modes
In this case, a standard binary signal switches the second stage into circuit with analog
output «X1» on reaching the switch-on threshold «HYS1» and switches it out of circuit
at the lower switch-off threshold «HYS2».
q
A
B
q
A
(2)
(1)
W
HYS2
HYS1
HYS3
X1
0%
100%
7865w04/1099
)
The modulating controller must be available and configured in the unit
(optional).
Ö
Section 8.2 «C112 Limit comparator, controller type, setpoint «SP1», locking»
In the event of a sensor failure, the controller cannot monitor the actual value of the
boiler temperature (analog input 1). A safety shutdown is automatically carried out to
guard against overheating.
This also applies to the acquisition of the external setpoint at analog input 2.
−
Burner off
−
3-position output for closing the regulating unit
−
Self-setting is ended
−
Manual operation is ended
The setpoint is pre-selected with the buttons or the interface within pre-set limits.
It is possible to shift the setpoint, by either an analog or a binary signal, to influence it
according to the weather or to change it with an external contact.
5.2.4 Two-stage burner, modulating output
5.3 Safety shutdown
Functions
5.4 Pre-defined setpoint
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